| 摘要 |
PROBLEM TO BE SOLVED: To securely fill a molten resin in every corner, even in thin wall parts. SOLUTION: In a cavity side half of a molding tool, a gate 13 is arranged at an opposite position to the corner of a cavity 3 and also at a position where the end of a side wall 32 of a shaped molded product 30 exists, that is, a position where the four corners existing at the end of the side wall 32 are formed respectively. Thus, the gate 13 is of almost a triangular shape That is, the gate 13 is designed so that the corner where the side walls 32 of a box-shape molded product 30 cross each other, represents the largest center 13a in the cavity 3 and both sides of the center 13a extend along the mutually adjacent side walls 32, forming an isosceles. Consequently, a molten resin circulation from the side wall 32 side to a top plate 31 side takes place rapidly and successively.
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