| 摘要 |
Tubular bodies are extruded from thermoplastic material by forming a tubular preform at an exit of an extruder head die after which the tubular preform is then blown to the configuration of a cavity of a blow mold. The position of the preform relative to the blow mold is regulated and/or controlled, and waste portions produced in the blow mold are separated from the blown hollow body. The weight of the separated lower waste portions and/or the net weight of the hollow body when in accumulation head operation is measured in order to control and/or regulate the position of the preform and to change the die slit in the event of a weight deviation from a reference value. With respect to continuous extruder operation of an extruder head, either the hollow body net weight and the weight of the lower waste portions are measured and compared with reference values or the positions of markings relative to particularly critical cross-sectional zones are compared with present reference values to derive appropriate position control and/or regulation of the preform.
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