| 摘要 |
PURPOSE:To provide a molding die for a thermosetting resin which can shorten the molding cycle to a large extent by setting the temperature difference between the small diameter nozzle touching side of a sprue bush as the low temperature side and the large diameter sprue locking side as the high temperature side. CONSTITUTION:A heater 4 is wound densely on an end of the sprue block side 2 of a sprue bush 1, which is on the outer periphery in the vicinity of an end of large bore of a sprue 34 of the sprue bush 1, while a heater 4 is wound with the medium density between sparse and dense on the outer periphery in the vicinity of a central section of the sprue bush 1. The heater 4 is wound sparsely in the vicinity of the end of the small bore of the sprue 34, while the heater 4 is wound densely in the vicinity of the end of large bore of the sprue 34. The vicinity of the end of small bore of the sprue 34 is heated at a low temperature, while the vicinity of the end of large bore of the sprue 34 of the sprue bush 1 is heated at a high temperature by the arrangement. |
