TAPE WITH INTERLOCKING DEVICE

Info

Publication number: 20090300891
Type: Application
Filed: Feb 21, 2006
Publication Date: Dec 10, 2009
Inventors: Yoshinori Nanba (Chiba), Kenichi Tanaka (Chiba)
Application Number: 11/816,787

Abstract

A zipper-member-having tape 1 according to the present invention includes a pair of male tape 11 and female tape 12, the male tape 11 and the female tape 12 having zipper members 10 engageable with each other. The male tape and the like 11, 12 include a seal layer 111, 121 and a non-seal layer 112, 122, the non-seal layer 112, 122 being a portion excluding the seal layer 111, 121 and the zipper members 10. A first convex thread 115, 125 is provided on a surface of the seal layer 111, 121 of the male tape 11 and the female tape 12 while a second convex thread 116, 126 is provided on a surface of the non-seal layer 112, 122 of the male tape 11 and/or the female tape 12.

Description

Description

TECHNICAL FIELD

The present invention relates to a zipper-member-having tape for unsealing and resealing a bag, the tape being provided at an opening of the bag.

BACKGROUND OF THE INVENTION

As a packaging material for packaging various articles such as foods, pharmaceutical and medical products and groceries, there has been typically used a packaging bag that is openable and resealable by a zipper-member-having tape provided at an opening of the bag. The zipper member of the tape, which is belt-like shaped, includes a pair of a male member and a female member that are engaged with each other. As a typical method for manufacturing such a packaging bag as allows the opening of the bag to be opened and resealed, there is typically and widely used a method including making the zipper-member-having tape in advance and heat-sealing the zipper-member-having tape to a sealant layer of a base film forming a bag body.

In heat-sealing the zipper-member-having tape to the sealant layer of the base film, the zipper-member-having tape is generally double-layered in order to improve a heat-sealing speed. In this case, a melting point of a resin material forming a non-seal layer (on which the zipper member is provided) is generally set to be higher than that of a resin material forming a seal layer (a layer heat-sealed to the sealant layer of the base film). The zipper-member-having tape is manufactured by coextrusion. Although the tape is formed as a laminate body of different resins, an interlaminar intensity of a certain degree is obtainable without using any adhesives, and the degree of the intensity poses no practical disadvantage.

When the zipper-member-having tape is used as the tape, there is a sufficient interlaminar intensity applied between the seal layer and the non-seal layer that form the tape with the zipper member. However, when the zipper-member-having tape is heat-sealed with the base film, heat of heat-sealing by a seal-bar is applied to the tape via the base film, and a force for adhering non-compatible resins, which is applied on an interface between the seal layer and non-seal layer, is lost due to the heat of the heat-sealing. Accordingly, there has been a risk that the zipper-member-having tape may be detached from between the seal layer and the non-seal layer.

Further, there has been another problem that the non-seal layer of the male tape may be welded with that of the female tape due to the heat applied by the seal-bar in the above-described manner when heat-sealed, and there has been a demand for improvements.

In order to prevent the zipper-member-having tape and a bag-forming film from being distorted and to firmly heat-seal the both layers, it has been suggested to provide a plurality of ribs on the seal layer in a double-layered zipper-member-having tape (for example, see Patent Document 1).

[Patent Document 1] JP-A-2000-287718 (Claim 1, FIG. 4)

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

However, although the zipper-member-having tape disclosed in Patent Document 1 can prevent the tape and the bag-forming film from being distorted when heat-sealed, the zipper member-having tape can neither sufficiently prevent an interlaminar separation between the seal layer and the non-seal layer nor prevent the welding of the non-seal layers. Thus, the zipper-member-having tape is not practically applicable.

An object of the present invention is to firmly heat-seal a zipper-member-having tape that has a multi-layer of a seal layer and a non-seal layer with a sealant layer of a bag-forming base film, and to provide a zipper-member-having tape that can prevent an interlaminar separation of a multi-layered zipper-member-having tape formed from different resins (e.g., an interlaminar separation between the seal layer and the non-seal layer) and that can prevent the non-seal layers from being welded with each other.

Means for Solving the Problems

In order to achieve the object described above, a zipper-member-having tape according to a first aspect of the present invention is a zipper-member-having tape including: a pair of a male tape and a female tape, the male tape and the female tape having zipper members engageable with each other, in which the male tape and the female tape include a seal layer and a non-seal layer, the non-seal layer being a portion excluding the seal layer and the zipper members, a resin material forming the seal layer is substantially non-compatible with a resin material forming the non-seal layer, a plurality of convex threads are provided on a surface of the seal layer of the male tape and the female tape, and a plurality of convex threads are provided on a surface of the non-seal layer of the male tape and/or the female tape.

The zipper-member-having tape according to the aspect of the present invention is formed by the male tape and the female tape. The male tape and the female tape include the seal layer and the non-seal layer that is the portion excluding the seal layer and the zipper member, in which the non-seal layer is provided on a side on which the zipper member is provided. The plurality of convex threads (first convex thread) are formed on the surface of the seal layer of the male tape and the female tape while the plurality of convex threads (second convex thread) are formed on the surface of the non-seal layer of the male tape and/or the female tape.

Since the first convex thread formed on the surface of the seal layer is fused to be heat-sealed to the base film when a heated seal-bar applies heat to the tape via the base film in a heat-sealing operation, a sealing strength of the tape and the base film is maintained at a high level, and the heat and pressure applied to a concave portion between the convex threads (i.e., a portion excluding the first convex threads of the seal layer) are relaxed, such that a deformation and flexure of the zipper member and an interlaminar separation between the seal layer and the non-seal layer can be prevented to a certain degree.

The second convex thread formed on the non-seal layer surface laminated to the seal layer provides a desired space between the male tape and the female tape on the zipper member side even in the heat-sealing operation. Thus a contact area between the non-seal layer of the male tape and the female tape can be made smaller, such that the heat applied in the heat-sealing operation can be radiated (heat-radiating effect) and the heat and pressure applied to one of the zipper-member-having tape (i.e., one of the male tape and the female tape) can be prevented from transmitted to the other (the other of the male tape and the female tape) (heat-insulating effect), thereby preventing the male tape from being welded to the female tape in the heat-sealing operation.

In addition to the heat-radiating and heat-insulating effects by the second convex thread on the non-seal layer, the concave portion between the first convex threads on the seal layer relaxes the heat and pressure, such that the male tape and the female tape are prevented from being excessively heated, whereby the interlaminar separation between the seal layer and the non-seal layer during the heat-sealing operation can be prevented.

A zipper-member-having tape according to a second aspect of the present invention is a zipper-member-having tape including: a pair of a male tape and a female tape, the male tape and the female tape having zipper members engageable with each other, in which the male tape and the female tape include: a seal layer; and a non-seal layer formed of multiple layers, the non-seal layer being a portion excluding the seal layer and the zipper members, a resin material forming the seal layer is substantially non-compatible with a resin material forming the non-seal layer laminated to the seal layer, or at least a pair of resin materials adjacently laminated in the non-seal layer are substantially non-compatible with each other, a plurality of convex threads are provided on a surface of the seal layer of the male tape and the female tape, and a plurality of convex threads are provided on a surface of the non-seal layer of the male tape and/or the female tape.

