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Title:
METHOD FOR PRODUCING DEINKED PULP HAVING HIGH DEGREE OF WHITENESS
Document Type and Number:
Japanese Patent JP2007231470
Kind Code:
A
Abstract:

To provide a method for bleaching, which is capable of producing a deinked waste paper pulp having a high degree of whiteness and a bleaching chemical basic unit lower than that of a conventional method by improving the bleaching effect of the deinked pulp with an alkaline hydrogen peroxide.

This pulp-forming process constituted of apparatus for producing deinked pulp having the high degree of whiteness, which consists of the combination of a disintegrating process of disintegrating printed waste paper, a screening process of removing dusts, a floatation process of deinking treatment, a bleaching process for bleaching and soaking treatments, a dispersing process of giving a mechanical shearing force, and a cleaning process of cleaning treatment, wherein the bleaching process consists of the continuous processes of two stages having a first bleaching process of alkaline hydrogen peroxide bleaching at 50 to 80°C and a second bleaching process of bleaching performed by elevating temperature up to 90 to 120°C.

COPYRIGHT: (C)2007,JPO&INPIT


More Like This:
JPH06207392PROCESS FOR BLEACHING OF LIGNOCELLULOSE-CONTAINING PULP
WO/2006/119392LIGNO CELLULOSIC MATERIALS AND THE PRODUCTS MADE THEREFROM
WO/1996/002699A METHOD AND AN ARRANGEMENT RELATING TO BLEACHING WITH PRESSURIZED PEROXIDE
Inventors:
KAGAWA HITOSHI
MIURA TAKAHIRO
ISHIMURA TAIJI
WATANABE ATSUSHI
ANDO YASUSHI
Application Number:
JP2006056157A
Publication Date:
September 13, 2007
Filing Date:
March 02, 2006
Export Citation:
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Assignee:
OJI PAPER CO
International Classes:
D21C9/16; D21C5/02
Domestic Patent References:
JP2005240188A2005-09-08
JP2005281914A2005-10-13
JPH11315487A1999-11-16
JP2005082948A2005-03-31
JP2002138380A2002-05-14
JP2004068175A2004-03-04
JP2005248386A2005-09-15
JP2007177379A2007-07-12
JP2005240188A2005-09-08
JP2005281914A2005-10-13
JPH11315487A1999-11-16
JP2005082948A2005-03-31
JP2002138380A2002-05-14
JP2004068175A2004-03-04
JP2005248386A2005-09-15
JP2007177379A2007-07-12



 
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