Method of making a bag with a barrier material
First Claim
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.
20 Assignments
0 Petitions
Accused Products
Abstract
A paper bag having a barrier material and a method of coating paper for use in making such a paper bag. The method comprises the steps of: continuously removing in a direction of travel a strip of paper from a source of paper at a predetermined speed; masking with a liquid impervious mask at least one longitudinal portion of the strip of paper in the direction of travel; routing the strip of paper and the mask through a bath of liquid barrier material, the liquid barrier material substantially saturating the strip of paper except for the masked portion; removing the mask from the strip of paper after moving it out of the liquid barrier material; and forming a selected length of the strip of paper into the bag. The paper bag has at least a front side and a back side each having at least one longitudinal portion extending the length of the bag. The longitudinal portion has a width less than the width of the front and back sides. A barrier coating on the front and back sides of the bag is provided except on an area of the longitudinal portions of the front and back sides.
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Citations
12 Claims
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1. A method of coating paper for use in making paper bags with a barrier material, comprising the steps of:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification