Global Patent Index - EP 1375734 A1

EP 1375734 A1 20040102 - Bleached, strong sulfite chemical pulp, a process for the production thereof and products derived therefrom

Title (en)

Bleached, strong sulfite chemical pulp, a process for the production thereof and products derived therefrom

Title (de)

Gebleichter, chemischer Sulfitzellstoff mit guter Festigkeit, Verfahren zu seiner Herstellung und daraus hergestellte Produkte

Title (fr)

Pâte chimique au sulfite blanchie et résistante, procédé de production et produits obtenus

Publication

EP 1375734 A1 20040102 (EN)

Application

EP 02013497 A 20020617

Priority

EP 02013497 A 20020617

Abstract (en)

The present invention relates to a process for preparing a bleached sulfite chemical pulp comprising: delignification of chips of a lignocellulosic material in a sulfite pulping process beyond the defibration point of said material until kappa values of below 50 are reached, and bleaching of the fibrous material thus obtained by means of a chlorine-free bleaching sequence which comprises at least one first bleaching step with a chlorine-free oxidant in the presence of a base. <??>The chemical pulp prepared according to this process and paper or nonwoven made from such are characterized by a high degree of brightness (at least 83%, in particular more than 86%) and high strength.

IPC 1-7

D21C 3/06; D21C 9/10

IPC 8 full level

D21C 9/16 (2006.01); D21C 3/10 (2006.01)

CPC (source: EP)

D21C 9/163 (2013.01); D21C 3/10 (2013.01)

Citation (search report)

  • [X] EP 0402335 A2 19901212 - EKA NOBEL AB [SE]
  • [X] EP 0512590 A1 19921111 - EKA NOBEL AB [SE]
  • [X] US 5916415 A 19990629 - MILLER WILLIAM J [US]
  • [X] US 4450044 A 19840522 - FRITZVOLD BJORN H [NO], et al
  • [X] WO 9411569 A1 19940526 - MO OCH DOMSJOE AB [SE], et al
  • [A] US 6056853 A 20000502 - VINCENT ADAM HAYDEN [AU], et al & IZV. VUZ LESN. ZH. NO. 5/6: 43-47 (1994). [RUSS.;ENGL. SUM.] & J. TAPPIK 26, NO. 2: 44-52 (1994). [KOREAN;ENGL. SUM.] CF. ABIPST 63: ABSTR. 11010. & PULP PAP. INT. 36, NO. 4: 100, 102 (APRIL 1994). [ENGL.] & PULPING CONF. (ATLANTA) PROC. (BOOK 1): 237-252 (TAPPI;NOV. 1-3, 1993). [ENGL.] & PULPING CONF. (BOSTON) PROC. (BOOK 3): 1231-1236 (TAPPI;NOV. 1-5, 1992). [ENGL.]
  • [X] DATABASE PAPERCHEM [online] THE INSTITUTE OF PAPER SCIENCE AND TECHNOLOGY, ATLANTA, GA, US; KORZHITSKAYA, Z. A. ET AL: "Sulfite Pulping of Birch [Betula]", XP002220674, retrieved from DIALOG
  • [X] DATABASE PAPERCHEM [online] THE INSTITUTE OF PAPER SCIENCE AND TECHNOLOGY, ATLANTA, GA, US; LIM, K. P. ET AL: "Neutral Sulfite-Anthraquinone Pulping;Applicability of Neutral Sulfite-Anthraquinone-Ethanol (NSAQAL) Pulping to Different Wood Species and Ozone Bleaching", XP002220675, retrieved from DIALOG
  • [X] DATABASE PAPERCHEM [online] THE INSTITUTE OF PAPER SCIENCE AND TECHNOLOGY, ATLANTA, GA, US; OSBORNE, J.: "Tantanoola [Kimberly-Clark Australia's New BKP Mill];Keeping Up with the Greens", XP002220676, retrieved from DIALOG
  • [X] DATABASE PAPERCHEM [online] THE INSTITUTE OF PAPER SCIENCE AND TECHNOLOGY, ATLANTA, GA, US; KROTSCHECK, A. W. ET AL: "Lenzing [AG., Lenzing, Austria] Way to Closed-Loop Operation: Review and Preview", XP002220677, retrieved from DIALOG
  • [X] DATABASE PAPERCHEM [online] THE INSTITUTE OF PAPER SCIENCE AND TECHNOLOGY, ATLANTA, GA, US; SCHUBERT, H.-L. ET AL: "Chlorine-Free Bleaching of ASAM Pulp and Sulfite Pulp on a Semi-Indusrial Scale: Fiber Deformation During Ozone Bleaching", XP002220678, retrieved from DIALOG

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

DOCDB simple family (publication)

EP 1375734 A1 20040102

DOCDB simple family (application)

EP 02013497 A 20020617