Introduction Mechanical pulping operations consume large quantities of electrical energy to produce high yield but relatively weak pulps with useful optical properties (Kano et al. 1982; Kurdin 1979; Leask and Kocurek 1987; Pulp and Paper 1989;West 1979). Such pulps are desirable for printing papers because of their optical properties. Groundwood process produces the weakest mechanical pulp with the best optical properties, and is the least energy intensive. Refiner mechanical pulping processes produce stronger pulps with reduced optical properties, but require more energy. Adding steam pressure to the refining operation (thermomechanical pulp) (TMP), and chemicals together with steam pressurization (chemithermomechanical pulp) (CTMP), retains more of the basic fiber length and improves paper strength (Beath and Mihelich 1977; Higgins et al. 1978; Kurdin 1979; Mokvist et al. 1985; Wegner 1982,1987). However, the increased strength properties are offset by reduced optical properties, and the TMP and CTMP processes may actually increase energy consumption (Kurdin 1979; Beath and Mihelich 1977). The CTMP process also generates a troublesome dilute waste liquor stream. Mechanical pulp production is increasing (Atack 1985; Jackson 1985), although growth has reThis article was written and prepared by Government employees on official time, and it is therefore in the public
Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood – de Gruyter
Published: Jan 1, 1993
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