D21H

PULP COMPOSITIONS

PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D

IMPREGNATING OR COATING OF PAPER

TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

PAPER NOT OTHERWISE PROVIDED FOR

This subclass covers also pulp compositions for the preparation of fibreboard or other fibrous articles by wet processes.

In this subclass, the following terms are used with the meaning indicated:

"pulp" means a dispersion, e.g. an aqueous suspension, 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.

In groups D21H11/00 - D21H15/00, in the absence of an indication to the contrary, classification is made in the last appropriate place.

The following IPC group is not in the CPC scheme. The subject matter for this IPC group is classified in the following CPC group:

D21H27/12

covered by D21H27/00, H01B3/52

In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.

D21H1/00

IPC4 groups

D21H1/00

Paper; Cardboard fibreboard D21J

Layered products classified in this group are also classified in subclass B32B

D21H1/02

Multi-ply material finished plies

D21H1/04

by using an adhesive

D21H1/06

Apparatus

D21H1/08

with incorporated laminae of threads or fabric

D21H3/00

Paper or cardboard prepared by adding substances to the pulp or to the formed web on the paper-making machine and by applying substances to finished paper or cardboard (on the paper-making machine), also when the intention is to impregnate at least a part of the paper body

A compound is always classified in the last appropriate place.

D21H3/82

by adding insoluble coloured substances, e.g. powders, fibres, pieces of metal, for obtaining different colours in the paper fancy papers; substances characterised by their physical appearance, e.g. form, rather than by their chemical constitution

D21H3/825

substances having a characteristic form, e.g. powders, disintegrated resin foams

D21H5/00

Special paper or cardboard not otherwise provided for duplicating or recording paper B41M

D21H5/0002

Flame-resistant papers; (complex) compositions rendering paper fire-resistant

D21H5/0005

Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating applying liquids to surfaces in general B05; treating textile materials by liquids, gases or vapours D06B; impregnated or coated fibreboard D21J1/08; apparatus for making patterned paper D21H5/06; printing machines B41F

Equipment related to specific chemical treatment, see relevant sub-groups for this treatment; e.g. parchmentising or vulcanising D21H5/08, treatment with viscose D21H17/25

D21H5/0007

Pretreatment of paper to which liquids or other fluent materials are to be applied

D21H5/001

by treating paper or board in discontinuous form, e.g. separate sheets, blanks, paper rolls, or the like

D21H5/0012

by bringing paper into contact with an excess of fluids, the paper carrying away only a part of the fluid material, e.g. by passing through liquids, gases or vapours

D21H5/0015

only one side of the paper being in contact with the treating medium, e.g. paper carried by support

D21H5/0017

Trailing blade coaters, e.g. blade engaging paper and forming bottom wall of reservoir

D21H5/002

the paper being at least partly surrounded by treating medium on both sides

D21H5/0022

treating medium being a gas or vapour

D21H5/0025

by contact with a device carrying the treating material C12 take precedence

D21H5/0027

by a rubbing device, e.g. with brushes or pads

D21H5/003

with a roller

D21H5/0032

Details thereof, e.g. surface characteristics, peripheral speed

D21H5/0035

the coating material on the applicator roller being subjected to a particular treatment before applying to paper

D21H5/0037

Reverse roll coating, e.g. applicator surface moving in direction opposite to that of paper

D21H5/004

the treating material being non-fluent at the moment of transfer, e.g. in form of preformed, at least partially hardened, coating

D21H5/0042

by pouring or allowing to flow in a continuous stream onto the surface, the entire stream being carried away by the paper

D21H5/0045

Falling curtain method

D21H5/0047

by spraying or projecting D21H5/0022 takes precedence

D21H5/005

involving several different techniques of application treatments in which the characteristics of a single treatment are of interest only, or in which all treatments have characteristics provided for in a single sub-group, see the relevant sub-groups for the single treatment; several superposed coatings D21H19/82; apparatus for making multi-ply material D21H1/06

