| 摘要 |
PURPOSE:To provide a manufacture of a hollow molded article, by a method wherein a regulating bar regulating an inside shape of a molded article is made to keep positioned within a molding space beforehand, a parison is discharged to hold the regulating bar and blow molding is performed. CONSTITUTION:A material A for fitting parts III1, III3 and material B for a bellowslike central part III2 are supplied respectively to a first extruding machine 1 and second extruding machine 2. Either one regulating bar set 13 out of a pair of regulalating bar sets 13, 14 is moved directly below a nozzle 3 and an inside diameter regulating bar 13a is made to advance to a predetermined position of the inside of a molding space S. The first extruding machine 1 is actuated by opening a valve 8 to cast out a parison p3 abutting against the fitting part III3 and the parison p3 is made to cast out. The second extruding machine 2 is actuated by opening a valve 9 and a parison p2 abutting against the bellowslike central part III2 is made to case out. A parison p1 part abutting against the small diameter side fitting part III1 is made to cast out. A pair of molding tools 11, 12 is made to join with each other, blow molding is performed for a fixed period of time and a blow molded article in a desired shape is formed. The regulating bar 13a is made to retire by keeping a molded article III sticking to the same, a regulating bar 14a is made to advance into the molding space S instead and the molded article is made to release from the regulating bar 13a.
|
