| 摘要 |
PROBLEM TO BE SOLVED: To provide a synthetic resin game board produced by injection molding, the game board securing transparency and translucency without damaging or remaining a pressed mark on the back side of a playfield as in a conventional one.SOLUTION: A mold surface 22 for molding the whole of the front surface of a game board 1 including a playfield 2 is formed in one mold half, core portions 23-25 for forming openings 3-7 of the game board 1, a playfield-molding mold plate 30 for molding the back side of the playfield 2, and an outer peripheral area-molding mold plate 35 for molding an outer edge rib 10 of the game board 1 are provided in the other mold half. The core portions 23-25 and the outer peripheral area-molding mold plate 35 are disposed in a manner to be moved forward and backward relative to the playfield-molding mold plate 30, the core portions 23-25 and the outer peripheral area-molding mold plate 35 are configured to be simultaneously moved backward relative to the playfield-molding mold plate 30, and the core portions 23-25 and the playfield-molding mold plate 30 are released from the game board and then the game board 1 is released from the playfield-molding mold plate. |
