Patent · US Expired

Process and apparatus for preparing waste paper for reuse

US4360402A · kind A · utility

20Cited by

1References

6Claims

0Family size

Assignee

J.M. Voith GmbH · DE

Inventors

Herbert Ortner · Heidenheim, DE
Lother Pfalzer · Heidenheim, DE
Siegbert Fischer · Heidenheim, DE

Key dates

Filing date	Mar 27, 1979
Grant date	Nov 23, 1982
Priority date	—
Expiry date	Mar 27, 1999

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S210/928
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A process and apparatus for preparing waste paper for reuse in a paper machine. Waste paper, water and de-inking chemicals are introduced to coarse pulping apparatus, and the coarsely pulped stock suspension is then thickened by filtration and treated in a reaction tower. The pulp is then thinned and passed through flotation apparatus to remove separated impurities, particularly printing inks. Water removed from the pulp in the thickening operation is passed through second flotation apparatus with the clean water therefrom being reintroduced to the apparatus.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.