| IPC 7 English version |
| Class D21 |
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| SECTION D – TEXTILES; PAPER |
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| PAPER |
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| D 21 | PAPER-MAKING; PRODUCTION OF CELLULOSE |
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| D 21 B | FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT |
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| D 21 C | PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR |
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| D 21 D | TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE [5] |
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| D 21 F | PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON |
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| D 21 G | CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES (winders or rewinders for finished products, means for adjustment of wrinkles or lateral extensions B65H) |
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| D 21 H | PULP 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] |
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| D 21 J | FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MÂCHÉ (manufacture of articles by dry processes B27N) |
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