| 摘要 |
PURPOSE:To mold a bottle having an extremely high heat resistance against heat contraction by producing primary intermediate molding product out of the preform formed as desired by means of the biaxially oriented blow molding under the specified temperature, heat treating under specified temperature into the secondary intermediate molding product by means of heat transformation, and blow molding the said secondary intermediate molding product into a bottle. CONSTITUTION:The process of molding the preform 1 into the primary molding product 4 by means of the biaxially oriented blow molding is carried out under a temperature heated up to 90 deg.C-130 deg.C in which elongation effect including temperature value 120 deg.C just before heat crystalization of PET can be achieved. The process of molding the secondary intermediate molding product 5 into the bottle 6 is carried out by blow molding the secondary intermediate molding product 5, heated up to 170 deg.C-255 deg.C and heat contracted into the bottle 6, with the secondary blow mold heated up to 120 deg.C-150 deg.C, higher by several degrees than the maximum atmospheric temperature in which the bottle 6 to be molded is actually used. The bottle 6, heat set with the secondary blow mold heated up to high temperature, is free from inner residual stress and of high heat resistance. |
