|  | D |
SECTION D — TEXTILES; PAPERS

PAPER

|  | D21 |
PAPER-MAKING; PRODUCTION OF CELLULOSE

|  | D21D |
TREATMENT OF THE DIGESTED MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE; PROCESSES FOR ADDING SUBSTANCES TO THE FORMED WEB ON THE PAPER-MAKING MACHINE

|  | D21D 1/00 |
Methods of beating or refining; Beaters of the Hollander type (knotter screens Fulltext... Hierarchy... Expanded...D21F)

|  | D21D 1/02 |
· | Methods of beating; Beaters of the Hollander type

|  | D21D 1/04 |
· · | Beater rolls and bars

|  | D21D 1/06 |
· · | Bed plates

|  | D21D 1/08 |
· · | Beaters with means for driving the pulp quickly

|  | D21D 1/10 |
· · | Beaters with means for regulating the pressure between the beater roll and the bed plate

|  | D21D 1/12 |
· · | Beaters with means for continuous pulp discharge

|  | D21D 1/14 |
· · | Beaters with one beater roll and with vertical stuff circulation canal

|  | D21D 1/16 |
· · | Beaters with means for returning the pulp over the head of the beater roll

|  | D21D 1/18 |
· · | Beaters with two or more beater rolls

|  | D21D 1/20 |
· | Methods of refining

|  | D21D 1/22 |
· · | Jordans

|  | D21D 1/24 |
· · · | Jordan rolls

|  | D21D 1/26 |
· · · | Jordan bed plates

|  | D21D 1/28 |
· · | Ball or rod mills

|  | D21D 1/30 |
· · | Disc mills

|  | D21D 1/32 |
· · | Hammer mills

|  | D21D 1/34 |
· · | Other mills or refiners

|  | D21D 1/36 |
· · · | with vertical shaft

|  | D21D 1/38 |
· · · | with horizontal shaft

|  | D21D 1/40 |
· · | Washing the fibres

|  | D21D 3/00 |
Processes for adding substances to the wet pulp or to the formed web on the paper-making machine, e.g. sizing, impregnating (bleaching cellulose Fulltext... Hierarchy... Expanded...D21C 9/10; paper or cardboard produced by adding substances to the pulp or to the formed web on the paper-making machines Fulltext... Hierarchy... Expanded...D21H 3/00)

|  | D21D 5/00 |
Purification of the pulp suspension by mechanical means; Apparatus therefor (centrifuges, cyclones Fulltext... Hierarchy... Expanded...B04)

|  | D21D 5/02 |
· | Straining or screening the pulp

|  | D21D 5/04 |
· · | Flat screens

|  | D21D 5/06 |
· · | Rotary screen-drums

|  | D21D 5/08 |
· · · | combined with a rocking movement

|  | D21D 5/10 |
· · · · | of the tank

|  | D21D 5/12 |
· · · · | of the screen

|  | D21D 5/14 |
· · · · | of the tank and the screen

|  | D21D 5/16 |
· · | Cylinders and plates for screens

|  | D21D 5/18 |
· | with the aid of centrifugal force

|  | D21D 5/20 |
· · | in apparatus with a horizontal axis

|  | D21D 5/22 |
· · | in apparatus with a vertical axis

|  | D21D 5/24 |
· · | in cyclones

|  | D21D 5/26 |
· | De-aeration of paper stock

|  | D21D 5/28 |
· | Tanks for storing or agitating pulp