Polypropylene strap and method of manufacturing the same

Details Polypropylene strap and method of manufacturing the same Polypropylene strap and method of manufacturing the same

1983-10-26

1985-03-05

Hayes, Lorenzo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642105, 264234, 264345, D01D 512

Patent

active

045030073

ABSTRACT:
A polypropylene strap for use in packaging articles. The polypropylene strap has a high tensile strength, a low elongation, a high ridigity, a high abrasion resistance, and flexible surfaces, and it is not easily split in the longitudinal direction. This strap has superficial layers stretched at a low draw rate of 1.2-3, and a inner portion stretched at a high draw rate of 10-18. The total thickness of the superficial layers is 5-50% of the total thickness of the strap. The strap is manufactured by stretching a belt-like material, which has been extruded from a die, in the lengthwise direction thereof at a volume ratio of 4-9, heating the surfaces of the resulting belt-like material to put the molecular chains in the superficial layers only thereof in a non-oriented state, and then stretching the belt-like material as a whole at a draw ratio of 1.2-3.

REFERENCES:
patent: 3324217 (1967-06-01), Armstrong et al.
patent: 3394045 (1968-07-01), Gould
patent: 3432590 (1969-03-01), Papps
patent: 3651196 (1972-03-01), Starkweather, Jr.
patent: 3800008 (1974-03-01), Starkweather, Jr.
patent: 4101625 (1978-07-01), Haley

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