Analysis of Fiber Orientation of Paper Using Pilot Machine with Open Headbox (3) - Effect of Stock Concentration and Feeding Speed

Kyoung-Hwa Choi; Kwang Seob Lee; Jeong-Yong Ryu

doi:10.7584/JKTAPPI.2025.12.57.6.103

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2025 Vol.57, Issue 6 Preview Page Next Page

Original Paper

Analysis of Fiber Orientation of Paper Using Pilot Machine with Open Headbox (3) - Effect of Stock Concentration and Feeding Speed 오픈 헤드박스형 파일럿 초지기의 섬유 배향 분석(3) - 지료 농도 및 사출 속도에 따른 영향

30 December 2025. pp. 103-110

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Abstract

This study investigated the potential to improve fiber orientation in paper by controlling stock concentration and feed speed during papermaking, using a pilot-scale wet-web forming machine equipped with an open-type headbox. To regulate jet velocity at the slice outlet of the headbox, stock concentration was varied, and the pumping speed of the stock supply was adjusted accordingly. Paper sheets were then fabricated under each condition, and their physical properties, including grammage, formation, and tensile strength in both the machine direction (MD) and cross direction (CD), were quantified and compared. The results revealed that increasing both stock concentration and jet velocity raised grammage and thickness by increasing the amount of stock delivered per unit area of the wire, thereby enhancing sheet-forming capacity. At higher stock concentrations, faster consolidation reduced fiber non-uniformity in the CD, which led to a notable increase in tensile strength in the CD and, consequently, a higher CD/MD tensile index ratio. Furthermore, higher jet velocity intensified turbulence from the stock’s impact on the turbulence plate in the headbox, which suppressed excessive fiber alignment in the MD and further improved CD tensile strength. These findings demonstrate that appropriate control of stock concentration and jet velocity during the forming process can effectively regulate fiber orientation and improve sheet uniformity inpapermaking.

Keywords

Fiber orientation

CD/MD tensile index ratio

stock concentration

stock outlet speed

pilot-scale wet-web forming machine

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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 : 57
No :6
Pages :103-110
Received Date : 2025-11-10
Revised Date : 2025-11-25
Accepted Date : 2025-11-25
DOI :https://doi.org/10.7584/JKTAPPI.2025.12.57.6.103

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

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