| 摘要 |
PROBLEM TO BE SOLVED: To provide a 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 are provided in the other mold half, a playfield-molding mold plate 30 for molding the back side of the playfield 2 is provided at the other mold half in a manner to be moved forward and backward relative to a core portion, an outer peripheral area-molding mold plate 35 for molding an outer edge rib 10 together with the playfield-molding mold plate, is provided in the other mold half in a manner to move forward and backward independently relative to the playfield-molding mold plate, the playfield-molding mold plate and the outer peripheral area-molding mold plate are protruded relative to the core portions simultaneously and integrally to open the mold, and the game board is released from the core portions, and then the outer peripheral area-molding mold plate is further protruded relative to the playfield-molding mold plate. |
