Method of forming foam moldings having varied density regions

Details Method of forming foam moldings having varied density regions Method of forming foam moldings having varied density regions

1992-05-06

1993-10-12

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 451, 264 51, 264126, B29C 6722

Patent

active

052522709

ABSTRACT:
Moldings made from polyolefin particle foams having a mean density of from 0.015 to 0.100 g/cm.sup.3 and having at least two different regions whose densities differ by from 0.005 to 0.030 g/cm.sup.3 have a transition zone between the different density regions having a thickness of not more than 25 mm. A method of forming the moldings, using removable mold dividing walls, is described.

REFERENCES:
patent: 3919370 (1975-11-01), Cotterell
patent: 4031179 (1977-06-01), Tatzel et al.
patent: 4206166 (1980-06-01), Hayashi et al.
patent: 4608213 (1986-08-01), Kurumizawa et al.
patent: 4756859 (1988-07-01), Cretti
patent: 5085814 (1992-02-01), Kamiyama et al.
patent: 5143664 (1992-09-01), Noguchi et al.

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