Polymeric films and bags

Patent metadata

Field	Value
Publication number	US-11440704-B2
Application number	US-202117240304-A
Country	US
Kind code	B2
Filing date	Apr 26, 2021
Priority date	Mar 12, 2015
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

The present invention is directed to a method of incrementally stretching polymeric film formed from a blown film extrusion process. The present invention is further directed to a polymeric bag formed from an incrementally stretched polymeric film. The incremental stretching is performed on a collapsed polymeric bubble via a pair of intermeshing rollers. The incrementally stretched polymeric film may be stretched only along a portion of its width. The polymeric bag may be a drawstring trash bag with an extended hem where only the extended hem of the bag or the body of the bag comprises incrementally stretched polymeric film.

First claim

What is claimed is:

1. A bag formed from polymeric film of a collapsed bubble, the bag comprising:
a front panel and a back panel, the front panel and back panel generally joined along a first side edge, a second side edge, and a bottom edge of the respective front panel and back panel,
the front panel having an upper distal edge opposite the bottom edge, the distal edge resulting from a folded over portion of the front panel providing a first hem, a top of the first hem defining an upper opening of the bag,
the first hem comprising at least two layers of polymeric film below the upper opening, a first hem seal sealing together the at least two layers of polymeric film,
the first hem comprising incrementally stretched polymeric film, and
the front panel below the first hem having no incrementally stretched polymeric film.

2. The bag of claim 1 further comprising:
the incrementally stretched polymeric film comprising a fraction of an incrementally stretched partial width of the collapsed bubble.

3. The bag of claim 1 further comprising:
the bottom edge of the bag corresponding to an outer edge of the collapsed bubble.

4. The bag of claim 1 further comprising:
the first hem of the polymeric bag including a drawstring.

5. A bag formed from polymeric film of a collapsed bubble, the bag comprising:
a front panel and a back panel, the front panel and back panel generally joined along a first side edge, a second side edge, and a bottom edge of the respective front panel and back panel,
the front panel having a distal edge opposite the bottom edge, the distal edge of the front panel resulting from a folded over portion of the front panel providing a first hem, a top of the first hem defining an upper opening of the bag,
the first hem comprising at least two layers of polymeric film sealed together by a first hem,
the first hem comprising incrementally stretched polymeric film, and
the front panel below the first hem comprising un-stretched polymeric film.

6. The bag of claim 5 further comprising:
the bottom edge of the bag corresponding to an outer edge of the collapsed bubble.

7. The bag of claim 5 further comprising:
the incrementally stretched polymeric film comprising an incrementally stretched partial width of the collapsed bubble.

8. The bag of claim 5 further comprising:
the first hem of the polymeric bag including a drawstring.

Assignees

• Poly America Lp

Inventors

• Cobler Brad A

Classifications

• B29C48/0022

  combined with cutting · CPC title

• B29C55/18

  by squeezing between surfaces, e.g. rollers · CPC title

• B65D33/02

  Local reinforcements or stiffening inserts, e.g. wires, strings, strips or frames {(B65D33/007 takes precedence)} · CPC title

• B29C2793/0063

  Cutting longitudinally · CPC title

• B65D31/02 Primary

  with laminated walls · CPC title