| 摘要 |
PURPOSE:To improve yield by enabling use of a miniature extrusion machine and decreasing burrs, by holding a parison between cavities whose intermediate part is bent sideward with respect to both end parts by making the parison follow after forms of the cavities. CONSTITUTION:A parison 5 is suspended between a right and left split molds 1, 2 which are under a broken state along both end parts of cavities 3, 4 and the lower end of the parison is fixed with a fixing device 6. Then intermediate members 1c, 2c are moved along a parting line, only both the intermediate members 1c, 2c are clamped by facing cavity parts of the intermediate members 1c, 2c to the parison 5 and the parison 5 is held between the cavity parts. Then both the intermediate members 1c, 2c are moved up to the original position wherein forms of the cavities 3, 4 of both the split molds 1, 2 are coincident with each other. then the parison 5 is closed up tightly by clamping a right and left and upper and lower members 1a, 1b, 2a, 2b and blow molding is performed by introducing a pressure fluid within the parison 5. |
