Properties of Single-and Two-layered Handsheets Formed with Sw-UKP and OCC

침엽수 미표백 크라프트펄프와 재생고지를 이용한 단층지와 이층지의 물성 연구

  • Park, Yong (Department of Forest Products, College of Agriculture and Life Sciences, Seoul National University) ;
  • Lee, Hak-Lae (Department of Forest Products, College of Agriculture and Life Sciences, Seoul National University)
  • 박용 (서울대학교 농업생명과학대학 임상공학과) ;
  • 이학래 (서울대학교 농업생명과학대학 임상공학과)
  • Published : 1998.06.01


Exploitation of the papermaking technology to reduce the strength loss that accompanies when using recycled papers as raw materials for papermaking is one of the most important issues imposed upon today's paper industry. Multi-layer sheet forming technology has been suggested as a way that provides some answers to this issue. In this study strength properties of single- and two-layer handsheets formed with recycled fiber and unbleached softwood kraft pulp have been examined to quantify the benefits when using two-layer sheet forming technology rather than a conventional single layer sheet forming precess. Single- and two-layer handsheets were made from 50% of OCC and 50% of Sw-UKP and their strength properties were evaluated. Also the strength properties made from Sw-UKP and OCC sheets were determined. A multihead, which can be attached on the top of hand- sheet former, was used to form two-layer sheets. Maximum strength properties could be obtained in the freeness range of 500∼300mL CSF for Sw-UKP Most of the strength properties was reduced by 30∼35% when 50% OCC was blended with UKP. Decrease of strength properties, however, could be reduced by employing a two-layer sheet forming method. Creator strengths could be obtained when UKP was positioned at the top layer of two layered sheets indicating greater UKP fines retention due to the filtration effect of the OCC layer formed prior to UKP layer contributed the strength improvement. Two-layer sheet showed lower Scott internal bond strength than single layer sheet. By incorporating some of UKP fibers into OCC layer this reduction could be reduced.



  1. Tappi J v.76 no.2 Defoe, R.J.
  2. Appita v.40 no.6 Ashburn, M.J.
  3. Tappi v.58 no.9 Koning,J.W.Jr;Godshall,W.D.
  4. Tappi v.57 no.10 Stockmann, V.E.
  5. Tappi v.60 no.10 Erickson, L.D.
  6. Tappi J v.73 no.5 Harwood, J.W.
  7. Apptia v.42 no.1 Page, R.E.;Hergert, R.E
  8. Technology of Paper Recycling Wastepapers use in packagaing papers Mckinney, R.W.J.
  9. Tappi v.57 no.8 Justus, E.J;Gustafson, D.R
  10. Japan Tappi v.62 no.3 Nanko, H
  11. 강원대 석사학위논문 단층지 및 다층지의 내부응력과 물성 남기영
  12. Tappi v.55 no.6 Lyne, M.B.;Jackson,M;Ranger, A.E
  13. Papermakers Conference Proceedings Jones,G.L.;Pet j.P.H.
  14. Tappi v.60 no.1 Hamerstrand,G.E.;Smith, H.E.;Gordon,S.H.;Schulte,M.I.;Russell.C.R.
  15. Tappi v.55 no.1 Hatton,J.V.;Samkova,M