Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1992-12-22
1995-03-21
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 407, 264540, 264541, 425140, 425532, B29C 4904, B29C 4978
Patent
active
053993020
ABSTRACT:
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.
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Dormeier et al., Entwicklung einer selbstanpassenden Vortforminglangenregelung (The Development of Self-Adapting Preform Length Control), Kunststoffberater, Feb. 1977.
Junk et al., Von der Prozebanalyse zur Rechnersteuerung-dargestellt am Beispiel des Extrusionblasformens (On Process Analysis of Computer Control-Illustrated with the Example of Extrusion Blow Molding, Kunstoffberater, Jun. 1978.
"Regelsystem fur die Vorformlinglange," S. Dormeier, J. Sahlmen, Plastverarbeiter, vol. 38, No. 11, Nov. 1987, pp. 70-80.
Akimoto Masayuki
Noguchi Tokuji
Ohizumi Minoru
Yamanoi Mitsuo
Yano Masashi
Kao Corpoation
Miller Austin R.
Tahara Machinery Limited
Timm Catherine
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