Method of manufacturing a foam-molded product

Details Method of manufacturing a foam-molded product Method of manufacturing a foam-molded product

2005-05-17

2005-05-17

Kuhns, Allan R. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

C264S051000

Reexamination Certificate

active

06893587

ABSTRACT:
An improved method of manufacturing a foam-molded product is provided including the steps of: filling a resin containing a foaming agent into a mold cavity by injection within a time period from a time point just before completion of mold clamping to a time point after the completion of mold clamping; allowing the resin thus filled in the mold cavity to form a skin layer over a surface thereof; thereafter retracting a movable mold to define a predetermined cavity clearance between the movable mold and a stationary mold, so as to cause the foaming agent contained in an uncured portion of the resin to foam; and cooling the resin filled in the cavity mold to form a foam-molded product having a surface forming a tight skin layer and an inside portion in a foamed state.

REFERENCES:
patent: 3883629 (1975-05-01), Garner et al.
patent: 5252269 (1993-10-01), Hara et al.
patent: 5281376 (1994-01-01), Hara et al.
patent: 0 729 818 (1996-09-01), None
patent: 7-88878 (1995-04-01), None
patent: 10-180825 (1998-07-01), None

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