Method of injecting plastic material using a plastic...

Details Method of injecting plastic material using a plastic... Method of injecting plastic material using a plastic...

B - Operations, Transporting

29

C

18/641, 18/683

B29C 45/00 (2006.01)

Patent

CA 1059714

METHOD OF INJECTING PLASTIC MATERIAL USING A PLASTIC INJECTION MACHINE Abstract of the Disclosure A method of injecting plastic material into the cavity of a mold is disclosed which method is particularly useful for the injection of foam-type plastics and/or the injection into a mold cavity which contains certain fill pieces, inserts or the like, which may be moved or disturbed in their position by high pressure injection. The method includes the prepres- surization of the plastic material within the injection cylinder to a relatively low pressure, opening the nozzle valve on the cylinder at the conclusion of the very short time interval and injecting the plastic material at the low pressure over a second time interval to effect a controlled injection of the plastic material. After the material has been injected, a third time interval is established throughout which a substantially higher pressure is applied to the plastic material to set up the foam material, to provide a uniform homogeneity of the product, and to insure complete and full filling of the mold without dis- turbing any delicate inserts which may have been within the mold cavity.

233374

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