Application of Fracture Toughness Understanding to Improve Papermaking Runnability

Jong-Moon Park

doi:10.7584/JKTAPPI.2022.2.54.1.3

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Application of Fracture Toughness Understanding to Improve Papermaking Runnability 파괴인성을 통한 초지 운전율 향상 방안

28 February 2022. pp. 3-9

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Abstract

Runnability of paper is important for increasing the productivity of papermaking, converting, and printing processes. Fracture mechanics theories have been applied to paper for reducing paper breaks and improving their runnability. Fracture toughness has a stronger effect on the paper break phenomenon than tensile strength. Paper breaks when a higher force is applied to paper during the papermaking process than the paper can hold. Efficient methods to improve the toughness of paper will be beneficial to reduce paper breaks. In this study, various factors such as fiber length, intrinsic fiber strength, coarseness, refining, addition ratio of Kraft pulp (KP) related to the fracture toughness of paper were reviewed. Further, the effects of the fiber properties, extent of refining, mixing ratio of KP, recycled fibers and fillers, and moisture content were analyzed. The following were beneficial for increasing the fracture toughness of paper: long fiber length, high intrinsic fiber strength, low fiber coarseness, high refining, high addition ratio of KP for the strengthening effect, low recycling pulp and filler addition ratio, and high moisture content of paper. The mixing ratio of KP had strong effects on improving the fracture toughness whereas the refining effects had weak effects on that. Regarding fiber shapes, straight fibers had a high critical fracture load, whereas curly fibers resulted in a high critical fracture elongation. In the future, detailed research on the fracture toughness of paper is needed, including the dynamic factors, for better understanding of paper breaks during papermaking processes.

Keywords

Fracture toughness

fracture mechanics

paper

break

application

runnability

critical load

critical elongation

factors

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 : 54
No :1
Pages :3-9
Received Date : 2022-01-20
Revised Date : 2022-02-07
Accepted Date : 2022-02-09
DOI :https://doi.org/10.7584/JKTAPPI.2022.2.54.1.3

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

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