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桶、罐、瓶等中空塑料制品,通常用吹塑工艺生产。加热软化的塑料,从吹塑机的料口中挤出,形成一个管状坯料。在坯料尚未冷却之时,夹入模具,进行吹制,待塑料冷却定形,制品便制成了。在吹塑过程中,各种形状的制品,其坯料各部分的变形量各不相同,则吹塑制品壁厚不易一致,变形大的部位,壁厚较薄,变形小的部位,壁厚较大,如图1(a)所示。为
Barrels, cans, bottles and other hollow plastic products, usually blow molding process. The softened plastic is heated and extruded from the mouth of the blow molding machine to form a tubular blank. In the blank has not yet cooled, sandwiched mold, blowing, to be plastic cooling set, the products will be made. In the blow molding process, the various shapes of the products, the deformation of the various parts of the blank vary, the blow wall thickness is not easy to uniform, large deformation of the site, the wall thickness is thin, small deformation of the site, the wall thickness of more Large, as shown in Figure 1 (a) below. for