CLEANING WET WIPE

- DAIO PAPER CORPORATION

A cleaning wet wipe includes, embossment blocks, in each of which a plurality of convex embossments that are embossments having convexity are gathered, in a first surface of the cleaning wet wipe. The plurality of embossment blocks are continuously arranged and form embossment block rows from a first side to a second side opposite to the first side. Non-embossment parts are included between other ones of the embossment blocks which are adjacent. The plurality of embossment block rows are continuously arranged from a third side to a fourth side. The non-embossment parts are provided at a proportion of not less than 25% and not more than 50% with respect to an area of the cleaning wet wipe. The convex embossments are arranged such that at least one convex embossment is present on a straight line extended perpendicularly from an arbitrary point on the third side to the fourth side.

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Description
TECHNICAL FIELD

The present invention relates to a cleaning wet wipe.

BACKGROUND

In the related art, it is known that dirt wiping-off properties, operability, visibility of dirt on a cleaning wet wipe, and the like are improved by embossing a cleaning surface of the wipe to cause it to have convexities (see Patent Document 1, for example).

PATENT LITERATURE

  • Patent Document 1: JP 2018-064723 A

SUMMARY

However, since the convexities are arranged in series with directions thereof on the paper (for example, directions of long axis directions) aligned in the cleaning wet wipe as described in Patent Document 1, parts where wiping is not performed by the convexities (so-called “wiping streaks”) may occur on a surface to be cleaned. A user who has recognized the wiping streaks may determine that a chemical agent has run out and started to dry and discard the wipe even though the chemical agent still remains in the wipe, and the user may use unnecessarily many wipes.

An object of the present invention is to provide a cleaning wet wipe capable of reducing occurrence of wiping streaks when wiping cleaning is performed with the cleaning wet wipe attached to a cleaning tool having a head.

The invention according to aspect 1 is a cleaning wet wipe that is obtained by impregnating a base paper sheet with a chemical agent and is used with the cleaning wet wipe attached to a cleaning tool having a head, the cleaning wet wipe including:

    • embossment blocks, in each of which a plurality of convex embossments that are embossments having convexity are gathered, in a first surface of the cleaning wet wipe,
    • in which the plurality of embossment blocks are continuously arranged and form embossment block rows from a first side to a second side opposite to the first side,
    • non-embossment parts where the embossments are not arranged are included between other ones of the embossment blocks which are adjacent,
    • the plurality of embossment block rows are continuously arranged from a third side perpendicularly intersecting the first side to a fourth side opposite to the third side,
    • the non-embossment parts are provided at a proportion of not less than 25% and not more than 50% with respect to an area of the cleaning wet wipe, and
    • the convex embossments are arranged such that at least one convex embossment is present on a straight line extended perpendicularly from an arbitrary point on the third side to the fourth side.

The invention according to aspect 2 is the cleaning wet wipe according to aspect 1 including:

    • concave embossments that are embossments having convexity in a second surface of the cleaning wet wipe,
    • in which the embossment blocks are combinations of the plurality of convex embossments and the concave embossments, and
    • the concave embossments are arranged such that at least one concave embossment is present on a line extended from an arbitrary point on the third side to the fourth side.

The invention according to aspect 3 is the cleaning wet wipe according to aspect 1 or 2, in which

    • the base paper sheet includes hydrophobic fiber layers that form surfaces of the sheet, and
    • a hydrophilic fiber layer that is sandwiched between the hydrophobic fiber layers, and
    • mutual fibers are entangled in boundary regions between the hydrophobic fiber layers and the hydrophilic fiber layer.

The invention according to aspect 4 is the cleaning wet wipe according to any one of aspects 1 to 3, in which

    • an angle formed between a long axis direction of the embossments and a first direction that perpendicularly intersects the first side is not less than 30° and not more than 60°, and
    • the embossment blocks have diamond shapes.

The invention according to aspect 5 is the cleaning wet wipe according to any one of aspects 1 to 4, wherein

    • the embossments have oval shapes and have narrowed parts at substantially centers thereof in the long axis direction.

According to the present invention, it is possible to provide a cleaning wet wipe capable of reducing occurrence of wiping streaks when wiping cleaning is performed with the cleaning wet wipe attached to a cleaning tool having a head.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 This is a perspective view of a cleaning tool with a cleaning wet wipe according to a present embodiment attached thereto.

FIG. 2 This is a plan view illustrating the cleaning wet wipe according to the present embodiment.

FIG. 3 This is a sectional view of the III-III part in FIG. 2.

