Patent · US Expired

Process for removing printing inks from printed wastepaper or from paper circuit waters

US5512134A · kind A · utility

3Cited by

3References

18Claims

0Family size

Assignee

Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

Peter Daute · Beverstedt, DE
Berthold Schreck · Goldkronach, DE
Klaus Hornfeck · Mettmann, DE

Key dates

Filing date	Jul 29, 1994
Grant date	Apr 30, 1996
Priority date	—
Expiry date	Jul 29, 2014

Classification

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

Abstract

A process for removing printing inks from printed wastepaper in the presence of a deinking chemical is provided. In this process printed wastepaper is disintegrated to form a paper stock suspension and the detached printing ink particles are removed in known manner by flotation or washing in another stage. In this process, alkoxylates of blown oils are used as the deinking chemical. The deinking chemical is added during disintegration and/or before the flotation or washing step. Preferably, the printed wastepaper is disintegrated in the presence of 0.02 to 2% by weight and preferably 0.1 to 0.8% by weight, based on air-dry paper stock, of alkoxylates of blown oils. This deinking chemical also removed printing inks from paper circuit waters.

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