| 摘要 |
A method is provided for the manufacture of a cellulosic sheet. The method comprises: a. forming a cellulosic furnish containing from 0.01 to 1.5% by weight cellulosic fiber; b. adding to the furnish: (i) from 0.00005 to 1.25% by weight, based on the dry weight of fiber in the furnish, of a borosilicate having a mole ratio of boron to silicon of from 1:1000 to 100:1, a mole ratio of alkali metal to silicon of from 6:1000 to 1.04:1, a particle size of from 1 to 2000 nm; and a surface area of from 15 to 3000 m<2>/g; and, (ii) from 0.001 to 0.5% by weight, based on the dry weight of fiber in the furnish of a substantially water soluble polymeric flocculant having a molecular weight greater than 500,000 daltons; and then, c.dewatering said furnish to obtain a cellulosic sheet. |
