Water removal between wire and wet press of a paper mill process

Patent metadata

Field	Value
Publication number	US-11332885-B2
Application number	US-201916522969-A
Country	US
Kind code	B2
Filing date	Jul 26, 2019
Priority date	Aug 23, 2018
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

The present invention provides compositions comprising cellulose fibers and cellulose ester fibers and wet laid articles made from the compositions, as well as wet laid processes to produce these compositions. More specifically, the present invention provided compositions comprising cellulose fibers and cellulose acetate fibers and wet laid articles made from these compositions as well as wet laid processes to produce these compositions. The present invention also relates to developing a composition, process, wet laid product, or articles exhibiting any one of many desired benefits.

First claim

What we claim is:

1. A process to remove water from a composition comprising introducing said composition to a wire section in a paper mill process;
wherein said composition comprises cellulose fiber and a staple fiber; and wherein said water removed at said wire section is about 0.5% or more for said composition than a 100% cellulose comparative composition; wherein said staple fibers have a denier per filament (DPF) of 1.8 to less than 3; wherein said staple fibers are present in an amount from about 4 wt % to less than 16 wt %; wherein at least a portion of said staple fibers are combined with said cellulose fibers and co-refined; and wherein said staple fibers have a cut length of less than 6 mm and crimped.

2. The process according to claim 1 wherein the water removed in said wire section is increased by 1% or more.

3. The process according to claim 1 wherein the water removed in said wire section is increased by 1.5% or more.

4. The process according to claim 1 wherein the water removed in said wire section is increased by 2% or more.

5. The process according to claim 1 wherein said staple fiber comprises cellulose ester.

6. The process according to claim 5 wherein said cellulose ester is cellulose acetate.

7. The process according to claim 6 wherein a dryline in said paper mill is moved back toward a headbox with said composition by at 5 inches, relative to the dry line location using 100% cellulose comparative composition.

8. The process according to claim 6 wherein cellulose acetate is in an amount of about 0.1 to about 25 wt %.

9. The process according to claim 6 wherein said cellulose acetate is in an amount of about 0.1 to about 15 wt %.

10. The process according to claim 6 wherein said cellulose acetate is in an amount of about 0.1 to about 6 wt %.

11. The process according to claim 6 where said cellulose ester has a degree of substitution of less than 2.5.

12. The process according to claim 6 where said cellulose ester has a degree of substitution of less than 2.4.

13. The process according to claim 1 where said cellulose acetate has a degree of substitution of less than 2.5.

14. The process according to claim 1 where said cellulose acetate has a degree of substitution of less than 2.4.

Assignees

• Eastman Chem Co

Inventors

• Everett Charles Stuart
• Mitchell Melvin Glenn
• Parker Kenny Randolph
• Ghosh Koushik
• Izallalen Mounir

Classifications

• D21F1/024

  Details of the feed chamber · CPC title

• D21C9/18 Primary

  De-watering (de-watering in general F26B); {Elimination of cooking or pulp-treating liquors from the pulp}(D21C9/002, D21C9/02 take precedence; paper-making machines D21F; strainers in digesters D21C7/00; presses in general B30B) · CPC title

• D21H13/06

  Cellulose esters · CPC title

• D21H15/10

  Composite fibres · CPC title

• D21F1/80 Primary

  using endless screening belts · CPC title