Paper making machine and a method of cutting a fibrous web in a paper making machine

Patent metadata

Field	Value
Publication number	US-11530515-B2
Application number	US-201816621484-A
Country	US
Kind code	B2
Filing date	Jun 7, 2018
Priority date	Jun 21, 2017
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

The invention relates to a paper making machine ( 1 ) comprising a forming section ( 2 ) in which a fibrous web (W) can be formed, a drying section ( 5 ) in which a formed fibrous web (W) can be dried; and a reel-up ( 11 ) on which a dried fibrous web (W) can be wound into a roll ( 12 ). The paper making machine ( 1 ) is arranged to carry a fibrous web (W) in the machine direction (MD) along a predetermined path (P) and the paper making machine ( 1 ) has at least one water jet cutting device ( 17, 18, 19 ) arranged to cut the fibrous web (W) that is moving in the machine direction (MD) such that the fibrous web (W) is divided into at least one waste part ( 23 a, 23 b, 30 ) and a remaining part ( 24, 29 ). The paper making machine ( 1 ) is arranged to direct the at least one waste part ( 23 a, 23 b, 30 ) away from the predetermined path (P) and to convey the remaining part ( 24, 29 ) further in the machine direction (MD) along the predetermined path (P). The paper making machine ( 1 ) further comprises a blowing device ( 20, 21, 22 ) arranged to blow gas or air against the water jet cutting device ( 17, 18, 19 ) in a direction toward the remaining part of the fibrous web ( 24, 29 ) such that fiber particles that have been released by the cutting action of the water jet cutting device ( 17, 18, 19 ) are blown onto the surface ( 25 ) of the remaining part ( 24, 29 ) of the fibrous web (W) and follow the remaining part ( 24, 29 ) of the fibrous web along the predetermined path (P). The invention also relates to a method in which gas or air is blown in a direction toward the remaining part of the web such that fiber particles that have been released by the cutting action of the water jet cutting device ( 17, 18, 19 ) are blown onto the surface ( 25 ) of the remaining part ( 24, 29 ) of the fibrous web (W). The stream of air or gas is given a shape which is circular cylindrical or conical and expanding in the direction in which the stream moves.

First claim

The invention claimed is:

1. A paper making machine ( 1 ) comprising:
a forming section ( 2 ) in which a fibrous web (W) can be formed;
a drying section ( 5 ) in which a formed fibrous web (W) can be dried;
a reel-up ( 11 ) on which a dried fibrous web (W) can be wound into a roll ( 12 );
at least one water jet cutting device ( 17 , 18 , 19 ); and
at least one blowing device ( 20 , 21 , 22 ) configured to blow gas or air in an area of the at least one water jet cutting device ( 17 , 18 , 19 ),
wherein:
a machine direction (MD) is defined as the direction from the forming section ( 2 ) toward the reel-up ( 11 ) and the paper making machine ( 1 ) is configured to carry a fibrous web (W) in the machine direction (MD) along a predetermined path (P),
the at least one water jet cutting device ( 17 , 18 , 19 ) is configured to cut the fibrous web (W) that is moving in the machine direction (MD) such that the fibrous web (W) is divided into at least one waste part ( 23 a , 23 b , 30 ) and a remaining part ( 24 , 29 ),
the paper making machine ( 1 ) is configured to direct the at least one waste part ( 23 a , 23 b , 30 ) away from the predetermined path (P) and to convey the remaining part ( 24 , 29 ) further in the machine direction (MD) along the predetermined path (P),
the at least one blowing device ( 20 , 21 , 22 ) is configured to blow the gas or air against the water jet cutting device ( 17 , 18 , 19 ) in a direction toward the remaining part of the fibrous web ( 24 , 29 ) such that fiber particles that have been released by the cutting action of the water jet cutting device ( 17 , 18 , 19 ) are blown onto the surface ( 25 ) of the remaining part ( 24 , 29 ) of the fibrous web (W) and follow the remaining part ( 24 , 29 ) of the fibrous web along the predetermined path (P),
the at least one blowing device ( 20 , 21 , 22 ) comprises a nozzle with an exit opening ( 41 ) through which the air or gas is ejected in a stream ( 47 ), the nozzle being oriented at an angle (α) relative to the machine direction (MD) such that the stream ( 47 ) of air or gas that is blown out of the exit opening ( 41 ) is directed in its entirety at an angle to the machine direction (MD), and
the nozzle of the at least one blowing device ( 20 , 21 , 22 ) is configured to a create a circular cylindrical or cone-shaped stream ( 47 ) of air or gas toward the water jet cutting device ( 17 , 18 , 19 ).

