Process to increase the resistance to tearing of a heat-resettab

Details Process to increase the resistance to tearing of a heat-resettab Process to increase the resistance to tearing of a heat-resettab

1994-04-22

1996-01-02

Hamilton, III, Thomas

Stock material or miscellaneous articles

Hollow or container type article

Shrinkable or shrunk

2642096, 2642097, 2642105, 264230, B29C 5500, B29C 6102, B65B 5302, D01D 512

Patent

active

054806925

ABSTRACT:
A process to increase resistance to tearing in a heat-resettable material involves extruding a polymer of a specified crosslinking density to produce a plastic web. After cooling the plastic web is heated by creating a temperature decreasing towards its core and stretched at core temperature below crystalline melting temperature of partially crystalline and crystalline polymers resulting in a distribution of orientation over the full section of the plastic web. Resistance to tearing will be essentially increased in this manner based on a simple, low-cost production process.

REFERENCES:
patent: 4354997 (1982-10-01), Mizutani et al.
patent: 4436888 (1984-03-01), Copple
patent: 4705657 (1987-11-01), Poulin
patent: 4797235 (1989-01-01), Garland et al.
patent: 4957790 (1990-09-01), Warren
patent: 5043383 (1991-08-01), Eaton et al.
patent: 5106545 (1992-04-01), Warren
patent: 5127977 (1992-07-01), Eaton et al.

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