Journal
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
Volume 24, Issue 1, Pages 149-152Publisher
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-009-1127-4
Keywords
High-frequency induction heating; Injection molding; Rapid mold heating; Weldline
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High-frequency induction is an efficient way to heat mold surface by non-contact electromagnetic induction. It has been recently applied to injection molding because of its capability to heat and cool mold surface rapidly. This Study applies high-frequency induction heating to eliminate weldlines in an injection-molded plastic part. To eliminate or reduce weldlines, the mold temperature at the corresponding weld locations should be maintained higher than the glass transition temperature of the resin material. Through 3 s of induction heating, the maximum temperature of 143 degrees C is obtained on the mold surface around the elliptic coil, while the temperature of the mold plate is lower than 60 degrees C. An injection molding experiment is then performed with the aid of induction heating, and the effect of induction heating conditions on the surface appearance of the weldline is investigated. The weldline on the heated region is almost eliminated, from which we can obtain the good surface appearance of the part.
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