The zipper-member-having tape according to the second aspect is provided by modifying the zipper-member-having tape according to the first aspect such that the non-seal layer is multi-layered. When the non-seal layer is multi-layered as described above, it is necessary to take into consideration not only the interlaminar separation between the seal layer and the non-seal layer when a resin material forming the seal layer is substantially non-compatible with that of the non-seal layer to be laminated to the seal layer but also an interlaminar separation within the non-seal layer when at least a pair of resin materials adjacently laminated in the non-seal layer are substantially non-compatible with each other.

As in the tape according to the first aspect, by forming the first convex thread on the surface of the seal layer, the deformation and flexure of the zipper member, the interlaminar separation between the seal layer and non-seal layer, or the interlaminar separation within the multi-layered non-seal layer can be prevented to a certain degree while the sealing strength of the tape and the base film is maintained at a high level.

In addition, the second convex thread formed on the non-seal layer surface laminated to the seal layer can radiate the heat applied in the heat-sealing operation (heat-radiating effect), and prevent the heat and pressure applied to one of the zipper-member-having tape from being transmitted to the other (heat-insulating effect), thereby preventing the male tape from being welded to the female tape in the heat-sealing operation.

In addition to the heat-radiating and heat-insulating effects by the second convex thread on the non-seal layer, the concave portion between the first convex threads on the seal layer relaxes the heat and pressure, such that the male tape and the female tape are prevented from being excessively heated, whereby the interlaminar separation between the seal layer and the non-seal layer or the interlaminar separation within the multiple-layered non-seal layer can be appropriately prevented.

Since the zipper-member-having tape according to the present invention can be heat-sealed to the sealant layer of the base film forming the bag and prevent the interlaminar separation between the seal layer and the non-seal layer during the heat-sealing operation (or the interlaminar separation within the multi-layered non-seal layer) and the welding of the non-seal layer, the zipper-member-having tape can exert the advantages to the maximum extent not only when being applied to a general flat bag such as a bag sealed along three edges but also when being applied to a bag product such as a side-gusset bag in which the tape cannot be conveyed in an MD direction of the base film and needs to be inserted in a TD direction of the base film without using a separator.

In the zipper-member-having tape according to the aspect of the present invention, it is preferable that the convex thread provided on the surface of the seal layer is substantially quadrangular in cross-section.

According to the aspect, since the convex thread (first convex thread) provided on the surface of the seal layer is substantially quadrangular in cross-section, a contact area between the first convex thread and the sealant layer of the base film, to which the tape is welded, can be appropriately enlarged and the sealing strength can be reinforced.

In the zipper-member-having tape according to the aspect of the present invention, it is preferable that a mounting width of the convex thread provided on the surface of the seal layer is 0.5 mm or more and a height of the convex thread is 0.08 mm or more, and a summation of a mounting area of the convex thread is 20 to 80% of a surface area of the seal layer.

Since the convex thread (first convex thread) formed on the surface of the seal layer has the mounting width of 0.5 mm or more and the height of 0.08 mm or more, the first convex thread can be fused to be welded to the sealant layer of the base film on a larger area when heat-sealed, whereby the sealing strength of the tape and the base film can be reliably enhanced.

In addition, since the summation of the mounting area of the first convex thread is 20 to 80% of the surface area of the seal layer, the zipper-member-having tape can contact the base film on an appropriately larger area when heat-sealed. Accordingly, the sealing strength of the tape and the base film to which the tape is sealed is enhanced and the proportion of the concave portion between the first convex threads becomes a desired value, thereby reliably preventing the interlaminar separation between the seal layer and the non-seal layer in the heat-sealing operation (or the interlaminar separation within the multi-layered non-seal layer).

In the zipper-member-having tape according to the aspect of the present invention, it is preferable that the convex thread provided on the surface of the non-seal layer is substantially triangular shaped in cross-section.

According to the aspect of the present invention, since the convex thread formed on the non-seal layer (second convex thread) is triangular in cross-section, the second convex thread can contact the non-seal layer facing the second convex thread on a smaller area, thereby efficiently preventing the welding of the second convex thread and the non-seal layer facing the second convex thread in the heat-sealing operation.

In the zipper-member-having tape according to the aspect of the present invention, it is preferable that a height of the convex thread provided on the surface of the non-seal layer is 0.03 mm or more.

According to the aspect of the present invention, since the height of the convex thread formed on the surface of the non-seal layer (second convex thread) is 0.03 mm or more, the heat and pressure applied to one of the zipper-member-having tapes (one of the male tape and female tape) is reliably prevented from being transmitted to the other tape (the other of the male tape and female tape), thereby efficiently preventing the interlaminar separation between the seal layer and the non-seal layer of the zipper-member-having tape in the heat-sealing operation (or the interlaminar separation within the multi-layered non-seal layer) and the welding of the non-seal layer provided on the pair of the zipper-member-having tape.

In addition, when a combination of the resin materials that are substantially non-compatible with each other is a combination of resin materials Whose sealing strength becomes 25 N/15 mm wide or less when both the resin materials are laminated in form of a film and heat-sealed to each other, the zipper-member-having tape according to the present invention is free from a problem such as the interlaminar separation described above, whereby a practically applicable zipper-member-having tape is provided. By appropriately selecting the resin materials that are on the above-described relationship with each other for the seal layer and non-seal layer, the seal layer and non-seal layer each may be arranged to have a different property and function. Accordingly, a wide variety of tape product designs becomes possible by selecting appropriate materials.

Note that the “heat-sealing” operation in the present invention is performed, for example, under the following conditions (i) to (iv) (in the description below, one of the resin materials is referred to as the “seal layer” while the other resin material is referred to as the “non-seal layer” for a convenience. When the non-seal layer is multi layered, the “seal layer” and the “non-seal layer” are respectively equivalent to the mutually non-compatible resin materials forming the non-seal layers.).

(i) Obtaining by a general method (a) a film using a resin material forming the seal layer (thickness: approximately 0.06 to 0.12 mm), (b) a film formed of the resin material forming the seal layer (thickness: approximately 0.01 to 0.04 mm), (c) a film formed of a resin material forming the non-seal layer (thickness: approximately 0.15 to 0.18 mm) and (d) a film using the resin material forming the non-seal layer (thickness: 0.04 to 0.10 mm), and laminating the films in this order.
(ii) Pressing the seal-bar to the laminated layers from (a) side, and sealing (a) to (b) by heat-sealing under the following conditions.

Sealing temperature: the melting point of the resin material forming the seal layer +10° C.

