Performance Evaluation of Bar Plates without a Draft Angle to Improve Refining Efficiency

Min-Seok Lee; Chul-Hwan Kim; Ji-Young Lee; See-Han Park; Byeong-Geol Min

doi:10.7584/JKTAPPI.2019.10.51.5.84

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2019 Vol.51, Issue 5 Preview Page Next Page

Performance Evaluation of Bar Plates without a Draft Angle to Improve Refining Efficiency

30 October 2019. pp. 84-90

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Abstract

Most of the refiner plates currently in use are made via sand casting, so a draft angle is given to prevent damage to the mold; in addition, the draft angle can reduce the flow rate of the pulp stock and sharpness of the bar edge. In this study, the effect of a bar plate without a draft angle was compared by manufacturing the bar plate using lost-wax casting technology. The vertical bar had a larger cutting edge load and consumed less refining energy than the tapered bar until the target freeness was reached. Instead, more fiber cutting by the vertical bar caused more sacrifice of fiber length and more fines content, which resulted in a faster reduction in the tear strength properties of the paper. Moreover, the tensile and burst strength of the paper was more developed by the vertical bar plate. The rectangular groove inlet of the vertical bar had a larger surface area than the trapezoidal groove of the tapered bar, so more throughput of pulp stock could be processed in a certain period. In conclusion, the vertical bar-shaped plate is expected to yield better results than the tapered bar-shaped plate in terms of energy saving and refining effects on pulp fibers.

Keywords

Stock preparation

refining

energy

fine bar

vertical bar plate

References

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Information

Publisher :Korea Technical Association of The Pulp and Paper Industry
Publisher(Ko) :한국펄프종이공학회
Journal Title :Journal of Korea TAPPI
Journal Title(Ko) :펄프종이기술
Volume : 51
No :5
Pages :84-90
Received Date : 2019-09-19
Revised Date : 2019-10-04
Accepted Date : 2019-10-18
DOI :https://doi.org/10.7584/JKTAPPI.2019.10.51.5.84

Journal of Korea TAPPI ISSN:0253-3200(Print) 펄프종이기술

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