| 摘要 |
PURPOSE:To prevent the poor caulking of a side plate from occurring and consequently reduce the rejection rate due to said poor caulking and improve the geometrical accuracy of a tape core tube by a method wherein resin is poured for molding in a gate part, which is shapedly provided on a top plate excluding caulking bosses of a tape reel part or at the position corresponding to the gate and yet near the top plate. CONSTITUTION:A recessed part 5' the volume of recess of which is determined in consideration of a gate remaining is provided on the top plate 5 of a tape reel in order to drop a gate to the part 5'. Or, in case that the direct drop of the gate onto the top plate is impossible due to the configuration of caulking bosses 7 and a central boss 6 or to the shape of a hot runner tip, a dummy boss 8 may well be provided for connecting the gate to the tip of the boss 8. In addition, the height of the dummy boss 8 must be smaller than that of the central boss 6. As for the under of gates, either single-gating or multi-gating will do. The number of gates is properly determined in consideration of the positions of the caulking bosses, the shape of the top plate and the like. Further, in case that the gate can not be dropped to the top plate, the gates may be dropped to projected parts 10, which are provided on the outer peripheral part of an inner tube 2. Furthermore, if claws for fixing retaining piece are provided on the outer peripheral part of the inner tube, the gates may be connected to the claws. |
