CYLINDRICAL ARTICLE MADE OF FIBER-REINFORCED RESIN MATERIAL, INJECTION MOLDING MOLD THEREOF, AND INJECTION MOLDING METHOD
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United States of America Patent
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Issued Date -
Jun 22, 2017
app pub date -
May 26, 2015
filing date -
Jul 15, 2014
priority date (Note) -
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Abstract
An injection molding mold 2 where a molten resin containing reinforcing fibers is injected from a gate 11 into a cavity 5 to join the molten resins containing the reinforcing fibers together in the cavity 5 to form a weld portion. The injection molding mold 2 includes a reinforcing fiber orientation change concave portion 20 formed at a position displaced from the weld portion. The reinforcing fiber orientation change concave portion 20 opens to the cavity 5. The reinforcing fiber orientation change concave portion 20 causes the molten resins containing the reinforcing fibers 25 in the cavity 5 to partially flow into the reinforcing fiber orientation change concave portion 20 to disturb directions of the reinforcing fibers at the weld portion. Consequently, the reinforcing fibers at the weld portion and near the weld portion in the cylindrical article 1 tangle, thus improving the strength at the weld portion in the cylindrical article 1.
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