Paper making and fiber liberation – Apparatus – Digester
Patent
1984-03-16
1985-12-03
Smith, William F.
Paper making and fiber liberation
Apparatus
Digester
162246, 162250, 162251, D21C 700
Patent
active
045564523
ABSTRACT:
A process and apparatus for producing pulp from impregnated cellulose-containing starting materials such as wood, straw, grass, waste materials etc. in a compacting apparatus comprising a shell (1) and two mutually opposite pistons (4, 4') contained in said shell. The material to be compacted is disposed between said pistons and constitutes a resistive electrical load. The pistons are movable relative to each other and the shell is movable relative to the pistons. The impregnated starting materials are digested at a relatively low hydromodulus of 0.5 to 2 with a direct action of heat on the impregnated starting materials in the compacting apparatus at a digesting temperature of 160.degree. to 300.degree. C. The digesting times are short and depend on the digesting temperature.
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Kleinert, T. N. Tappi vol. 51, No. 10, 10/68, pp. 467-470.
Kleinert, T. N. Pulp Pap Mag Can 7/64, T-27-5-T-783.
Article "Neue Technologische Tendenzen fur die Europaische Papierindustrie", in Das Papier, 1974, No. 10A, pp. V125 to V129, by H. Bouchayer, with an English translation of the revelant part on p. V128, marked with red.
Rabitsch Hermann
Raggam Augustin
Simmering-Graz-Pauker Aktiengesellschaft
Smith William F.
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