Method for calendering a board web

Details Method for calendering a board web Method for calendering a board web

2005-03-22

2005-03-22

Chin, Peter (Department: 1731)

Paper making and fiber liberation

Processes and products

Running or indefinite length work forming and/or treating...

C162S207000

Reexamination Certificate

active

06869505

ABSTRACT:
A long nip (N) shoe calender formed of a shoe roll (10) and a thermo roll (20) is used in calendering, with a nip dwell time which is over 10 ms, advantageously over 20 ms. The nip pressure is below 3 MPa, advantageously below 1 MPa, and a surface temperature of the thermo roll (20) is over 200° C., advantageously over 250° C. The board web (W) surface to be pressed against the thermo roll (20) is moisturized before the nip.

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International Preliminary Examination Report issued in International Patent Application No. PCT/FI01/00378.

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