FIG. 4 This is a plan view illustrating a cleaning wet wipe according to a modification example.

FIG. 5A This is a plan view illustrating an embossment pattern according to an example.

FIG. 5B This is a plan view illustrating an embossment pattern according to an example.

FIG. 5C This is a plan view illustrating an embossment pattern according to a comparative example.

FIG. 5D This is a plan view illustrating an embossment pattern according to a comparative example.

 DETAILED DESCRIPTION

Hereinafter, a cleaning wet wipe 100 that is an embodiment of the present invention will be described with reference to the drawings. However, the scope of the present invention is not limited to the illustrated examples and should be determined on the basis only of the description of the claims.

Note that the following description will be given by defining an X direction, a Y direction, and a Z direction as illustrated in FIG. 1. Also, “to” is used as having a meaning including numerical values described before and after it as a lower limit value and an upper limit value in this specification.

Configuration of Embodiment

FIG. 1 is a diagram illustrating a state of the cleaning wet wipe 100 according to the present embodiment when it is used.

As illustrated in FIG. 1, the cleaning wet wipe 100 is a sheet obtained by impregnating a base paper sheet obtained by performing ply processing (stacking) on a plurality of fiber assembly base materials with a chemical agent. Also, the cleaning wet wipe 100 is used for floor cleaning by being exchangeably attached to a cleaning tool 200 including a head 201 with a rectangular flat plate shape and a handle 202 attached to an upper surface of the head 201.

The cleaning wet wipe 100 as illustrated in FIG. 2 covers a bottom surface of the head 201 of the cleaning tool 200 to form a cleaning surface, is bent at fold lines S along longitudinal edges 201a of the head 201 of the cleaning tool 200, is locked at the upper surface of the head 201, and is thereby brought into an attached state.

Note that the longitudinal edges 201a indicate edges of the head 201 in the longitudinal direction. In other words, the longitudinal edges 201a indicate two long edges from among the four edges of the rectangular head 201.

The fiber assembly base material is a non-woven fabric manufactured by joining predetermined fibers by a known technology such as spun lace, air-through, air-laid, point bond, spun bond, or needle punch.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2.

As illustrated in FIG. 3, the cleaning wet wipe 100 has, for example, a three-layer structure, surface layers on both sides are hydrophobic fiber layers 11, 11 made mainly of hydrophobic fibers, and an intermediate layer is a hydrophilic fiber layer 12 made mainly of hydrophilic fibers. Additionally, boundary regions between the fibers of the hydrophobic fiber layers 11, 11 and the fibers of the hydrophilic fiber layer 12 are configured such that mutual fibers are entangled with each other.

Therefore, the chemical agent with which the hydrophilic fiber layer 12 as the intermediate layer has been impregnated is unlikely to be discharged to a surface to be cleaned that is adjacent to the hydrophobic fiber layer 11 as the surface layer, and the chemical agent can be selectively discharged to the floor surface. It is thus possible to suppress discharge of the chemical agent which is not effective for the cleaning.

Additionally, it is possible to further enhance chemical agent holding properties by air held at the entangled parts by configuring the hydrophobic fibers and the hydrophilic fibers being entangled with each other.

(Hydrophilic Fibers)

As the hydrophilic fibers, it is possible to use natural fibers such as cotton, pulp, or hemp, regenerated fibers such as rayon or cupra, or the like. Among these, it is particularly preferable to use pulp, rayon, polypropylene spun bond fibers (PPSB), or the like from the viewpoint of maintaining water retention properties.

(Hydrophobic Fibers)

Examples of the hydrophobic fibers include polyolefin-based fibers such as polyethylene (PE), polypropylene (PP), or polyvinyl alcohol, polyester-based fibers such as polyethylene terephthalate (PET) or polybutylene terephthalate (PBT), acrylic-based fibers, and the like. These can be used alone, or two or more of them can be used in combination. Examples of composite fibers of two or more kinds include a core-sheath type including a resin sheath with a relatively low melting point (low-melting point resin) and a resin with a relatively high melting point (high-melting point resin) as a core, a side-back type including a low-melting point resin and a high-melting point resin aligned in a predetermined direction, and the like.

(Basis Weight)

In the case of the cleaning wet wipe 100 according to the present invention, the basis weight is preferably 30 g/m2 to 120 g/m2 and is particularly preferably about 60 g/m2 to about 100 g/m2. If the basis weight is less than 30 g/m2, dirt retention capability becomes poor, the cleaning wet wipe 100 is likely to be twisted and become unstable at the time of cleaning. Also, if the basis weight exceeds 120 g/m2, flexibility becomes poor, and it becomes difficult to attach the cleaning wet wipe 100 to the cleaning tool 200.

