Fluid compression of injection molded plastic materials

Details Fluid compression of injection molded plastic materials Fluid compression of injection molded plastic materials

B - Operations, Transporting

29

D

B29D 22/00 (2006.01) B29C 45/17 (2006.01)

Patent

CA 2412003

An injection mold apparatus having two halves, a core portion (18) and a cavity portion (16). One or more gas injection devices, such as porous metal devices (20), are located in either of the two portions of the mold. Once a charge of hot melted plastic is injected into the mold cavity, gas is injected through the opposite mold half and into any recesses and grooves. Gas seals are formed by the plastic to prevent gas in the mold cavity from reaching the plastic. The centers of mass (CM) of the plastic at rib intersections are optimally positioned to eliminate sink marks on the external finished surfaces of the molded parts.

L'invention porte sur un moule de moulage par injection présentant deux coquilles, un corps (18) et une cavité (16), ainsi qu'un ou plusieurs dispositifs d'injection de gaz, par exemple en métal poreux, placés dans l'une des deux coquilles du moule. Après l'injection du plastique fondu dans le moule, on y injecte du gaz à travers la moitié opposée au moulage et dans les évidements et rainures. Des joints étanches aux gaz formés par le plastique empêchent le gaz injecté dans la cavité d'atteindre la surface extérieure de la pièce moulée pendant le retrait du plastique. Les centres de masse (CM) du plastique au niveau des intersections des nervures sont situés de manière optimale pour éliminer les retassures de la surface extérieure finie de la pièce moulée.

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