FOAMING TECHNOLOGY IN LONG GLASS FIBER FILLED MATERIALS

摘要

A foamed part, includes: a long glass fiber filled polymeric material, wherein the long glass fibers have an initial length before molding of the foamed part and a final length after molding of the foamed part; wherein a post-molding length of the long glass fibers in the foamed part is greater than or equal to a post-molding length of long glass fibers in a similarly dimensioned foamed part made without a pressurized plasticizing unit.

主权项

1. A method of making a foamed part, comprising:
introducing a long glass fiber filled polymeric material to a hopper of an injection molding machine, wherein the long glass fibers have a pre-molding length; melting the long glass fiber filled polymeric material to form a melt; pressurizing a plasticizing unit of the injection molding machine with a blowing agent, wherein a seal is located between a rotating part and a fixed part of the plasticizing unit; having a seal between the rotating and fixed parts of the plasticizing unit; sealing the plasticizing unit with an airlock mounted between a barrel of the injection molding machine and the hopper; increasing a pressure of the blowing agent and increasing a back pressure of the injection molding machine to homogenize the melt and the blowing agent; and forming the foamed part; wherein a post-molding length of the long glass fibers in the foamed part is greater than or equal to a post-molding length of long glass fibers in a similarly dimensioned foamed part made without the pressurized plasticizing unit.