Method and forming belt for producing a fibre material web

Patent metadata

Field	Value
Publication number	US-10934664-B2
Application number	US-201716093842-A
Country	US
Kind code	B2
Filing date	Apr 10, 2017
Priority date	Apr 15, 2016
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

A method for producing a structured fibrous web, in particular a tissue web, includes bringing a fibrous suspension into contact with at least one structured forming belt and dewatering by using at least one dewatering element, in particular a suction element. The at least one structured forming belt includes a layer of polymer foam providing a paper-contacting side of the structured forming belt. The structure of the foam layer is at least partially transferred to the fibrous web. A structured forming belt and a machine for producing a fibrous web are also provided.

First claim

The invention claimed is:

1. A method for producing a structured fibrous web or a tissue web, the method comprising the following steps:
providing at least one structured forming belt including a layer of polymer foam providing a paper-contacting side of the at least one structured forming belt, the pores in the layer of polymer foam having a pore density of less than 30 PPI;
bringing a fibrous suspension into contact with the at least one structured forming belt;
using at least one dewatering element or a suction element to dewater the fibrous suspension; and
at least partly transferring a structure of the foam layer to the fibrous web.

2. The method according to claim 1 , which further comprises carrying out the transferring step by transferring at least part of the structure of the layer of polymer foam to the fibrous web as a pore structure of the layer of polymer foam.

3. The method according to claim 1 , which further comprises carrying out the transferring step by transferring at least part of the structure of the layer of polymer foam to the fibrous web as an external structure having been incorporated in the layer of polymer foam.

4. The method according to claim 3 , which further comprises incorporating the external structure in the layer of polymer foam by embossing, branding, etching, cutting, or punching.

5. A structured forming belt or clothing for a machine for producing a fibrous web or a tissue web, the structured forming belt comprising:
a paper-contacting side;
a backing side;
a support structure; and
at least one layer of polymer foam providing said paper-contacting side being suitable for transferring a structure to the fibrous web, said at least one layer of polymer foam having a pore density of less than 30 PPI.

6. The structured forming belt according to claim 5 , wherein said structure is a uniform or non-uniform structure.

7. The structured forming belt according to claim 5 , wherein said at least one layer of polymer foam has an embossed, branded, etched, cut, or punched external structure.

8. The structured forming belt according to claim 5 , wherein said at least one layer of polymer foam is formed of or includes an elastomer or a polyurethane.

9. The structured forming belt according to claim 5 , wherein said at least one layer of polymer foam is formed of or includes polyamide, polyester, or polyethylene.

10. The structured forming belt according to claim 5 , wherein said at least one layer of polymer foam has an anisotropic pore structure.

11. The structured forming belt according to claim 5 , wherein said at least one layer of polymer foam is adhesively bonded, welded or NIR transmission welded to said support structure.

12. The structured forming belt according to claim 10 , wherein compression of the at least one layer of polymer foam results in pores having the anisotropic pore structure that are deformed in a thickness direction of said at least one layer of polymer foam.

13. A machine for producing a fibrous web or a tissue web, the machine comprising at least one structured forming belt according to claim 5 .

Assignees

• Voith Patent Gmbh

Inventors

• Eberhardt Robert
• Schmitt Matthias
• Opletal Frank

Classifications

• D21H27/02

  Patterned paper (patterned coatings D21H19/66; embossing B31F1/07; prepared on the paper-making machines D21F11/00) · CPC title

• D21F11/006 Primary

  Making patterned paper · CPC title

• D21H27/002

  Tissue paper; Absorbent paper (D21H21/22, D21H27/02, D21H27/20 take precedence; toilet paper A47K10/00; absorbent pads for physiological fluids A61L15/16; making on paper-making machines D21F11/00) · CPC title

• D21F1/80

  using endless screening belts · CPC title

• D21F11/14

  Making cellulose wadding, filter or blotting paper · CPC title