| 摘要 |
PURPOSE:To make it possible to shift a streak (weldline) to the required position by a method wherein a groove for forming a thin part is provided nearly normal to the outer peripheral line of a hole or the thin part. CONSTITUTION:A circular hole 2 is bored through a flat plate 1 forming the side or the like of an outer box. On the other hand, a resin inlet 3 is provided at one end of the flat plate 1. In addition, a thin groove 4 is provided almost normal to the outer peripheral line of the hole. Before a groove 4 is provided, resin flows through courses indicated by dash lines and, after passing through a meeting point 5, produces a streak (weldline) 7. On the other hand, after the groove 4 is provided, resin flows through courses indicated by solid lines and, after passing through a meeting point 6, produces a streak (weldline) 8. The position of the meeting point 6 changes in accordance with the length and shape of the groove 4 and the groove width of a thin part. Accordingly, the position of the streak (weldline) of resin left after the cooling of the resin can be changed and the shifting of the position of the streak (weldline) can easily be done without boring a through hole or the like in order to prevent the exposure of the streak (weldline) on a casing, on the outer design of which importance is set, from realizing. |
