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Method of film crease elimination and patch bag without crease within lay-flat bag side

  • US 6,296,886 B1
  • Filed: 03/17/1997
  • Issued: 10/02/2001
  • Est. Priority Date: 03/17/1997
  • Status: Expired due to Fees
First Claim
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1. A process for making a patch bag, comprising:

  • (A) adhering a patch to a first lay-flat side of a film tubing while the tubing is in a first lay-flat configuration, whereby a lay-flat tubing-patch laminate is formed, the lay-flat tubing having a first crease along a first side edge and a second crease along a second side edge;

    (B) passing the lay-flat tubing-patch laminate through a first pair of nip rolls with the tubing being inflated by a trapped bubble of gas between the first pair of nip rolls and a second pair of nip rolls, whereby an inflated tubing-patch laminate is formed;

    (C) heating a first region of the inflated tubing-patch laminate which contains the first crease, and a second region of the inflated tubing-patch laminate which contains the second crease, the heating being carried out so that each of the creases is removed;

    (D) cooling the first and second regions of the inflated tubing-patch laminate;

    (E) deflating and flattening the inflated tubing-patch laminate into a second lay-flat configuration by passing the inflated tubing-patch laminate through the second pair of nip rolls which have a nip which is oriented from about 10 to 90 degrees off-parallel relative to a nip of the first pair of nip rolls, so that a reconfigured lay-flat tubing-patch laminate is formed in which the patch covers a segment of a first new side edge of the tubing; and

    (F) sealing and cutting the reconfigured lay-flat tubing-patch laminate in the second lay-flat configuration so that the patch bag is formed from a segment of the tubing having the patch adhered thereto.

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