(CNF)

Also, it is possible to add cellulose nanofibers (CNFs) to the cleaning wet wipe 100.

CNFs refer to cellulose fibers including cellulose fine fibers that are obtained by defibrating pulp fibers and typically have a nano-size (1 nm to 1000 nm) fiber width, and fibers with an average fiber width of not more than 100 nm are preferably used. For calculation of the average fiber width, a number average of a certain number, a median, or a mode diameter (most frequent value), for example, is used.

The CNFs may be in a state where they are uniformly impregnated in the thickness direction of the base paper sheet, and the CNFs are preferably in a state where the content of CNFs gradually increases from the center of the base paper sheet in the thickness direction toward the front surface and the rear surface. This is because the cleaning wet wipe 100 thus becomes unlikely to tear even when the cleaning surface or the like is strongly rubbed therewith.

(Pulp Fiber that can be Used for CNFs)

Examples of pulp fibers that can be used for manufacturing the CNFs include chemical pulp such as hardwood pulp (LBKP) and softwood pulp (NBKP), machine pulp such as bleached thermomechanical pulp (BTMP), stone ground pulp (SGP), pressurized stone ground pulp (PGW), refiner ground pulp (RGP), chemiground pulp (CGP), thermoground pulp (TGP), ground pulp (GP), thermomechanical pulp (TMP), chemi-thermomechanical pulp (CTMP), and refiner mechanical pulp (RMP), waste paper pulp manufactured from used tea paper, used craft envelope paper, used magazine paper, used newspaper, used flyer paper, used office paper, used cardboard paper, used white paper, used Kent paper, used art paper, used ticket paper, used woody paper, and the like, deinked pulp (DIP) obtained by performing a deink treatment on used paper pulp, and the like. These may be used alone, or a plurality of types thereof may be used in combination, as long as the advantages of the present invention are not impaired.

(Method for Defibrating CNFs)

Although it is possible to exemplify mechanical methods such as a high-pressure homogenizer method, a micro-fluidizer method, a grinder grinding method, a bead mill freezing crushing method, and an ultrasonic defibrating method, the defibrating method is not limited thereto.

Note that since the CNFs after being subjected only to the mechanical treatment by the above defibrating method or the like (not modified), that is, the CNFs not modified with a functional group have higher heat stability than those modified with a functional group such as a phosphate group or a carboxymethyl group, such CNFs can be used for a wider range of applications, but it is also possible to use the CNFs modified with a functional group such as a phosphate group or a carboxymethyl group in the present invention.

Also, a chemical treatment such as carboxymethylation may be performed on the pulp fibers after being subjected to a defibrating treatment based on a mechanical method, for example, or an enzyme treatment may be performed thereon. Examples of the CNF after being subjected to a chemical treatment include individualized CNFs (iCNFs) (single nano cellulose) with a diameter of 3 nm to 4 nm, such as TEMPO-oxidized CNFs, phosphorylated CNFs, and phosphite-esterified CNFs, for example.

Additionally, CNFs after being subjected only to a chemical treatment or an enzyme treatment or CNFs obtained by performing a defibrating treatment based on a mechanical method on the CNFs after being subjected to a chemical treatment or an enzyme treatment may be used.

[Chemical Agent]

Also, the cleaning wet wipe 100 according to the present embodiment is impregnated with a predetermined chemical agent containing adjuvants such as glycol ethers, a water-based detergent, an antiseptic, a disinfectant, a lower alcohol, and an organic solvent. The cleaning wet wipe 100 is impregnated with 100% by mass to 500% by mass of chemical agent, and is preferably impregnated with 150% by mass to 300% by mass of chemical agent, with respect to the mass of the base paper sheet that is a base material of the cleaning wet wipe 100.

The dried base paper sheet is impregnated with the chemical agent, and the chemical agent with which the hydrophilic fiber layer 12 is impregnated is discharged from the hydrophobic fiber layer 11 on the front surface and the rear surface when the cleaning wet wipe 100 is used.

[Embossment]

Also, embossments 20 that are parts where the sheet is compressed in the Z direction are arranged in the cleaning wet wipe 100 as illustrated in FIGS. 1 and 2.

The embossments 20 are formed into so-called gourd shapes that have thin and long oval shapes with shorter lengths and narrow widths in one direction and have narrowed parts substantially at centers thereof in the long axis direction in plan view, as illustrated in FIG. 2, for example. The shapes of the embossments 20 are not limited thereto, and various shapes such as polygonal shapes and shapes as combinations of shapes, for example, may be used. However, such gourd shapes are preferable from the viewpoint of improving dirt scraping properties.

