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Study on the High-consistency Refining Process of Bleached Softwood and Hardwood Mixed Pulps for Tissue Paper Production
Received:August 04, 2023  
DOI：10.11980/j.issn.0254-508X.2024.05.007
Key Words:tissue paper  high-consistency refining  fines content  bulk  fiber ratio
Author NameAffiliationPostcode
CHEN Xuemei China National Pulp and Paper Research Institute Co.， Ltd.， Beijing ， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
ZHANG Quan* China National Pulp and Paper Research Institute Co.， Ltd.， Beijing ， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
CHEN Linghua China National Pulp and Paper Research Institute Co.， Ltd.， Beijing ， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
ZHANG Hongjie* China National Pulp and Paper Research Institute Co.， Ltd.， Beijing ， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
ZHANG Xue China National Pulp and Paper Research Institute Co.， Ltd.， Beijing ， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
CHENG Yun China National Pulp and Paper Research Institute Co.， Ltd.， Beijing ， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
HOU Leilei China National Pulp and Paper Research Institute Co.， Ltd.， Beijing ， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
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Abstract:The effects of different refining processes on the fiber properties of mixed pulp of bleached softwood pulp and bleached hardwood pulp （mass ratio of 30∶70） and the physical properties of handsheets for tissue paper were investigated by four processes： high-consistency refining on production line （HC pulp）， high-consistency refining on production line + low-consistency refining on lab （HC+LC pulp）， low-consistency refining on production line （LC pulp）， low-consistency refining on lab （lab pulp）. Through these four refining processes， the HC pulp， HC+LC pulp， LC pulp， and lab pulp were obtained， respectively. The results showed that compared with the LC pulp， the HC pulp contained fewer fine fibers， the fiber kink index was more obvious， and the prepared handsheet had better bulk， softness and water absorption. HC+LC pulp had a higher fiber kink index and a lower content of fine fibers than LC pulp. Among them， the tensile index， bulk， softness and water absorption of HC+LC handsheet were better than that of LC handsheet when the pulp concentration of high-consistency refining on production line was 18%， and the tensile index and water absorption of HC+LC handsheet （long fiber ratio of 30%， refining degree 23 °SR） were similar to those of the lab handsheet（long fiber ratio of 35%， refining degree 23 °SR）， with 5.7% higher bulk and 27.6% lower softness.
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