Polymeric films and bags
AssigneePoly-America, L.P.
InventorBrad A. Cobler
Life of this patent
Estimating the term…
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 polymeric bag comprises incrementally stretched polymeric film.
Claims15
A method of forming a master roll of polymeric film for forming trash bags, the method comprising:
- forming a polymeric film tube via a blown film extrusion process,
- collapsing the polymeric film tube to form a collapsed bubble,
- ring-rolling a partial width of the collapsed bubble forming an incrementally stretched partial width,
- slitting the collapsed bubble lengthwise in proximity to the centerline of the collapsed bubble,
- separating the slit collapsed bubble into a first half-bubble and a second half-bubble, and
- rolling each half-bubble onto a separate master roll.
A method of forming bags from a polymeric film, the method comprising:
- forming a polymeric film tube via a blown film extrusion process,
- collapsing the polymeric film tube to form a collapsed bubble,
- separating the collapsed bubble into a first half-bubble and a second half-bubble,
- rolling the first half-bubble onto a first master roll and the second half-bubble onto a second master roll,
- placing and feeding the first master roll at a front of a bag converting line,
- ring rolling a portion of the first half-bubble to form a ring rolled portion, and
- forming bags from the ring rolled first half-bubble.
A method of forming polymeric bags, the method comprising:
- forming a polymeric film tube via a blown film extrusion process,
- collapsing the polymeric film tube to form a collapsed bubble, the collapsed bubble having a first edge and a second edge opposite the first edge,
- ring-rolling a portion of a width of the collapsed bubble forming a ring-rolled portion,
- slitting the collapsed bubble lengthwise proximate to the first edge,
- feeding the collapsed bubble into a bag converting machine,
- forming bags from the collapsed bubble.
Dependencies are inferred from the claim text.