Extended nip roll for use in a nip through which a fibrous web is to be passed

Patent metadata

Field	Value
Publication number	US-9708767-B2
Application number	US-201414917696-A
Country	US
Kind code	B2
Filing date	Oct 29, 2014
Priority date	Nov 14, 2013
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

The invention relates to an extended nip roll 1 for use in a nip N through which a fibrous web W is to be passed. The roll has two axial ends 3, 4 and comprises a support beam 5 having an axial extension between the axial ends 3, 4 of the extended nip roll and a press body 6 with an axial extension and which press body 6 is substantially parallel with the support beam 5 as well as means 7 supported by the support beam 5 for causing the press body to move or expand radially outwards towards a counter roll 2 to form a nip N. The inventive roll also comprises a tubular flexible jacket 8 with two axial ends 12, 13 , the tubular flexible jacket 8 forming a loop around the press body 6 and the support beam 5 . At each end of the extended nip roll 1 , there is an end wall 9, 10 which is rotatably journalled to allow each end wall 9, 10 to rotate about the support beam 5 . Each end wall 9, 10 being attached to an axial end 12, 13 of the tubular flexible jacket 8 such that the end walls 9, 10 and the tubular flexible jacket 8 form together an enclosed space 14 . On the support beam 5 , there is at least one support element 15 for the tubular flexible jacket 8 which support element 15 is arranged to support a part of the tubular flexible jacket 8 at a location spaced away from the press body 6 . According to the invention, the at least one support element 15 is arranged to be movable in a circumferential direction such that it can be moved to different positions along the circumference of the tubular flexible jacket 8.

First claim

The invention claimed is:

1. An extended nip roll ( 1 ) for use in a nip (N) through which a fibrous web (W) is to be passed, the extended nip roll ( 1 ) having two axial ends ( 3 , 4 ) and comprising:
a support beam ( 5 ) having an axial extension between the axial ends ( 3 , 4 ) of the extended nip roll ( 1 );
a press body ( 6 ) having an axial extension and which press body ( 6 ) is substantially parallel with the support beam ( 5 );
means ( 7 ) supported by the support beam ( 5 ) for causing the press body to move or expand radially outwards towards a counter roll ( 2 ) to form a nip (N);
a tubular flexible jacket ( 8 ) with two axial ends ( 12 , 13 ), the tubular flexible jacket ( 8 ) forming a loop around the press body ( 6 ) and the support beam ( 5 );
at each axial end ( 3 , 4 ) of the extended nip roll ( 1 ), an end wall ( 9 , 10 ) which is rotatably journaled to allow each end wall ( 9 , 10 ) to rotate about the support beam ( 5 ), each end wall ( 9 , 10 ) being attached to an axial end ( 12 , 13 ) of the tubular flexible jacket ( 8 ) such that the end walls ( 9 , 10 ) and the tubular flexible jacket ( 8 ) form together an enclosed space ( 14 );
and on the support beam ( 5 ), at least one support element ( 15 ) for the tubular flexible jacket ( 8 ) which support element ( 15 ) is arranged to support a part of the tubular flexible jacket ( 8 ) at a location spaced away from the press body ( 6 ),
wherein the at least one support element ( 15 ) is arranged to be movable in a circumferential direction such that it can be moved to different positions along the circumference of the tubular flexible jacket ( 8 ); and the extended nip further comprises:
at least one curved guide ( 16 ) which is carried by the support beam ( 5 ) and which extends over at least a part of the circumference of the extended nip roll ( 1 ), the curved guide ( 16 ) being located inside the tubular flexible jacket ( 8 );
a carriage ( 17 ) which is movable on the curved guide ( 16 ) and on which carriage ( 17 ) the at least one support element ( 15 ) is carried;
and at least one first actuator ( 18 ) which is carried on the support beam ( 5 ) and arranged to act on the carriage ( 17 ) and cause the carriage ( 17 ) to move along the curved guide ( 16 ) such that the circumferential position of the support element ( 15 ) can be changed.

2. An extended nip roll ( 1 ) according to claim 1 , wherein the at least one support element ( 15 ) is arranged to be movable also in a radial direction.

3. An extended nip roll ( 1 ) according to claim 2 , wherein:
a console ( 19 ) is mounted on the carriage ( 17 ) such that it travels together with the carriage ( 17 );
the at least one support element ( 15 ) is mounted on a bracket ( 20 ) that is carried by the carriage ( 17 ) and arranged to be linearly movable in relation to the console ( 19 ) along a bearing guide ( 21 ) such that the bracket ( 20 ) and the support element ( 15 ) which is mounted on the bracket ( 20 ) can slide in relation to the console ( 19 ) and move in a direction radially outwards or radially inwards; and
at least one second actuator ( 22 ) is arranged to act either directly on the support element ( 15 ) or on the bracket ( 20 ) carrying the at least one support element ( 15 ) such that the at least one support element ( 15 ) moves in the radial direction.

4. An extended nip roll ( 1 ) according to claim 3 , wherein the bearing guide ( 21 ) comprises a linear bearing ( 23 ) and a rail ( 24 ).

5. An extended nip roll ( 1 ) according to claim 3 , wherein the carriage ( 17 ) comprises an element shaped as a circular segment.

6. An extended nip roll ( 1 ) according to claim 3 , wherein the at least one second actuator ( 22 ) is carried on the carriage ( 17 ) and travels together with the carriage ( 17 ).

7. An extended nip roll ( 1 ) according to claim 1 , wherein the extended nip roll ( 1 ) has two or more support elements for the tubular flexible jacket.

8. An extended nip roll ( 1 ) according to claim 1 , wherein:
the extended nip roll ( 1 ) comprises at least two curved guides ( 16 ); and
each curved guide ( 16 ) has a carriage ( 17 ) and one and the same support element ( 15 ) is carried by a carriage ( 17 ) on each curved guide ( 16 ).

Assignees

• Valmet Oy

Inventors

• Goerrel Mats

Classifications

• D21F3/0218 Primary

  Shoe presses · CPC title

• D21G1/006

  with extended nips · CPC title

• D21F3/0209 Primary

  with extended press nip · CPC title