Calender for treating a web of paper

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

1996-12-16

1998-05-05

Gerrity, Stephen F.

Presses

With additional treatment of material

Heating, cooling, or drying

100155R, 100162R, 162206, D21G 102

Patent

active

057461244

ABSTRACT:
A calender for treating a web of paper includes a stack of hard rollers and soft rollers. The stack includes a first set of processing nips and a second set of processing nips. Each processing nip is formed by a juncture of one of the hard rollers and one of the soft rollers. One side of the web of paper contacts against the hard rollers in the first set of processing nips and contacts against the soft rollers in the second set of processing nips. At least a last soft roller in the stack, which delimits a last processing nip that the web of paper passes through in the calender, has a lower surface roughness R.sub.a than a surface roughness R.sub.a of at least a first soft roller in the stack. The first soft roller delimits a first processing nip that the web of paper passes through in the calender. The surface roughness R. of the last soft roller is less than 0.35 .mu.m.

REFERENCES:
patent: 4166758 (1979-09-01), Watanabe et al.
patent: 4216055 (1980-08-01), Watanabe et al.
patent: 4257843 (1981-03-01), Watanabe et al.
patent: 5200258 (1993-04-01), Tamagawa et al.
patent: 5237915 (1993-08-01), Rounsley
patent: 5251551 (1993-10-01), Abe et al.
patent: 5252185 (1993-10-01), Ellis et al.
patent: 5609098 (1997-03-01), Abe et al.
"Die neuen Superkalanderkonzepte", Voith Sulzer Papiertechnik, 1994, No. 05/94 d.

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