(0)D21B:0/0:
IPC6
SECTION D - TEXTILES; PAPER
D21B
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PAPER

D 21

 PAPER-MAKING; PRODUCTION OF CELLULOSE

D 21 B

 FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT

 

 

 
 

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/ 00 Fibrous raw materials or their mechanical treatment

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/ 02 • Pretreatment of the raw materials by physical or chemical means (removal of bark B 27 L)  

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/ 04 • by dividing raw materials into small particles, e.g. fibres (breaking-up or cutting wood or the like by dry methods B 27 L ; disintegrating peat C 10 F 7/02; obtaining fibres mechanically for spinning from rags, peat, or the like D 01 B)  

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/ 06 • • by dry methods  

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/ 08 • • • the raw material being waste paper (chemical part D 21 C 5/02); the raw material being rags  

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/ 10 • • • • by cutting actions  

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/ 12 • • by wet methods, by the use of steam (beaters D 21 D 1/00)  

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/ 14 • • • Disintegrating in mills (in general B 02 C)  

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/ 16 • • • • in the presence of chemical agents  

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/ 18 • • • • in magazine-type machines  

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/ 20 • • • • • with chain feed  

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/ 22 • • • • • with screw feed  

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/ 24 • • • • • of the pocket type  

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/ 26 • • • • Driving or feeding arrangements  

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/ 28 • • • • Dressers for mill stones, combined with the mill  

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/ 30 • • • Defibrating by other means  

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/ 32 • • • • of waste paper  

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/ 34 • • • • Kneading or mixing; Pulpers  

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/ 36 • • • • Explosive disintegration by sudden pressure reduction  

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/ 38 • Conserving the finely-divided cellulosic material