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AssigneesKao Corporation, Tahara Machinery Limited
InventorsTokuji Noguchi, Masashi Yano, Masayuki Akimoto, Mitsuo Yamanoi, Minoru Ohizumi
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A parison length control method for a blow molding machine in which a parison is extruded vertically, the end of the parison is closed, and a blowing gas is blown into the closed parison. The method includes the step of deriving a relationship between parison length and extruder screw rotation speed during a test molding process. Current parison length is then detected during normal molding operation, and the difference between the current parison length and a target parison length is derived. The extruder screw rotation speed is then controlled by calculating a correction amount for the extruder screw rotation speed based on the parison length difference in combination with the relationship between parison length and extruder screw rotation speed. The extruder screw rotation speed is then adjusted by the correction amount so as to attain the target parison length.
A parison length control method for a blow molding machine, in which a parison is extruded from an extruder to hang in a substantially vertical manner, wherein the end of said parison is closed and a blowing gas is blown into the closed parison, the method comprising the steps of:
A parison length control method for a blow molding machine, in which a parison is extruded from an extruder to hang, the end of said parison is closed a blowing gas is blown into the closed parison, the method comprising the steps of:
Dependencies are inferred from the claim text.