Method and apparatus for controlling the thickness of a lamina o

Details Method and apparatus for controlling the thickness of a lamina o Method and apparatus for controlling the thickness of a lamina o

1982-09-27

1985-04-30

Grossman, Jon D.

Boots, shoes, and leggings

425141, 425140, 425145, 425148, 264 402, 264 401, 264 403, 264 407, 364469, 364468, 324 61P, G06F 1546, G06G 764, B28B 1700, B28

Patent

active

045148120

ABSTRACT:
A method and apparatus for controlling the average thickness (T.sub.1) of a film lamina of thermoplastic, dielectric material having a known density (D.sub.1) and coextruded at a variable extrusion rate with a foam lamina of similar thermoplastic material having a thickness (T.sub.2) and the density of (D.sub.2) to form a thermoplastic laminate is disclosed. The apparatus comprises a first gauge for sensing the thickness of the laminate and for providing a caliper signal (C) corresponding to the thickness sensed and a second gauge for sensing the mass/unit-area of the laminate and for providing a mass signal (M) corresponding to the mass/unit-area sensed. The apparatus further comprises a third gauge for sensing a response to the dielectric material and its distribution in the laminate and for providing a dielectric signal (W) corresponding to the response sensed. The apparatus also comprises a computer connected to the first, second and third gauges and responsive to successive sets of signals comprising the caliper signal (C), the mass signal (M) and the dielectric signal (W) for calculating the thickness (T.sub.1) of the film lamina according to a specific formula and for comparing an average thickness (T.sub.1) to a desired thickness (T.sub.0) to control the extrusion rate of the film lamina.

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patent: 4177097 (1979-12-01), Hudson, Jr. et al.
patent: 4244897 (1981-01-01), Moon
patent: 4428896 (1984-01-01), Stevenson
patent: 4444702 (1984-01-01), Thomas et al.

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