| 摘要 |
First passages are formed, so as to be continuous with bottom portions of first concave portions for vertical rib molding, at a concave portion for rib molding of a first molding die. A suction section that sucks interiors of the first passages is connected to the first passages. Further, second passages that dead-end are formed, so as to be continuous with bottom portions of second concave portions for rib molding, at the concave portion for rib molding of the first molding die. In a molding step, the first molding die and a second molding die are closed, and interiors of the first passages are sucked by the suction section, and some of a thermoplastic resin material is made to flow-in to as far as the first passages and the second passages, and the thermoplastic resin material is molded. |
