Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1983-06-02
1984-05-29
McCamish, Marion
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428409, 428910, 428215, 156229, 2642107, B32B 702, B32B 900, D01D 512
Patent
active
044515243
ABSTRACT:
A polypropylene strap for use in packaging articles. The polypropylene strap has a high tensile strength, a low elongation, a high rigidity, 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 an 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: 3394045 (1968-07-01), Gould
patent: 4283453 (1981-08-01), Siefried et al.
patent: 4287249 (1981-09-01), Eustance et al.
patent: 4367511 (1983-01-01), Cross et al.
Johnson Beverly K.
McCamish Marion
Tsukasa Kasei Kogyo Kabushiki Kaisha
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