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Okayama, Takayuki; Kitayama, Takao; Oye, Raysabro

doi:10.2524/jtappij.35.1057

Cited by 6 publications

(2 citation statements)

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“…Therefore, it was suggested that the first recycling treatment out of the three recycling treatments had a particularly large effect on the wettability of pulp fibers. The increase in contact angle due to the recycling process of pulp fiber can be caused by both the hornification of the pulp fiber surface shown in the decrease in pore volume in the fiber cell wall 12 , 15 , and the decrease in surface bonding potential 30 , 32 , 33 .…”

Section: Resultsmentioning

confidence: 99%

“…The solute exclusion method utilizes the phenomenon that solute molecules invade pores in the cell wall according to the molecular diameter when the wet pulp is immersed in monosaccharides and dextran aqueous solutions having various molecular diameters. It was found by using the solute exclusion method that the pore volume in cell wall of the pulp fibers decreased with the number of recycling increased 10 , 12 . Stone and Scallan 13 also noted significant decreases in the specific surface areas of once-dried bleached sulfite pulp by using nitrogen adsorption technique.…”

Section: Introductionmentioning

confidence: 99%

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Relationship between wettability of pulp fibers and tensile strength of paper during recycling

Jin

Kose

Akada

et al. 2022

Sci Rep

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The wettability of the paper surface is greatly affected by the wettability of the pulp fibers. We conducted this study in order to understand the relationship between the wettability of a single fiber of recycled pulp and the strength of recycled paper, as well as the inter-fiber bonding strength. The contact angle was determined from a series of photographs of the pulp fiber and the water silhouettes at the point of contact. The contact line and profile history were continuously photographed in every 1 s after the initial contact. The recycled softwood kraft pulp fibers were clearly much less hydrophilic than the original fibers, regardless of whether the fibers had been bleached or not. The contact angle of the original chemi-thermomechanical pulp fiber was much higher than that of the original softwood bleached kraft pulp fiber. Furthermore, increased number of recycling decreased the contact angle of the chemi-thermomechanical pulp fiber. The Page equation was used to evaluate the strength contributions of single fiber and fiber–fiber bonding to tensile strength of paper. As a result, an increase in weakness factor of fiber–fiber bonding strength was obtained for the recycled softwood kraft pulp handsheet. On the other hand, the weakness factor of the original chemi-thermomechanical pulp handsheet decreased with recycling. In addition, the weakness factor of fiber–fiber bonding strength and the contact angles of the provided softwood bleached kraft pulp fibers bore a proportional relationship to each other.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%