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Method of making a bag with a barrier material

  • US 4,798,574 A
  • Filed: 12/09/1987
  • Issued: 01/17/1989
  • Est. Priority Date: 12/09/1987
  • Status: Expired due to Term
First Claim
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1. A method of coating paper for use in making paper bags with a barrier material, comprising the steps of:

  • (a) continuously removing in a direction of travel a strip of paper from a source of paper at a predetermined speed;

    (b) masking with a liquid impervious mask at least one longitudinal portion of said strip of paper in said direction of travel;

    (c) routing said strip of paper and said mask through a bath of liquid barrier material, said liquid barrier material substantially saturating said strip of paper except for said masked portion;

    (d) removing said mask from said strip of paper after moving out of said bath of liquid barrier material; and

    (e) forming a selected length of said strip of paper into the bag.

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