Sealing pressure: 0.2 Mpa

(iii) Pressing the seal-bar to the laminated layers from (c) side, and sealing (c) to (d) by heat-sealing under the following conditions.

Sealing temperature: 200° C. Sealing temperature: the melting point of the resin material forming the non-seal layer +10° C.

Sealing pressure: 0.2 Mpa

(iv) Measuring the sealing strength of (b) and (c) having been simultaneously sealed in accordance with the above described (ii) and (iii) (i.e., the sealing strength of the film formed of the resin material forming the seal layer and the film formed of the resin material forming the non-seal layer), and using the resin materials whose sealing strength becomes 25 N/15 mm wide or less. Incidentally, the measurement of the sealing strength may be performed using a commercially available autograph tensile testing machine under a measuring condition of 300 mm/min at 180° peeling.

When the combination of the resin materials that are substantially non-compatible with each other is a combination selected from a group consisting of a combination of linear low-density polyethylene using metallocene catalyst (metallocene LLDPE) and polypropylene (PP); a combination of ethylene-vinyl-acetate copolymer (EVA) and polypropylene (PP); and a combination of ethylene-vinyl-acetate copolymer (EVA) and high-density polyethylene (HDPE), the above-described advantages can be reliably obtained.

As one embodiment of the zipper-member-having tape according to the first and second aspects of the present invention, the plurality of convex threads provided on the surface of the non-seal layer of the male tape and/or the female tape are provided on a first side demarcated by the zipper member when the first side is seen from a width cross-section of the male tape and/or the female tape, and the non-seal layer of the male tape and the non-seal layer of the female tape on a second side forms a pseudo-adhesion structure, the second side being demarcated by the zipper member when the second side is seen from the width cross-section of the male tape and the female tape. The “pseudo-adhesion” is not particularly limited as long as the adhesive force thereof is so weak as to allow the pseudo-adhesion to be easily released by hands, and the adhesive force of the pseudo-adhesion is generally 5 to 20 N/15 mm.

With this arrangement, it is possible to prevent a mal-adhesion of the non-seal layers when the tape is heat-sealed to the film in a bag manufacturing operation. In addition, since the other side of the non-seal layer surface of the zipper-member-having tape, which faces a downstream side of a bag manufacturing line, forms the pseudo-adhesion structure during the heat-sealing operation, it is possible to prevent a bag product from being defected by a peeling of the zipper-member-having tape in the bag manufacturing operation, whereby the bag manufacturing efficiency is improved. A bag manufacturing operation in which the zipper-member-having tape is inserted from a direction perpendicular to a flow direction of the bag manufacturing line can be performed with a dramatically-improved efficiency as compared with an operation using a conventional zipper-member-having tape.

When the zipper-member-having tape is applied to a bag, it is preferable that the first side of the zipper-member-having tape adheres to a side adjacent to an opening of the bag while the second side of the zipper-member-having tape adheres to a side opposite to the side adjacent to the opening of the bag (i.e., a side adjacent to a non-opening of the bag, a side adjacent to a content). Since convex thread ribs are provided on the non-seal layer surface of the zipper-member-having tape facing the opening side of the bag, the bag is easily opened by hands. Although the non-seal layer of the zipper-member-having tape forms the pseudo-adhesion structure on the non-opening side of the bag (i.e., a content side), the adhesive force thereof is so weak as to allow the bag to be easily opened by hands and thus does not impair an openability of the bag.

BRIEF DESCRIPTION OF THE DRAWING(S)

FIG. 1 is a cross-sectional view showing a zipper-member-having tape according to an embodiment of the present invention;

FIG. 2 is a fragmentary enlarged view of FIG. 1;

FIG. 3 is a front view showing a male tape seen from a seal layer direction;

FIG. 4 is a front view showing a male tape seen from a non-seal layer direction; and

FIG. 5 is a cross-sectional view showing the zipper-member-having tape heat-sealed to a base film according to the present invention.

EXPLANATION OF CODES

1: zipper-member-having tape
10: zipper member
11: male tape
12: female tape
111, 121: seal layer
112, 122: non-seal layer
113: head
114: connector
123: first hook
124: second hook
115, 125: first convex thread
116, 126: second convex thread
40: base film
401: sealant layer
402: outer layer

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will be described below with reference to the attached drawings.

FIG. 1 is a cross-sectional view showing a zipper-member-having tape according to the present embodiment.

Codes in FIG. 1 respectively represent a zipper-member-having tape (1), a zipper member (10), a male tape (11), a female tape (12), a seal layer (111, 121), a non-seal layer (112, 122), a head (13), a connector (114), a first hook (123) and a second hook (124).

FIG. 1 is a cross-sectional view showing the zipper-member-having tape 1 in engagement, which is formed by the head 113 of the male tape 11, the first hook 123 and the second hook 124 of the female tape 12.

The zipper-member-having tape 1, whose cross-section is shown in FIG. 1, includes a pair of a male tape 11 and a female tape 12 formed of thermoplastic resins.

The male tape 11 includes: the seal layer 111 welded to an opening of a bag body (not shown); the non-seal layer 112 laminated to the seal layer 111 and provided on a side where the zipper member 10 is arranged; the head 113 substantially arrow-tip shaped in cross section; and the connector 114 for connecting the non-seal layer 112 and the head 113, all of which are integrally formed.

Similarly to the above-described male tape 11, the female tape 12 includes: a seal layer 121 welded to the opening of the bag body (not shown); the non-seal layer laminated to the seal layer 121; and the first hook 123 and the second hook 124 connected with the non-seal layer 122 and circular-arc shaped in cross section, the first hook 123 and the second hook 124 facing each other.

In the zipper-member-having tape 1, the head 113 and the connector 114 of the male tape 11 and the first hook 123 and the second hook 124 of the female tape 12 form the zipper member 10, and the bag is opened and resealed by engaging and disengaging these members.

In the present embodiment, the non-seal layer 112, the head 113 and the connector 114 of the male tape 11 are integrally formed from one material while the non-seal layer 122, the first hook 123 and the second hook 124 of the female tape 12 are integrally formed from another material.

Resin materials forming the seal layers 111, 121 and the non-seal layers 112, 122 are respectively selected from thermoplastic resins such that the resin materials are non-compatible with each other. The resin materials may be selected such that a melting point of the resin material forming the non-seal layers 112, 122 are higher than that of the resin material forming the seal layers 111, 121. When the melting point of the resin material forming the non-seal layers 112, 122 are not higher than that of the resin material forming the seal layers 111, 121, surfaces on the zipper member 10 side of the male tape 11 and the female tape 12 (surfaces of the non-seal layers 112, 122) may be welded with each other when heat-sealed, which is detrimental to heat-sealing and product yield.

On the other hand, when the difference between the melting points of the resin materials are large, a heat-sealing speed can be easily increased. Thus, it is preferable that the melting point of the resin material forming the non-seal layer 112, 122 is higher than that of the resin material forming the seal layer 111, 121 by 20° C. or more.

