B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/682
B29C 45/13 (2006.01) B29C 45/17 (2006.01)
Patent
CA 1292348
METHOD FOR INJECTION MOLDING APPARATUS THEREFOR AND MOLDINGS PRODUCED THEREBY Abstract of the Disclosure A process for producing an injection molded product includes introducing a stream of plastic material into a mold space at a first pressure. A quantity of gas is stored in a storage chamber at a second pressure which is at least as high as the first pressure. The gas is introduced into the molten stream of plastic material immediately after the molten material has passed the position at which the gas is introduced thereby forming a gas cavity in the molten material. The gas exerts pressure on he surrounding plastic material to urge the material toward the surfaces of the mold space. As the feeding of the plastic material into the mold space continues, the injection of the gas is also continued. The supply of molten material is terminated when the surfaces of the mold space are completely covered by the molten material. The pressure within the gas cavity is subsequently maintained as the plastic material cools. An apparatus for producing an injection molded product is also disclosed.
536273
Baxi Indra K.
Sim & Mcburney
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