Such embossments 20 can be formed through heat embossing under conditions of a temperature of 80° C. to 200° C. and an embossing pressure of 0.2 MPa to 1.0 MPa, for example. In a case whether the embossments 20 are formed through heat embossing, it is possible to use a convex embossment roll having at least an outer circumferential surface made of carbon steel, stainless steel, a cured resin such as polypropylene or an acrylonitrile butadiene styrene (ABS) resin, or the like. Among these, it is particularly preferable to use the convex embossment roll made of stainless steel from the viewpoint of durability and heat resistance.

Also, in the case where embossment working is performed through heat embossing, it is preferable to perform it before the process of impregnating the cleaning wet wipe 100 with the chemical agent in terms of easiness in application of the convex and concave shapes.

(Convex Embossment and Concave Embossment)

As the embossment 20, convex embossments 21 that have convex shapes on the upper side in the Z direction (the first surface side of the cleaning wet wipe 100) and concave embossments 22 that have convex shapes (that is, that have concave shapes on the upper side in the Z direction) on the lower side (the second surface side of the cleaning wet wipe 100) are formed. Note that the convex embossments 21 are illustrated by solid lines while the concave embossments 22 are illustrated by dashed lines in each drawing.

The convex embossments 21 are formed to have lengths of 5 mm to 10 mm, preferably of 6 mm to 8 mm in the long axis direction. Also, the convex embossments 21 are formed to have lengths of 2 mm to 5 mm, preferably of 3 mm to 4 mm in the short axis direction that perpendicularly intersects the long axis direction. Also, the convex embossments 21 are formed to have lengths (the heights from the intermediate part (which will be described later)) of 0.5 mm to 2 mm, preferably of 0.7 mm to 1.5 mm in the Z direction. The concave embossments 22 are formed upside down into substantially the same shapes as the convex embossments 21 and are formed into convexities toward the lower side in the Z direction, in a sectional view.

(Intermediate Part)

An intermediate part is formed between the embossments 20 formed in the cleaning wet wipe 100. Since the intermediate part is a part where the embossments 20 are not formed, the intermediate part is located to be lower than the convex embossments 21 and higher than the concave embossments 22 in the Z direction.

[Embossment Pattern]

In the cleaning wet wipe 100 according to the present embodiment, first embossment blocks 30 with diamond shapes formed from combinations of the convex embossments 21 and the concave embossments 22 in which an angle formed between the first direction (the X direction in FIG. 2) that perpendicularly intersects a first side a and the long axis direction is 30° to 60° form embossment block rows 31 continuously from the first side a to a second side b as illustrated in FIG. 2, for example. Also, the plurality of embossment block rows 31 are continuously arranged from a third side c to a fourth side d. In a first embossment block row 31 and a second embossment block row 31 adjacent to each other, a first embossment block 30 inside the first embossment block row 31 overlaps, in a second direction (the Y direction in FIG. 2) perpendicularly intersecting the first direction, a second embossment block 30 that is adjacent in the second embossment block 31 row. The convex embossments 21 and the concave embossments 22 are arranged such that at least one convex embossment 21 and at least one concave embossment 22 are present on a straight line extended perpendicularly from an arbitrary point on the third side c to the fourth side d.

(Non-Embossment Part)

Also, as illustrated in FIG. 2, a non-embossment part 40 where the cleaning wet wipe 100 is not compressed in the Z direction and raised fabric is included is provided between adjacent embossment blocks 30.

The non-embossment part 40 can be formed by designing the convex embossment roll for forming the embossments 20 to exclude the shape of the non-embossment part 40 or by slightly compressing it as compared with the part compressed for the embossments 20 to such an extent that the raised fabric remains.

It is possible to obtain the cleaning wet wipe 100 that reduces occurrence of wiping streaks and exhibits excellent wiping-off properties by such a non-embossment part 40 being provided at a proportion of 25% to 50% with respect to the area of the cleaning wet wipe 100.

Note that in a case where wiping cleaning is performed with the cleaning wet wipe 100 attached to the cleaning tool 200, the cleaning wet wipe 100 is moved substantially perpendicularly to the X direction or the Y direction. However, in a case where the non-embossment part 40 is formed into one straight line as illustrated in FIG. 2, in particular, there is a concern that wiping streaks are likely to occur depending on the angle at which the cleaning wet wipe 100 is moved. Thus, it is more desirable that the embossment blocks 30 be arranged such that the non-embossment part 40 is not on one straight line.

