New Concept of Stiffness Improvement in Paper and Board

  • Seo, Yung B. (Department of Forest Products, College of Agriculture, Chungnam National University)
  • Published : 2002.12.01

Abstract

A new concept of stock preparation for the increase of bending stiffness in paper and board was proposed. The "stiff" fibers, which were mechanically not treated or treated slightly to remove fiber curls, were combined with extensively refined fibers (ERF) to produce higher stiffness papers than those where the whole fibers were refined. The combination of "stiff" fibers and extensively refined fibers produced higher stiffness at the same tensile strength than the control furnish, in which all the fibers are refined together. In this concept, the fibers from recycled papers could be as much useful as the virgin fibers as long as they are stiff enough or they can produce highly bondable fiber fractions by extensive refining. Use of the concept in real paper mill needs considerations such as increase of refining energy, slower drainage, and added drying burden, but savings of wood fibers, utilization of more recycled fibers, and increase of physical properties may offset the negative concerns. The success of this concept implementation in mills, therefore, depends on the wood fiber market around the mills and the proper decision making for the papermakers about how to apply this concept. apply this concept.

Keywords

References

  1. IPPTA v.21 no.3 Studies on Variations in properties of Indian paperboards Kumar, V.B.;Kumar, N.
  2. Svensk Papperstid v.82 no.3 Optimal blends for stiffness and strength of board and liner De Ruvo, A.
  3. Pap. Puu v.78 no.5 Fiber properties as control variables in papermaking?;Strengthening interfiber bonds and reducing grammage Regulainen, E.;Nieminen, K.
  4. Proc. IUPAC/EUCEPA Symp. Man-made polymers Pmkg Practical and theoretical property requirements of fibrous and filamentary raw materials employed in the manufacture and reinforcement of nonwovens and paper Butterworth, G.A.M.
  5. Svensk Papperstid v.90 no.6 Higher press-section dry-solids content with or without increased paper density Back, E.L.
  6. Eucepa Conf.. 18, Paper No. 11 Influence of the sheet formation method on the properties of multiply paper and board Meineke, A.
  7. Norsk Skogind v.32 no.5 Mechanical pulps in board for implement of bending stiffness Eriksen, J.T.;Gaure, K.;Hauan, S.
  8. J. Pulp and Paper Science v.15 no.1 The effect of beating and low amplitude flexing on pulp flexibility Tamdoo, P.A.;Kerekes, R.J.
  9. Papier v.46 no.10A Stock preparation technology for folding boxboard from waste paper Muhlhauser, M.
  10. Svensk Papperstidining v.81 no.16 Htun, M.;De Ruvo, A.
  11. Papir a Celuloza v.36 no.11 Mancebo, R.;Krokoska, P.
  12. Svensk Papperstidning v.63 no.24 Sandgren, B.;Wahren, D.
  13. Pira International v.2 Products of Papermaking Waterhouse, J.;Omori, K.;Baker, C.(ed.)