| 摘要 |
PURPOSE:To provide the manufacture through a simple blow molding method of a synthetic resin vessel, in which the upper end surface of a vessel mouth section is formed into a slant face downward-tilted toward a vessel bottom with forwarding from the outer circumference of the upper end face to the center of the vessel and an angle formed by said upper end face and the outer circumferential surface of said mouth section continued to said upper end face is acute. CONSTITUTION:A blow molding die 1 with a section 11 holding the upper end section of a parison 3 and a mouth section 14 continuously upward from the section 11 and gradually expanded upward and, then, erected upright and a driving pin 2 for gas blowing with a section 21 inserted into the upper end section of the parison 3 and a shoulder section 22, which is continuously upward from the section 21 and a diameter of which is gradually increased upward in the same or approximately the same inclination as the inclination of the slant face section of said molding die mouth section, are prepared. The parison 3 is held and mold-clamped by the blow molding die 1, the inserting section 21 of the driving pin 2 is inserted to the upper end section of said parison while the parison upper end section is pushed against the molding die mouth section 4 as being expanded by the shoulder section 22, and a gas is blown into the parison. |
