Waterbox calendering

Details Waterbox calendering Waterbox calendering

1995-03-06

1996-06-04

Gerrity, Stephen F.

Presses

With additional treatment of material

Adding materials

100102, 100162R, B30B 304, D21G 900

Patent

active

055223125

ABSTRACT:
A method and apparatus are disclosed for uniformly applying a metered film of liquid to one or both surfaces of a web of paper, paperboard or the like at a waterbox calender to achieve enhanced finishing with minimal loss of caliper. For this purpose, a liquid metering element is adjustably mounted on a conventional waterbox associated with the calender, for precisely controlling the thickness and uniformity of a liquid film applied to the calender roll. The liquid film is subsequently transferred to the web at a transfer nip of the waterbox calender.

REFERENCES:
patent: 388921 (1888-09-01), Shartle
patent: 638757 (1899-12-01), Pratt
patent: 1857497 (1932-05-01), Clapp
patent: 1864852 (1932-06-01), Oblinger
patent: 2130530 (1938-09-01), Fletcher
patent: 3139374 (1964-06-01), Goyette
patent: 3220339 (1965-11-01), Keyworth et al.
"Practical Aspects of Calender Steam Showers", by R. N. Vyse and D. J. Sawley, Tappi Journal, Oct. 1988, pp. 87-90.

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