Method of manufacture of a foamed core class...

Details Method of manufacture of a foamed core class... Method of manufacture of a foamed core class...

2009-03-26

2011-11-01

Johnson, Christina (Department: 1742)

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

C264S051000

Reexamination Certificate

active

08048347

ABSTRACT:
The method of manufacturing an article having a surface, a skin, and a core includes closing a first mold portion on a compressible seal. The seal is disposed between the first and second mold portions. The portions define a pressurizable mold cavity having a spaced apart injection port and a vent. The mold cavity is pressurized at a first pressure greater than atmospheric pressure. Molten plastic and blowing agent are injected form gas cells within the mixture. The gas cells have an internal pressure exceeding the first pressure. After waiting for a first period, the pressurizing gas is vented for a second period at a rate sufficient to rupture the gas cells which form a skin adjacent to the mold cavity wall. The skin defines a core cavity filled with the foamed mixture, which is solidified. The mold portions are separated releasing the article.

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