MANUFACTURING OF HOLDER MADE OF SYNTHETIC RESIN

摘要

PROBLEM TO BE SOLVED: To increase the strength of a confluent part of injection resin materials with each other without increasing the number of gates as much as possible. SOLUTION: A resin reservoir 3 is formed corresponding to the confluent spot of injection resin materials at the cavity 1 of a mold and the head part of the injection resin material flows out the cavity 1 and flows in the resin reservoir 3. In a multipoint gate system, the resin reservoir 3 is formed in a state to make contact with a confluent spot in a region d1 , having a long distance in a peripheral direction in a state that a difference in length is produced between the peripheral direction distances of a plurality of regions d1 and d2 between gates 2A and 2B.