Trash bag with inner bag

Patent metadata

Field	Value
Publication number	US-9387957-B2
Application number	US-201213357892-A
Country	US
Kind code	B2
Filing date	Jan 25, 2012
Priority date	Jan 25, 2012
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

Trash bags may be formed to include first and second sidewalls joined along a first side edge, an opposite second side edge, and a closed bottom edge to form an outer bag. A second inner bag may be inserted within the first bag to form a “bag-in-a-bag” type configuration in which the inner bag is bonded to the outer bag along side seals. When the outer and inner bags are formed primarily from LLDPE thermoplastic resin using a blown film process, the inventors have surprisingly found that such configurations provide increased and unexpected strength properties while using less material.

First claim

What is claimed is:

1. A draw tape bag having an interior and an exterior and comprising:
an outer transparent or translucent bag having a first sidewall made of a first flexible thermoplastic web material and a second sidewall of a sheet of flexible thermoplastic web material of the same sheet folded, overlaid and joined to the first sidewall to provide an interior volume, the first and second sidewalls joined along a first sealed side edge, an opposite second sealed side edge, and a closed bottom folded edge, the first and second sidewalls un-joined along their respective top edges to define an opening opposite the bottom edge for accessing the interior volume;
an inner transparent or translucent bag separated from and within the interior volume of the outer bag and having a first sidewall made of the first flexible thermoplastic web material and a second sidewall of a sheet of flexible thermoplastic web material of the same sheet folded, overlaid and joined to the first sidewall to provide an interior volume, the first and second sidewalls of the inner bag joined along the first sealed side edge and the second sealed side edge of the outer bag, and a closed bottom folded edge of the inner bag, the first and second sidewalls un-joined along their respective top edges to define an opening opposite the bottom edge for accessing the interior volume;
wherein the top edges of the first sidewalls of the inner and outer bags are attached together and the top edges of the second sidewalls of the inner and outer bags are attached together;
the first and second sidewalls of the outer bag and the first and second sidewalls of the inner bag folded over at the respective top edges and attached to the inside of the first and second sidewalls of the inner bag forming a hem extending along the open top end disposed opposite the bottom edge of the outer bag, the hem having a hem seal, the hem including one or more draw tape notches and a draw tape within the hem, the hem having an exterior surface and an interior surface where the outer bag first and second sidewalls form both the interior surface and the exterior surface of the hem;
wherein the sidewalls of the outer bag and the sidewalls of the inner bag:
contain greater than 50% LLDPE;
one or more of reclaimed resin from trash bags, processing aide, colorant containing carbon black, or a colorant containing white TiO2;
each have a machine direction to transverse direction tear ratio of 0.25 to 0.70; and
are produced by a blown film process.

2. The draw tape bag of claim 1 , wherein the draw tape is sealed at the first and second side seals.

3. The draw tape bag of claim 1 , wherein the draw tape notches are centered between the first and second side edges.

4. The draw tape bag of claim 1 , wherein the draw tape is not sealed at the first and second side seals.

5. The draw tape bag of claim 1 , wherein the outer bag first sidewall is a coextruded multi-layer material.

6. The draw tape bag of claim 1 , wherein the inner bag first sidewall is a coextruded multi-layer material.

7. The draw tape bag of claim 1 , wherein the outer bag first sidewall is lightly tacked or selectively laminated to the inner bag first sidewall.

8. The draw tape bag of claim 1 , wherein the inner bag has an interior surface and the hem seal is formed by attaching a hem flap of the inner bag to the interior surface of the sidewall of the inner bag.

9. The draw tape bag of claim 1 , wherein the outer bag first sidewall is thicker than the inner bag first sidewall.

10. The draw tape bag of claim 1 , wherein the outer bag first sidewall is thinner than the inner bag first sidewall.

11. The draw tape bag of claim 1 , wherein the outer bag is longer than the inner bag.

12. The draw tape bag of claim 1 , wherein the outer bag is liquid impervious and the inner bag is liquid pervious.

13. A draw tape bag having an interior and an exterior and comprising:
an outer transparent or translucent bag having a first sidewall made of a first flexible thermoplastic web material and a second sidewall made of the first flexible thermoplastic web material, overlaid and joined to the first sidewall to provide an interior volume, the first and second sidewalls joined along a first sealed side edge, an opposite second sealed side edge, and a closed bottom edge, the first and second sidewalls un-joined along their respective top edges to define an opening opposite the bottom edge for accessing the interior volume;
an inner transparent or translucent bag separated from and within the interior volume of the outer bag and having a first sidewall made of the first flexible thermoplastic web material and a second sidewall made of the first flexible thermoplastic web material, overlaid and joined to the first sidewall to provide an interior volume, the first and second sidewalls of the inner bag joined along the first sealed side edge and the second sealed side edge of the outer bag, and a closed bottom edge of the inner bag, the first and second sidewalls un-joined along their respective top edges to define an opening opposite the bottom edge for accessing the interior volume;
wherein the top edges of the first sidewalls of the inner and outer bags are attached together and the top edges of the second sidewalls of the inner and outer bags are attached together;
the first and second sidewalls of the outer bag and the first and second sidewalls of the inner bag folded over at the respective top edges and attached to the inside of the first and second sidewalls of the inner bag forming a hem extending along the open top end disposed opposite the bottom edge of the outer bag, the hem having a hem seal, the hem including one or more draw tape notches and a draw tape within the hem, the hem having an exterior surface and an interior surface where the outer bag first and second sidewalls form both the interior surface and the exterior surface of the hem;
wherein the sidewalls of the outer bag and the sidewalls of the inner bag:
contain greater than 50% LLDPE;
one or more of reclaimed resin from trash bags, processing aide, colorant containing carbon black, or a colorant containing white TiO2;
each have a machine direction to transverse direction tear ratio of 0.25 to 0.70;
are produced by a blown film process; and
the combined thicknesses of the first sidewall of the outer bag and the first sidewall of the inner bag is less than 0.0015 inches (0.038 cm).

14. The draw tape bag of claim 13 , wherein both the outer bag first sidewall and the inner bag first sidewall are each a coextruded multi-layer ply of material.

15. The draw tape bag of claim 14 , wherein each layer of the outer bag first sidewall coextruded multi-layer ply and each layer of the inner bag first sidewall coextruded multi-layer ply each comprise greater than 50% LLDPE.

16. The draw tape bag of claim 13 , wherein both the outer bag first sidewall and the inner bag first sidewall are each a coextruded tri-layer ply where the central layer contains recycled material.

17. The draw tape bag of claim 13 , wherein the combined thicknesses of the first sidewall of the outer bag and the first sidewall of the inner bag is less than 0.001 inches (0.025 cm).

18. The draw tape bag of claim 13 , wherein the outer bag closed bottom edge is a folded edge and the inner bag closed bottom edge is a folded edge.

19. The draw tape bag of claim 13 , wherein the outer bag closed bottom edge is a sealed edge and the inner bag closed bottom edge is a sealed edge.

20. A draw tape bag havin

Assignees

• Fraser Robert W
• Borchardt Michael G
• Macpherson Jack A
• Dorsey Robert T
• Binger Scott
• Broering Shaun T
• Glad Products Co

Inventors

• Fraser Robert W
• Borchardt Michael G
• Macpherson Jack A
• Dorsey Robert T
• Binger Scott
• Broering Shaun T

Classifications

• B65F1/0006

  Flexible refuse receptables, e.g. bags, sacks · CPC title

• B65F1/002

  with means for opening or closing of the receptacle · CPC title

• B65D33/28 Primary

  Strings or strip-like closures {, i.e. draw closures} · CPC title