2. The paper making machine ( 1 ) according to claim 1 , wherein the paper making machine ( 1 ) further comprises:
a frame ( 13 ) configured to support rolls ( 35 ) that extend from a first side ( 15 ) of the paper making machine ( 1 ) to a second side ( 16 ) of the machine ( 1 ) in a cross-machine direction (CD) that is perpendicular to the machine direction (MD), and
a first water jet cutting device ( 17 ) positioned in the forming section adjacent the first side of the frame and configured to cut a narrow edge strip ( 23 a ) from the fibrous web (W),
a second water jet cutting device ( 18 ) positioned in the forming section ( 2 ) adjacent the second side ( 16 ) of the frame ( 13 ) and configured to cut a narrow edge strip ( 23 b ) from the fibrous web (W) such that, at the edges of the fibrous web (W), two edge strips ( 23 a , 23 b ) are separated from a remaining part ( 24 ) of the fibrous web (W) which remaining part ( 24 ) is located between the edge strips ( 23 a , 23 b ) and is wider than the two edge strips ( 23 a , 23 b ) together,
wherein the at least one blowing device ( 20 , 21 , 22 ) comprises a first blowing device ( 20 ) for the first ( 17 ) water let cutting device and a second blowing device ( 21 ) for the second ( 18 ) water jet cutting device, the first and second blowing devices ( 20 , 21 ) being configured to blow gas or air against their respective water jet cutting device ( 17 , 18 ) in a direction toward the remaining part ( 24 ) of the fibrous web (W) such that fiber particles that have been released by the cutting action of the water jet cutting devices ( 17 , 18 ) are blown onto the surface of the remaining part ( 24 ) of the fibrous web (W) and follow the remaining part ( 24 ) of the fibrous web along the predetermined path (P).

3. The paper making machine ( 1 ) according to claim 2 , wherein:
the paper making machine ( 1 ) comprises a through air drying cylinder ( 7 ) and a foraminous wire ( 6 ) configured to run in a loop in a path which partially goes over a part of an outer circumference of the through air drying cylinder ( 7 ),
the forming section ( 2 ) of the paper making machine comprises a forming fabric ( 4 ) and the first and second water jet cutting devices ( 17 , 18 ) are configured to act on the fibrous web (W) as the fibrous web (W) travels on the forming fabric ( 4 ),
the forming fabric ( 4 ) is configured to carry the remaining part ( 24 ) of the fibrous web (W) to the foraminous wire ( 6 ) after the water jet cutting devices ( 17 , 18 ) have acted on the fibrous web (W),
the paper making machine ( 1 ) is configured to transfer the remaining part ( 24 ) of the fibrous web (W) onto the foraminous fabric ( 6 ) and to guide the edge strips ( 23 a , 23 b ) away from the predetermined path (P), and
the remaining part ( 24 ) of the fibrous web (W) is transferred to the foraminous wire ( 6 ) such that the surface of the major portion onto which fiber particles have been blown comes into contact with the foraminous wire ( 6 ).

4. The paper making machine ( 1 ) according to claim 1 , wherein:
the paper making machine ( 1 ) comprises a moveable water jet cutting device ( 19 ) that is capable of moving in a cross-machine direction (CD) that is perpendicular to the machine direction (MD) such that a tail ( 29 ) can be cut from the fibrous web (W) for the purpose of threading,
the paper making machine ( 1 ) is configured to convey the tail ( 29 ) further in the machine direction (MD) along the predetermined path (P) while the rest of the fibrous web (W) is directed away from the predetermined path (P), and
the at least one blowing device comprises a first blowing device ( 22 ) configured to blow gas or air against the moveable water jet cutting device ( 19 ) in a direction toward the tail ( 29 ) such that fiber particles that have been released by the cutting action of the water jet cutting device ( 19 ) are blown onto the surface of the tail ( 29 ) and follow the tail ( 29 ) along the predetermined path (P).

5. The paper making machine according to claim 1 , wherein the at least one blowing device ( 20 , 21 , 22 ) is an air amplifier.

6. The paper making machine according to claim 1 , wherein the position of the at least one blowing device ( 21 , 21 , 22 ) relative to at least one of the water jet cutting device ( 17 , 18 , 19 ) or the angle (α, β) at which the nozzle of the at least one blowing device ( 20 , 21 , 22 ) together with its exit opening ( 41 ) is directed toward the at least one blowing device ( 20 , 21 , 22 ) is/are adjustable.

7. A method of cutting a fibrous web (W) which is running along a predetermined path in a paper making machine ( 1 ) in a machine direction (MD) from a forming section ( 2 ) in which the fibrous web (W) is formed toward a reel-up ( 11 ) where the fibrous web (W) is wound to a roll ( 12 ) after it has been dried, the method comprising:
cutting the web by means of a water jet cutting device ( 17 , 18 , 19 ) such that the fibrous web (W) is divided into at least one waste part ( 23 a , 23 b , 30 ) and a remaining part ( 24 , 29 ) which waste part ( 23 a , 23 b , 30 ) is directed away from the predetermined path and which remaining part ( 24 , 29 ) is conveyed further in the machine direction (MD) along the predetermined path (P); and

Assignees

• Valmet Oy

Inventors

• Mcclure Wightwick Scott

Classifications

• D21G9/0063

  Devices for threading a web tail through a paper-making machine · CPC title

• B65H2515/12

  Density · CPC title

• B26D7/1854

  by air under pressure · CPC title

• B26F3/004

  by means of a fluid jet (methods for use of abrasive blasting for cutting B24C1/045; guns for abrasive fluid jets B24C5/02; perforating by non-mechanical means, e.g. by fluid jet B26F1/26) · CPC title

• D21F7/006 Primary

  Cutting the edges of the paper-web · CPC title