Processing wastepaper containing waxes, hot melts and adhesives

Details Processing wastepaper containing waxes, hot melts and adhesives Processing wastepaper containing waxes, hot melts and adhesives

1997-01-24

1998-01-13

Czaja, Donald E.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 55, 209168, D21C 502

Patent

active

057074895

ABSTRACT:
A method of processing recycled paper which contains such a high amount of wax, hot melts or stickies that they would be expected to cause a stoppage of the paper-manufacturing machine. The paper to be recycled is pulped in a pulper and passed on to respective subsequent stages which include a despecker, grader and hydrocyclone. Pulping takes place at a temperature of at least 60.degree. C., and at the same time subjects the paper to a high shear action. The processing line includes a pulp-thickening stage, preferably after the processing stages mentioned, in order to separate off a very high proportion of the wax, hot melts and stickies finely dispersed in the pulper.

REFERENCES:
patent: 2959513 (1960-11-01), Savage
patent: 3849246 (1974-11-01), Raymond et al.
patent: 4780179 (1988-10-01), Clement
patent: 5358605 (1994-10-01), Dorflinger et al.

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