BLEACHING PRESSURIZED GROUNDWOOD PULPS IN THE GRINDER PIT WITH HYDROSULFITE

被引：0

作者：

TEODORESCU, G

WANG, DLK

FORSBERG, P

HAIKKALA, P

机构：

[1] MORTON INT INC,B-1050 BRUSSELS,BELGIUM

[2] TAMPELLA PAPERTECH OY,SF-33101 TAMPERE,FINLAND

来源：

TAPPI JOURNAL | 1992年 / 75卷 / 06期

关键词：

BLEACHED PULPS; BLEACHING; BRIGHTNESS; DITHIONITES; GROUNDWOOD; GROUNDWOOD PULPING; MULTISTAGE PROCESS; PICEA-ABIES; PILOT PLANTS; PRESSURE GROUNDWOOD; PRESSURIZED GRINDING SEQUENCES;

D O I：

暂无

中图分类号：

TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];

学科分类号：

0805 ; 080502 ; 0822 ;

摘要：

The pressurized grinding process has progressed rapidly and has earned widespread acceptance and application. Pressurized groundwood (PGW) is used in all major grades that contain mechanical pulp; most goes into supercalendered and lightweight-coated grades. Strength properties of super pressurized groundwood (PGW-S) are 10-30% higher than conventional PGW, and PGW is stronger than atmospheric groundwood (GW). However, the higher temperatures and pressures used in PGW-S and PGW pulping have a negative impact on the brightness of the unbleached pulp. This study presents the results of pilot-and mill-scale trials that were carried out to explore the use of sodium hydrosulfite in the grinder pit to increase pulp brightness. The results confirmed that brightness of PGW-S and PGW pulps can be increased to levels comparable with conventional GW while retaining their superior strength properties.

引用

页码：119 / 125

页数：7