Title:
【発明の名称】メカニカルおよびケミサーモメカニカルパルプの漂白方法
Document Type and Number:
Japanese Patent JP2003522846
Kind Code:
A
Abstract:
The present invention relates to a method for bleaching mechanical and chemithermomechanical pulp including that an advancing pulp suspension obtained after that the fibres are laid free is prebleached by adding reductive bleaching agent to the pulp suspension in a location just after the fibres are laid free and that the bleaching is carried out under given conditions in the form of high temperature and minimized oxygen access in respect of said adding location and immediately downstream of said location, characterized in, that the in the described manner prebleached pulp is subjected to at least one further bleaching treatment including that the pulp is bleached with an oxidizing bleaching agent, preferably peroxide bleaching agent, reinforced with borohydride.
Inventors:
Tsang, Ising
D, Yong Hao
One, Shu Yu
D, Yong Hao
One, Shu Yu
Application Number:
JP2001558530A
Publication Date:
July 29, 2003
Filing Date:
February 08, 2001
Export Citation:
Assignee:
Holmen, Actie Borrag
International Classes:
D21C9/10; D21C9/16; D21H11/08; (IPC1-7): D21C9/16; D21C9/10; D21H11/08
Attorney, Agent or Firm:
Akaoka Mio