|  | 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 Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...B27L; disintegrating peat Fulltext... Hierarchy... Expanded...C10F 7/02; obtaining fibres mechanically for spinning from rags, peat, or the like Fulltext... Hierarchy... Expanded...D01B)

|  | D21B 1/06 |
· · | by dry methods

|  | D21B 1/08 |
· · · | the raw material being waste paper (chemical part Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...D21D 1/00)

|  | D21B 1/14 |
· · · | Disintegrating in mills (in general Fulltext... Hierarchy... Expanded...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