Polymer injection molding unit

Details Polymer injection molding unit Polymer injection molding unit

1996-06-26

1998-12-01

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Means applying electrical or wave energy directly to work

Radiated energy

249134, 264402, 264492, 4251744, B29C 3508

Patent

active

058434860

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.

REFERENCES:
patent: 4287931 (1981-09-01), Vogt
patent: 4652721 (1987-03-01), Miller et al.
patent: 5078947 (1992-01-01), Nishizawa et al.
patent: 5219497 (1993-06-01), Blum
patent: 5365345 (1994-11-01), Propst et al.
patent: 5456866 (1995-10-01), Kanome et al.
Mold-Making Handbook by Stockhart Chapter 11 p. 253 1983.

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