Journal of Korea Technical Association of The Pulp and Paper Industry (펄프종이기술)

Korea Technical Association of the Pulp and Paper Industry (한국펄프종이공학회)
권호 표지

Systematic Study of Paper Breaks in Papermaking Process Using Fracture Mechanics - (1) Evaluation of fracture Toughness in Wet State

  • Seo, Yung-B (Dept. of Forest Products, College of Agriculture, Chungnam National Univ) ;
  • Roh, You-Sun (Dept. of Forest Products, College of Agriculture, Chungnam National Univ)
  • Published : 2001.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

Fracture toughness was considered as one of the good estimates of the paper break tendency of paper web in the press room. Paper break on the paper machine is caused by many factors such as paper machine irregular vibrations, impurities in the fiber furnish, shives, and so on. On the paper machine, the solid content of paper web is changing very rapidly from less than 1% to over 95%. We tried to measure the fracture toughness of paper web at different solid contents for providing the fundamental knowledge of paper break. Stretches of wet web were also measured and compared to the fracture toughness changes. Four different fiber furnishes (SwBKP, HwBKP, ONP, and OCC) were refined to different degrees, and at different solid contents (40%, 60%, 80% and 95%), their fracture toughnesses were measured. Two fracture toughness measurement methods (essential work of fracture and Tryding's load-widening method) were used, and we found they gave identical results. The stretch curves of the wet webs against the axis of solid contents were very similar to the fracture toughness curves of those.

Keywords

References

  1. Tappi J. v.79 no.2 Tenacity, fracture mechanics, and unknown coater web breaks Swinehart, D. E.;Broek, D.
  2. Tappi J. v.79 no.1 Opimizing reinforcement pulps by fracture toughness Seth, R. S.
  3. Tappi J. v.79 no.5 The fracture behavior of TMP/kraft blends Kazi, S. M.;Kortschot, M. T.
  4. Products of Papermaking, Transactions of the $10^{th}$ Fundamental research Symposium Held at Oxford v.III Plane stress fracture toughness and its measurement for paper Seth, R.
  5. Tappi J. v.76 no.2 Plane atress fracture toughness of paper Seth, R.;Robertson, A. G.;Mai, Y. W.;Hoffmann, J. D.
  6. Int. J. Fract. v.32 Onr the essential work of ductile fracture in polymers Mai, Y. W.;Cottrtrll, B.
  7. Polym. Eng. Sci. v.27 no.11 The essential work of plane stress ductile fracture of linear polyethylenes Mai, Y. W.;Cotterell, B.;Horlyck, R.;Vigna, G.
  8. J. Mater. Sci. v.28 Fracture toughness and fracture mechanism of PBT/PC/IM blend: Part 1 Fracture properties Wu, J.;Mai, Y. W.;Cotterell, B.
  9. J. Mater. Csi. v.27 Plane-stress essential work of ductile fracture for polycarbonate Paton, C. A.;Hashemi, S.
  10. Korea Tappi v.31 no.5 Yield and fracture of paper Patk, J. M.;Thorp, J. L.
  11. Handbook of Physical and Mechanical Testing of Paper and Paperboard v.1 Uesaka, T.;Mark, R. E.(Ed.)
  12. Tappi J. v.33 no.6 Uesaka, T.;Okaniwa, H.;Murakami, K.
  13. ASTM STP v.514 Berley, J. A.;Landes, J. D.
  14. ASTM STP v.536 Rice, J. R.;Paris, P. C.;Merkle, J. G.
  15. Products of Papermaking, Transactions of the $10^{th}$ Fundamental research Symposium Held at Oxford v.II The J-integral as a parameter for charecterizing the fracture toughness of paper Yuhara, T.;Kortschot, M. T.
  16. Tappi J. v.83 no.2 Characterization of tensile fracture properties of paper Tryding, J;Gustafsson, P. J.