Method of manufacture of a foamed core class "a" article

Details Method of manufacture of a foamed core class "a" article Method of manufacture of a foamed core class "a" article

B - Operations, Transporting

29

C

B29C 44/08 (2006.01) B29C 44/16 (2006.01)

Patent

CA 2719696

The method for 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 a 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 mix-ture, which is solidified. The mold portions are separated releasing the article.

La présente invention concerne un procédé de fabrication dun article ayant une surface, une peau et un noyau comprenant la fermeture dune première partie de moule sur un joint compressible. Le joint est disposé entre les première et seconde parties du moule. Les parties définissent une cavité de moule pressurisable ayant un orifice déjection espacé et un évent. La cavité de moulé est pressurisée à une première pression plus grande que la pression atmosphérique. Un plastique et un agent de soufflage sont injectés pour former des cellules de gaz au sein du mélange. Les cellules de gaz ont une pression interne dépassant la première pression. Après attente dune première période, le gaz de pressurisation est éventé pendant la seconde période à une vitesse suffisante pour rompre les cellules de gaz qui forment une peau adjacente à la paroi de la cavité de moule. La peau définit une cavité de noyau remplie du mélange mousse, qui se solidifie. Les parties de moule sont séparées, libérant larticle.

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