| 摘要 |
PROBLEM TO BE SOLVED: To prevent an outward appearance dimension from changing by keeping the temperature of the side, which comes into contact with a parison, of a forming tube constant both in summer and in winter seasons by a method wherein a pipe passage for flowing cooling water is provided on the surface of or within the forming tube. SOLUTION: A pipe passage 2 for cooling water is provided on the wall surface on the opposite side of the contact surface with a parison of a forming tube 1. The pipe passage for cooling water passes the water cooled with a cooling tower, a chiller or the like through a forming tube portion and sends back again to the cooling tower, the chiller or the like. The pipe is made of metals such as copper, bronze stainless steel, aluminum, iron or the like, synthetic resins such as nylon, teflon, polyethylene or the like and has a preferable inner diameter of about 5 to 8 mm. The arrangement of the pipe passage at the forming tube is a spiral arrangement wound around the forming tube, a forward and backward arrangement along the wall surface of the forming tube or the like.
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