Injection molding method and mold mechanism
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United States of America Patent
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Jul 14, 2020
Grant Date -
May 31, 2018
app pub date -
Jan 26, 2018
filing date -
Oct 17, 2014
priority date (Note) -
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Abstract
An injection molding method includes the steps of positioning a core piece in a mold cavity through a plurality of positioning pins; injecting a molten plastic material into the mold cavity to surround and cover the core piece; maintaining the pressure inside the mold cavity at a predetermined maintaining time so that the core piece is positioned by the molten plastic material; retracting the positioning pins from the mold cavity when a predetermined retraction time is reached, so that spaces occupied by the positioning pins in the mold cavity can be filled with the molten plastic material; and completely curing the molten plastic material to form a finished product.
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