Method for improving filler and fiber retention in paper making processes

Patent metadata

Field	Value
Publication number	US-10876258-B2
Application number	US-201816200954-A
Country	US
Kind code	B2
Filing date	Nov 27, 2018
Priority date	Nov 27, 2018
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

A process and device for improving filler retention of paper, paperboard, or cardboard. The process provides for an electromagnetic force being applied to a filler material and/or cellulosic furnish, thereby changing the surface charge of the filler material and/or cellulosic furnish and forming a paper, paperboard, or cardboard product.

First claim

What is claimed is:

1. A process for the production of paper, paperboard, or cardboard comprising:
providing a cellulosic furnish;
applying an electromagnetic force to one or more filler materials sufficient to change the surface charge of the filler material to produce one or more treated filler materials and optionally to the cellulosic furnish;
combining the cellulosic furnish with the one or more treated filler materials; and
forming a paper, paperboard or cardboard product from the filler material and cellulosic furnish.

2. The process according to claim 1 , wherein the step of applying the electromagnetic force comprises:
providing an electrical charge to a magnetic device to generate the electromagnetic force within a treatment zone; and
positioning the one or more filler materials and optionally the cellulosic furnish within the treatment zone.

3. The process according to claim 2 , wherein the magnetic device is disposed within a transfer vessel, and wherein the magnetic device is configured to apply an electromagnetic force sufficient to change the surface charge of the filler material as the filler material is positioned within the treatment zone.

4. The process according to claim 1 , wherein the electromagnetic force is 0.040 tesla or higher.

5. The process according to claim 4 , wherein the electromagnetic force is 0.20 tesla or higher.

6. The process according to claim 1 , wherein the filler is positioned in the treatment zone for at least 15 minutes.

7. The process according to claim 6 , wherein the filler material is positioned within the treatment zone for at least 60 minutes.

8. The process according to claim 1 , wherein the filler material is positioned within the treatment zone for at least 15 minutes, and the electromagnetic force is between 0.020 tesla and 0.40 tesla.

9. The process according to claim 1 , wherein the one or more filler materials is selected from the group of TiO 2 , ZnO, CaCO 3 , precipitated CaCO 3 , talc, gypsum and combinations thereof.

10. The process according to claim 1 , wherein the one or more filler materials is TiO 2 .

11. A cellulosic product produced by the process according to claim 1 .

12. The cellulosic product of claim 11 , wherein the cellulosic product formed from the filler material after application of the electromagnetic force exhibits an improved filler retention as compared to a cellulosic product formed from a filler material free from application of the electromagnetic force.

13. The cellulosic product of claim 11 , wherein the cellulosic product formed from the filler material after application of the electromagnetic force exhibits an improved brightness in accordance with ISO 2470-1 as compared to a cellulosic product formed from a filler material free from application of the electromagnetic force.

14. The cellulosic product of claim 11 , wherein the cellulosic product formed from the filler material after application of the electromagnetic force exhibits an improved opacity in accordance with ISO 2471-1 as compared to a cellulosic product formed from a filler material free from application of the electromagnetic force.

Assignees

• Solenis Tech Lp

Inventors

• Aittamaa Teemu

Classifications

• D21F1/02

  Head boxes of Fourdrinier machines · CPC title

• D21J1/00

  Fibreboard (preparation of pulp compositions or addition of chemical agents D21B, D21C, D21H; formation of the wet web D21F) · CPC title

• D21H23/20 Primary

  Apparatus therefor · CPC title

• D21H21/18

  Reinforcing agents · CPC title

• D21H21/10

  Retention agents or drainage improvers · CPC title