| 摘要 |
PROBLEM TO BE SOLVED: To prevent the lowering of the adhesive strength of an interface caused by a thin wall and the formation of a weld line and defective appearance by arranging a runner and a gate in the shape of a ring along the inside opening part of a toilet seat. SOLUTION: A resin is packed from an inlet and induced along the inside of a toilet seat opening part via ring runner passing through a sprue 5 and a primary runner 4. The resin is introduced into a toilet seat main body 1 radially from the inside of the toilet seat opening part in a uniform thickness at a film gate 2. Since the distance from the toilet seat opening part to the outside of the toilet seat can be shortened, thin wall molding is made possible. The resin, which penetrated into the whole inside of the toilet seat by the ring runner 3, is passed through a tunnel gate to be introduced into the toilet seat main body 1 through a sacrifice gate. The joint between the tunnel gate and the sacrifice gate is broken when removed from the mold, the sacrifice gate is cut at the joining point of the toilet seat main body 1, and molding is completed. In this way, the shortage of strength owing to a thin wall and a weld line wain and defective appearance can be prevented.
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