Process for the treatment of wastepaper using drum soaker

Details Process for the treatment of wastepaper using drum soaker Process for the treatment of wastepaper using drum soaker

1993-05-21

1994-08-02

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 55, 209 3, 241 24, D21C 502, D21B 132

Patent

active

053342852

ABSTRACT:
The invention concerns a process for the treatment of wastepaper, carried out for the most at a high consistency of at least 13% in the first stages, beginning the dissolution (soaking) and including a coarse sorting stage. The invention is characterized in that in the case of wastepaper containing a share of at least 40% of deinking wastepaper provided with printing inks the three first process stages, namely in this order of soaking, coarse cleaning and the further extensive dissolution of the wastepaper, take place at a considerable reduction of the wastepaper shreds to the usual speck size at a consistency of at least 13%, and the soaking under considerable addition of dissolving chemicals, and that the wastepaper including essentially all heavy contaminations, such as part of wood, glass, plastic or metal contained in the wastepaper, including pieces of metal straps of the wastepaper bales, is fed to the process.

REFERENCES:
patent: 4465591 (1984-08-01), Holz et al.
patent: 4622099 (1986-11-01), Eelman
patent: 4818338 (1989-04-01), Bahr et al.
patent: 4861117 (1989-03-01), Pfalzer et al.

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