In this Description, “substantially non-compatible” not only means that the resin material forming the seal layer 111, 121 is non-compatible with the resin material forming the non-seal layer 112, 122 at all, but also means that the resin material forming the seal layer 111, 121 is slightly compatible with the resin material forming the non-seal layer 112, 122. The resin materials may be slightly compatible with each other, where, for example, the resin materials are a combination of resin materials whose sealing strength becomes 25 N/15 mm wide or less when both the resin materials are laminated in form of a film and heal sealed to each other under predetermined conditions (the above described conditions (i) to (iv)).

Combinations of such resin materials forming the seal layer 111, 121 and the non-seal layer 112, 122 (seal layer 111, 211/non-seal layer 112, 122) are exemplified as follows: a combination of linear low-density polyethylene using metallocene catalyst (metallocene LLDPE) and polypropylene (PP); a combination of ethylene-vinyl-acetate copolymer (EVA) and polypropylene (PP); and a combination of ethylene-vinyl-acetate copolymer (EVA) and high-density polyethylene (HDPE).

Incidentally, a melt flow rate (MFR) of the resin material forming the non-seal layer 112, 122 of the zipper-member-having tape 1 is preferably 3 to 10 g/10 minutes, more preferably 5 to 9 g/10 minutes. When the MFR of the resin material is less than 3 g/10 minutes, it may be difficult to extrude the head 113 (and the connector 114) as a component of the zipper member 10 of the male tape 11 and the first hook 123 and the second hook 124 as a component of the zipper member 10 of the female tape 12, both of which are integrally formed with the non-seal layers 112, 122. On the other hand, when the MFR of the resin material is more than 10 g/10 minutes, tip ends of the first hook 123 and the second hook 124 of the female tape 12 may be easily closed and the connector 114 of the male tape 11 may be easily tumbled, which makes it difficult to extrude the zipper member 10 into a predetermined reopenable and resealable shape.

According to the present invention, as shown in FIG. 1, a plurality of convex threads (first convex threads 115, 125) are provided along a longitudinal direction of the tape 1 on a surface of the seal layer 111, 121 (a surface that is heat-sealed to a sealant layer 401 of the base film 40 shown in FIG. 5, as will be described below). With this arrangement, the first convex thread 115, 125, which is provided on the surface of the seal layer 111, 121, is fused to be heat-sealed to the base film when the heated seal-bar applies heat to the tape 1 via the base film during the heat-sealing operation.

The seal-bar applies the heat and pressure to the first convex thread 115, 125 when heat-sealing the tape 1 to the sealant layer of the base film, and the heat and the pressure applied to a concave portion between the first convex threads 115, 125 on the seal layer 111, 121 are relaxed until the first convex thread 115, 125 is welded and leveled. Accordingly, while the sealing strength of the tape and the base film can be maintained to be high, an interlaminar separation between the seal layer 111, 121 and the non-seal layer 112, 122 and a deformation and flexure of the zipper member can be prevented.

The concave portion between the first convex threads 115, 125 relaxes the heat and pressure, such that the male tape 11 and the female tape 12 are prevented from being excessively heated and pressurized. The concave portion between the first convex threads 115, 125, as well as heat-radiating and heat-insulating effects of a below-described second convex thread 116, 126 provided on the non-seal layer 112, 122, can prevent the interlaminar separation between the seal layer 111, 121 and the non-seal layer 112, 122 in the heat-sealing operation.

In FIG. 1, the first convex thread 115, 125 is isosceles-trapezoid shaped in cross-section. The cross-sectional shape of the first convex thread 115, 125 provided on the surface of the seal layer 111, 121 may not be trapezoidal but may be substantially quadrangular such as rectangular and quadrate, whereby a contact area of the first convex thread 115, 125 with the sealant layer of the base film (see FIG. 5), to which the tape is welded, can be appropriately enlarged and the sealing strength can be reinforced.

The first convex thread 115, 125 may have any other cross-sectional shape and may be exemplarily formed to be substantially triangular and polygonal (e.g. pentagonal and semicircular).

On the other hand, a plurality of convex threads (the second convex thread 116, 126) are provided along the longitudinal direction of the tape 1 on a surface of the non-seal layer 112, 122 that is laminated to the seal layer 111, 121 (a surface on which the zipper member 10 is provided). The second convex thread 116, 126 provided on the surface of the non-seal layer 112, 122, provides an appropriate space between the male tape 11 and the zipper-member 10 side of the female tape 12 so as to prevent the non-seal layer 112 of the male tape 11 from contacting the non-seal layer 122 of the female tape 12 in the heat-sealing operation. In addition, the second convex thread 116, 126 can radiate the heat applied in the heat-sealing operation, thereby preventing the male tape 11 from being welded to the female tape 12 in the heat-sealing operation.

In FIG. 1, the second convex thread 116, 126 is triangular in cross-section. By making the second convex thread 116, 126 triangular, the contact area of the second convex thread 116, 126 with the non-seal layer 112, 122 facing the second convex thread 116, 126 can be made small, thereby efficiently preventing the welding of the non-seal layers 112, 122 facing each other in the heat-sealing operation.

The second convex thread 116, 126 may have any other cross-sectional shape and may be exemplarily substantially quadrangular (e.g. trapezoidal, rectangular and quadrate), polygonal (e.g. pentagonal) and semicircular in cross-section.

FIG. 2 is a fragmentary enlarged view of FIG. 1 (the male tape 11), FIG. 3 is a front view showing the male tape 1 seen from a seal-layer-111 direction, and FIG. 4 is a front view showing the male tape seen from a non-seal-layer-112 direction. Although FIGS. 2 to 4 exemplarily shows the male tape 11, the female tape 12 is similarly arranged in the present embodiment.

A height h₁of the first convex thread 115 formed on the seal layer 111 is preferably 0.08 mm or more (FIG. 2), and more preferably 0.1 to 0.3 mm or more. With the height h₁being 0.08 mm or more, the first convex thread 115 formed on the seal layer 111 can contact the sealant layer of the base film to which the tape is heat-sealed (see FIG. 5) on a larger area, whereby the sealing strength of the tape and the base film can be reliably enhanced.

A mounting width d of the first convex thread 115 (a surface contacting the seal layer surface on which the first convex thread 115 is mounted; hereinafter the same shall apply) is preferably 0.5 mm or more, and more preferably 0.7 to 2 mm. With the mounting width d being 0.5 mm or more, the first convex thread 115 can contact the sealant layer of the base film to which the tape is heat-sealed on a larger area, whereby the sealing strength of the tape and the base film can be enhanced.

According to the present invention, a proportion of the first convex thread 115 to the surface of the seal layer 111 may influence the sealing strength of the tape and the base film to which the tape is heat-sealed and on an effect to prevent the interlaminar separation between the seal layer 111 and the non-seal layer 112, the effect being entailed by heat-insulating performed by the concave portion between the first convex threads 115.

