A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Lignin Inter-Diffusion Underlying Improved Mechanical Performance of Hot-Pressed Paper Webs (2021)
Mattsson, A., Joelsson, T., Miettinen, A., Ketoja, J. A., Pettersson, G., & Engstrand, P. (2021). Lignin Inter-Diffusion Underlying Improved Mechanical Performance of Hot-Pressed Paper Webs. Polymers, 13(15), Article 2485. https://doi.org/10.3390/polym13152485
JYU-tekijät tai -toimittajat
Julkaisun tiedot
Julkaisun kaikki tekijät tai toimittajat: Mattsson, Amanda; Joelsson, Tove; Miettinen, Arttu; Ketoja, Jukka A.; Pettersson, Gunilla; Engstrand, Per
Lehti tai sarja: Polymers
eISSN: 2073-4360
Julkaisuvuosi: 2021
Ilmestymispäivä: 28.07.2021
Volyymi: 13
Lehden numero: 15
Artikkelinumero: 2485
Kustantaja: MDPI AG
Julkaisumaa: Sveitsi
Julkaisun kieli: englanti
DOI: https://doi.org/10.3390/polym13152485
Julkaisun avoin saatavuus: Avoimesti saatavilla
Julkaisukanavan avoin saatavuus: Kokonaan avoin julkaisukanava
Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/77608
Tiivistelmä
Broader use of bio-based fibres in packaging becomes possible when the mechanical properties of fibre materials exceed those of conventional paperboard. Hot-pressing provides an efficient method to improve both the wet and dry strength of lignin-containing paper webs. Here we study varied pressing conditions for webs formed with thermomechanical pulp (TMP). The results are compared against similar data for a wide range of other fibre types. In addition to standard strength and structural measurements, we characterise the induced structural changes with X-ray microtomography and scanning electron microscopy. The wet strength generally increases monotonously up to a very high pressing temperature of 270 °C. The stronger bonding of wet fibres can be explained by the inter-diffusion of lignin macromolecules with an activation energy around 26 kJ mol−1 after lignin softening. The associated exponential acceleration of diffusion with temperature dominates over other factors such as process dynamics or final material density in setting wet strength. The optimum pressing temperature for dry strength is generally lower, around 200 °C, beyond which hemicellulose degradation begins. By varying the solids content prior to hot-pressing for the TMP sheets, the highest wet strength is achieved for the completely dry web, while no strong correlation was observed for the dry strength.
YSO-asiasanat: massa- ja paperiteollisuus; paperi; pakkausmateriaalit; valmistus; ekologisuus; kuidut; ligniini; diffuusio (fysikaaliset ilmiöt); lämpötila; vetolujuus; biotekniikka; biofysiikka
Vapaat asiasanat: kuumapuristus
Liittyvät organisaatiot
OKM-raportointi: Kyllä
Raportointivuosi: 2021
JUFO-taso: 1
