Screw caps and seals for screw caps

Details Screw caps and seals for screw caps Screw caps and seals for screw caps

1994-04-25

1998-05-26

Thibodeau, Paul J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Seal, gasket, or packing

428212, 428215, 428337, 428339, 4284769, 428483, 428518, 428520, 428523, 215341, 215347, B32B 702, B32B 2508, B32B 2708, B32B 2732

Patent

active

057561788

ABSTRACT:
Composite material for seals of plastic caps, especially of screw caps, ensuring leakproofing against liquids and imperviousness to gases at the same time, characterized in that it comprises, combined in a coherent multilayer structure, at least one middle layer (4) made of a plastic substance with a gas barrier effect, with a high modulus of rigidity, two outer layers (7) arranged on either side of the middle layer and consisting of a plastic substance with a low modulus of rigidity, each of the outer layers having a thickness greater than the thickness of the middle layer, and between the middle layer (4) and each outer layer (7) an intermediate layer (5) made of a substance of the same class as the outer layer, but with a high modulus of rigidity.

REFERENCES:
patent: 4361457 (1982-11-01), Keeler et al.
patent: 4640428 (1987-02-01), Chang
patent: 4684554 (1987-08-01), Ou-Yang
patent: 4723678 (1988-02-01), Kollen et al.
patent: 4789074 (1988-12-01), Han
patent: 4846362 (1989-07-01), Schloss
patent: 4935273 (1990-06-01), Ou-Yang
patent: 5045369 (1991-09-01), Kobayashi et al.
patent: 5045594 (1991-09-01), Samuel et al.
patent: 5160687 (1992-11-01), Margaria

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