Improved pulp bleaching apparatus and method

Details Improved pulp bleaching apparatus and method Improved pulp bleaching apparatus and method

D - Textiles, Paper

21

C

D21C 9/02 (2006.01) D21C 9/06 (2006.01) D21C 9/10 (2006.01) D21C 9/147 (2006.01) D21C 9/153 (2006.01)

Patent

CA 2151812

A bleaching process and apparatus for pro- ducing high consistency pulp mats with relatively uniform chemical and temperature distribution in the pulp mat employs a washing press (100) in which the mat is formed in a first chamber (I) while a chemical solution which may first be heated or cooled is added to a second chamber (II). Liquor extraction begins in the first chamber (I) and continues through the second chamber (II) to the nip of the rolls (62). Displacement wash- ing of liquor from the pulp mat begins at the juncture of the first and second chambers and continues until the pulp mat enters the nip. By this process, the adjustment of temperature and chemical content is uniformly accomplished with a minimum loss of energy or materials.

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