| 摘要 |
PURPOSE:To shorten the forming cycle of a bottle made of a heat-resistant saturated polyester by specifying the area drawing magnification from a preform made of saturated polyester to a bottle, and the heat set temperature after the drawing. CONSTITUTION:When a bottle 1 made of saturated polyester consisting of a mouth tap part 2, higher quality part 3, body part 4 and bottom part is manufactured, a preform of saturated polyester is manufactured first by injection molding or extrusion molding, etc. Then, when the draw-blowing of the preform is performed, the area drawing magnification from the preform to the bottle is made to be 9 times or more (preferably, the longitudinal drawing magnification is 2, 3 times or higher, the lateral drawing magnification is 3, 4 times or higher, the lateral drawing magnification/longitudinal drawing magnification ratio is 1. 11. 7) but 15 times or less, and after the drawing, a heat set is done in a range of 80-140 deg.C. By this method, a bottle which is superior in heat- resistance can be manufactured while shortening the forming cycle. |
