| 摘要 |
PURPOSE:To arrange so that clogging does not occur by letting a ventilating member perform a reciprocating motion according to a memorized form of a shape memory alloy during molding and non-molding. CONSTITUTION:A ventilating member 2 is fixed by a fixing part 6 in a ventilating hole provided in a molding die 1. The ventilating member 2 is composed of a ventilating member body 3, a shape memory alloy 4, a screw 5 and a fixing part 6. The form of the shape memory alloy 4 is memorized so that the ventilating member body 3 may be held in a position where the surface of the ventilating member body 3 forms part of a patterning surface at a temperature during molding when an object to be molded A is loaded into a 1. In addition, at a temperature during non-molding, the form of the shape memory alloy 4 is memorized in such a way that the ventilating member body 3 is retained in a position where said body 3 is protruded from the patterning surface. If such a state arose that a foreign matter is caught in a microclearance G threatening to cause a clogging, the ventilating member body 3 shunts once to a location where the foreign matter is entrained originally, after molding. Therefore, when the shape memory alloy is restored to its original shape during molding, the foreign matter is already removed thus eliminating a clogging. |