[Advantages of Invention]

In general, the cleaning tool 200 is moved in the first direction or the second direction when wiping cleaning is performed with the cleaning tool 200 having the head 201. However, in a case where the cleaning wet wipe 100 that has the embossment pattern as described above and has at least one convex embossment 21 present on the straight line extended from the arbitrary point on the third side c to the fourth side d is attached to the cleaning tool 200, the convex embossments 21 have overlapping margin when the wiping cleaning is performed at least in the second direction (the Y direction in FIG. 2). It is thus possible to reduce occurrence of wiping streaks.

Additionally, the convex embossments 21 further projecting than the non-embossment part 40 receives a higher pressure when the wiping cleaning is performed with the cleaning wet wipe 100 by providing the non-embossment part 40 at a proportion of 25% to 50% with respect to the area of the cleaning wet wipe 100 between the embossment blocks 30 without providing the embossments 20 over the entire surfaces of the cleaning wet wipe 100. Therefore, chemical agent discharge properties are improved, and it is possible to further reduce occurrence of wiping streaks.

Also, since the convex embossments 21 receive a higher pressure, scraping properties of the convex embossments 21 is improved, and dust is likely to be accumulated at the non-embossment part 40. It is thus possible to enhance dust capturing properties. In addition, regardless of the improvement in scraping properties of the convex embossments 21 and dust capturing properties of the cleaning wet wipe 100, it is possible to suppress an increase in wiping resistance since the non-embossment part 40 is less likely to be grounded on the surface to be cleaned due to the convex embossments 21.

Also, since the cleaning wet wipe 100 has the three-layer structure with the hydrophilic fiber layer 12 sandwiched between the hydrophobic fiber layers 11, 11, the chemical agent retained by the hydrophilic fiber layer 12 is selectively discharged to the surface to be cleaned. Additionally, it is possible to further enhance chemical agent holding properties by air held at the parts where the hydrophobic fiber layer 11 and the hydrophilic fiber layer 12 are entangled.

Also, since the embossment blocks 30 have diamond shapes including embossments 20 with angles of 30° to 60° between the first direction and the long axis direction, the embossment blocks 30 are inevitably arranged with deviation with respect to the first direction of the cleaning wet wipe 100 when the plurality of embossment block rows 31 in which the embossment blocks 30 are arranged continuously from the first side a to the second side b are arranged continuously from the third side c to the fourth side d. Also, a margin occurs in the angle at which the cleaning wet wipe 100 is moved when a user carries out wiping cleaning.

Also, since the embossments 20 have oval shapes and have shapes having narrowed parts substantially at the centers thereof in the long axis direction, it is possible to enhance dirt scraping performance.

Modification Examples

It is a matter of course that other specific and detailed structures and the like can be appropriately modified.

For example, although the embossment blocks 30 as combinations of the convex embossments 21 and the concave embossments 22 have been described above as an example of the cleaning wet wipe 100, the cleaning wet wipe 100 is not limited thereto. It is only necessary for the embossment blocks 30 to include at least the convex embossments 21.

However, it is possible to flip over and use the cleaning wet wipe 100 and to further widen the cleaning area by providing the concave embossments 22 in the embossment blocks 30, which is preferable.

Also, although the embossment blocks 30 with diamond shapes including embossments 20 with angles of 30° to 60° between the first direction and the long axis direction have been described as an example in FIGS. 1 and 2, the shape of the embossment blocks 30 is not limited thereto. For example, embossment blocks 30 including embossments 20 with angles of 0° or 90° between the first direction and the long axis direction may be used.

Also, although an example in which both the convex embossments 21 and the concave embossments 22 inside each embossment block 30 have the same angle between the long axis direction and the first direction has been described as an example in FIGS. 1 and 2, the convex embossments 21 and the concave embossments 22 are not limited thereto. As illustrated in FIG. 4, the convex embossments 21 and the concave embossments 22 may be arranged such that the long axis directions of the convex embossments 21 and the concave embossments 22 in the first embossment block 30 are different from the long axis directions of the convex embossments 21 and the concave embossments 22 in the second embossment block 30 that is adjacent to the first embossment block 30.

Also, arrangement in which the angles of the convex embossments 21 and the concave embossments 22 inside the first embossment block 30 are different from each other may be used.

Also, the chemical agent with which the cleaning wet wipe 100 is impregnated can be changed in accordance with applications thereof.

Additionally, although the cleaning wet wipe 100 has the three-layer structure, the cleaning wet wipe 100 is not limited thereto.

