Degating method
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United States of America Patent
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Dec 3, 1991
Grant Date -
N/A
app pub date -
Oct 17, 1990
filing date -
Oct 25, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for degating an injection molded plastic article includes the steps of filling a mold cavity with a molten plastic, dwelling and cooling the mold subsequent to filling to effect gate seal. A first degating punch and a second punch are provided slidably inserted in holes in the mold which cross a gate in an axial direction, being the direction in which a movable mold half is opened and closed. The punches are vibrated at a high frequency after gate seal is completed in order to soften the solidified plastic in the gate. The punches are then displaced with respect to the gate when the plastic is softened in order to effect degating. In another method, a step of cutting the gate in the molded article by sliding the punches occurs during both dwelling after filling the mold with the molten plastic, and cooling subsequent to the completion of dwelling, and before gate seal is effected. While the punches are subject to vibration with high frequency or slow reciprocating motion, the side surfaces of the punches are contacted against the degated surface to obtain a good cut surface on the molded article.
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