The proportion of the first convex portion 115 to the surface of the seal layer 111 is preferably such that a summation of the mounting area of the first convex threads 115 is 20 to 80% of the surface area of the seal layer 111, and more preferably such that the summation is 40 to 60% the surface area of the seal layer 111. With the summation of the mounting area of the first convex threads 115 being 20 to 80% of the surface area of the seal layer 111, the sealing strength of the tape and the base film to which the tape is heat-sealed is enhanced, and the interlaminar separation between the seal layer 111 and the non-seal layer 112 in the heat-sealing operation can be reliably prevented.

In contrast, when the proportion of the first convex thread 115 is less than 20%, a less portion of the first convex thread 115 is fused in the heat-sealing operation to be heat welded to the sealant layer of the base film, which may pose a risk that an enhancement of the sealing strength of the tape and the base film may be impaired. On the other hand, when the proportion of the first convex thread 115 exceeds 80%, the arrangement of the tape becomes substantially the same as an arrangement in which no first convex thread 115 is formed on the seal layer 111 and the tape thickness is increased. Thus, the heat and the pressure applied by the seal-bar to the tape is hardly relaxed, which may cause the interlaminar separation between the seal layer 111 and the non-seal layer 112.

In the present embodiment, the surface area of the seal layer 111 is obtained by multiplying a tape width shown in FIG. 3 by a length of the tape 1. The mounting area of the first convex thread 115 is obtained by multiplying the mounting width d of the first convex thread 115 shown in FIGS. 1 and 3 by the length of the tape 1.

A height h₂of the second convex thread 116 formed on the non-seal layer 112 is preferably 0.03 mm or more, and more preferably 0.05 mm or more. An upper limit of the height h₂of the second convex thread is preferably 0.3 mm. With the height h₂of the second convex thread 116 of the non-seal layer 112 being 0.03 mm or more, the heat and the pressure applied to one of the male tape 11 or the female tape 12 can be reliably prevented from being transmitted to the other. With this arrangement, it is possible to efficiently prevent the seal layer 111, 121 and the non-seal layer 121, 122 of the zipper-member-having tape 1 from being interlaminarly separated during the heat-sealing operation, and the pair of non-seal layers 112, 122 of the zipper-member-having tape 1 from being welded with each other.

A thickness t₁of the seal layer 111 (the portion excluding the first convex thread 115) is not particularly limited but may be 0.01 to 0.04 mm, and a thickness t₂of the non-seal layer 112 (the portion excluding the second convex thread 116) is not particularly limited but may be 0.1 to 0.2 mm.

As shown in FIGS. 1 and 3, the thickness sum t₁+t₂of the seal layer 111, 121 and the non-seal layer 112, 122, the height h₁, h₂respectively of the first convex thread 115, 125 formed on the seal layer 111, 121 and the second convex thread 116, 126 formed on the non-seal layer 112, 122, and a thickness T of the a portion of the zipper-member-having tape 1 at which the zipper member 10 is provided are preferably on a relationship represented by a formula (I) as shown below. When the relationship is not satisfied, either of the convex threads is so high as to cause a practical problem that the position of the zipper member 10 may not be easily conceived when the zipper-member-having tape is to be engaged by hands (incidentally, although FIG. 1 shows h₁, h₂and t₁+t₂with respect to the male tape 11, the same is true with respect to the female tape 12).

[Formula 1]

0.5TV≧2h₁+2(t₁+t₂)+h₂ (I)

Although FIG. 1 shows the first convex thread 115, 125 and the second convex thread 116, 126 according to the present invention in an exaggerated manner, the maximum thickness of the actual tape 1 can be usually found at the portion at which the zipper member 10 is provided.

The male tape 11 as a component of the zipper-member-having tape 1 has a cross-section as shown in FIG. 1. The male tape 11 is obtained by integrating the seal layer 111 on which the first convex thread is formed, the non-seal layer 112 on which the second convex thread is formed, and the head 112 and the connector 114 continuously formed from the non-seal layer 112 by a known coextrusion method. Likewise, the female tape 12 is obtained by integrating the seal layer 121 on which the first convex thread is formed, the non-seal layer 122 on which the second convex thread is formed and the first hook 123, and the second hook 124 continuously formed from the non-seal layer 122 by a known coextrusion method. When the zipper-member-having tape 1 is formed by such a coextrusion-forming method, the tape 1 can be manufactured in a simplified process at low cost. In addition the zipper-member-having tape 1 can be stably manufactured in a continuous manner.

The seal layer 111, 121 of the zipper-member-having tape 1 is welded to the base film 40 that forms a bag body (not shown), the base film 40 being transformed into a bag to obtain a package bag with the zipper-member-having tape 1.

FIG. 5 is a cross-sectional view showing the zipper-member-having tape 1 heat-sealed to the base film 40 according to the present invention. When the zipper-member-having tape 1 is heat-sealed to the base film 40, the first convex thread 115, 125 formed on the surface of the seal layer 111, 121 is fused to be welded to the sealant layer 401 of the base film 40.

Welding conditions (temperature, pressure, etc.) can be determined as desired in accordance with types of the resins used for the zipper-member-having tape 1 and the base film 40 for forming the bag body.

The arrangement of the bag body having an opening to which the zipper-member-having tape 1 according to the present invention is heat-sealed is not particularly limited but may include a known bag shape such as a bag sealed along four edges, a side-gusset bag and a bottom-gusset bag.

Particularly, the zipper-member-having tape 1 is preferably usable even when the zipper-member-having tape cannot be conveyed in a MD direction of the base film but needs to be inserted in a TD direction of the base film without using a separator in a bag product such as the side-gusset bag.

Although FIG. 5 shows a laminate film in which the sealant layer 401 is laminated over an outer layer 402 as the base film 40 for forming the bag body, a laminate film in which a middle layer (not shown) such as a gas barrier layer, a light-shielding layer and a strength-reinforcing layer is provided between the outer layer 402 and the sealant layer 401 may be used depending on a required performance. Incidentally, the outer layer 402, the middle layer (not shown) and the sealant layer 401 may be respectively formed of a single layer, or at least one of these layers may be formed of a plurality of layers.

The plurality of convex threads (first convex threads 115, 125), which are formed on the seal layers 111, 121 in the zipper-member-having tape 1 as described above, are fused to be heat-sealed to the base film 40 when applied with the heat by the heated seal-bar via the base film 40 in the heat-sealing operation. While the sealing strength of the tape 1 and the base film 40 is maintained at a high level, the concave portion between the first convex threads 111, 125 relaxes the heat and pressure, such that a deformation and flexure of the zipper member 10 is suppressed, thereby desirably preventing the interlaminar separation between the seal layer 111, 121 and the non-seal layer 112, 222. Further, the second convex threads 116, 126, which are provided on the surface of the non-seal layer 112, 122, provide an appropriate space between the male tape 11 and the zipper-member 10 side of the female tape 12 so as to prevent the non-seal layer 112 of the male tape 11 from contacting the non-seal layer 122 of the female tape 12 in the heat-sealing operation. In addition, the second convex thread 116, 126 can radiate the heat transmitted in the heat-sealing operation (heat-radiating effect) and can prevent the heat and pressure applied to one of the male tape 11 or the female tape 12 from being transmitted to the other (heat-insulating effect), thereby preferably preventing the male tape 11 from being welded to the female tape 12 in the heat-sealing operation.

