US 5,131,324 AGranted

Calender device for on-line connection to a paper machine

AssigneeValmet Paper Machinery Inc.

InventorsAri Lassila, Kari Sipi

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Abstract

An on-machine calender device intended to be on-line connected to a paper machine. The calender comprises a number of subsequent calendering nips, through which the web (W) to be calendered can be passed. The nips are formed between a soft calender roll and a hard calender roll or between two soft calender rolls. The calender is composed of one or several, for example two, subsequent calender modules (M.sub.1, M.sub.2). The modules comprise one counter-roll (10, 20) and at least two soft calendering rolls (11, 12, 13; 21, 22, 23), which are placed at both sides of the counter-roll (10, 20) in the direction of running of the web (W). The calender rolls (10, 11, 12, 13;20, 21, 22, 23) are dispaceable in relation to each other so that the threading of the web (W) can be carried out as a straight run, for which purpose an open passage is opened through the calender.

Claims21

Dependent claims

A device for on-line calendering a paper web as it originates from a machine, said device having an open position for threading said web and a closed position for calendering said web, said device comprising:

a first soft calender module comprising a first soft calendering roll being placed adjacent said machine, said first soft calendering roll being positioned spaced from said web when said device is placed in the open position, and abutting said web when said device is placed in the closed position;
a first counter-roll positioned downstream from said first soft calendering roll, said first counter-roll being spaced a distance away from and avoiding surface-to-surface contact with said first soft calendering roll when said device is placed in the open position, and abutting said first soft calendering roll to create a first nip therebetween through which said web is passed when said device is placed in the closed position;
a second soft calendering roll positioned downstream from said first counter-roll, said second soft calendering roll being spaced a distance away from and avoiding surface-to-surface contact with said first counter-roll when said device is placed in the open position, and abutting said first counter-roll to create a second nip therebetween through which said web is passed when said device is placed in the closed position;
a second soft calender module spaced from said first calender module comprising a third soft calendering roll disposed downstream from said second soft calendering roll, said third soft calendering roll being positioned spaced from said web when said device is placed in the open position, and abutting said web when said device is placed in the closed position;
a second counter-roll disposed downstream from said third calendering roll, said second counter-roll being spaced a distance away from and avoiding surface-to-surface contact with said third soft calendering roll when said device is placed in the open position, and abutting said third soft calendering roll to create a third nip therebetween through which said web is passed when said device is placed in the closed position;
a fourth soft calendering roll disposed downstream from said second counter-roll, said fourth soft calendering roll being spaced a distance away from and avoiding surface-to-surface contact with said second counter-roll when said device is placed in the open position, and abutting said second counter-roll to create a fourth nip therebetween through which said web is passed when said device is placed in the closed position;
and
means for displacing said rolls to create said open and closed positions, wherein in said open position a substantially horizontal, continuously straight, free passage is created between the nips for threading said web in a substantially straight run through said device, and for independently loading said nips in said closed position when the web is passed between said nips.

5 more elements

A device, for calendering a paper web as it originates from a machine, said device having an open position for threading said web and a closed position for calendering said web, said device comprising:

a first calendering roll being placed adjacent said machine, said first calendering roll being positioned near said web when said device is placed in the open position, and abutting said web when said device is placed in the closed position;
a counter-roll being positioned downstream from said first calendering roll, said counter-roll being spaced a distance away from and avoiding surface-to-surface contact with said first calendering roll when said device is placed in the open position, and abutting said first calendering roll to create a first nip therebetween through which said web is passed when said device is placed in the closed position;
a second calendering roll being positioned downstream from said counter-roll, said second calendering roll being spaced a distance away from and avoiding surface-to-surface contact with said counter-roll when said device is placed in the open position, and abutting said counter-roll to create a second nip therebetween through which said web is passed when said device is placed in the closed position;
a third calendering roll positioned between said first and second calendering rolls, said third calendering roll being spaced a distance away from, and avoiding surface-to-surface contact with said counter-roll when said device is placed in the open position, and abutting said counter-roll to create a third nip therebetween through which said web is passed when said device is placed in the closed position;
and
means for displacing said rolls to create said open and closed positions, wherein in said open position a substantially horizontal, continuously straight, free passage is created between the nips for threading said web in a substantially straight run, and in said closed position the web is passed between said nips by said rolls.

3 more elements

Dependencies are inferred from the claim text.