Optimization Research on Liquid Absorbency of Light Weight Filter Paper

In order to obtain good liquid absorbency for light weight filter paper, as well as to meet the requirement of assembly thickness for fast detection indicator paper, the effects of beating degree of cotton pulp, softwood pulp and softwood mercerized pulp as well as fiber furnish on the liquid absorbency of filter paper was systematically investigated. Results showed that the filter paper made from softwood mercerized pulp had the strongest liquid absorbency than that of filter paper made from cotton pulp or softwood pulp at the same beating degree, and absorbing height and water absorbency of softwood mercerized pulp were 110 mm and 827g·m-2 respectively. It is difficult for filter paper to meet the requirement of liquid absorbency when it is made from single cotton pulp or softwood pulp and their mixture. Filter paper made from the mixture of cotton pulp and softwood mercerized pulp can meet the requirement of liquid absorbency when the beating degree of pulp is in the range of 18~23°SR. When the proportion of softwood mercerized pulp in the filter paper is 20%, filter paper made from the three pulps can meet both the requirements of liquid absorbency and assembly thickness when the beating degree of pulp is in the range of 20~23°SR.