Method of deinking printed wastepapers

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste

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162 7, 162 8, 209 46, 209 47, 209166, 209171, 209211, 210 53, D21C 502

Patent

active

040135055

ABSTRACT:
A method for deinking printed wastepapers in a system of separators through which printed wastepapers, previously impregnated with surface-active agents and alkalis, and repulped in the presence of an organic hydrocarbon compound and high-adsorptive flakes obtained by precipitating solutions of metal soaps of fatty or bituminous acids with solutions of salts of alkaline earths, are forced. The adsorptive flakes containing printing ink are separated from the repulped paper stock by latent vortex action.

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patent: 2005742 (1935-06-01), Hines
patent: 2077059 (1937-04-01), Snyder et al.
patent: 2112562 (1938-03-01), Fisher
patent: 3056713 (1962-10-01), Gartner
patent: 3072521 (1963-01-01), Samuelson et al.
patent: 3501373 (1970-03-01), Illingworth
patent: 3557956 (1971-01-01), Braun et al.
patent: 3635789 (1972-01-01), Green
patent: 3912579 (1975-10-01), Braun
Schwartz, et al., Surface Active Agents & Detergents, vol. II, 1958, pp. 26 & 27.

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