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

1998-08-11

Gerrity, Stephen F.

Presses

With additional treatment of material

Heating, cooling, or drying

100162R, 100162B, 100172, 100173, 100161, D21G 100

Patent

active

057912424

ABSTRACT:
A calender for treating both sides of a paper web includes hard rollers and soft rollers. Working nips are formed between the juncture of each hard roller and soft roller. The roller stack can be loaded from one end, and preferably includes six to eight rollers. A changeover nip is formed by the juncture of two soft rollers or at the transition between two stacks. When using two stacks, each stack preferably has three to five rollers. At least one working nip has a dwell time of at least 0.1 ms. A heatable roller adjacent to the working nip is heated to a surface temperature of at least 100.degree. C. The roller stack is loaded such that an average compressive stress in the working nip is greater than or equal to 42 N/mm.sup.2.

REFERENCES:
patent: 1793114 (1931-02-01), Minton
patent: 3124504 (1964-03-01), Mahoney et al.
patent: 3230867 (1966-01-01), Nelson
patent: 4749445 (1988-06-01), Vreeland
patent: 5237915 (1993-08-01), Rounsley
patent: 5438920 (1995-08-01), Koivukunnas et al.
"Synthetic Composite Covers in Supercalenders: Update", by Thomas J. Lauterbach, dated Jun. 1993, pp. 115-119.
"Supercalendering and Soft Nip Calendering Compared", by John D. Peel, dated Oct. 1991, pp. 179-186.
"Die neuen Superkalanderkonzepte", Voith Sulzer Papiertechnik, 1994, No. May 1994 d.

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