Improved thermoplastic resin molding process

Details Improved thermoplastic resin molding process Improved thermoplastic resin molding process

B - Operations, Transporting

29

C

B29C 35/00 (2006.01) B29C 45/72 (2006.01) B29C 45/73 (2006.01) B29C 49/48 (2006.01) B29C 49/64 (2006.01) B29C 51/42 (2006.01) B29C 33/02 (2006.01) B29C 35/02 (2006.01) B29C 35/16 (2006.01)

Patent

CA 2122385

Abstract of the Invention This invention is directed to an improved molding process for producing molded articles by either extrusion blow molding, thermoforming or injection molding, which process continually replicates the mold cavity surface. The improved process of this invention comprises heating the mold cavity surface to a temperature below the softening temperature of the thermoplastic resin, bringing the thermoplastic resin into contact with the mold cavity surface while venting the air therebetween, heating the mold cavity surface to a temperature that peaks above the softening temperature of the thermoplastic resin, cooling the mold cavity surface from the peak temperature to a temperature below the softening temperature of the thermoplastic resin, continue cooling until the molded article is sufficiently rigid for removal from the mold, and then removing the molded article from the mold.

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