System and method for cleaning of belts and/or fabrics used on through air drying papermaking machines

Patent metadata

Field	Value
Publication number	US-12221748-B2
Application number	US-202217677170-A
Country	US
Kind code	B2
Filing date	Feb 22, 2022
Priority date	Feb 22, 2021
Publication date	Feb 11, 2025
Grant date	Feb 11, 2025

Abstract

A method for cleaning a belt of a through air drying papermaking machine in which a high pressure shower is configured to traverse across a width of the belt of the papermaking machine while ejecting water onto the belt, and a vacuum box is operatively connected to the high pressure shower. The high pressure shower has a width that is less than a full width of the belt.

First claim

The invention claimed is:

1. A system for cleaning a through air drying fabric of a through air drying papermaking machine, comprising:
a high pressure shower configured to traverse across a width of the through air drying fabric at a through air drying section of the papermaking machine while ejecting water onto the through air drying fabric, the high pressure shower having a full width that is less than a full width of the through air drying fabric; and
a vacuum box operatively connected to the high pressure shower,
the through air drying section comprising a through air drying drum on which the through air drying fabric is mounted, and the high pressure shower and the vacuum box are configured to operate to clean the through air drying fabric while the through air drying drum is in operation.

2. The system of claim 1 , wherein the high pressure shower is configured to eject water onto a sheet-contacting side of the through air drying fabric.

3. The system of claim 1 , wherein the high pressure shower is configured to eject water onto a non-sheet-contacting side of the through air drying fabric.

4. The system of claim 3 , further comprising a second high pressure shower configured to traverse across the width of the through air drying fabric of the papermaking machine while ejecting water onto a sheet-contacting side of the through air drying fabric, the second high pressure shower having a full width that is less than a full width of the through air drying fabric; and
a second vacuum box operatively connected to the second high pressure shower.

5. The system of claim 1 , wherein the through air drying fabric is a structuring fabric.

6. The system of claim 1 , wherein the high pressure shower is positioned adjacent a machine roll upon which the through air drying fabric is wrapped 30° to 270° around a circumference of the machine roll.

7. The system of claim 1 , wherein the vacuum box has a curved shape corresponding to the circumference of the machine roll.

8. The system of claim 1 , wherein the high pressure shower is a needle shower.

9. The system of claim 1 , wherein the needle shower comprises a plurality of nozzles.

10. The system of claim 9 , wherein the plurality of nozzles are configured to eject round water jets with a diameter of 0.15 mm to 0.55 mm.

11. The system of claim 9 , wherein the plurality of nozzles are configured to eject round water jets with a diameter of 0.2 mm to 0.3 mm in diameter.

12. The system of claim 9 , wherein pressure of the water jets is 20 Bar to 600 Bar.

13. The system of claim 9 , wherein pressure of the water jets is 100 Bar to 300 Bar.

14. The system of claim 9 , wherein the needle shower comprises 1 to 50 nozzles.

15. The system of claim 9 , wherein the needle shower comprises 1 to 20 nozzles.

16. The system of claim 9 , wherein the needle shower comprises 1 to 10 nozzles.

17. The system of claim 1 , further comprising an air knife configured to traverse across the width of the through air drying fabric of the papermaking machine while blowing air onto the through air drying fabric in a direction towards the vacuum box.

18. The system of claim 1 , wherein the through air drying fabric comprises a multi-layer structured tissue fabric without direct channels extending perpendicularly through the fabric.

19. The system of claim 1 , wherein the system comprises a sheet side and rolls side multi-unit traversing system that cleans each side separately.

20. The system of claim 1 , wherein the through air drying fabric is a structured tissue fabric with air flow permeability between 250 to 500 cfm.

21. The system of claim 1 , wherein the high pressure shower is a non-rotating pressure shower.

Assignees

• First Quality Tissue Llc

Inventors

• Sealey Ii James E
• Begin Marc Paul
• Kennedy Theodore D

Classifications

• D21F5/182

  through perforated cylinders · CPC title

• D21F1/32 Primary

  Washing wire-cloths or felts · CPC title

• D21F1/325 Primary

  with reciprocating devices · CPC title