Formation of deformation and strength properties of bamboo pulp during the refining
https://doi.org/10.21266/2079-4304.2023.242.242-257
Abstract
Quantitative regularities have been established that describe the formation of deformation and strength properties of kraft unbleached pulp from bamboo Bambusa blumeana (Kappa number 17.3) during refining. The properties of the samples were studied on handheets 60 g/m2, made on an Estanit BBS-2 Rapid Ketten sheet former, after refining in a Yokro mill at a concentration of 6% to a refining degree of 20, 30, 40, and 60 SR. Tensile tests were carried out on samples with dimensions of 100 × 15 mm, the tensile rate was 50 mm/min. An analysis of the stress–strain curves showed that the change in the deformation behavior of bamboo pulp during refining is typical for pulp and paper materials. With an increase in the degree of refining, the curves go higher, the stiffness the deformation to failure and the breaking stress are increased. A comparison with hardwood and softwood pulps showed that the behavior of bamboo pulp during refining is similar to traditional pulps from northern woods. It is shown that the values of deformation and strength characteristics of bamboo pulp have lower values. However, the degree of change in the strength characteristics of bamboo as a result of refining is higher than that for softwood and hardwood pulps. The breaking length of bamboo during refining from 20 to 60 SR increases by 50% and approaches in value (8000 m) the values of hardwood and softwood pulp - 8200 m. To the greatest extent shows elongation to break, changes in bamboo pulp growth is 34–66%, and reaches a value of 3.73%, which is higher than that of hardwood (1.79%) and softwood (2.65%) pulp. Unlike hardwood and softwood pulp, when refining bamboo above 50 SR, there is no decrease in strength and elastic properties. At 60 SR, the tensile strength of bamboo pulp approaches that of hardwood and softwood, and the strain at fracture and TEA exceed them. Therefore, to achieve the required level of strength properties of bamboo pulp, refining to a higher degree of refining is required.
About the Authors
H. M. Khoa
Northern (Arctic) Federal University named after M.V. Lomonosov
Russian Federation
Russian Federation
KHOA Hoang M. – PhD student
163002. Severnaya Dvina Emb 17
ResearcherID: GXG-6942-2022
Y. V. Kazakov
Northern (Arctic) Federal University named after M.V. Lomonosov
Russian Federation
Russian Federation
KAZAKOV Yakov V. – DSc (Technical), Professor, Professor of the Department of Pulp and Paper and Wood Chemical Production
163002. Severnaya Dvina Emb. 17. Arkhangelsk
ResearcherID: J-4634-2012
Scopus Author ID: 57188686765
E. O. Okulova
Northern (Arctic) Federal University named after M.V. Lomonosov
Russian Federation
Russian Federation
OKULOVA Elena O. – training master of the Department of Pulp and Paper and Wood Chemical Production
163002. Severnaya Dvina Emb. 17. Arkhangelsk
ResearcherID: S-6096-2019
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Review
For citations:
Khoa H.M., Kazakov Y.V., Okulova E.O. Formation of deformation and strength properties of bamboo pulp during the refining. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii. 2023;(242):242–257. (In Russ.) https://doi.org/10.21266/2079-4304.2023.242.242-257
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