The heat-radiating and heat-insulating effects of the second convex threads 116, 126 on the non-seal layer 112, 122, synergistically with the heat-radiating effect of the concave portion between the first convex threads 115, 125 on the seal layer 111, 121, prevent the male tape 11 and the female tape 12 from being excessively heated, thereby preventing the interlaminar separation between the seal layer 111, 121 and the non-seal layer 112, 122 in the heat-sealing operation.

The zipper-member-having tape 1 according to the present invention, as arranged in the above-described manner, is applicable to wide variety of products where the tape 1 is attached to an opening of a package bag for packaging various articles such as foods, pharmaceutical and medical products and groceries.

MODIFICATION OF EMBODIMENTS

It should be noted that the above-described embodiment merely shows an embodiment of the present invention, and the present invention is not limited to the above-described embodiment, where modifications and improvements are included within the scope of the present invention as long as an object and an advantage of the present invention can be achieved. In addition, specific arrangements and profiles when implementing the present invention may be altered as long as an object and an advantage of the present invention can be achieved.

For example, in above-described FIG. 1, ribs 116, 126 that are provided on a side of the non-seal layer surface at which the “T” representing the thickness of the zipper-member-having tape 1 is shown (“the other side” described in Claim 9) may be omitted (omission of total fourteen ribs), and a pseudo-adhesion layer may be provided to the other side end(s) of the male tape 11 and/or the female tape 12 of the zipper-member-having tape 1 so that the two layers are pseudo-adhered with each other.

For example, when the non-seal layer of the male tape is of polypropylene, a layer of low-density polyethylene and a composition of polypropylene and polyethylene (polyethylene-rich) may be provided to the non-seal layer surface of the female tape.

On the other hand, when the non-seal layer of the male tape is of high-density polyethylene, a layer of polypropylene and a composition of polypropylene and polyethylene (polypropylene-rich) may be provided to the non-seal layer surface of the female tape.

Such a zipper-member-having tape 1 is attached to the bag such that the side at which the “T” representing the thickness of the zipper-member-having tape 1 (“the other side” described in Claim 9) faces a non-opening side of the bag (a content side). Since the convex thread ribs 116, 126 are provided on the non-seal layer surface of the zipper-member-having tape 1 facing the opening side of the bag, the bag is easily opened by hands. Although the non-seal layers of the zipper-member-having tape 1 are pseudo-adhered with each other on the non-opening side (i.e., the content side) of the bag, the adhesive force is so weak as to allow the bag to be easily opened by hands thus does not impair an openability of the bag.

Although the non-seal layer 112, 122 of the male tape 11 and the female tape 12 is a single layer, with which the zipper member 10 is integrally formed in the above-described embodiment, the non-seal layer 112, 122 may be formed of multiple layers, in which the zipper member 10 is provided on the innermost layer of the multiple layers of the non-seal layer 112, 122.

Although the second convex thread 116, 126 is formed on the non-seal layer of 112, 122 of the male tape 11 and the female tape 12 in the above-described embodiment, the second convex thread 116, 126 may be provided on either of the male tape 11 or the female tape 12.

Although six of the first convex threads 115, 125 are provided on each of the content side (upper side in FIG. 1. the same is true hereinafter.) and the opening side (lower side in FIG. 1. the same is true hereinafter) of the seal layer 111, 121 (total twelve threads) while seven of the second convex thread 116, 126 are provided on each of the content side and the opening side of the non-seal layer 121, 122 (total fourteen threads) in the above embodiment, the present invention is not limited thereto, but the number of the first convex thread 115, 125 and the second convex thread 116, 126 may be determined as desired.

In the zipper-member-having tape 1 in the above-described embodiment, the components of the zipper member 10, i.e., the head 113 having a substantially arrow-tipped shape of the male tape 11 and the first and second hooks 123, 124 each having a substantially arc shape of the female member 12, are engaged with and disengaged from each other to unseal and reseal the bag. However, the shape of the zipper member 10 is not limited to the one as in the above-described embodiment but may be any shape as long as the zipper member 10 can perform unsealing and resealing. The shape and the number of the heads 113 and the first and second hooks 123, 124 may be arbitrarily determined.

Although the seal layer 111, 121, the first convex thread 115, 125 formed on the seal layer 111, 121, the non-seal layer 112, 122 and the second convex thread 116, 126 formed on the non-seal layer 112, 122 are preferably integrally formed of the same resin material, the seal layer 111, 121 and the non-seal layer 112, 122 may be formed of a resin material different from that of the first convex thread 115, 125 and the second convex thread 116, 126 respectively as long as an object and an effect of the present invention is not impaired.

Although the non-seal layer 112, 122 is laminated over the seal layer 111, 121 to be integrated with the zipper member 10 in FIG. 1, the zipper member 10 (including the connecter 114 of the male tape 11) and the seal layer 111, 121, for example, may be separately formed to be integrally adhered with each other using an adhesive and the like. In addition, a middle layer (not shown) with which the zipper member is integrally formed may be provided between the seal layer 111, 121 and the non-seal layer 112, 122 to be laminated to the non-seal layer 112, 122.

Although the non-seal layer 112, 122 is single-layered and the resin material forming the seal layer 111, 121 is substantially non-compatible with that of the non-seal layer 112, 122 in the above-described embodiment, the non-seal layer may be multiple-layered. In this case, not only when the resin material forming the seal layer is substantially non-compatible with that of the non-seal layer 112, 122 laminated to the seal layer but also when at least a pair of layers adjacently laminated in the non-seal layer are substantially non-compatible with each other, effects of the present invention can be obtained.

Specifically, with the first convex thread being formed on the surface of the seal layer (the resin material forming the seal layer) as in the above-described embodiment, the sealing strength of the tape and the base film is maintained at a high level and the heat and the pressure applied to the concave portion between the convex threads (portion of the seal layer other than the convex thread) is relaxed. Accordingly, it is possible to desirably prevent the deformation and flexure of the zipper member, the interlaminar separation between the seal layer and the non-seal layer, and an interlaminar separation inside the multiple-layered non-seal layer. With the second convex thread being formed on the non-seal layer surface laminated to the seal layer, the contact area between the non-seal layers of the male tape and the female tape can be reduced, such that the heat applied in the heat-sealing operation can be radiated (heat-radiating effect) and the heat and the pressure applied to one of the male tape and the female tape can be prevented from being transmitted to the other (heat-insulating effect), thereby preventing the male tape from being welded to the female tape in the heat-sealing operation.

