Polymer injection molding unit
AssigneesYasuo Kurosaki, The Rexroth Corporation
InventorsYasuo Kurosaki, Isao Sato
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Abstract
A polymer injection molding unit is disclosed having a mold wall which includes a portion made of an infrared transmissible material which is radiated by an external infrared radiation source. Due to the passage of the infrared radiation through the infrared transmissible material, the infrared radiation is not absorbed by the mold wall and the mold wall is not substantially heated. The infrared radiation passes through the mold wall and is absorbed by the molten polymer material near the mold wall. As a result, the temperature of the molten polymer material rises and its viscosity is lowered to thereby enhance the shape transcription of complicated or fine shapes present on the mold wall, without increasing the temperature of the mold wall.
Claims3
A polymer injection molding unit comprising:
- a metallic mold provided with mold walls defining a mold cavity,
- at least one low transcription area present on said mold walls and made of an infrared transmissible material without substantial energy absorption, and
- an external infrared radiation source attached to said metallic mold in an arrangement to radiate a polymer material in the vicinity of said low transcription area during polymer injection molding to thereby affect the temperature of said polymer material without substantially affecting the temperature of said infrared transmissible material.
Dependencies are inferred from the claim text.