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The improvements of adding sodium borohyride to the alkali sulfite–anthraquninone (AS–AQ) pulping process on properties of pulp and paper sheets was investigated. These properties were compared to those of the AS–AQ and the ethanol addition to AS–AQ (ASAE) pulping processes. The screened yield increased with alkali sulfite–antraquinone–sodium borohyride (ASAB) pulping process and kappa number decreased with respect to the AS–AQ process. Tensile and burst index of paper sheets improved with the ASAB pulping process, and the tear index for the ASAB pulping process was slightly decreased compared to that of the AS–AQ and ASAE pulping processes. It was determined that whiteness and brightness of papersheets decreased by adding sodium borohyride to the AS–AQ pulping process, whereas the opacity of papersheets did not change clearly compared to AS–AQ and ASAE pulping processes. [ABSTRACT FROM AUTHOR]

The main purposes of filler addition in papermaking are to improve paper properties and reduce cost. The cost reduction is attributed to the low cost of the filler itself and to the energy savings that occur during the papermaking process. In this work, the effects of clay filler addition on the energy savings during the papermaking process, including water drainage, pressing, and drying, were systematically investigated. Experimental results indicated that the addition of filler could dramatically increase the drainage rate and the water removal rates during pressing and drying. With 20% filler addition, the drainage time decreased by 20% compared to the unfilled paper. At a filler content of 23%, the solids content of the handsheets after pressing increased at least 5 absolute points, and the drying rates increased by 20%. All these improvements can offer considerable benefits for paper mills, including enhanced machine speeds and large energy savings. [ABSTRACT FROM AUTHOR]