中空成品成型机道理为“挤—吹”成型。挤出机均接纳变频机电调速，既可取得大的调速规模以知足差别成品的请求，又能够或许使挤出型坯相称不变，以保障产物分量的同一。挤出机塑化的熔融塑料经挤出机头组成型坯，型坯进入模具吹塑成型，即实现一个轮回。今朝市场上的中空吹塑装备有大机型和小机型。小机型里又分单工位和双工位。双工位任务时，摆布工位各实现一个任务进程算一个轮回。

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