Bag with re-sealable and tearable band

Patent metadata

Field	Value
Publication number	US-10124933-B2
Application number	US-201514802350-A
Country	US
Kind code	B2
Filing date	Jul 17, 2015
Priority date	Jul 18, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A temporary adhesive band provides a releasable sealing structure and a tearing structure in a plastic bag. The band can be coextruded with one or more panels of the bag and can be made from a polymer blend. It can have a relatively thick tear section that defines a tear line at a zone of weakness in the bag so that a closed end of the bag can be easily removed. The band also can have a releasable sealing section that remains attached to the bag after the closed end of the bag has been removed by tearing the bag along the tear line so that the bag can be resealed once it has been opened. The releasable sealing section of the temporary adhesive band is preferably made from a coextruded material with tacky properties so that no additional adhesive is required for resealing the bag.

First claim

What is claimed is:

1. A plastic bag comprising;
a first panel;
a second panel, the first panel and second panel defining a bag interior and an opening at an end margin of the first and second panels to permit access to the bag interior; and
a temporary adhesive band at the end margin of at least the first panel comprising a releasable adhesive having a lower tear strength than the first and second panels, the temporary adhesive band comprising:
a tear section defining a tear line along which the first panel and temporary adhesive band are configured to tear to expose the opening and permit access to the bag interior; and
a releasable sealing section configured to repeatedly and nondestructively seal and unseal the first and second panels to close the opening and prevent access to the bag interior;
wherein the tear section and the releasable sealing section of the temporary adhesive band are contiguous with one another.

2. The plastic bag of claim 1 wherein the temporary adhesive band comprises a coextruded section of the first panel.

3. The plastic bag of claim 2 wherein the temporary adhesive band comprises an immiscible polymer blend.

4. The plastic bag of claim 3 wherein the immiscible polymer blend comprises a polyethylene and a polypropylene.

5. The plastic bag of claim 2 wherein the tear section and releasable sealing section of the band have a thickness and wherein the thickness of the tear section is greater than the thickness of the sealing section.

6. The plastic bag of claim 5 wherein the first panel has a thickness and wherein the thickness of the tear section is between about 70% and about 100% of the thickness of the first panel.

7. The plastic bag of claim 5 wherein the first panel has a thickness and wherein the thickness of the releasable sealing section is between about 5% to about 50% of the thickness of the first panel.

8. The plastic bag of claim 1 wherein the temporary adhesive band comprises a foaming agent concentrate.

9. The plastic bag of claim 1 wherein the temporary adhesive band comprises a cling agent concentrate.

10. The plastic bag of claim 9 wherein the cling agent concentrate comprises polyisobutylene.

11. The plastic bag of claim 1 further comprising a temporary adhesive band at the end margin of the second panel comprising a releasable adhesive having a lower tear strength than the first and second panels, the temporary adhesive band at the end margin of the second panel comprising:
a tear section defining a tear line along which the second panel is configured to tear to expose the opening and permit access to the bag interior; and
a releasable sealing section configured to repeatedly and nondestructively seal and unseal the first and second panels to close the opening and prevent access to the bag interior.

12. The plastic bag of claim 11 wherein the temporary adhesive band of the first panel is oriented to contact the temporary adhesive band of the second panel when the temporary adhesive bands are used to seal the opening.

13. The plastic bag of claim 1 wherein the tear section is non-perforated.

14. The plastic bag of claim 1 wherein the temporary adhesive band comprises a polymer blend and the first panel comprises a polymer of a type, the polymer blend being partially composed of a polymer of the same type.

15. The plastic bag of claim 1 wherein the tear section is disposed outboard of the releasable sealing section.

16. The plastic bag of claim 1 further comprising a zippered seal.

17. The plastic bag according to claim 1 , wherein the releasable sealing structure provides a leak-proof seal of the bag interior.

18. The plastic bag according to claim 1 further comprising a permanent sealing structure configured to permanently seal the first and second panels at an outer portion of the end margin outboard of the temporary adhesive band and prevent access to the bag interior such that the bag cannot be reopened without destruction of the bag.

19. A temporary adhesive band in a plastic bag comprising at least one bag panel, the temporary adhesive band being located adjacent an opening of the bag at an end margin of the panel, the temporary adhesive band comprising:
a releasable adhesive having a lower tear strength than the first and second panels;
a tear section defining a tear line along which the first panel is configured to tear to expose the opening and permit access to an interior of the bag; and
a releasable sealing section configured to repeatedly and nondestructively seal and unseal the first and second panels to close the opening and prevent access to the bag interior;
wherein the tear section and the releasable sealing section are made of the same material and are coextruded with the bag panel.

20. A plastic bag comprising;
a first panel;
a second panel, the first panel and second panel defining a bag interior and an opening at an end margin of the first and second panels to permit access to the bag interior; and
a temporary adhesive band at the end margin of at least the first panel having a top edge and a bottom edge, the temporary adhesive band comprising a releasable adhesive having a lower tear strength than the first and second panels and being configured to repeatedly and nondestructively seal and unseal the first and second panels to close the opening and prevent access to the bag interior, the temporary adhesive band defining a tear line along which the first panel is configured to tear to expose the opening and permit access to the bag interior;
wherein the temporary adhesive band has a height extending between the top edge and the bottom edge and the releasable adhesive both is confined to the height and extends continuously along the height from the bottom edge to the top edge.

21. The plastic bag of claim 20 wherein the tear line is at an outer side of the temporary adhesive band such that a releasable sealing section of the temporary adhesive band remains attached to the first panel after the first panel is torn along the tear line to remove a portion of the first panel, the releasable sealing section of the temporary adhesive band being configured to repeatedly and nondestructively seal and unseal the first and second panels to close the opening and prevent access to the bag interior after the first panel is torn along the tear line.

Assignees

• Inteplast Group Ltd
• Inteplast Group Corp

Inventors

• Tseng Ben
• Lin Ter-Hai
• Yang Kelvin
• Li Jyh-Yao Raphael

Classifications

• B65D75/58

  Opening or contents-removing devices added or incorporated during package manufacture {(B65D75/36, B65D85/1027 take precedence)} · CPC title

• B65D33/2508

  using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor · CPC title

• B65D33/18 Primary

  using adhesive applied to integral parts, e.g. to flaps · CPC title