Method of controlling the film thickness of flat films produced

Details Method of controlling the film thickness of flat films produced Method of controlling the film thickness of flat films produced

1981-02-19

1984-01-17

Dawson, Robert A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

73159, 15624411, 156378, 264 401, 425141, 425144, 425145, 427 9, B29D 702

Patent

active

044262396

ABSTRACT:
To achieve a substantially uniform thickness of film extruded from or coated by a sheet die, the thicknesses of the film are measured over its width and the film is sub-divided widthwise into imaginary sections of equal length. Each film section is associated with a correcting section of the sheet die. If the thickness measurement reveals a thick or thin portion in a film section, the associated correcting section is cooled or heated, respectively. The mean thickness distributions are determined from the measurements and employed as a correcting signal for setting elements of the individual correcting sections.

REFERENCES:
patent: 3307215 (1967-03-01), Gerhard et al.
patent: 3767346 (1973-10-01), Mihalik
patent: 4246212 (1981-01-01), Upmeier et al.

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