Injection molding of tubular plastic products
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United States of America Patent
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Jan 30, 2007
Grant Date -
N/A
app pub date -
Mar 31, 2004
filing date -
Mar 31, 2004
priority date (Note) -
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Abstract
A hollow plastic product with a substantially tubular section, two open ends and a thread at the outside of one end of the product is manufactured by injection molding a plastic product with a substantially tubular section, an open end, a closed end and a thread at the outside of the closed end. An inner core of the core mold part is retracted from within the end of the mold cavity in which the thread is formed so that when the molded product is removed from the cavity mold part, the neck is compressed to partially occupy the region vacated upon removal of the inner core, whereby the thread is removed without damaging the thread. Removal of the molded product from the core mold part is at least helped by injecting compressed air into the closed end of the product. The closed end is then opened.
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