D21H5/0052

Plural serial stages

D21H5/0055

Plural parallel stages

D21H5/0057

Apparatus permitting switching from one technique to another

D21H5/006

Controlling or regulating controlling or regulating in general G05

D21H5/0062

Regulating the amount or the distribution, e.g. smoothing, of essentially fluent material already applied to the paper; Recirculating excess coating material applied to paper after-treatment D21H25/00 - D21H25/18

D21H5/0065

with blades trailing blade D21H5/0017

D21H5/0067

with an essentially cylindrical body, e.g. roll or rod

D21H5/007

with a blast of gas or vapour, e.g. air knife

D21H5/0072

Anti-slip papers

D21H5/0075

Anti-friction, anti-abrasive or release paper processes for obtaining an anti-friction or anti-adhesive surface B05D5/08; adhesive materials on paper characterised by the release coating composition C09J7/21

D21H5/0077

Transparent papers, e.g. paper treated with transparent-rendering compositions or glassine paper prepares from well-hydrated stock paper with watermarks B41M3/10; watermaking devices D21F1/44

D21H5/008

characterised by the use of special fibrous materials as well as special compounds use of special fibrous materials D21H5/12; adding substances to the pulp or to the formed web D21H3/00

D21H5/0082

Wall papers printed wallpapers B41M3/18; pregummed wall paper C09J7/21

D21H5/0085

Paper for surface-protection and decorative purposes, e.g. pressure laminates wall paper D21H5/0082; multi-ply material D21H1/02

D21H5/0087

Aspect concerning the core layer(s)

D21H5/009

Aspect concerning the anchor layer(s)

D21H5/0092

Post-treated paper after-treatment following application of substances to finished paper D21H25/00 - D21H25/18, D21H5/0062; after-treatment of printed works B41M7/00; working paper B31F; paper from fibres which can be modified D21H5/1272

D21H5/0095

with means capable of destructing or weakening the paper structure, e.g. cellulose decomposing agents working-up waste paper D21C5/02

D21H5/0097

with means restoring or reinforcing the paper-structure preserving paintings B44D7/00; multi-ply material with incorporated laminae of threads or fabric D21H1/08

D21H5/02

Patterned paper

D21H5/025

Webs provided with apertures

D21H5/04

marbled

D21H5/06

Apparatus

D21H5/08

Vegetable parchment

D21H5/12

characterised by the use of special fibrous materials felts or other non-woven fabrics D04

D21H5/1209

of protein fibres

D21H5/1218

of crimped or crimpable fibres

D21H5/1227

of polysaccharide fibres other than cellulosic, e.g. alginate fibres

D21H5/1236

of fibres which have been treated to render them suitable for sheet formation, e.g. fibrillatable fibres

D21H5/1245

of long or continuous filaments

D21H5/1254

of fibres which have been treated to improve their dispersion in the paper-making furnish

D21H5/1263

of fibres which have been swollen

D21H5/1272

of fibres which can be physically or chemically modified during or after web formation after treatment of coated or impregnated papers D21H25/00 - D21H25/18

D21H5/1281

by chemical treatment

D21H5/129

by thermal treatment

D21H5/14

of cellulose fibres only

D21H5/141

of fibrous cellulose derivatives

D21H5/143

grafted or encapsulated cellulose

D21H5/145

cellulose esters

D21H5/146

cellulose acetate

D21H5/148

viscose

D21H5/16

Tobacco or cigarette paper

D21H5/18

of inorganic fibres with or without cellulose fibres

D21H5/183

of asbestos fibres

D21H5/186

of mica fibres or flakes

D21H5/20

of organic non-cellulosic fibres too short for spinning, with or without cellulose fibres

