Strength improvement via sprayboom application
AssigneeEcolab USA Inc.
InventorsDavid Steven JORDAN, Heqing HUANG, Weiguo CHENG, Mingli WEI, Mei LIU, William Arthur GRANGER
Life of this patent
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Abstract
The present disclosure provides methods and compositions for strengthening paper. The methods may include a step of spraying an anionic polymer onto a paper sheet to increase the strength of the paper sheet. The anionic polymer may have amino groups, amide groups, or a combination of amino groups and amide groups. These groups may be functionalized with an aldehyde. Methods may also include a step of adding a wet end composition to a wet end of the papermaking process.
Claims23
A method for enhancing the strength of a paper sheet, comprising:
- adding an effective amount of a wet end composition to a furnish comprising a pulp in a wet end of a papermaking process, wherein the wet end composition comprises a cationic polymer or an amphoteric polymer with a net positive charge,
- forming a paper sheet from the pulp, and
- spraying an effective amount of a composition onto the paper sheet, the composition comprising an anionic polymer comprising amino groups, amide groups, or a combination thereof, wherein at least a portion of the amino groups and/or the amide groups are functionalized with an aldehyde.
A method for enhancing the strength of a paper sheet, comprising:
- spraying an effective amount of a composition onto the paper sheet, the composition comprising water and an anionic polymer comprising amino groups, amide groups, or a combination thereof, wherein at least a portion of the amino groups and/or the amide groups are functionalized with an aldehyde, wherein the paper sheet comprises a top ply, a bottom ply, and a filler ply disposed between the top ply and the bottom ply.
13-14. (canceled)
17-19. (canceled)
A method for enhancing the strength of a paper sheet, comprising:
- spraying an effective amount of a composition onto the paper sheet, the composition comprising water and an anionic polymer comprising amino groups, amide groups, or a combination thereof, wherein at least a portion of the amino groups and/or the amide groups are functionalized with an aldehyde, wherein the paper sheet comprises a top ply and a bottom ply, wherein the composition is sprayed at a location selected from the group consisting of a top side of the top ply, a top side of the bottom ply, a bottom side of the bottom ply, and any combination thereof.
26-29. (canceled)
Dependencies are inferred from the claim text.