Moreover, although the first side a and the second side b have been defined as shorter sides of the cleaning wet wipe 100 and the third side c and the fourth side d have been defined as longer sides of the cleaning wet wipe 100 in each drawing, the shorter sides and the longer sides are not limited thereto.

Also, although both the convex embossments 21 and the concave embossments 22 have substantially the same gourd shapes in plan view in each drawing, the convex embossments 21 and the concave embossments 22 may have different shapes.

However, the convex embossments 21 and the concave embossments 22 in the cleaning wet wipe 100 are preferably arranged to be substantially symmetrical between the first surface and the second surface in any of the above embossment patterns. In this manner, the first surface and the second surface of the cleaning wet wipe 100 have similar cleaning functions, and it is possible to increase the wiping area per sheet.

EXAMPLES

Next, results of evaluating preferable configurations in examples and comparative examples of the present invention will be described. Although the present invention will be specifically described below on the basis of the examples, the present invention is not limited thereto.

[Sample Creation]

First, two hydrophobic fiber layers with a measured weight of 40 g/m2 to 50 g/m2 and with a proportion of 80% of PET and 20% of PP/PE binder and one hydrophilic fiber layer with a measured weight of 40 g/m2 to 50 g/m2 and with a proportion of 70% of pulp and 30% of PPSB were created. Then, entangling was caused by a water flow entanglement method such that both surfaces of the hydrophilic fiber layer were sandwiched by the hydrophobic fiber layers, the layers were cut into a size of 300 mm×200 mm, thereby creating one base paper sheet.

Next, heat embossing working was performed on the base paper sheet under conditions of a temperature of 95° C. and an embossing pressure of 0.4 MPa to obtain the embossment patterns in Examples 1 to 3 and Comparative Examples 1 to 3 below, thereby creating test sheets.

Example 1; Non-Embossment Part 25%

The plurality of embossment block rows 31 in which the plurality of first embossment blocks 30 with diamond shapes that were combinations of the gourd-shaped convex embossments 21 and concave embossments 22 with an angle of 30° between the first direction (the X direction in FIG. 2) and the long axis direction were continuously arranged from the first side a to the second side b opposite to the first side a as illustrated in FIG. 2 were continuously arranged from a third side c to a fourth side d. At this time, in the adjacent first embossment block row 31 and second embossment block row 31, the embossments 20 were arranged such that the first embossment blocks 30 in the first embossment block row 31 overlap, in the first direction, the adjacent second embossment blocks 30 in the second embossment block row 31 and at least one convex embossment 21 was present on a line extended perpendicularly from an arbitrary point on the third side c to the fourth side d, and the non-embossment part 40 was provided between the embossment blocks 30 at a proportion of 25.0% with respect to the area of the base paper sheet.

Example 2; Non-Embossment Part 37.5%

As illustrated in FIG. 5A, the non-embossment part 40 was provided at a proportion of 37.5% with respect to the area of the base paper sheet.

The other conditions were the same as those in Example 1.

Example 3; Non-Embossment Part 50%

As illustrated in FIG. 5B, the non-embossment part 40 was provided at a proportion of 50.0% with respect to the area of the base paper sheet.

The other conditions were the same as those in Example 1.

Comparative Example 1; Non-Embossment Part 0%, Serial Arrangement

As illustrated in FIG. 5C, gourd-shaped convex embossments and concave embossments with long axis directions parallel to the first direction were alternately arranged over the entire surface of the base paper sheet, thereby creating a test sheet with no non-embossment part 40.

Comparative Example 2; Non-Embossment Part 0%, Zigzag Shape

A plurality of first convex embossments and second convex embossments, which were gourd-shaped embossments, with different long axis directions were provided and arranged such that first convex embossments that were adjacent in the short axis direction overlapped parts of both the first convex embossments in the short axis direction and deviated in the long axis direction and such that the second convex embossments that were adjacent in the short axis direction overlapped parts of both the second convex embossments in the short axis direction and deviated in the long axis direction.

Such a plurality of first convex embossments and second convex embossments were caused to be adjacent to each other with the long axis directions forming a substantially right angle and were continuously arranged from the first side a of the base paper sheet to the second side b opposite to the first side a.

Also, the concave embossments were arranged in an embossment pattern similar to that of the convex embossments alternately with the convex embossments, thereby creating a test sheet with no non-embossment part 40 as illustrated in FIG. 5D.

Comparative Example 3; Non-Embossment Part 100%

A test sheet having only the non-embossment part 40 was created without performing embossing working.

