Method for controlling the thickness of a sheet material and met

Details Method for controlling the thickness of a sheet material and met Method for controlling the thickness of a sheet material and met

1988-07-15

1990-06-05

MacDonald, Allen

Boots, shoes, and leggings

425141, B29F 300, D21F 100

Patent

active

049319825

ABSTRACT:
The thickness distribution across a sheet material, formed by biaxially stretching a molten material web delivered from a die, is automatically controlled by a control processing wait. A correspondence relationship between adjustment of adjusting means arranged on the die and the variation of thickness distribution of the sheet material after formation thereof is sequentially estimated using a Kalman filter built into the control processing unit. Responsive to the estimated relationship, the adjusting means are controlled by optimum amounts in order to enable the thickness distribution to approach a target distribution. The accuracy of thickness control of the sheet material can be greatly increased and accurate control can automatically follow any variation in the conditiond of a sheet forming process. The correspondence relationship between the thickness distribution of the sheet material and the adjusting means on the die can be monitored and displayed. Responsive to the displayed relationship, information capable of being fed back to the sheet forming process and effective to render uniform the quality of the sheet material in the width direction can be observed.

REFERENCES:
patent: 4124342 (1978-12-01), Akatsuka et al.
patent: 4514348 (1985-04-01), Iguchi et al.
patent: 4680089 (1987-07-01), Aral et al.
"Comparison of a Kalman Filter and its U-D Factorisation from the Viewpoint of Applications in Microprocessor Adaptive Controllers"; Automatizce (Czechoslovakia); vol. 25, No. 10, pp. 238-241; Oct. 1982.

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