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Patent Searching and Data


Title:
DIAMETER CONTROL OF CYLINDRICAL FILM PRODUCED BY BLOWING FORMING PLANT
Document Type and Number:
Japanese Patent JPH05185508
Kind Code:
A
Abstract:

PURPOSE: To obtain correct results without accurately measuring the height of frost line by keeping a control circuit at a specified diameter set point and controlling temperatures of plastic materials, rotating speed of an extruder, and drawing speed based on deviation in diameters from the set point.

CONSTITUTION: A calibration basket 8 is provided above a frost line 7, under which a first measurement pick-up 6 is provided to measure the outside limit of a blowing film at a first measuring point. A second measurement pick-up 5 is provided at a second measuring point above the frost line 7. Measured values at the first and second measuring points are inputted to a computer 9 and processed. The computer 9 controls the supply and exhaust of internal cooling air, and the output of an extruder 1. Measured values at the first measuring point 6 are inputted to a valve control device 10 which controls the supply and exhaust of internal air.


Inventors:
KUREMENSU ZENZEN
EDOGARU GANDERUHAITO
HORUSHIYUTO ZANTOKENPERU
Application Number:
JP18069792A
Publication Date:
July 27, 1993
Filing Date:
July 08, 1992
Export Citation:
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Assignee:
WINDMOELLER & HOELSCHER
International Classes:
B29C49/04; B29C48/92; B29C49/78; B29C55/28; B29D7/01; G05D5/00; (IPC1-7): B29C49/04; B29C49/78; B29C55/28; B29L23/22
Attorney, Agent or Firm:
Minoru Nakamura (6 outside)