Enhancing wet strength with less PAE: a study on oxygen delignified softwood pulps
Source abstract
Abstract
Abstract This study explores the potential to reduce the use of polyamidoamine-epichlorohydrin (PAE) wet-strength additives in tissue paper by replacing fully bleached fibers with oxygen delignified softwood pulps. Laboratory isotropic 20 g/m 2 hand sheets were produced from commercial fully bleached pulp (reference pulp), unbleached kraft pulp, and oxygen delignified pulps with varying lignin contents and fiber charge levels. The impact of PAE, alone and in combination with carboxymethylcellulose (CMC) was evaluated for both unrefined and PFI refined pulps. The unbleached kraft pulps and oxygen delignified pulps characterized by different lignin contents and total fiber charge levels, exhibited significantly higher fiber swelling and enhanced wet tensile strength compared to the fully bleached pulp. Notably, the use of oxygen delignified pulps enabled up to a five-fold reduction in PAE requirement while maintaining comparable wet tensile strength. Beyond performance gains, these pulps offer sustainability advantages by reducing the extent of delignification and eliminating the need for full bleaching. The findings highlight the role of fiber chemistry – particularly lignin content and fiber charge – in wet strength development, and suggest a promising pathway toward more resource-efficient tissue products.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Advanced Cellulose Research Studies · Lignin and Wood Chemistry · Enzyme-mediated dye degradation
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Sustainable Materials and Packaging Department , RISE Research Institutes of Sweden, Bioeconomy , Drottning Kristinas väg 61, SE-114 28 , Stockholm , Sweden
References (45)
Show source-provided references
1. Bates, N. (1969). Polyamide-epichlorohydrin wet-strength resin. I. Retention by pulp. Tappi J. 52.
2. Beuther, P.D., Veith, M.W., and Zwick, K.J. (2010). Characterization of absorbent flow rate in towel and tissue. J. Eng. Fiber Fabr. 5: 1–7, https://doi.org/10.1177/155892501000500201.10.1177/155892501000500201 ↗
3. Brito, A., Suarez, A., Pifano, A., Reisinger, L., Wright, J., Saloni, D., Kelley, S., Gonzalez, R., Venditti, R., and Jameel, H., et al.. (2023). Environmental life cycle assessment of premium and ultra hygiene tissue products in the United States. BioReso. 18: 4006–4031, https://doi.org/10.15376/biores.18.2.4006-4031.10.15376/biores.18.2.4006-4031 ↗
4. Buchert, J., Bergnor, E., Lindblad, G., Viikari, L., and Ek, M. (1997). Significance of xylan and glucomannan in the brightness reversion of kraft pulps. Tappi J. 80: 165–171.
5. Buchert, J., Tenkanen, M., and Tamminen, T. (2001). Characterization of carboxylic acids during kraft and superbatch pulping. Tappi J. 84.
6. Chai, X.-S., Hou, Q., and Zhu, J. (2003). Carboxyl groups in wood fibers. 2. The fate of carboxyl groups during alkaline delignification and its application for fiber yield prediction in alkaline pulping. Ind. Eng. Chem. Res. 42: 5445–5449, https://doi.org/10.1021/ie0209733.10.1021/ie0209733 ↗
7. Dang, Z., Elder, T., and Ragauskas, A.J. (2006). Influence of kraft pulping on carboxylate content of softwood kraft pulps. Ind. Eng. Chem. Res. 45: 4509–4516, https://doi.org/10.1021/ie060203h.10.1021/ie060203h ↗
8. Dunlop-Jones, N. (1991). Wet-strength chemistry. Paper chemistry. Springer, Netherlands.10.1007/978-94-011-6474-0_6 ↗
9. Espy, H.H. (1995). The mechanism of wet-strength development in paper: a review. Tappi J. 78: 90–100.
10. Espy, H.H. and Rave, T. (1988). The mechanism of wet-strength development by alkaline-curing amino polymer-epichlorohydrin resins. Tappi j. 71: 133–137.
11. Esteves, C.V. (2022). Pulp strength enhancement by oxygen delignification. KTH Royal Institute of Technology, Stockholm PhD Thesis.
12. Esteves, C.V., Brännvall, E., Östlund, S., and Sevastyanova, O. (2022). The efects of high alkali impregnation and oxygen delignifcation of softwood kraft pulps on the yield and mechanical properties. Nord. Pulp Pap. Res. J. 37: 223–231, https://doi.org/10.1515/npprj-2022-0022.10.1515/npprj-2022-0022 ↗
13. Esteves, C.V., Sevastyanova, O., Östlund, S., and Brännvall, E. (2021). Differences and similarities between kraft and oxygen delignification of softwood fibers: effects on chemical and physical properties. Cellulose 28: 3149–3167, https://doi.org/10.1007/s10570-021-03713-0.10.1007/s10570-021-03713-0 ↗
14. Esteves, C.V.G. (2024). Evaluation of oxygen delignified fibers with high water absorbency, as a greener alternative to fully bleached fibers for tissue paper. Nord. Pulp Pap. Res. J. 39: 527–539, https://doi.org/10.1515/npprj-2024-0024.10.1515/npprj-2024-0024 ↗
15. Feber, D., Granskog, A., Lingqvist, O., and Nordigården, D. (2020). Sustainability in packaging: inside the minds of US consumers [Online]. McKinsey & Company, Available https://www.mckinsey.com/industries/paper-forest-products-and-packaging/our-insights/sustainability-in-packaging-inside-the-minds-of-us-consumers (Accessed 082023).
