STAY OPEN BAG MOUTH AND METHODS OF MANUFACTURE
The present disclosure relates to a stay-open configuration or structure at the mouth of a polymeric or similar package or bag, wherein the configuration or structure has sufficient stiffness or tenacity to be able to maintain the mouth of the package or bag in an open position after being placed into this position. The semi-rigid material which implements the stay-open configuration can be incorporated into zipper components, such as, but not limited to, the flanges. The semi-rigid material may further be a separate element which is attached proximate to the zipper. The semi-rigid material typically goes through processes of extrusion and orientation.
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This application claims priority under 35 U.S.C. §119(e) of U.S. provisional patent application Ser. No. 61/583,694 filed on Jan. 6, 2012, the contents of which is hereby incorporated by reference in its entirety.
BACKGROUND OF THE DISCLOSURE1. Field of the Disclosure
The present disclosure relates to a stay-open configuration or structure at the mouth of a polymeric or similar package or bag, wherein the configuration or structure has sufficient stiffness or tenacity to be able to maintain the mouth of the package or bag in an open position after being placed into this position.
2. Description of the Prior Art
In the prior art, reclosures are a common feature on many flexible packages or bags used in the food industry. While the reclosure gives the end user the freedom to use or consume a portion of the contents of the package and store the remainder for future use, simple access to the package contents is not always guaranteed. Because the reclosures on the package are flexible, they do not tend to stay in an open position when opened, thereby typically requiring two-handed operation and raising the possibility that the food item will touch the sides of the package as it is being removed from or placed into the package. For items that are dusty, granular, sticky, greasy, wet, or otherwise unstable or unpleasant to handle, not having a bag or pouch that has the ability to stay open while filling or emptying can be disadvantageous.
U.S. Pat. No. 7,011,879 entitled “Composite Polymeric Twist Tie” issued on Mar. 14, 2006 to Contreras et al. describes a configuration with a twist tie that is made from plastic materials and which exhibits dead fold/twist characteristics. This reference further describes methods of orienting plastics such that they are able to maintain a dead fold.
OBJECTS AND SUMMARY OF THE DISCLOSUREIt is therefore an object of the present disclosure to provide a configuration or structure for a reclosable package or bag, wherein configuration or structure can maintain the mouth of the package or bag in an open position after being placed into this position.
This and other objects are attained by providing a stiff polyethylene member proximate to the mouth of a bag. The member can be produced in various cross sections, such as, but not limited to, round or square. The member is produced by stretching through a forming mandrel, with the stretching step having the impact of significantly raising the modulus of the polyethylene material, making it capable of taking a fold or bend and remaining bent or folded. The high modulus polyethylene structure is then placed on to a zipper pouch, typically by sealing it into the pouch behind the zipper. This disclosure therefore incorporates zipper extrusion and orientation. This is intended to preferentially hold the mouth of the pouch open whenever the pouch is placed into an open configuration.
This typically results in the additional advantages that no metal wire is required, that secondary manufacturing steps are eliminated or reduced, and that a relatively inexpensive method and process is utilized.
Further objects and advantages of the disclosure will become apparent from the following description and from the accompanying drawings, wherein:
Referring now to the drawings in detail wherein like numerals indicate like elements throughout the several views, one sees that
As a further separate alternative, in order to incorporate the semi-rigid elements into the flanges 122, 124, 132, 134 or other elements of the zipper 114 as illustrated in
Thus the several aforementioned objects and advantages are most effectively attained. Although preferred embodiments of the invention have been disclosed and described in detail herein, it should be understood that this invention is in no sense limited thereby and its scope is to be determined by that of the appended claims.
Claims
1. A polymeric bag or container, including:
- a front wall and a rear wall, sealed together at edges thereof thereby forming a mouth;
- a reclosure extending around the mouth, thereby making the mouth reclosable;
- a semi-rigid element extending around and attached to the mouth with a sufficient modulus for the mouth of the bag to maintain an open position after being placed in an open position.
2. The polymeric bag or container of claim 1 wherein the semi-rigid element is made of polyethylene which has undergone steps of extruding and stretching.
3. The polymeric bag or container of claim 1 wherein the semi-rigid element includes at least a portion of high density polyethylene.
4. The polymeric bag or container of claim 2 wherein the step of stretching increases the modulus of the semi-rigid element in order for the semi-rigid element to maintain an open or a closed position of the bag.
5. The polymeric bag of claim 2 wherein the semi-rigid element is positioned between the reclosure and the front wall and between the reclosure and the rear wall.
6. The polymeric bag of claim 2 wherein the reclosure is a zipper including a first profile and a second profile, wherein the first profile includes at least one first flange and the second profile includes at least one second flange, and wherein the semi-rigid element forms at least the one first flange and the at least one second flange.
7. The polymeric bag of claim 2 wherein the first profile includes a first interlocking element and the second profile includes a second interlocking element.
8. The polymeric bag of claim 7 wherein the first and second interlocking elements are at least partially formed from low density polyethylene and the at least one first flange and the at least one second flange are at least partially formed from high density polyethylene.
9. The polymeric bag of claim 8 wherein the first and second interlocking elements are co-extruded with the at least one first flange and the at least one second flange.
10. The polymeric bag of claim 2 wherein the semi-rigid element is separate from the reclosure.
11. The polymeric bag of claim 2 wherein the semi-rigid element is attached in a position chosen from the group consisting of behind the bag wall, behind the interlocking elements and attached to the flanges.
12. A reclosure for a bag or container, including:
- a first interlocking profile and a second interlocking profile;
- the first and second interlocking profiles including a semi-rigid element with a sufficient modulus for the reclosure to maintain an open position after being placed in an open position.
13. The reclosure of claim 12 wherein the semi-rigid element is made of polyethylene which has undergone steps of extruding and stretching.
14. The reclosure of claim 12 wherein the semi-rigid element includes at least a portion of high density polyethylene.
15. The reclosure of claim 13 wherein the step of stretching increases the modulus of the semi-rigid element in order for the semi-rigid element to maintain an open or a closed position of the bag.
16. The reclosure of claim 13 wherein the reclosure is a zipper including a first profile and a second profile, wherein the semi-rigid element is attached to outwardly facing portions of the first and second profiles.
17. The reclosure of claim 13 wherein the reclosure is a zipper including a first profile and a second profile, wherein the first profile includes at least one first flange and the second profile includes at least one second flange, and wherein the semi-rigid element forms at least the one first flange and the at least one second flange.
18. The reclosure of claim 13 wherein the first profile includes a first interlocking element and the second profile includes a second interlocking element.
19. The reclosure of claim 18 wherein the first and second interlocking elements are at least partially formed from low density polyethylene and the at least one first flange and the at least one second flange are at least partially formed from high density polyethylene.
20. The reclosure of claim 19 wherein the first and second interlocking elements are co-extruded with the at least one first flange and the at least one second flange.
21. The reclosure of claim 13 wherein the semi-rigid element is attached in a position chosen from the group consisting of behind the bag wall, behind the interlocking elements and attached to the flanges.
Type: Application
Filed: Jan 4, 2013
Publication Date: Jul 11, 2013
Applicant: ILLINOIS TOOL WORKS INC. (Glenview, IL)
Inventor: ILLINOIS TOOL WORKS INC. (Glenview, IL)
Application Number: 13/734,346
International Classification: B65D 35/24 (20060101);