| Abstract:Manufacture of low density printing paper using low brightness wheat straw chemical pulp mixed with CTMP as fiber saw material and synthetic calcium silicate as fiber was studied. The results showed that, with the proportion of wheat straw chemical pulp increasing gradually, the retention rate of filler, the opacity, tensile strength and water resistance of the handsheet showed an increasing tendency, the bulk and brightness of handsheet decreased. Under similar smoothness condition compared with conventional low density printing paper made of mixed wood pulp and PCC, the low density printing paper made of low brightness wheat straw chemical pulp and synthetic calcium silicate and prepared by using dynamic sheet former had better quality, the bulk increased from 1.74 cm3/g to 1.88 cm3/g, the tensile strength increased from 34.2 N·m/g to 44.5 N·m/g, the Cobb60 decreased from 47.0 g/m2 to 35.9 g/m2, the opacity kept stable, and the brightness decreased from 80.3% to 71.7%． |