The test sheets in Examples 1 to 3 and Comparative Examples 1 to 3 were impregnated with 300% by mass of chemical agent containing a water-based detergent, an antiseptic, a disinfectant, and an alcohol with respect to the dry weight, thereby creating wet wipes in Examples 1 to 3 and Comparative Examples 1 to 3. Then, these wet wipes were attached to the cleaning tools having flat heads of 250 mm×100 mm, thereby creating the wet sheet wipers in Examples 1 to 3 and Comparative Examples 1 to 3.

The wet sheet wipers in Examples 1 to 3 and Comparative Examples 1 to 3 were used to conduct the following tests 1 to 3.

[Test 1. Wiping streak test]

    • (1) The wet sheet wiper with a weight placed thereon such that the total weight was 400 g was placed on a right end of a black board with the head facing it.
    • (2) The weight and the wet sheet wiper were pushed from the right end to the left end of the black board and were moved by 300 mm.
    • (3) Generated wiping streaks were visually evaluated on the assumption that a state where substantially no wiping streaks occurred on the cleaning surface (the wet area was about 90% to 100% with respect to the entire cleaning surface) was a circle, a state where wiping streaks slightly occurred (the wet area was about 80% to 90% with respect to the entire cleaning surface) was a triangle, and a state where many wiping streaks occurred (the wet area was not more than 80% with respect to the entire cleaning surface) was a cross mark.

[Test 2. Wiping-Off Performance Test]

    • (1) Fake dirt obtained by blending beef tallow:olive oil:chloroform:fluorescent paint at a ratio of 12.5:12.5:74.4:0.6 (mass ratio) was dropped in amount of 15 ml and was spread on a stainless steel plate of 480 mm×320 mm and was then dried by a hot air drier (temperature of 60° C.) for 5 minutes, and the weight of the stainless steel plate was measured.
    • (2) The wet sheet wiper with a weight placed thereon such that the total weight was 500 g was placed on the right end of the stainless steel plate with the head facing it.
    • (3) The weight and the wet sheet wiper were pushed and moved from the right end to the left end of the stainless steel plate, only the stainless steel plate was dried again by the hot air drier (temperature of 60° C.) for 5 minutes, and the weight was measured.
    • (4) The wiping amount of each cleaning wet wipe was calculated from a difference between the weight of the stainless steel plate before the test measured in (1) and the weight of the stainless steel plate after the test measured in (3).
    • (5) The operations in (1) to (4) were performed twice, and an average value of the wiping amounts was calculated.

[Test 3. Wiping Resistance Test]

    • (1) The wet sheet wiper with a weight placed thereon such that the total weight was 500 g was placed on a composite flooring such that the head faced it.
    • (2) A hole was opened at a head connecting part of the wiper body, and a push-pull gauge (DS2-200N manufactured by IMADA Co., Ltd.) was attached to the hole.
    • (3) The maximum resistance value when the wet sheet wiper with the push-pull gauge attached thereto was pulled by 50 cm was measured.
    • (4) The operation in (3) was performed five times, and an average value of wiping resistances was calculated.

Results of the tests 1 to 3 are shown in Table I.

TABLE 1 Comparative Comparative Example 1 Example 2 Comparative Non- Non- Example 1 Example 2 Example 3 Example 3 embossment embossment Non- Non- Non- Non- part 0% part 0% embossment embossment embossment embossment (series) (zigzag) part 25% part 37.5% part 50% part 100% Test 1 x Δ ○ ○ ○ ○ (Wiping streak amount) Test 2 3.30 g 3.90 g 4.35 g 4.12 g 4.00 g 3.87 g (Wiping amount) N = 2 Test 3 2.14N 2.20N 2.16N 2.08N 2.02N 2.44N (Wiping resistance) N = 5

[Evaluation]

It is possible to ascertain from comparison of the results of the test 1 that occurrence of wiping streaks was able to be further reduced in Examples 1 to 3 in which the non-embossment part 40 was provided as compared with Comparative Example 1 and Comparative Example 2 in which the non-embossment part 40 was not provided. This is considered to be because the pressure imparted on the convex embossments 21 increased due to the non-embossment part 40 being provided and the chemical agent discharge properties were enhanced.

On the other hand, occurrence of wiping streaks slightly increased as the proportion of the non-embossment part 40 increased, in comparison of Examples 1 to 3 and Comparative Example 3. This is considered to be because as the proportion of the non-embossment part 40 increased, the number of convex embossments 21 decreased, the contact area with the black board decreased, and the chemical agent discharge properties decreased.

