Process for producing a composite sheet

Details Process for producing a composite sheet Process for producing a composite sheet

1989-08-25

1990-11-27

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624411, 428516, B29C 4704

Patent

active

049733753

ABSTRACT:
A packaging structure composed of a composite synthetic resin sheet having a depressed portion formed therein for holding an article and a metal foil bonded to the sheet, said composite sheet being a three-layer sheet composed of an interlayer of high-density polyethylene and outside layers of a propylene polymer bonded to both surfaces of the interlayer, the interlayer having a thickness of 120 to 800 micrometers, each of the outside layers having a thickness of 15 to 80 micrometers, and thickness of the interlayer being at least 2.5 times the total thickness of both outside layers; a process for production thereof; and a process for producing a composite (synthetic) resin sheet suitable as a material for the aforesaid packaging structure.

REFERENCES:
patent: 4126262 (1978-11-01), Thompson et al.
patent: 4252851 (1981-02-01), Lansbury et al.
patent: 4460631 (1984-07-01), Stegmeier et al.
patent: 4574104 (1986-03-01), Aishima et al.

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