D21H5/202

polyolefins

D21H5/205

acrylic fibres

D21H5/207

polyester fibres

D21H5/22

Fungicidal, bactericidal, insecticidal, disinfecting, antiseptic, or corrosion-inhibiting paper antistatic, antioxygenic paper toilet paper A47K10/16

D21H5/24

having enhanced flexibility or extensibility produced by mechanical treatment of the unfinished paper crêping paper B31F1/12; making patterned paper D21F11/006, apertured paper D21F11/008

D21H5/245

obtained by compressing the (moist) paper in directions lying in, and optionally perpendicular to, the paper plane, e.g. plain-surfaced Clupak papers

D21H5/26

Special paper or cardboard manufactured by dry method; Apparatus or processes for forming webs by dry method from mainly short-fibre or particle material, e.g. paper pulp making board from wood, e.g. lignocellulosic, particles or fibres B27N1/00 and subgroups; making non-woven fabrics from textile fibres D04H1/72; machines for forming diapers A61F13/15585; lap-forming devices in preliminary treatment of fibres, e.g. for spinning D01G25/00

D21H5/2607

Pretreatment and individualisation of the fibres, formation of the mixture fibres-gas and laying the fibres on a forming surface manufacture of a pulp sheet or dewatered pulp D21C9/185

D21H5/2614

Detachment of the fibres from their compressed state, e.g. by disintegration of a pulpboard mechanical treatment of fibrous raw materials by dry methods D21B1/06

D21H5/2621

Distribution of the fibres in the gas stream and on the forming surface

D21H5/2628

Formation of a product from several constituents, e.g. blends of various types of fibres, fillers and/or binders or formation from various sources and/or streams or fibres mixing non-fibrous materials with fibres as a preliminary treatment of fibres, e.g. for spinning D01G13/00

D21H5/2635

forming a final homogeneous product

D21H5/2642

forming a final non-homogeneous product

D21H5/265

Treatment of the formed web

D21H5/2657

Consolidation

D21H5/2664

Addition of a binder, e.g. synthetic resins or water

D21H5/2671

Compression of the web, optionally with the use of a binder

D21H5/2678

Manufacture of layered products (assembly of superposed sheets), comprising the consolidation of such a structure formation of a web by dry method directly on to other webs formed solely by dry method D21H5/2628 and subgroups

D21H5/2685

by dry method on to a web or on or between several preformed webs, at least one of which has been formed by another method, e.g. by wet method

D21H5/2692

Assembly of several preformed webs, at least one of which has been formed by dry method

D21H11/00

Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only

D21H11/02

Chemical or chemomechanical

or chemothermomechanical

pulp

D21H11/04

Kraft or sulfate pulp

D21H11/06

Sulfite or bisulfite pulp

D21H11/08

Mechanical or thermomechanical pulp

D21H11/10

Mixtures of chemical and mechanical pulp

D21H11/12

Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse

D21H11/14

Secondary fibres working-up waste paper D21C5/02

D21H11/16

modified by a particular after-treatment

D21H11/18

Highly hydrated, swollen or fibrillatable fibres

D21H11/20

Chemically or biochemically modified fibres

D21H11/22

cationised

D21H13/00

Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material chemical features in the manufacture of artificial fibres D01F