Also as in the above-described embodiment, the heat-radiating and heat-insulating effects by the second convex thread on the non-seal layer, as well as the relaxation of the heat and pressure by the concave portion between the first convex threads on the seal layer, can prevent the male tape and the female tape from being excessively heated, whereby the interlaminar separation between the seal layer and the non-seal layer or the interlaminar separation in the multiple-layered non-seal layer can be prevented as desired.

The specific arrangement, the profile and the like described in the embodiment of the present invention can be altered as long as an object of the present invention can be attained.

Example

Now, the present invention will more specifically be described below by providing examples and comparisons, the content of which by no means limits the scope of the present invention.

In the examples and the like described below, resin properties were measured with the melt flow rate (MFR) being based on JIS K7210 (21.1 N load at 230° C.) and a melting point being based on JIS K7121.

Example 1

With respect to the zipper-member-having tape as shown in FIG. 1, materials forming the seal layer and the non-seal layer (including the zipper member) were coextruded using a commercially available extrusion-molding machine in a manner described below, such that twelve convex threads of an isosceles-trapezoid shape with a height of 0.1 mm (first convex thread) were provided on the seal layers (thickness: 0.02 mm) of the male tape and the female tape respectively and fourteen equilateral-triangular convex threads with a height of 0.06 mm and a mounting width per thread of 0.15 mm were provided on the non-seal layers (thickness: 0.16 μm) of the male tape and the female tape respectively. By this method, the zipper-member-having tape according to the present invention was obtained.

The summation of the mounting width of the first convex threads was 5 mm and the mounting area of the first convex threads was 30% of the surface area of the seal layer. In addition, the thickness T of the zipper-member-having tape 1 at the portion where the zipper member was provided shown in FIG. 1 was 1.5 mm.

(Material: Seal Layer)

Linear low-density polyethylene using metallocene catalyst was used (7P12A: Manufactured by Tosoh Corporation, MFR: 12 g/10 minute, Melting Point: 93° C., Density: 900 kg/cm³).

(Material: Non-Seal Layer)

Random polypropylene was used (F-744NP: Manufactured by Idemitsu Kosan Co., Ltd., MFR: 7 g/10 minute, Melting Point: 133° C., Density: 900 kg/cm³).

Example 2

In the zipper-member-having tape obtained by the method described in the example 1, the shape of the first convex thread formed on the seal layer was modified to a triangle with a height of 0.1 mm from the isosceles-trapezoid shape with the height of 0.1 mm. Except for the modification, a zipper-member-having tape was obtained by the same method as in the example 1.

[Comparison 1]

In the zipper-member-having tape obtained by the method described in the example 1, the shape of the first convex thread formed on the seal layer was modified to a triangle with a height of 0.1 mm from the isosceles-trapezoid shape with the height of 0.1 mm, and no second convex thread was formed on the non-seal layer. Except for these modifications, a zipper-member-having tape was obtained by the same method as in the example 1.

[Comparison 2]

In the zipper-member-having tape obtained by the method shown in the example 1, no first convex thread was formed on the seal layer. Except for the modification, a zipper-member-having tape was obtained by the same method as in the example 1.

[Comparison 3]

In the zipper-member-having tape obtained by the method described in the example 1, the shape of the first convex thread formed on the seal layer was modified to a triangle with a height of 0.06 mm from the isosceles-trapezoid shape with the height of 0.1 mm, and no second convex thread was formed on the non-seal layer. Except for these modifications, a zipper-member-having tape was obtained by the same method as in the example 1.

[Comparison 4]

In the zipper-member-having tape obtained by the method shown in the example 1, no convex thread was formed on either of the seal layer and the non-seal layer. Except for the modification, a zipper-member-having tape was obtained by the same method as in the example 1.

[Examination 1]

The zipper-member-having tapes obtained in Examples 1, 2 and Comparative Examples 1 to 4 were heat-sealed three times to a linear low-density polyethylene side of the base film arranged as below (by touching the seal-bar to the tape two times from the male tape side and one time from the female tape side) under the following sealing conditions of sealing pressure of 2 kg/cm²; sealing temperature of 150° C.; and sealing time of 1 second, set by a commercially available heat-sealing tester, whereby a gusset bag was obtained.

After being heat-sealed in this manner, the sealing strength of the zipper-member-having tape and the base film, the welding of the non-seal layers of the zipper-member-having tape and the interlaminar separation between the seal layer and non-seal layer were checked, compared and evaluated. The results are shown in Table 1 together with the arrangements of Examples 1, 2 and Comparative Examples 1 to 4.

Measurement of the sealing strength was performed in the following manner.

(Arrangement of Base Film)

Multi-layered film (total thickness: 85 μm) of Nylon film (Ny) (thickness: 15 μm) and linear low density polyethylene (LLDPE) (thickness: 70 μm) was used as the base film.

(Evaluation of Sealing Strength)

The base film and the zipper-member-having tape heat-sealed to each other were cut into a piece with 15 mm wide to obtain a test sample, and the test sample was measured with an autograph tensile testing machine under a measuring condition of 300 mm/min at 180° peeling. In addition, the evaluation was conducted in accordance with the following evaluation criteria.

(Evaluation Criteria)

Evaluation Contents Excellent: Sealing Strength of 30 N/15 mm wide or more. Good: Sealing Strength of 25 N/15 mm wide or more, less than 30 N/15 mm wide. Not Good: Sealing Strength of less than 25 N/15 mm wide.

TABLE 1 (Result) [Example 1] [Example 2] [Comparison 1] [Comparison 2] [Comparison 3] [Comparison 4] Convex Shape Isosceles- Triangle Triangle none Triangle none Threads of Trapezoid Seal Layer Height (mm) 0.1 0.1 0.1 0.06 (First Summation of 5 5 5 5 Convex Mounting Thread) width (mm) Proportion of 30 30 30 30 Summation of Mounting Area (%) Convex Shape Triangle Triangle None Triangle None None Threads of Height (mm) 0.06 0.06 0.06 Non-Seal Mounting 0.15 0.15 0.15 Layer Width (mm) (Second (Per Thread) Convex Thread) Evaluation Sealing Excellent: Good: Good: Not Good: Good: Not Good: Result Strength Welding Not Observed Not Observed Observed Not Observed Observed Observed Interlaminar Not Observed Not Observed Observed Observed Observed Observed Separation

As is understood from the results shown in Table 1, the zipper-member-having tape according to the present invention obtained in Examples 1 and 2 was sealed to the base film with a high sealing strength, where neither welding of the non-seal layers during the heat-sealing operation nor interlaminar separation between the seal layer and non-seal layer was caused in the zipper-member-having tape.

As compared with Example 2 in which the shape of the first convex thread was equilateral-triangular in cross-section, the tape was sealed to the base film with a higher sealing strength in Example 1 in which the shape of the first convex thread was isosceles-trapezoid in cross-section.

