Fibrous raw materials or their mechanical treatment

DTEXTILES PAPER D21Papermaking D21BFIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT

D21B1/00Fibrous raw materials or their mechanical treatment

D21B1/02Pretreatment of the raw materials by chemical or physical means D21B1/021by chemical means D21B1/023Cleaning wood chips or other raw materials D21B1/025Separating pith from fibrous vegetable materials D21B1/026Separating fibrous materials from waste D21B1/028by dry methods D21B1/04by dividing raw materials into small particles D21B1/06by dry methods D21B1/061using cutting devices D21B1/063using grinding devices D21B1/065of the magazine type D21B1/066the raw material being pulp sheets D21B1/068by cutting actions D21B1/08the raw material being waste paper the raw material being rags D21B1/10by cutting actions D21B1/12by wet methods, by the use of steam D21B1/14Disintegrating in mills D21B1/16in the presence of chemical agents D21B1/18in magazine-type machines D21B1/20with chain feed D21B1/22with screw feed D21B1/24of the pocket type D21B1/26Driving or feeding arrangements D21B1/28Dressers for mill stones, combined with the mill D21B1/30Defibrating by other means D21B1/303using vibrating devices D21B1/306using microwaves D21B1/32of waste paper D21B1/322coated with synthetic materials D21B1/325de-inking devices D21B1/327using flotation devices D21B1/34Kneading or mixing Pulpers D21B1/342Mixing apparatus D21B1/345Pulpers D21B1/347Rotor assemblies D21B1/36Explosive disintegration by sudden pressure reduction D21B1/38Conserving the finely-divided cellulosic material