Cross-directional smoothness controller and method of using the

Details Cross-directional smoothness controller and method of using the Cross-directional smoothness controller and method of using the

1989-01-27

1992-04-21

Beck, Shrive

Coating processes

Vacuum utilized prior to or during coating

Organic base

427361, 118117, 162137, 162206, B05D 312

Patent

active

051066556

ABSTRACT:
An apparatus for controlling the cross-directional smoothness profile of the surface of a calenderable material substantially independently of the materials's caliper profile. A plurality of adjustable nozzles selectively direct jets of steam of selected velocities against sections of the material across the material's width and in counterflow to its movement, immediately before the material enters the last nip of a calender stack. Built-in steam control valves are provided to control the amount of steam applied to each section. Suction means may also be provided upstream of the nozzles, with reference to the movement of the calenderable material, to remove excess steam and thus prevent undesirable condensation on adjacent structures. The smoothness profile may be monitored and compared to a desired smoothness profile and the valves and nozzles may be adjusted accordingly.

REFERENCES:
patent: 2369450 (1945-02-01), Fisher et al.
patent: 3024129 (1962-03-01), Brundige
patent: 3362869 (1968-01-01), Welsh
patent: 3853604 (1974-12-01), Fleissner
patent: 4543737 (1985-10-01), Boissevain
patent: 4573402 (1986-03-01), Sharma
patent: 4580355 (1986-04-01), Boissevain
patent: 4685389 (1987-08-01), Boissevain
patent: 4738196 (1988-04-01), Boissevain
patent: 4765067 (1988-08-01), Taylor
patent: 4786529 (1988-11-01), Boissevain
Tappi Journal, Feb. 1988, "Process Control and Automation of Supercalenders", by Hannu Malkia.
Commonly assigned U.S. patent application Ser. No. 07/303,405 to Boissevain.

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