Heterogenous foam injection molding method
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United States of America Patent
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Dec 9, 1997
Grant Date -
N/A
app pub date -
Aug 21, 1996
filing date -
Sep 21, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A primary molding material is injected into a primary cavity with a predetermined volume formed by mold elements for primary injection molding which are movable relative to each other, and the mold elements are moved away from each other to increase the volume of the primary cavity by a predetermined amount. In this state, the primary molding material is foamed to form a primary molded part. Then, one of the mold elements for primary injection molding is replaced by a secondary injection mold element including a movable mold element, and a secondary molding material is injected into a secondary cavity formed by the primary molded part, the secondary injection mold element, and the movable mold element for secondary injection molding. Then, the movable mold element is moved backward to increase the volume of the secondary cavity by a predetermined amount, and the secondary molding material is foamed to form a secondary molded part as an integral part of the primary molded part, thereby producing a material or product of stable quality at low cost which simultaneously has elasticity, flexibility, cushioning properties and toughness.
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