Method and apparatus for fluid compression of injection...

B - Operations – Transporting – 29 – C

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B29C 45/57 (2006.01) B29C 45/17 (2006.01) B29C 45/18 (2006.01)

Patent

CA 2225870

A mold apparatus and method is used to form a solid injection molded plastic part having no internal voids, a Class A finish, a sink-free exterior appearance surface, and unevenly distributed structural detail extending from the opposite surface, the detail including free-standing reinforcement ribs, attachment bosses, and the like, In sequence, a seal groove in the mold cavity is reduced to a pressure below atmospheric (i.e., negative), a charge of hot thermoplastic is introduced into the mold cavity and seal groove whereby to form a gas seal ring, and pressurized gas is injected into the mold cavity, The pressurized gas forces the hot plastic from one mold half against the other mold half, and the gas seal formed by the plastic prevents gas on one side of the thermoplastic from reaching the appearance surface of the part.

Appareil et méthode de moulage utilisés pour former une pièce plastique solide moulée par injection ne comprenant aucun vide interne, mais un fini de Classe A, une surface extérieure libre de dépression et un détail structural distribué de façon non uniforme se prolongeant à partir de la surface opposée, le détail incluant des nervures de renforcement libres, des bossages de fixation et d'autres détails semblables. Dans l'ordre, une rainure d'étanchéité de la cavité du moule est réduite à une pression plus basse que la pression atmosphérique (c'est-à-dire négative), une charge de thermoplastique chaud est introduite dans la cavité du moule et la rainure d'étanchéité de façon à former un anneau d'étanchéité du gaz, et du gaz sous pression est injecté dans la cavité du moule. Le gaz sous pression force le plastique chaud d'une moitié du moule contre l'autre moitié, et l'anneau d'étanchéité formé par le plastique empêche le gaz sur un côté du thermoplastique d'atteindre la surface extérieure de la pièce.

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