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Resin/resin Bonding Strength and Control of Interface Geometry in Simultaneous Composite Injection Molding

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Tomari, Kiyotaka / Sawada, Satoshi / Nakano, Ryo / Hamada, Hiroyuki / Maekawa, Zenichiro

A simultaneous composite injection molding (SCI. molding) process has been developed based on a conventional two color injection molding process. This is a new process of composite parts in which two different melts are injected into one mold cavity simultaneously through two channels. It has outstanding advantages of high resin/resin bonding strength and low production cost compared with the conventional method.
In the present paper, the resin/resin bonding strengths of ABS/ABS, PBT/PBT and ABS/PBT composite molding produced by SCI. molding are compared with those from the conventional injection molding. The optimum control methodologies of the interface geometry are discussed.

Key words: Two color injection molding / Composite processing / Weldline / Bonding strength

Seikei-Kakou, Vol.5, No.3, pp.197-204 (1993), Copyright (C) JSPP 1993-