Rigid coextruded sheet and container

Details Rigid coextruded sheet and container Rigid coextruded sheet and container

1981-10-23

1985-11-05

Ives, Patricia C.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

428516, 428517, 428520, 264515, 426127, 206557, B65D 8900, B65D 102, B32B 2728

Patent

active

045513651

ABSTRACT:
A coextruded thermoplastic sheet suitable for thermoforming into a rigid container, the sheet including a bulk layer made of a first material and a pair of bending moment resisting layers adhered to opposite surfaces of the bulk layer, the moment resisting layers being made of a second material that is more rigid than the first material, whereby the bulk layer acts to locate the second material of more rigidity at a location spaced from the neutral axis of the sheet where it efficiently resists bending moments and provides rigidity to the sheet.

REFERENCES:
patent: 3589976 (1971-06-01), Erb
patent: 3639521 (1972-02-01), Hsieh
patent: 4123576 (1978-10-01), Kobayashi et al.
patent: 4183435 (1980-01-01), Thompson et al.
patent: 4188443 (1980-02-01), Mueller et al.
patent: 4234663 (1980-11-01), Catte et al.
Standard Handbook for Civil Engineers, McGraw-Hill Company (1976) Sections 5-44 and 5-46.

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