Process for the manufacture of paper pulp from waste paper

Details Process for the manufacture of paper pulp from waste paper Process for the manufacture of paper pulp from waste paper

1974-03-13

1976-05-18

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 56, 162 59, 162380, D21B 132, D21B 134

Patent

active

039575721

ABSTRACT:
A process for the manufacture of paper pulp from waste paper in which the waste paper is comminuted in water in a pulper, pre-cleaned for removal of coarse foreign contaminants, dewatered, kneaded at high concentration, diluted, after-cleaned for removal of finer or coherent soft foreign contaminants and adjusted to a concentration suitable for paper-making, the water respectively used for dilution and obtained during dewatering being circulated in two separate circuits upstream and downstream respectively of the kneading apparatus.

REFERENCES:
patent: 2062442 (1936-12-01), Campbell
patent: 2887430 (1959-05-01), Wallen
patent: 3057769 (1962-10-01), Sandberg
patent: 3549092 (1970-12-01), Baxter, Jr.
patent: 3849246 (1974-11-01), Raymond et al.

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