Patents Assigned to Stora Feldmuhle Aktiengesellschaft
  • Patent number: 5338405
    Abstract: In a process for manufacturing chemo-mechanical and/or chemothermal-mechanical wood pulps, raw materials containing lignocellulose, such as wood shavings, wood chips, pre-ground wood or sawdust, are first impregnated with an aqueous alcoholic SO.sub.2 solution and then heated to a temperature between and C. for a period of 1 to 300 minutes. The wood shavings are then ground to the desired degree of fineness in a defibrinating device. The process makes it possible to achieve up to 50% reduction in grinding energy in comparison with known chemothermal-mechanical processes.
    Type: Grant
    Filed: May 18, 1992
    Date of Patent: August 16, 1994
    Assignee: Stora Feldmuhle Aktiengesellschaft
    Inventors: Rudolf Patt, Georg Rachor
  • Patent number: 5334449
    Abstract: In the abstract No. 75-35061W of the WPI, Week 7521, Derwent P. L. London (citing JP-A-118906/1974) there is disclosed a paper with a cover coat applied by the cast coating process, for whose preparation first a prime coat is applied whose pigment composition consists of 30 wt. % of kaolin and 60 wt. % of a polystyrene pigment, and whose binding agent composition includes 10 weight-parts casein and 16 weight-parts of a carboxylated butadiene-styrene latex. After this prime coat has dried a mixture of 80 weight-parts of kaolin, 20 weight-parts of calcium carbonate, 10 weight-parts of casein and 8 weight-parts of a butadiene-styrene latex is applied and the applied composition is pressed at a temperature of C. against a chrome-lacquered surface.
    Type: Grant
    Filed: February 25, 1993
    Date of Patent: August 2, 1994
    Assignee: Stora Feldmuhle Aktiengesellschaft
    Inventors: Werner Bergmann, Paul H. Dahling
  • Patent number: 5314753
    Abstract: A matte printing paper, excepting bank note and security document paper, especially for offset or intaglio printing, is coated with a composition containing calcium carbonate as a coating pigment, a binding agent for absorption of printing ink and 10 to 65% by weight, based on its total solids content, of ungelatinized starch granules, except rice starch granules.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: May 24, 1994
    Assignee: Stora Feldmuhle Aktiengesellschaft
    Inventor: Werner Bergmann