Method and device for the production of a fibrous material web in a papermaking machine

Patent metadata

Field	Value
Publication number	US-11261567-B2
Application number	US-201816476158-A
Country	US
Kind code	B2
Filing date	Jan 17, 2018
Priority date	Feb 24, 2017
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A device and a method for the production of a fiber mat is suitable in particular for use in the production of packaging board or fibrous construction elements, from a fibrous source material. The method includes providing the fibrous source material, low-water processing of the fibrous source material in an airflow into raw material including individual fibers and/or fiber bundles, forming of the individual fibers and/or fiber bundles in the airflow by a dry forming method into a fiber mat in such a way that a spatial or three-dimensional structure is formed by the fiber mat and consolidation of the formed fiber mat. The specific volume of the fiber mat is greater than 1.6 cm3/g, in particular greater than 2 cm3/g, preferably greater than 3 cm3/g, and the fiber mat thickness ≥1 mm, in particular ≥1.5 mm, preferably ≥2 mm.

First claim

The invention claimed is:

1. A method for the production of a fiber mat suitable for use in the production of packaging board or fibrous construction elements from a fibrous source material, the method comprising the following steps:
a) providing the fibrous source material;
b) processing of the fibrous source material having a water content of less than 40% of a total mass of the source material in an airflow into raw material including at least one of individual fibers or fiber bundles;
c) forming the at least one of individual fibers or fiber bundles in the airflow by a dry forming method into a fiber mat having a three-dimensional structure; and
d) then consolidation of the formed three-dimensional fiber mat to provide a specific volume of the fiber mat greater than 1.6 cm 3 /g and a fiber mat thickness ≥1 mm.

2. The method according to claim 1 , which further comprises providing the specific volume of the fiber mat to be greater than 2 cm 3 /g and providing the fiber mat thickness to be ≥1.5 mm.

3. The method according to claim 1 , which further comprises providing the specific volume of the fiber mat to be greater than 3 cm 3 /g and providing the fiber mat thickness to be ≥2 mm.

4. The method according to claim 1 , wherein the fibrous source material at least partly includes virgin fibers, bamboo, straw, bagasse or recycled material.

5. The method according to claim 1 , which further comprises carrying out the method at locations in dry, water-deprived regions of tropical or subtropical climate zones or in a vicinity of or on site of mail-order companies or packaging manufacturers in industrialized regions.

6. The method according to claim 1 , which further comprises carrying out steps a) to d) to provide a ratio of a water content to a total mass of the source material and the raw material not exceeding 40%.

7. The method according to claim 1 , which further comprises carrying out steps a) to d) to provide a ratio of a water content to a total mass of the source material and the raw material not exceeding 30%.

8. The method according to claim 1 , which further comprises carrying out steps a) to d) to provide a ratio of a water content to a total mass of the source material and the raw material not exceeding 20%.

9. The method according to claim 1 , which further comprises carrying out processing step b) as at least one step selected from the following group:
comminution of the source material to a maximum size of 60 mm by 60 mm;
freeing the source material from impurities;
disaggregation of the source material into at least one of individual fibers or fiber bundles in at least one of high-consistency refiners or cross-flow defiberizers or mills; and
freeing at least one of the individual fibers or fiber bundles from impurities after the comminution step.

10. The method according to claim 1 , which further comprises carrying out forming step c) by applying the at least one of individual fibers or fiber bundles in the airflow to a surface of an air-permeable or air-impermeable support element.

11. The method according to claim 10 , which further comprises providing the air-permeable support element as a rotating or stationary belt or as a perforated roll or as a perforated plate.

12. The method according to claim 10 , which further comprises providing the surface of the support element with structures complementary to the three-dimensional structure of the fiber mat to be produced.

13. The method according to claim 1 , which further comprises adding a binding agent for binding the at least one of individual fibers or fiber bundles in at least one of steps b), c) or d).

14. The method according to claim 1 , which further comprises producing the fiber mat continuously.

15. The method according to claim 1 , which further comprises producing the fiber mat by the piece.

16. The method according to claim 1 , which further comprises producing the fiber mat as a multi-ply product.

17. A device for the production of a fiber mat suitable for the production of packaging board or fibrous construction elements from a fibrous source material, the device comprising:
a processing plant for processing of the fibrous source material having a water content of less than 40% of a total mass of the source material in an airflow into a raw material including at least one of individual fibers or fiber bundles;
a dry forming device for forming the at least one of individual fibers or fiber bundles in the airflow into a fiber mat having a spatial three-dimensional structure; and
a consolidation device disposed downstream of said dry forming device for consolidating the formed three-dimensional fiber mat to provide a specific volume greater than 1.6 cm 3 /g and a fiber mat thickness ≥1.

18. The device according to claim 17 , wherein said consolidation device consolidates the formed fiber mat to provide a specific volume greater than 2 cm 3 /g and a fiber mat thickness ≥1.5 mm.

19. The device according to claim 17 , wherein said consolidation device consolidates the formed fiber mat to provide a specific volume greater than 3 cm 3 /g and a fiber mat thickness ≥2 mm.

Assignees

• Voith Patent Gmbh

Inventors

• Kemper Martin
• Held Heiko
• Wagner Cordts Monteiro
• Martin Thomas

Classifications

• B32B2250/40

  Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA · CPC title

• B32B29/02

  next to a fibrous or filamentary layer · CPC title

• B27N3/12

  from fibres · CPC title

• B27N5/00

  Manufacture of non-flat articles · CPC title

• B32B2553/00

  Packaging equipment or accessories not otherwise provided for · CPC title