| 摘要 |
PURPOSE:To arbitrarily change the convergent position of a plurality of flow paths of resin and to easily blow-mold the dissimilar hollow bodies by forming the said flow paths of resin which are lengthened in the lower direction from the positions correspondent to the injection holes of resin on the circumferential face of a mandrel and forming convergent parts in the direction of the flow paths of resin and communicating the inflow paths of resin with the flow paths thereof in the upper ends of the above-mentioned flow paths of resin. CONSTITUTION:A main flow path 5 of resin and an auxiliary flow path 6 thereof which are formed of recessed grooves lengthened in the vertical direction are formed on the circumferential face of a mandrel 2. The injection paths 9, 10 of resin which are formed of the recessed grooves lengthened in the direction of the circumferential face from the upper ends of the main flow path 5 of resin and the auxiliary flow path 6 thereof are formed on the mandrel 2. The injection paths 9, 10 are integrally communicated with both directions from the upper ends of the main flow path 5 and the auxiliary flow path 6 in a range of 180 degrees at 90 degrees by 90 degrees. A main injection hole 11 of resin is communicated with the injection path 9 of the main flow path 5. Further an auxiliary injection hole 12 is communicated with the injection path 10 of the auxiliary flow path 6. Accordingly the convergent positions of resin are arbitrarily changed by only changing the angle of rotation of the mandrel 2. Thereby the hollow bodies having a different mode can be obtained. |
