|  | D |
SECTION D — TEXTILES; PAPER

PAPER

|  | D21 |
PAPER-MAKING; PRODUCTION OF CELLULOSE

|  | D21B |
FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT

|  | D21C |
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR

|  | D21C |
Note(s) Processes using enzymes or micro-organisms in order to: liberate, separate or purify a pre-existing compound or composition, or to treat textiles or clean solid surfaces of materials are further classified in subclass Fulltext... Hierarchy... Expanded...C12S. [5]

|  | D21C |
Subclass index
PRODUCTION OF CELLULOSE |
Pretreatment of raw material | 1/00
Pulping | 3/00
Other processes | 5/00
Digesters | 7/00
AFTER-TREATMENT | 9/00
REGENERATION OF PULP LIQUORS | 11/00

|  | D21D |
TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE [5]

|  | D21F |
PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON

|  | D21F |
Subclass index
MAKING CONTINUOUS WEBS |
Complete machines | 9/00
Details |
wet end, transfer to press section, press section, dryer section | 1/00, 2/00, 3/00, 5/00
other details | 7/00
Processes | 11/00
MAKING DISCONTINUOUS SHEETS | 13/00

|  | D21G |
CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES (winders or rewinders for finished products, means for adjustment of wrinkles or lateral extensions Fulltext... Hierarchy... Expanded...B65H)

|  | D21H |
PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES Fulltext... Hierarchy... Expanded...D21C, Fulltext... Hierarchy... Expanded...D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS Fulltext... Hierarchy... Expanded...B31 OR SUBCLASS Fulltext... Hierarchy... Expanded...D21G; PAPER NOT OTHERWISE PROVIDED FOR [5]

|  | D21H |
Note(s) This subclass covers also pulp compositions for the preparation of fibreboard or other fibrous articles by wet processes. [5] In this subclass, the following terms are used with the meaning indicated: "pulp" means a dispersion comprising paper-making fibres and optional additives, which is to be processed, and covers the term "stock"; it also means dry paper-making fibres which are to be made into paper by either wet or dry processes; "paper" means paper, cardboard or wet-laid non-woven fabrics. [5] In groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...D21H 11/00-D21H 15/00, in the absence of an indication to the contrary, classification is made in the last appropriate place. [5] Processes using enzymes or micro-organisms in order to: liberate, separate or purify a pre-existing compound or composition, or to treat textiles or clean solid surfaces of materials are further classified in subclass Fulltext... Hierarchy... Expanded...C12S. [5]

|  | D21H |
Subclass index
PULP OR PAPER |
comprising cellulose, lignocellulose or non-cellulose fibres or web-forming material | 11/00, 13/00
comprising fibres or web-forming material not characterised by their chemical constitution | 15/00
Processes or apparatus for adding material | 23/00
NON-FIBROUS MATERIAL ADDED TO THE PULP, PAPER-IMPREGNATING MATERIAL | 17/00, 21/00
COATED PAPER; COATING MATERIAL | 19/00
OTHER AFTER-TREATMENTS OF PAPER | 25/00
SPECIAL PAPER | 27/00

|  | D21J |
FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE (manufacture of articles by dry processes Fulltext... Hierarchy... Expanded...B27N)