Method for producing annular moldings subjected to tensile or pressure loading from plastic
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United States of America Patent
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Issued Date -
Mar 21, 2013
app pub date -
Apr 8, 2011
filing date -
Apr 10, 2010
priority date (Note) -
Abandoned
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Abstract
The invention relates to methods for producing annular moldings subjected to tensile or pressure loading from plastic by using an injection mold having a main cavity, at least one extra cavity is incorporated in the injection mold. The at least one extra cavity is joined to the main cavity by a connecting duct. The main cavity is filled with plastic melt so a flow line is formed in the vicinity of the connecting duct between the at least one extra cavity and the main cavity, wherein the cross section of the connecting duct is dimensioned such that, during the filling of the main cavity, no plastic melt flows into the extra cavity. The filling pressure is increased until plastic melt flows into the extra cavity; flow taking place through the flow line produced during the filling of the main cavity. Subsequently, the injection mold is opened and the molding removed.
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