Method of making an inverted-hook groove for a plant-fiber molded cup lid
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United States of America Patent
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Dec 2, 2014
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app pub date -
Jul 23, 2009
filing date -
Jul 23, 2009
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Abstract
A method of making an inverted-hook groove for a plant fiber-molded cup lid is to form an inverted-hook groove on a side surface of a plant-fiber molded cup lid, which has already been thermally compressed and shaped, processed and shaped once more to form an inverted-hook groove at the side surface of the molded cup lid so that the molded cup lid with the inverted-hook groove can be tightly and closely combined with the upper edge of a primary cup body. The method of making an inverted-hook groove for a plant-fiber molded cup lid of this invention is classified into three kinds; a method of compression shaping directly, a method of roller compression shaping and a method of air bag compression shaping.
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