Arrangement for Treating Fiber Web
AssigneeMetso Paper, Inc.
InventorsMika Viljanmaa, Topi Tynkkynen
Life of this patent
Estimating the term…
Abstract
An arrangement for treating a fiber web, in particular for sizing paper and board web (W), using a sizer (10) which has sizing equipment (3, 4) located on both sides of the web (W) and size press rolls (5, 6) located on both sides of the web (W) in between of which a size nip is formed. The web (W) when approaching the sizer (10) is first guided past the size nip of the sizer (10) in a process direction (D) and then is turned into an opposite direction (OD) in relation to the process direction (D) by at least one turning guide roll (15) such that the top side (TS) of the web (W) is sized by sizing equipment (4) located below the web (W).
Claims21
An arrangement for sizing paper or board web, comprising:
- a sizer which comprises sizing equipment located on both sides of a web and size press rolls located on both sides of the web, the size press rolls forming a size nip therebetween;
- wherein the sides of the web comprise a top side, and a bottom side;
- wherein a process direction is defined which extends from a source of the web to a store of the web;
- wherein the sizing equipment located on both sides of the web comprises a sizing equipment above the web and a sizing equipment below the web;
- wherein the web is arranged to approach the sizer by extending along a path past the sizer nip of the sizer in the process direction and then the web extends about at least one turning guide roll and extends in a direction opposite the process direction such that the top side of the web is positioned to be sized by the sizing equipment located below the web so that the top side will be less prone to receive drips from the sizing equipment located below the web and the web top side will have fewer defects and so the top side in a final product made of the fiber web when placed on an outside of an object has fewer defects in view.
An arrangement for sizing paper or board web, comprising:
- a web having a top side, and a bottom side, the web defining a process direction as it extends from a source of web into and out of a sizer to a store of web;
- wherein the sizer has sizing equipment located on both sides of a web, comprising a sizing equipment above the web and a sizing equipment below the web, and wherein size press rolls are located on both sides of the web, the size press rolls forming a size nip therebetween, the size press rolls comprising a first press roll and a later press roll which is downstream in the process direction from the first press roll;
- wherein the web is arranged to approach the sizer by extending along a path past the sizer nip of the sizer in the process direction and then extends about at least one turning guide roll and extends in a backward direction opposite the process direction such that the top side of the web is positioned to be sized by the sizing equipment located below the web so that the top side will be less prone to receive drips from the sizing equipment located below the web and the web top side will have fewer defects and so the top side in a final product made of the fiber web when placed on an outside of an object has fewer defects in view.
A method for sizing paper or board web, comprising:
- passing a web having a top side and a bottom side through a sizer so the web passes through the sizer in a process direction as the web travels from a source of web into and out of the sizer to a store of web;
- conducting the web toward the sizer in the process direction so the web travels past a size nip formed between a first press roll and a later press roll of the sizer;
- turning the web about at least one turning guide roll;
- passing the web through the size nip in a backward direction opposite the process direction;
- sizing the bottom side of the web with sizing equipment located above the web before the size nip;
- sizing the top side of the web with sizing equipment located below the web and before the size nip so that the top side is less prone to receiving drips from the sizing equipment below the web than the bottom side of the web is to receive drips from the sizing equipment above the web, so the web top side has fewer defects than the web bottom side and using the web in a product so the top side is placed on an outside of an object and has fewer defects in view.
Dependencies are inferred from the claim text.