Method and apparatus for controlling the size of an opening thro

Details Method and apparatus for controlling the size of an opening thro Method and apparatus for controlling the size of an opening thro

1984-09-17

1987-02-03

Alvo, Steve

Paper making and fiber liberation

Processes and products

Running or indefinite length work forming and/or treating...

162259, 162347, 264 407, 425141, 425144, B29C 3938, B29C 3944, D21C 102, D21C 106

Patent

active

046407421

ABSTRACT:
The present invention teaches a method and apparatus for controlling the size of an opening through which material is metered by generating energy in the form of a magnetic field close to an element which forms an integral part of the metering device, the element movable relative to another member. The method and apparatus can be utilized for controlling a desired physical property of a product which is dependent on the metering operation, such properties as basis weight, caliper, density, bulk, reel hardness, gloss, smoothness, and opacity, of interest in the paper, plastics and coating fields.

REFERENCES:
patent: 3261893 (1966-07-01), George et al.
patent: 3463701 (1969-08-01), Curtis
patent: 3940221 (1976-02-01), Nissel
patent: 4252519 (1981-02-01), Farmer et al.
patent: 4358342 (1982-11-01), Nuttall

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