Method for deinking wastepaper

Details Method for deinking wastepaper Method for deinking wastepaper

1994-09-28

1997-07-01

Czaja, Donald E.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 4, 162 56, 162 72, 510174, 510421, 252 60, D21E 502

Patent

active

056434090

ABSTRACT:
A deinking method which comprises adding a specified nonionic surfactant having a specified solubility parameter as an essential component, during in the pulping step (the preceding step) and in any of the subsequent steps (the succeeding step). By use of the deinking surfactant composition and the deinking method of the present invention, an excellent deinking performance, including an elevated whiteness, a decrease in the number of unliberated large ink spots and an improved defoaming property of the flotation reject, can be achieved in deinking waste papers, in particular, waste OA papers and blends containing thereof.

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