WebCPC CPC COOPERATIVE PATENT CLASSIFICATION

D21D　TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE

D21D 1/00 Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F)

D21D 1/002 ・{Control devices}

D21D 1/004 ・{Methods of beating or refining including disperging or deflaking}

D21D 1/006 ・・{Disc mills}

D21D 1/008 ・・・{Discs}

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

D21D 1/04 ・・Beater rolls or 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 1/303 ・・・{Double disc mills}

D21D 1/306 ・・・{Discs}

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 5/00 Purification of the pulp suspension by mechanical means; Apparatus therefor (centrifuges, cyclones B04)

D21D 5/005 ・{Forming fibrous aggregates}

D21D 5/02 ・Straining or screening the pulp

D21D 5/023 ・・{Stationary screen-drums}

D21D 5/026 ・・・{with rotating cleaning foils}

D21D 5/04 ・・Flat screens

D21D 5/043 ・・・{Vibrating screens}

D21D 5/046 ・・・{Rotary 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

D21D 99/00 Subject matter not provided for in other groups of this subclass