Method for rapid mold heating and cooling

Details Method for rapid mold heating and cooling Method for rapid mold heating and cooling

2005-01-25

2005-01-25

Colaianni, Michael P. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to heat the...

Electrical heating

C264S402000, C264S328160

Reexamination Certificate

active

06846445

ABSTRACT:
A method for rapidly heating a mold cavity to a predetermined temperature preferably above the softening or melting temperature of the molding material prior to and during the molding stage thereby increasing moldability and improving quality of molded parts. The mold cavity is formed by two metallic halves on which high-frequency electric current is applied and an electric circuit involving the two halves is formed. Due to the proximity effect, the electrical current flows on the inner surfaces of the two cavity halves, thus rapidly heating the mold cavity. Proper use of insulation behind the cavity surface helps increase heating efficiency. Conformal on-off cooling channels provide both thermal insulation during the heating phase and rapidly cooling of the molded article during the cooling phase.

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