On the other hand, in Comparative Examples 1 and 3 in which the tape in Example 1 was modified such that the shape of the first convex thread was triangular in cross-section while no second convex thread was provided on the non-seal layer, the tape was sealed to the base film with a less seal strength as compared with Example 1, and the welding of the non-seal layers during the heat-sealing operation and the interlaminar separation between the seal layer and non-seal layer were observed.

In Comparative Example 2 in which the tape in Example 1 was modified such that no first convex thread was provided on the seal layer, the tape was sealed to the base film with a much less seal strength as compared with Example 1, and although the welding of the non-seal layers during the heat-sealing operation was not confirmed, the interlaminar separation between the seal layer and non-seal layer was observed.

In Comparative Example 4 in which the tape in Example 1 was modified such that no convex thread was provided on either the seal layer or the non-seal layer, the tape was sealed to the base film with a much less seal strength as compared with Example 1, and the welding of the non-seal layers during the heat-sealing operation and the interlaminar separation between the seal layer and non-seal layer were observed.

INDUSTRIAL APPLICABILITY

The present invention is applicable to a wide variety of zipper-member-having tapes that are heat-sealed to an opening of the package bag that packages various articles such as foods, pharmaceutical and medical products and groceries in an openable and resealable manner.

Claims

1. A zipper-member-having tape, comprising:

a pair of a male tape and a female tape, the male tape and the female tape having zipper members engageable with each other, wherein

the male tape and the female tape include a seal layer and a non-seal layer, the non-seal layer being a portion excluding the seal layer and the zipper members,

a resin material forming the seal layer is substantially non-compatible with a resin material forming the non-seal layer,

a plurality of convex threads are provided on a surface of the seal layer of the male tape and the female tape, and

a plurality of convex threads are provided on a surface of the non-seal layer of the male tape and/or the female tape.

2. A zipper-member-having tape, comprising:

a pair of a male tape and a female tape, the male tape and the female tape having zipper members engageable with each other, wherein

the male tape and the female tape include: a seal layer; and a non-seal layer formed of multiple layers, the non-seal layer being a portion excluding the seal layer and the zipper members,

a resin material forming the seal layer is substantially non-compatible with a resin material forming the non-seal layer laminated to the seal layer, or at least a pair of resin materials adjacently laminated in the non-seal layer are substantially non-compatible with each other,

a plurality of convex threads are provided on a surface of the seal layer of the male tape and the female tape, and

a plurality of convex threads are provided on a surface of the non-seal layer of the male tape and/or the female tape.

3. The zipper-member-having tape according to claim 1, wherein the convex thread provided on the surface of the seal layer is substantially quadrangular in cross-section.

4. The zipper-member-having tape according to claim 1, wherein a mounting width of the convex thread provided on the surface of the seal layer is 0.5 mm or more and a height of the convex thread is 0.08 mm or more, and a summation of a mounting area of the convex thread is 20 to 80% of a surface area of the seal layer.

5. The zipper-member-having tape according to claim 1, wherein the convex thread provided on the surface of the non-seal layer is substantially triangular shaped in cross-section.

6. The zipper-member-having tape according to claim 1, wherein a height of the convex thread provided on the surface of the non-seal layer is 0.03 mm or more.

7. The zipper-member-having tape according to claim 1, wherein a combination of the resin materials that are substantially non-compatible with each other is a combination of resin materials whose sealing strength becomes 25 N/15 mm wide or less when both the resin materials are laminated in form of a film and heat-sealed to each other.

8. The zipper-member-having tape according to claim 7, wherein the combination of the resin materials that are substantially non-compatible with each other is a combination selected from a group consisting of a combination of linear low-density polyethylene using metallocene catalyst (metallocene LLDPE) and polypropylene (PP); a combination of ethylene-vinyl-acetate copolymer (EVA) and polypropylene (PP); and a combination of ethylene-vinyl-acetate copolymer (EVA) and high-density polyethylene (HDPE).

9. The zipper-member-having tape according to claim 1, wherein

the plurality of convex threads provided on the surface of the non-seal layer of the male tape and/or the female tape are provided on a first side demarcated by the zipper member when the first side is seen from a width cross-section of the male tape and/or the female tape, and

the non-seal layer of the male tape and the non-seal layer of the female tape on a second side forms a pseudo-adhesion structure, the second side being demarcated by the zipper member when the second side is seen from the width cross-section of the male tape and the female tape.

10. A zipper-member-having bag, comprising

a zipper-member-having tape including a pair of a male tape and a female tape, the male tape and the female tape having zipper members engageable with each other, wherein

the male tape and the female tape include a seal layer and a non-seal layer, the non-seal layer being a portion excluding the seal layer and the zipper members,

a resin material forming the seal layer is substantially non-compatible with a resin material forming the non-seal layer,

a plurality of convex threads are provided on a surface of the seal layer of the male tape and the female tape,

a plurality of convex threads are provided on a surface of the non-seal layer of the male tape and/or the female tape,

the plurality of convex threads provided on the surface of the non-seal layer of the male tape and/or the female tape are provided on a first side demarcated by the zipper member when the first side is seen from a width cross-section of the male tape and/or the female tape,

the non-seal layer of the male tape and the non-seal layer of the female tape on a second side forms a pseudo-adhesion structure, the second side being demarcated by the zipper member when the second side is seen from the width cross-section of the male tape and the female tape, and

the first side of the zipper-member-having tape adheres to a side adjacent to an opening of the bag while the second side of the zipper-member-having tape adheres to a side opposite to the side adjacent to the opening of the bag.

11. The zipper-member-having tape according to claim 2, wherein the convex thread provided on the surface of the seal layer is substantially quadrangular in cross-section.

12. The zipper-member-having tape according to claim 2, wherein a mounting width of the convex thread provided on the surface of the seal layer is 0.5 mm or more and a height of the convex thread is 0.08 mm or more, and a summation of a mounting area of the convex thread is 20 to 80% of a surface area of the seal layer.

13. The zipper-member-having tape according to claim 2, wherein the convex thread provided on the surface of the non-seal layer is substantially triangular shaped in cross-section.

14. The zipper-member-having tape according to claim 2, wherein a height of the convex thread provided on the surface of the non-seal layer is 0.03 mm or more.

15. The zipper-member-having tape according to claim 2, wherein a combination of the resin materials that are substantially non-compatible with each other is a combination of resin materials whose sealing strength becomes 25 N/15 mm wide or less when both the resin materials are laminated in form of a film and heat-sealed to each other.

16. The zipper-member-having tape according to claim 15, wherein the combination of the resin materials that are substantially non-compatible with each other is a combination selected from a group consisting of a combination of linear low-density polyethylene using metallocene catalyst (metallocene LLDPE) and polypropylene (PP); a combination of ethylene-vinyl-acetate copolymer (EVA) and polypropylene (PP); and a combination of ethylene-vinyl-acetate copolymer (EVA) and high-density polyethylene (HDPE).

17. The zipper-member-having tape according to claim 2, wherein