D
SECTION D — TEXTILES; PAPERS
  
PAPER
 D21
PAPER-MAKING; PRODUCTION OF CELLULOSE
 D21B
FIBROUS RAW MATERIALS AND THEIR MECHANICAL TREATMENT
 D21B 1/00
Fibrous raw materials and their mechanical treatment
 D21B 1/02
·  Pre-treatment of the raw materials by physical or chemical means (removal of bark B27L)
 D21B 1/04
·  by dividing raw materials into small particles, e.g. fibres (breaking-up or cutting wood or the like by dry methods B27L; disintegrating peat C10F 7/02; obtaining fibres mechanically for spinning from rags, peat, or the like D01B)
 D21B 1/06
·  ·  by dry methods
 D21B 1/08
·  ·  ·  the raw material being waste paper (chemical part D21C 5/02); the raw material being rags
 D21B 1/10
·  ·  ·  ·  by cutting actions
 D21B 1/12
·  ·  by wet methods, by the use of steam (beaters D21D 1/00)
 D21B 1/14
·  ·  ·  Disintegrating in mills (in general B02C)
 D21B 1/16
·  ·  ·  ·  in the presence of chemical agents
 D21B 1/18
·  ·  ·  ·  in magazine-type machines
 D21B 1/20
·  ·  ·  ·  ·  with chain feed
 D21B 1/22
·  ·  ·  ·  ·  with screw feed
 D21B 1/24
·  ·  ·  ·  ·  of the pocket type
 D21B 1/26
·  ·  ·  ·  Driving or feeding arrangements
 D21B 1/28
·  ·  ·  ·  Dressers for mill stones, combined with the mill
 D21B 1/30
·  ·  ·  Defibrating by other means
 D21B 1/32
·  ·  ·  ·  of waste paper
 D21B 1/34
·  ·  ·  ·  Kneading or mixing; Pulpers
 D21B 1/36
·  ·  ·  ·  Explosive disintegration by sudden pressure reduction
 D21B 1/38
·  Conserving the finely-divided cellulosic material