MANUFACTURING METHOD
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United States of America Patent
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app pub date -
Feb 4, 2015
filing date -
Oct 23, 2008
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Abandoned
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Abstract
A method for making products made of plastics comprises the steps of moulding a piece made of polyethylene PE, or made of polypropylene PP, and mechanically folding in a guided manner a flap portion of the aforesaid piece at a folding temperature that is greater than ambient temperature ed less than the alpha-type intermediate physical transition temperature of the material. The method reduces the spring-back of the folded portion and the yield in the folding zone.
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