16. Fišerová, M., Gigac, J., Stankovska, M., and Opalena, E. (2019). Influence of bleached softwood and hardwood kraft pulps on tissue paper properties. Cell. Chem. Technol. 53: 469–477, https://doi.org/10.35812/cellulosechemtechnol.2019.53.47.10.35812/CelluloseChemTechnol.2019.53.47 ↗
17. Gärdlund, L., Wågberg, L., and Gernandt, R. (2003). Polyelectrolyte complexes for surface modification of wood fibres: II. Influence of complexes on wet and dry strength of paper. Colloids Surf. A: Physicochem. Engin. Aspects 218: 137–149, https://doi.org/10.1016/s0927-7757(02)00588-5.10.1016/S0927-7757(02)00588-5 ↗
18. Häggkvist, M., Solberg, D., Wågberg, L., and Ödberg, L. (1998). The influence of two wet strength agents on pore size and swelling of pulp fibres and on tensile strength properties. Nordic pulp & paper research. Journal 13: 292–298.10.3183/npprj-1998-13-04-p292-298 ↗
19. Haller, K., Lee, J. & Cheung, J. 2020. Meet the 2020 consumers driving change. IBM Institute for Business Value. https://www.ibm.com/downloads/cas/EXK4XKX8 (Accessed on 29 March 2021).
20. Joelsson, T. (2021). The influence of pulp type and hot-pressing conditions on paper strength development. Mid Sweden University, Sundsvall, PhD thesis.
21. Jour, P., Halldén, K., and Wackerberg, E. (2013). Environmental systems analysis of alternative bleaching sequences with focus on carbon footprint. In: Proceedings of the ABTCP, the 46th ABTCP International Pulp and Paper Congress. ABTCP (Associação Brasileira Técnica de Celulose e Papel), São Paulo, Brazil, pp. 8–10.
22. Katz, S., Beatson, R.P., and Scallan, A.M. (1983). The determination of strong and weak acidic groups in sulfite pulps. Sven. Papperstidn. 86: R48–R53.
23. Kullander, J. (2012). Evaluation of furnishes for tissue manufacturing. Karlstads universitet, Karlstad, PhD Thesis.10.3183/npprj-2012-27-05-p947-951 ↗
24. Laine, J., Lindström, T., Nordmark, G.G., and Risinger, G. (2002). Studies on topochemical modification of cellulosic fibres: part 3. The effect of carboxymethyl cellulose attachment on wet-strength development by alkaline-curing polyamide-amine epichlorohydrin resins. Nord. Pulp Pap. Res. J. 17: 57–60, https://doi.org/10.3183/npprj-2002-17-01-p057-060.10.3183/npprj-2002-17-01-p057-060 ↗
25. Mai, J. (2021). Development of pulp fiber charge in oxygen delignification of softwood. In: Master degree master thesis. KTH, Stockholm.
26. Man, Y., Li, J., Hong, M., and Han, Y. (2020). Energy transition for the low-carbon pulp and paper industry in China. Renew. Sustain. Energy Review. 131: 109998, https://doi.org/10.1016/j.rser.2020.109998.10.1016/j.rser.2020.109998 ↗
27. Mohlin, U.B. and Alfredsson, C. (1990). Fibre deformation and its implications in pulp characterization. Nord. Pulp Pap. Res. J. 5: 172–179, https://doi.org/10.3183/npprj-1990-05-04-p172-179.10.3183/npprj-1990-05-04-p172-179 ↗
28. Ntifafa, Y., Ji, Y., and Hart, P.W. (2024). Understanding polyamidoamine epichlorohydrin (PAAE) retention in paper. BioReso. 19: 4568–4589, https://doi.org/10.15376/biores.19.3.4568-4589.10.15376/biores.19.3.4568-4589 ↗
29. Obokata, T. and Isogai, A. (2007). The mechanism of wet-strength development of cellulose sheets prepared with polyamideamine-epichlorohydrin (PAE) resin. Colloids Surf. A: Physicochem. Engin. Aspects 302: 525–531, https://doi.org/10.1016/j.colsurfa.2007.03.025.10.1016/j.colsurfa.2007.03.025 ↗
30. Obokata, T. and Isogai, A. (2009). Paper chemistry: wet-strength development of cellulose sheets prepared with polyamideamine-epichlorohydrin (PAE) resin by physical interactions. Nord. Pulp Pap. Res. J. 24: 135–140.10.3183/npprj-2009-24-02-p135-140 ↗
31. Rebola, S.M., Azevedo, C.A., and Evtuguin, D.V. (2021). Effect of cooking and bleaching conditions on the properties of eucalyptus kraft fluff pulps. Cellulose 28: 4411–4426, https://doi.org/10.1007/s10570-021-03789-8.10.1007/s10570-021-03789-8 ↗
32. Sjöström, E. (1989). The origin of charge on cellulosic fibers. Nord. Pulp Pap. Res. J. 4: 90–93, https://doi.org/10.3183/npprj-1989-04-02-p090-093.10.3183/npprj-1989-04-02-p090-093 ↗
33. Snowman, V.R., Genco, J.M., Cole, B.J., Kwon, H.B., and Miller, W.J. (1999). Bond strength of oxygen-delignified kraft pulps. Tappi J. 82: 103–109.
