| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold for reaction injection molding, in which reaction liquid is uniformly force-fed into a cavity and nonconformity such as generation of an unfilled part and generation of a void (a defect) due to entrainment of air is previously prevented. SOLUTION: In the mold for reaction injection molding, when a pair of molds consisting of a projected mold 1 and a recessed mold 2 are matched, a nearly T-shaped introduction part 3 of reaction liquid is formed, in which the same consists of a sprue part 4, a runner part 5 and a gate part 6 in order from an inlet side. The gate part 6 is a flat film shape and the shape of the opening part of the gate part 6 directed to the cavity side is not the opening part having constant width till reaching the end part from the center part but formed so as to become narrowly in the center part and become widely in the end part.
|
