METHOD OF INJECTION MOLDING
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United States of America Patent
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app pub date -
Oct 20, 2011
filing date -
Aug 25, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An injection molded article with which a sheet material is integrated is manufactured without causing damage to the sheet material. A molten resin injected into a mold cavity, passes smoothly a peripheral edge of the mold cavity, and flows into a groove portion without accumulating in the vicinity of the peripheral edge. When cooling the molten resin, the temperature of the molten resin in the groove decreases more quickly than the temperature of the molten resin in the mold cavity, because the volume of the groove portion is small. The viscosity of the molten resin is increased rapidly, preventing further molten resin from flowing into the groove portion. The sheet material in the vicinity of the peripheral edge is covered and protected against exposure to heat and/or pressure of the molten resin.
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