Shaped plastic foam part having portions of different density

Details Shaped plastic foam part having portions of different density Shaped plastic foam part having portions of different density

1997-06-12

1999-03-23

Morris, Terrel

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428158, 428218, 4283166, 264 453, B32B 312, B32B 702

Patent

active

058856935

ABSTRACT:
A three-dimensional shaped part comprises at least one first portion having an equal density throughout the volume thereof and comprising a plastic foam of a primary material having a cellular structure and plastic foam granules interconnected by the cellular structure of the plastic foam, and at least one second portion having an equal density throughout the volume thereof, the second portion being adjacent the first portion and comprising a plastic foam of a primary material having a cellular structure and elastically precompressed plastic foam granules interconnected by the cellular structure of the plastic foam. 70% to 90% of the volume of the shaped part is formed by the plastic foam granules, and the density of the second portion is greater than the density of the first portion.

REFERENCES:
patent: 3878133 (1975-04-01), Rubens
patent: 4666646 (1987-05-01), Chang
patent: 4874648 (1989-10-01), Hill et al.
patent: 5055339 (1991-10-01), Eder et al.
patent: 5135959 (1992-08-01), Hill
patent: 5422385 (1995-06-01), Farkas
patent: 5432204 (1995-07-01), Farkas

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