Method for making a heavy duty bag having an easy opening spout
AssigneeBonar Packaging, Inc.
InventorGregory B. Smiley
Life of this patent
Estimating the term…
Abstract
A plastic, heavy duty bag having an easy opening pouring spout, and a method and apparatus for forming a plastic, heavy duty bag having an easy opening pouring spout are disclosed. The bag includes a radially disposed perforation in the upper corner of the bag. Above a heat sealing strip, a slit is formed in the portion of the bag extending above the heat sealing strip, to aid in tearing through the heat seal strip to gain access to the perforation.
Claims14
A method for making a plastic, heavy duty bag, adapted to be filled with a desired product, comprising the steps of:
- (a) forming a tubular shaped member of low density polyethylene plastic having a thickness of approximately 4 to 8 mils;
- (b) flattening the tubular shaped member to form a front wall, having first and second ends and first and second side edges, and a rear wall having first and second ends and first and second side edges;
- (c) joining the front and rear walls to each other adjacent their first ends by heat sealing together a portion of the front wall to the rear wall to provide an integral heat sealing strip disposed substantially parallel to, and spaced from, the first ends of the front and rear walls, and providing a skirt portion of each of the first ends of the front and rear walls extending above the heat sealing strip;
- (d) forming a perforation in the front and rear walls extending from the heat sealing strip to the second side edges, the perforation being substantially radially disposed from a location where the first ends and second side edges intersect;
- and
- (e) forming a slit in each of the skirt portions of the front and rear walls, the slits only extending from the first ends of the front and rear walls to the heat sealing strip, the slit being disposed substantially perpendicular to the heat sealing strip and in alignment with a portion of the perforation disposed adjacent the heat sealing strip, whereby upon pulling the skirt portions adjacent the slit, the heat sealing strip may be tom through, and further pulling separates the perforation to provide a pouring spout in the bag.
A method for making a plastic, heavy duty bag, adapted to be filled with a desired product, comprising the steps of:
- (a) forming a tubular shaped member of low density polyethylene plastic having a thickness of approximately 4 to 8 mils;
- (b) flattening the tubular shaped member to form a front wall, having first and second ends and first and second side edges, and a rear wall having first and second ends and first and second side edges;
- (c) forming a perforation in the front and rear walls extending from a first location adjacent the first ends of the front and rear walls to the second side edges, the perforation being substantially radially disposed from a second location where the first ends and second side edges intersect;
- (d) forming a slit in the first ends of the front and rear walls only extending from the first location to the first ends of the front and rear walls, the slit disposed in alignment with a portion of the perforation disposed adjacent the first location;
- (e) joining the front and rear walls to each other adjacent their first ends by heat sealing together a portion of the front wall to the rear wall to provide an integral heat sealing strip disposed substantially parallel to, and spaced from, the first ends of the front and rear walls, and providing a skirt portion of each of the first ends of the front and rear walls extending above the heat sealing strip, the slits being disposed in the skirt portions, whereby upon pulling the skirt portions adjacent the slit, the heat sealing strip may be tom through, and further pulling separates the perforation to provide a pouring spout in the bag.
Dependencies are inferred from the claim text.