Device and method for producing a fibrous web

Patent metadata

Field	Value
Publication number	US-12006631-B2
Application number	US-202017790828-A
Country	US
Kind code	B2
Filing date	Dec 1, 2020
Priority date	Jan 30, 2020
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

A device and a method for producing a pulp web in which the first clothing and the second clothing are wrapped partly round the forming roll and another roll. The pulp web formed is guided between the forming roll and the other roll on the first clothing and the second clothing is guided separately from the first clothing, at least in one section. This enables the pulp web to be produced with low energy consumption and operating costs.

First claim

The invention claimed is:

1. A device for producing a pulp web ( 9 ), comprising:
a headbox ( 1 ),
a first clothing run comprising a continuously revolving clothing ( 4 ) and first clothing guides, and defining an inside and an outside,
a second clothing run comprising a second continuously revolving clothing ( 3 ) and second clothing guides, and defining an inside and an outside,
a forming roll ( 2 ) disposed on the inside of the first continuously revolving clothing ( 4 ),
at least one other roll ( 11 ) disposed on the inside of the first continuously revolving clothing ( 4 ),
an external clothing guide ( 13 ), and
a means for reducing a water load in the second revolving clothing ( 3 ) provided between the forming roll ( 2 ) and the other roll ( 11 ), wherein
the first continuously revolving clothing ( 4 ) is wrapped partly around the forming roll ( 2 ) and the other roll ( 11 ) with the forming roll ( 2 ) and the other roll ( 11 ) disposed on the outside of the second continuously revolving clothing ( 3 ),
the second continuously revolving clothing ( 3 ) is wrapped partly around the forming roll ( 2 ) and the other roll ( 11 ),
the first continuously revolving clothing ( 4 ) is disposed between the second continuously revolving clothing ( 3 ) and the forming roll ( 2 ),
the first continuously revolving clothing ( 4 ) is disposed between the second continuously revolving clothing ( 3 ) and the other roll ( 11 ) and between the forming roll ( 2 ) and the headbox ( 1 ) for placing a pulp suspension between the first continuously revolving clothing ( 4 ) and the second continuously revolving clothing ( 3 ),
the second clothing run has the external clothing guide ( 13 ) positioned between the forming roll ( 2 ) and the other roll ( 11 ) to guide the second continuously revolving clothing ( 3 ) separately from the first continuously revolving clothing ( 4 ) in a section between the forming roll ( 2 ) and the other roll ( 11 ),
the external clothing guide ( 13 ) is disposed on the outside of the second continuously revolving clothing ( 3 ),
the external clothing guide ( 13 ) is disposed between the first continuously revolving clothing ( 4 ) and the second continuously revolving clothing ( 3 ), and
the water load is reduced in the section of the second continuously revolving clothing ( 3 ) that is separately guided between the forming roll ( 2 ) and the other roll ( 11 ) by the means for reducing a water load.

2. The device according to claim 1 , wherein the first continuously revolving clothing ( 4 ) is a felt and the second continuously revolving clothing ( 3 ) is a forming fabric.

3. The device according to claim 1 , wherein the other roll ( 11 ) is a suction roll.

4. The device according to claim 3 , comprising a steam blow box or a dryer hood provided in an area of the other roll ( 11 ) configured to apply one or both of hot air and steam in a direction toward the other roll ( 11 ), wherein the steam blow box or dryer hood is disposed on the inside of the second clothing run.

5. The device according to claim 1 , wherein the means for reducing a water load is configured as one or more of suction strips, suction boxes, air nozzles, slotted nozzles and air blades provided between the forming roll ( 2 ) and the other roll ( 11 ) and configured to reduce the water load in the section of the second continuously revolving clothing ( 3 ) that is separately guided.

6. The device according to claim 5 , wherein the means for reducing water load comprises one or more of suction strips, suction boxes, air nozzles, slotted nozzles and air blades disposed for dispersion on the outside of the second clothing run.

7. The device according to claim 6 , wherein the means for reducing a water load comprises one or more of suction strips, suction boxes, air nozzles, slotted nozzles and air blades disposed in an inlet area between the external clothing guide ( 13 ) and the second continuously revolving clothing ( 3 ).

8. The device according to claim 5 , wherein the means for reducing a water load comprises one or both of suction strips and suction boxes provided between the forming roll ( 2 ) and the other roll ( 11 ) and configured for applying suction to the second continuously revolving clothing ( 3 ) in the section of the second continuously revolving clothing ( 3 ) that is separately guided.

9. The device according to claim 1 , comprising a press roll ( 10 ) disposed on the inside of the second clothing run in an area of the other roll ( 11 ), thereby forming a pressing area with the other roll ( 11 ).

10. The device according to claim 1 , wherein the means for reducing a water load comprises one or both of suction strips and suction boxes provided between the forming roll ( 2 ) and the other roll ( 11 ) and configured for applying suction to the second continuously revolving clothing ( 3 ) in the section of the second continuously revolving clothing ( 3 ) that is separately guided.

11. The device according to claim 6 , wherein the means for reducing a water load additionally comprises one or both of suction strips and suction boxes provided between the forming roll ( 2 ) and the other roll ( 11 ) and configured for applying suction to the second continuously revolving clothing ( 3 ) in the section of the second continuously revolving clothing ( 3 ) that is separately guided.

12. The device according to claim 7 , wherein the means for reducing a water load additionally comprises one or both of suction strips and suction boxes provided between the forming roll ( 2 ) and the other roll ( 11 ) and configured for applying suction to the second continuously revolving clothing ( 3 ) in the section of the second continuously revolving clothing ( 3 ) that is separately guided.

Assignees

• Andritz Ag Maschf

Inventors

• Jancic Boris
• Gissing Lukas
• Marenco Stefano
• Gissing Klaus

Classifications

• D21F7/08

  Felts · CPC title

• D21F3/10

  Suction rolls, e.g. couch rolls · CPC title

• D21F3/0272

  in combination with suction or blowing devices · CPC title

• D21F1/10

  Wire-cloths · CPC title

• D21F1/02

  Head boxes of Fourdrinier machines · CPC title