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IPC 7
Class D21

SECTION D – TEXTILES; PAPER

PAPER

D 21PAPER-MAKING; PRODUCTION OF CELLULOSE

D 21 BFIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT

D 21 CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR

D 21 DTREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE  [5]

D 21 FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON

D 21 GCALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES (winders or rewinders for finished products, means for adjustment of wrinkles or lateral extensions B65H)

D 21 HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C, D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR  [5]

D 21 JFIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MÂCHÉ (manufacture of articles by dry processes B27N)

  
 

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