US 7,179,349 B2Granted

Method and device for passing a web in connection with a finishing device of a paper or board machine

AssigneeMetso Paper, Inc.

InventorPekka Koivukunnas

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Abstract

A web (W) is passed from a preceding treatment stage to a finishing device in which the web (W) is finished in the finishing device and from which finishing device the web (W) is passed further to a subsequent treatment stage. The web (W) is brought to a roll (11; 14) of the finishing device as supported substantially before a nip area (N1; N2). The web (W) is passed from the circumference of a roIl (12; 15) of the finishing device as substantially supported afler the nip area (N1; N2). A device for passing a web in connection with a finishing device of a paper machine causes a web (W) to be brought by the device to the circumference of a roll (11; 14) of the finishing device substantially before a nip area (N1; N2) and/or the web (W) can be passed from the circumference of a roll (12; 15) of the finishing device substantially after the nip area (N1; N2).

Claims13

Dependent claims

A method for passing a web in connection with a calender of a paper or board machine, comprising the steps of:

passing the web from a preceding process stage on a first support member loop which carries the web from the preceding process stage to a first roll of the calender, the first roll having a circumference and forming a first nip with a second roll;
supporting the web on the first support member loop prior to being passed to the first roll and passing the web to the first roll circumference substantially before the first nip such that the first support member loop does not pass through the first nip;
passing the web from the circumference of the first roll to the first nip defined between the first roll and the second roll of the calender;
and
calendering the web at the first nip, and passing the web along a circumference of the second roll between the first nip and a second support member loop from which the web is transferred to a subsequent process stage;
wherein one of the first roll and the second roll is a thermo roll and the web is wrapped about a portion of the thermo roll to form a shield so preventing loss of heat from said thermo roll;
and
wherein the web runs from the preceding process stage to the subsequent process stage through the calender while being supported all the time by the first support member loop, the first calender roll, the second calender roll and the second support member loop.

5 more elements

Dependencies are inferred from the claim text.