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:

  1. liberate, separate or purify a pre-existing compound or composition, or to
  2. treat textiles or clean solid surfaces of materials
are further classified in subclass 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 B65H)

 D21H
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]
 D21H

Note(s)

  1. This subclass covers also pulp compositions for the preparation of fibreboard or other fibrous articles by wet processes. [5]
  2. 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; [5]
    • "paper" means paper, cardboard or wet-laid non-woven fabrics.
  3. If a pulp composition or a paper, or a constituent thereof, is characterised by more than one feature provided for in this subclass, for example, by both the fibrous material and a coating or by both a colorant and a water-repelling agent, classification is made in all places providing for these features.  [8]
  4. Processes using enzymes or micro-organisms in order to:
    1. liberate, separate or purify a pre-existing compound or composition, or to
    2. treat textiles or clean solid surfaces of materials
    are further classified in subclass 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-MÂCHÉ (manufacture of articles by dry processes B27N)