| 摘要 |
A mold having a molding cavity and a plurality of gates for injecting molding material into the cavity is prepared. The mold has a leakage suppressing portion for suppressing leakage of the molding material to a clearance of the mold. The gates include gates of different distances from the leakage suppressing portion. As the molding material, a material the fluidity of which is a spiral flow length of 20 to 70 cm is prepared. The injection pressure of the molding material from the gates of the different distances from the leakage suppression portion is equalized. The gate that is farther from the leakage suppressing portion is caused to first start injecting the molding material into the molding cavity.
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