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US 5,393,293 AGranted
Method and apparatus for forming a shrinkable bag having an integral handle
AssigneeViskase Corporation
InventorsPhilip F. Cilia, Vytautas Kupcikevicius
Life of this patent
Estimating the term…
Abstract
Bag making apparatus and method for forming a handle opening in a thermoplastic food packaging shrink bag includes both cold cutting and hot cut cutting operations to form a handle which, on heat shrinking the bag, is strong and has an enhanced appearance.
Claims14
Apparatus for forming a handle opening in a bag composed of a heat shrinkable thermoplastic material comprising:
- a) an anvil having a surface for receiving said bag in a lay-flat condition wherein a front and a rear bag panel are superimposed one on another;
- b) a knife movable towards said anvil for cold cutting a transverse slit through both of said bag panels;
- and
- c) means for burning segments through the panels at each end of said cold cut slit thereby extending the length of said cold slit and welding said panels together along said segments.
1 more element
A method for forming a handle opening in a bag composed of a heat shrinkable thermoplastic material comprising the steps of:
- a) arranging said bag in a lay-flat condition wherein a front panel of said bag is superimposed over a rear panel of said bag;
- b) cold cutting a transverse slit through a portion of both of said panels;
- and
- c) burning a segment through both of said panels at each end of said slit to extend the length of said slit and to weld said panels together along said segments.
1 more element
Dependencies are inferred from the claim text.