Also, it is possible to ascertain from comparison of the results of the test 2 that the wiping amount increased and wiping-off performance was thus improved in Examples 1 to 3 in which the non-embossment part 40 was provided as compared with Comparative Example 1 and Comparative Example 2 in which the non-embossment part 40 was not provided.

On the other hand, it is possible to ascertain from comparison of Examples 1 to 3 that it was possible to wipe-off the largest amount of dirt in Example 1 in which the non-embossment part 40 was provided at the proportion of 25% and the dirt wiping amount decreased as the non-embossment part 40 increased in proportion. This is considered to be because as the proportion of the non-embossment part 40 increased, the number of convex embossments 21 correspondingly decreased, and the chemical agent discharge properties and the dirt scraping properties decreased as described above.

Also, in comparison of the results of the test 3, the wiping resistance was high only in Comparative Example 3 in which the embossments 20 were not provided in the entire surface, while there was no significant difference in wiping resistances in Comparative Example 1 and Comparative Example 2 in which the non-embossment part 40 was not provided and in Examples 1 to 3 in which the non-embossment part 40 was provided.

This is considered to be because the wiping resistance over the entire cleaning wet wipe 100 was not very different since the non-embossment part 40 was unlikely to be grounded with the surface to be cleaned.

INDUSTRIAL APPLICABILITY

The present invention can be used for a cleaning wet wipe capable of reducing occurrence of wiping streaks when wiping cleaning is performed with the cleaning wet wipe attached to a cleaning tool having a head.

REFERENCE SIGNS LIST

    • 100 Cleaning wet wipe
    • 11 Hydrophobic fiber layer
    • 12 Hydrophilic fiber layer
    • 20 Embossment
    • 21 Convex embossment
    • 22 Concave embossment
    • 30 Embossment block
    • 31 Embossment block row
    • 40 Non-embossment part
    • 200 Cleaning tool
    • 201 Head
    • a First side
    • b Second side
    • c Third side
    • d Fourth side

Claims

1. A cleaning wet wipe that is obtained by impregnating a base paper sheet with a chemical agent and is used with the cleaning wet wipe attached to a cleaning tool having a head, the cleaning wet wipe comprising:

embossment blocks, in each of which a plurality of convex embossments that are embossments having convexity are gathered, in a first surface of the cleaning wet wipe,
wherein the plurality of embossment blocks are continuously arranged and form embossment block rows from a first side to a second side opposite to the first side,
non-embossment parts where the embossments are not arranged are included between other ones of the embossment blocks which are adjacent,
the plurality of embossment block rows are continuously arranged from a third side perpendicularly intersecting the first side to a fourth side opposite to the third side,
the non-embossment parts are provided at a proportion of not less than 25% and not more than 50% with respect to an area of the cleaning wet wipe, and
the convex embossments are arranged such that at least one convex embossment is present on a straight line extended perpendicularly from an arbitrary point on the third side to the fourth side.

2. The cleaning wet wipe according to claim 1, comprising:

concave embossments that are embossments having convexity in a second surface of the cleaning wet wipe,
wherein the embossment blocks are combinations of the plurality of convex embossments and the concave embossments, and
the concave embossments are arranged such that at least one concave embossment is present on a line extended from an arbitrary point on the third side to the fourth side.

3. The cleaning wet wipe according to claim 1,

wherein the base paper sheet includes hydrophobic fiber layers that form surfaces of the sheet, and
a hydrophilic fiber layer that is sandwiched between the hydrophobic fiber layers, and
mutual fibers are entangled in boundary regions between the hydrophobic fiber layers and the hydrophilic fiber layer.

4. The cleaning wet wipe according to claim 1,

wherein an angle formed between a long axis direction of the embossments and a first direction that perpendicularly intersects the first side is not less than 30° and not more than 60°, and
the embossment blocks have diamond shapes.

5. The cleaning wet wipe according to claim 1, wherein the embossments have oval shapes and have narrowed parts at substantially centers thereof in the long axis direction.

Patent History
Publication number: 20240057840
Type: Application
Filed: Jan 12, 2022
Publication Date: Feb 22, 2024
Applicant: DAIO PAPER CORPORATION (Shikokuchuo-shi, Ehime)
Inventor: Yuhei YAMASAKI (Shikokuchuo-shi, Ehime)
Application Number: 18/260,704
Classifications
International Classification: A47L 13/17 (20060101); A47L 13/254 (20060101); D04H 1/425 (20060101); D04H 1/4374 (20060101); D06C 23/04 (20060101);