Calender for treating both sides of a paper web

Details Calender for treating both sides of a paper web Calender for treating both sides of a paper web

1996-03-07

1997-09-23

Gerrity, Stephen F.

Presses

With additional treatment of material

Heating, cooling, or drying

100162B, 100163A, 100167, 100172, B30B 304, D21G 100

Patent

active

056692951

ABSTRACT:
A calender for the two-sided treatment of a paper web has two similar stacks each of which has at least two soft rollers and two hard rollers. Working nips are formed between each hard and soft roller. The calender has at least one working nip wherein the dwell time (t) is at least 0.1 ms, the surface temperature (T) is at least 100.degree.C., and the load (P) on the stack creates an average compressive stress in the working nip of more than 42 N/mm.sup.2. This provides a calender that is smaller and less expensive to manufacture and operate than super-calenders of the prior art but that also affords excellent finishing results.

REFERENCES:
patent: 440377 (1890-11-01), Snover
patent: 628570 (1899-07-01), Witham
patent: 715017 (1902-12-01), Cameron
patent: 1498237 (1924-06-01), Daniels
patent: 2300994 (1942-11-01), Thiele et al.
patent: 3153378 (1964-10-01), Nelson
patent: 3270664 (1966-09-01), Veneman et al.
patent: 4653395 (1987-03-01), Verkasalo
patent: 4738197 (1988-04-01), Malkia 100 93 RP
"Die neuen Superkalanderkonzepte", Voith Sulzer Papiertechnik, 1994, No. 05/94 d.

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