Patents Assigned to Vyzkumny ustav papieru a celulosy
  • Method of deinking printed wastepapers
    Patent number: 4013505
    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.
    Type: Grant
    Filed: May 30, 1975
    Date of Patent: March 22, 1977
    Assignee: Vyzkumny ustav papieru a celulosy
    Inventors: Cestmir Balcar, Antonin Kostka, Jaroslav Havranek, Marcel Lalak