34. Stratton, R.A. (1989). Dependence of sheet properties on the location of adsorbed polymer. Nord. Pulp Pap. Res. J. 4: 104–112, https://doi.org/10.3183/npprj-1989-04-02-p104-112.10.3183/npprj-1989-04-02-p104-112 ↗
35. Su, J., Mosse, W.K., Sharman, S., Batchelor, W., and Garnier, G. (2012). Paper strength development and recyclability with polyamideamine-epichlorohydrin (PAE). BioReso. 7: 913–924, https://doi.org/10.15376/biores.7.1.913-924.10.15376/biores.7.1.913-924 ↗
36. Swerin, A. and Wågberg, L. (1994). Size-exclusion chromatography for characterization of cationic polyelectrolytes used in papermaking. Nord. Pulp Pap. Res. J. 9: 18–26, https://doi.org/10.3183/npprj-1994-09-01-p016-017.10.3183/npprj-1994-09-01-p016-017 ↗
37. Tao, L., Genco, J.M., Cole, B.J., and Fort Jr, R.C. (2011). Selectivity of oxygen delignification for southern softwood kraft pulps with high lignin content. Tappi J. 10: 29–39, https://doi.org/10.32964/tj10.8.29.10.32964/TJ10.8.29 ↗
38. Wågberg, L. (2000). Polyelectrolyte adsorption onto cellulose fibres–A review. Nord. Pulp Pap. Res. J. 15: 586–597, https://doi.org/10.3183/npprj-2000-15-05-p586-597.10.3183/npprj-2000-15-05-p586-597 ↗
39. Wågberg, L. and Bjőrklund, M. (1993). On the mechanism behind wet strength development in papers containing wet strength resins. Nord. Pulp Pap. Res. J. 8: 53–58, https://doi.org/10.3183/npprj-1993-08-01-p053-058.10.3183/npprj-1993-08-01-p053-058 ↗
40. Westfelt, L. (1979). Chemistry of paper wet strength. I. A survey of mechanisms of wet-strength development. Cellulose Chem. Tecnol. 13: 813–825.
41. Yang, R., Lucia, L., Ragauskas, A.J., and Jameel, H. (2003). Oxygen delignification chemistry and its impact on pulp fibers. J. Wood Chem. Technol. 23: 13–29, https://doi.org/10.1081/wct-120018613.10.1081/WCT-120018613 ↗
42. Zambrano, F., Marquez, R., Vera, R., Jameel, H., Venditti, R., and Gonzalez, R. (2022). Developing alternative, high-absorbency brown fibers: tissue paper from upcycled corrugated packaging waste to meet new consumer trends. ACS Sustain. Chem. Eng. 10: 13343–13356, https://doi.org/10.1021/acssuschemeng.2c03280.10.1021/acssuschemeng.2c03280 ↗
43. Zhang, D., Chai, X.S., Hou, Q., and Ragauskas, A. (2005). Characterization of fiber carboxylic acid development during one-stage oxygen delignification. Ind. Eng. Chem. Res. 44: 9279–9285, https://doi.org/10.1021/ie050489a.10.1021/ie050489a ↗
44. Zhang, D., Pu, Y., Courchene, C., Chai, X.S., and Ragauskas, A. (2006). Total fibre charge of fully bleached SW kraft pulps: a comparative study. J. Pulp Pap. Sci. 32: 231–237.
45. Zhao, C., Zhang, H., Zeng, X., Li, H., and Sun, D. (2016). Enhancing the inter-fiber bonding properties of cellulosic fibers by increasing different fiber charges. Cellulose 23: 1617–1628, https://doi.org/10.1007/s10570-016-0941-y.10.1007/s10570-016-0941-y ↗