| 摘要 |
PURPOSE:To reduce the deflection of a mandrel support bar, and to manufacture a uniform pipe by treating a pipy article which is not drawn, consisting of an extrusion-molded synthetic resin cut in standard size through a process composed of preheating, drawing blow molding, thermal fixing and cooling. CONSTITUTION:A large number of pipy articles 16 which are not drawn and in standard size are stored into a hopper 17, and a required number of the articles are fed every time when a conveyor 18 for a preheating section is moved intermittently. The pipy article which is not drawn is fed intermittently for a fixed time in a heating apparatus 19 for the preheating section from a position 16, and preheated at a drawing blow-moldable proper temperature and reaches a position 16a. The pipy article is pressed by a top force 23 by a hydraulic cylinder 24 at a position 16c, and drawn in the axial direction by a hydraulic cylinder 40 while compressed air is sent in from a fluid blowing port 37, and the pipy article is drawn until it is fast stuck to a bottom force 22 and the top force 23 in the radial direction. The forces 22, 23 are heated at a fixed temperature at that time, and the pipy article is thermally fixed. Thermal fixing is completed, and the drawn pipy article 25 is turned together with a rotary plate 21 and stopped at the position of a cooling section 25a.
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