Reinforced thin wall plastic bag

Details Reinforced thin wall plastic bag Reinforced thin wall plastic bag

1973-10-15

1976-10-05

Lowrance, George E.

Envelopes, wrappers, and paperboard boxes

Wrapper

Bottle

229 53, 229 35R, B65D 3302, B65D 3100

Patent

active

039840476

ABSTRACT:
A plastic bag such as trash can liners, grass and leaf bags, sandwich bags and the like is reinforced by placing spaced ribs therein, integral with the wall structure, the ribs having a rib-to-rib spacing in the order of 1/8 to 2 cm, the ribs being peaked and merging smoothly from a projecting peak to the thickness of the walls between the ribs, the peaks extending about 1.5 to 10 times the wall thickness of the film which is, preferably, in the order of about 0.4 to 2.0 mils. Upon extrusion, the extrusion die is formed with small notches with rounded corners so that the ribs are extruded while the film material is extruded, and provide additional material in the region of the ribs which merges smoothly with the material being extruded to form the film. Such rib-reinforced bag structures may be produced by forming a continuous roll of such bags, the individual bags in such a roll being readily separated along predetermined lines of weakness.

REFERENCES:
patent: 686877 (1901-11-01), Arkell
patent: 2750631 (1956-06-01), Johnson

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