| 摘要 |
PURPOSE: To accurately produce a syringe cylinder without generating a sprue by specifying the range of at least two heated jet flow paths. CONSTITUTION: At least two heated jet flow paths 31 are respectively formed to the nozzle main body 35 arranged within a range almost coaxially present with respect to a mold space 23 within the range present above a bottom 15. At this time, the jet flow paths 31 are formed so as to be terminated at the range B of the bottom 15. Uniform heat distribution is achieved by the coaxial arrangement of heating elements and, further, by ejecting a material to the range of a leading end, the heated flow paths can be shortened and the heating elements can be substantially axially arranged so as to be shifted with respect to a mold hollow space. |
