섬유 특성에 따른 종이의 물리적, 파괴 역학적 특성 변화

Change of Paper's Physical and Fracture Mechanical Properties Depending on Fibers Properties

  • 이진호 (충북대학교 농과대학 산림과학부) ;
  • 박종문 (충북대학교 농과대학 산림과학부)
  • 발행 : 2003.09.01

초록

Physical properties of paper can be explained in terms of the changes in fiber's morphological properties. As the paper machine speed increases, the basis weight decreases and the mixing ratio of inferior recycled fibers increases, paper break becomes important than ever before. One of the objectives of this study is to analyze paper's physical, mechanical and fracture mechanical properties depending on softwood(SW) and hardwood(HW) mixing ratios and recycling. Fibers were refined by Valley beater to 450 mL CSF. Handsheets of 30 g/$\textrm{m}^2$ were prepared at different mixing ratios. Fracture toughness was measured as the amount of energy applied to cracked sample before total failure. Fracture toughness showed different trend to other strength properties. At the mixing ratio of SW 80: HW 20, papers showed the maximum fracture toughness. At this mixing ratio, flexible softwood fibers were mostly broken and stiff hardwood fibers were mostly pulled out.

키워드

참고문헌

  1. Tappi International Paper Physics Conference Fracture mechanics- A tool for evaluating the effect of reinforcement pulps in mechanical pulps Christer,F.;Melander,J.;Mohlin,U.B.
  2. 서울대학교, 박사학위논문 투과광 走査機의 화상분석법에 의한 종이의 물성 평가 조용민
  3. State University of New York, Ph. D. Thesis Study of Yield and Fracture of Paper Park,J.M.
  4. 한국경제신문 파괴역학 응용과 기초 Anderson,T.I.;이억섭;김정규(옮김)
  5. 1991 International Paper Physical Conference Influence of morphological properties of softwood fibers on sulfate pulp fiber and paper properties Paavilainen,L.
  6. CPPA Annual Meeting Preprints v.77B Importance of fiber coarseness for pulp properties Seth,R.S.
  7. Transactions of the 4th Fundamental Research Symposium-Oxford A new theory of the shrinkage, structure, and properties of paper, Formation and Structure of Paper Page,D.H.;Tydeman,P.A.
  8. Tappi J. v.78 no.10 Measurement of in-plane fracture toughness Seth,R.S.