Effect of Vibration in Forming Tank of WEPS on Retention, Drainage, and Formation of Handsheets; WEPS의 탈수 시 포밍탱크의 진동이 수초지의 보류와 탈수, 지합에 미치는 영향

초록

In this study, the effects of the intensity of vibrations applied to the forming fabric during the WEPS sheet forming process, which involves vacuum-applied dewatering, on the retention, drainage, and formation of hardwood and softwood pulp stocks were explored. It was found that as the intensity of vibrations increased during the WEPS sheet forming, the drainage of hardwood pulp stock improved, while the drainage of softwood pulp stock deteriorated. Although the changes in retention and formation of hardwood pulp were minimal, significant improvements in the retention and formation of softwood pulp were observed. Specifically, in the case of hardwood pulp, introducing vibrations during vacuum dewatering delayed the initial consolidation of wet web and improved drainage without greatly affecting retention and formation. For softwood pulp, which typically has poor formation and high wet web density, introducing vibrations improved retention and formation but could lead to a decrease in drainage efficiency. Given that the traditional CSF values measured to predict pulp drainage efficiency are not suitable for representing drainage in actual papermaking machines, it was confirmed that comprehensive analysis of retention, drainage, and formation should be conducted by introducing vibrations during vacuum dewatering in laboratory-scale papermaking experiments simulating actual field conditions using WEPS. © 2024 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

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