Method of improving paper machine fabric performance
Methods are provided for improving the papermaking process. In various embodiments, the methods include the application of alkali material in combination with an anionic polymeric dispersant and/or a hydroxyfunctional carboxylic acid to papermaking fabrics such that the application thereof removes contaminants from the papermaking fabrics and improves the drainage of said papermaking fabrics. Such alkali material in combination with an anionic polymeric dispersant and/or a hydroxyfunctional carboxylic acid can be applied as a single aqueous solution, and may further comprise a surfactant.
1. A method of treating and cleaning papermaking fabrics including one or more papermaking felts to increase a drainage rate, the method comprising:
applying an alkali material in combination with an anionic polymeric dispersant and a hydroxyfunctional carboxylic acid to the one or more papermaking felts of the papermaking fabrics as a single aqueous solution to increase a drainage rate through the papermaking fabrics, wherein the papermaking fabrics are contaminated with contaminants comprising wet soils that are hydrophilic and include papermaking fines, and wherein the single aqueous solution comprises a pH from about 9.5 to about 13.5 and a dynamic surface tension of about 25 mN/m to about 40 mN/m; and
based on the application of the single aqueous solution of the alkali material in combination with the anionic polymeric dispersant and the hydroxyfunctional carboxylic acid, removing the contaminants from the papermaking fabrics and improving the drainage of the one or more papermaking felts of the papermaking fabrics such that a resulting drainage rate from the single aqueous solution is higher than the drainage rate through application of the alkali material alone to the one or more papermaking felts of the papermaking fabrics.
2. The method of claim 1 , wherein the papermaking fabrics are contaminated with wet soils in an amount from about 0.1 to about 100% by weight.
3. The method of claim 1 , wherein the alkali material is selected from the group consisting of sodium hydroxide, potassium hydroxide, magnesium hydroxide, ammonia, sodium carbonate, sodium silicate, sodium phosphates, potassium phosphates, alcohol amines, and combinations thereof.
4. The method of claim 1 , wherein the anionic polymeric dispersant is selected from the group consisting of polyacrylic acid and sulfonated analogs and salts thereof, polymaleic acid and sulfonated analogs and salts thereof, poly(maleic anhydride) and sulfonated analogs and salts thereof, polyphosphinocarboxylic acid and sulfonated analogs and salts thereof, polyglutamic acid and sulfonated analogs and salts thereof, polyfumaric acid and sulfonated analogs and salts thereof, polylactic acid and sulfonated analogs and salts thereof, carboxylated vinyl polymers and sulfonated analogs and salts thereof, copolymers of acrylic acid and maleic acid and sulfonated analogs and salts thereof, and combinations thereof.
5. Method of claim 1 , wherein the aqueous solution comprises from about 1% to about 20% by weight anionic polymeric dispersant.
6. The method of claim 1 , wherein the hydroxyfunctional carboxylic acid is an alpha hydroxyl acid.
7. The method of claim 5 , wherein the alpha hydroxyl acid is selected from the group consisting of lactic acid, gluconic acid, glycolic acid, citric acid, mandelic acid, and potassium or sodium salts thereof.
8. The method of claim 1 , wherein the aqueous solution comprises from about 1% to about 20% by weight hydroxyfunctional carboxylic acid.
9. The method of claim 1 , further comprising applying a surfactant.
10. The method of claim 9 , wherein the surfactant is selected from the group consisting of nonionic surfactants, anionic surfactants, cationic surfactants, zwitterionic surfactants, and combinations thereof.
11. The method of claim 9 , wherein the surfactant is selected from the group consisting of dodecylbenzene sulfonate, sodium-1-octane sulfonate, sodium caprylyl sulfonate, alcohol ethoxylates, and combinations thereof.
12. The method of claim 1 , the aqueous solution further comprising a surfactant.
13. The method of claim 12 , wherein the aqueous solution comprises from about 1% to about 20% by weight surfactant.
14. The method of claim 12 , wherein the aqueous solution comprises from about 6% to about 18% by weight surfactant.
15. The method of claim 1 , wherein the method further comprises applying one or more compounds selected from the group consisting of sodium hypocholorite, peroxides, triethanolamine, ethylenediaminetetraacetic acid, nitrilotriacetic acid, sodium silicate, tetrasdoium pyrophosphate, sodium tripolyphosphate, 1-(2,5-dimethoxy-4-methylphenyl)propan-2-amine, and combinations thereof.
16. The method of claim 1 , wherein the aqueous solution further comprises one or more compounds selected from the group consisting of sodium hypocholorite, peroxides, triethanolamine, ethylenediaminetetraacetic acid, nitrilotriacetic acid, sodium silicate, tetrasdoium pyrophosphate, sodium tripolyphosphate, 1-(2,5-dimethoxy-4-methylphenyl)propan-2-amine, and combinations thereof.
17. The method of claim 1 , wherein contaminants comprise organic contaminants.
18. The method of claim 1 , wherein the papermaking fabrics comprise forming fabrics, press felt fabrics, and dryer fabrics.
19. The method of claim 1 , wherein the aqueous solution is applied to the papermaking fabrics at a dosage of about 100 ppm to about 50,000 ppm while a papermaking machine is operating.
20. The method of claim 1 , wherein the aqueous solution is applied to the papermaking fabrics at a dosage of about 0.1% to about 100% while a papermaking machine is not operating.
21. The method of claim 1 , wherein the aqueous solution is applied to the papermaking fabrics through high pressure needle showers, fan showers, flooded nip showers, manual foaming equipment, or manual spraying equipment.
22. The method of claim 18 , wherein the aqueous solution is applied to the papermaking fabrics continuously or intermittently.
23. The method of claim 1 , wherein the aqueous solution is applied to the papermaking fabrics at a temperature from about 50° C. to about 60° C.
24. The method of claim 2 , wherein the wet soils comprise of papermaking fibers and fines, hydrosols, hydrogels, or combinations thereof.
25. The method of claim 17 , wherein the organic contaminants comprise of wet soils.