D21H13/02

Synthetic cellulose fibres

D21H13/04

Cellulose ethers

D21H13/06

Cellulose esters

D21H13/08

from regenerated cellulose

D21H13/10

Organic non-cellulose fibres

D21H13/12

from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds

D21H13/14

Polyalkenes, e.g. polystyrene

polyethylene

D21H13/16

Polyalkenylalcohols

Polyalkenylethers

Polyalkenylesters

D21H13/18

Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylonitriles

D21H13/20

from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds

D21H13/22

Condensation polymers of aldehydes or ketones

D21H13/24

Polyesters

D21H13/26

Polyamides

Polyimides

D21H13/28

from natural polymers

D21H13/30

Non-cellulose polysaccharides

D21H13/32

Alginate fibres

D21H13/34

Protein fibres

D21H13/36

Inorganic fibres or flakes

D21H13/38

siliceous

D21H13/40

vitreous, e.g. mineral wool, glass fibres

D21H13/42

Asbestos

D21H13/44

Flakes, e.g. mica, vermiculite

D21H13/46

Non-siliceous fibres, e.g. from metal oxides

D21H13/48

Metal or metallised fibres

D21H13/50

Carbon fibres

D21H15/00

Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution

D21H15/02

characterised by configuration

D21H15/04

crimped, kinked, curled or twisted fibres

D21H15/06

Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres

Filaments

D21H15/08

Flakes D21H13/44 takes precedence

D21H15/10

Composite fibres

D21H15/12

partly organic, partly inorganic

D21H17/00

Non-fibrous material added to the pulp, characterised by its constitution

Paper-impregnating material characterised by its constitution

In this group, in the absence of an indication to the contrary, a material is classified in the last appropriate place.

D21H17/005

Microorganisms or enzymes

D21H17/01

Waste products, e.g. sludge

D21H17/02

Material of vegetable origin proteins D21H17/22; lignins D21H17/23; polysaccharides D21H17/24; rosin D21H17/62

D21H17/03

Non-macromolecular organic compounds

D21H17/04

Hydrocarbons

D21H17/05

containing elements other than carbon and hydrogen only

D21H17/06

Alcohols

Phenols

Ethers

Aldehydes

Ketones

Acetals

Ketals

D21H17/07

Nitrogen-containing compounds

D21H17/08

Isocyanates

D21H17/09

Sulfur-containing compounds

D21H17/10

Phosphorus-containing compounds

D21H17/11

Halides

D21H17/12

Organo-metallic compounds

D21H17/13

Silicon-containing compounds

D21H17/14

Carboxylic acids

Derivatives thereof

D21H17/15

Polycarboxylic acids, e.g. maleic acid

D21H17/16

Addition products thereof with hydrocarbons

D21H17/17

Ketenes, e.g. ketene dimers

D21H17/18

forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with itself, or other added substances, e.g. by grafting on the fibres

D21H17/19

by reactions only involving carbon-to-carbon unsaturated bonds

D21H17/20

Macromolecular organic compounds

D21H17/21

of natural origin

Derivatives thereof

D21H17/22

Proteins

D21H17/23

Lignins

D21H17/24

Polysaccharides

D21H17/25

Cellulose

D21H17/26

Ethers thereof

D21H17/27

Esters thereof

D21H17/28

Starch

D21H17/29

cationic

D21H17/30

Alginic acid or alginates

D21H17/31

Gums

D21H17/32

Guar

or other polygalactomannan

gum

D21H17/33

Synthetic macromolecular compounds

D21H17/34

obtained by reactions only involving carbon-to-carbon unsaturated bonds

D21H17/35

Polyalkenes, e.g. polystyrene

D21H17/36

Polyalkenyalcohols

Polyalkenylethers

Polyalkenylesters

D21H17/37

Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates

D21H17/375

Poly(meth)acrylamide

D21H17/38

containing crosslinkable groups

D21H17/39

forming ether crosslinkages, e.g. alkylol groups

D21H17/40

unsaturated

D21H17/41

containing ionic groups

D21H17/42

anionic

D21H17/43

Carboxyl groups or derivatives thereof

D21H17/44

cationic

D21H17/45

Nitrogen-containing groups

D21H17/455

comprising tertiary amine or being at least partially quaternised

D21H17/46

obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds

D21H17/47

Condensation polymers of aldehydes or ketones

D21H17/48

with phenols

D21H17/49

with compounds containing hydrogen bound to nitrogen

D21H17/50

Acyclic compounds

D21H17/51

Triazines, e.g. melamine

D21H17/52

Epoxy resins

D21H17/53

Polyethers

Polyesters

D21H17/54

obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen

D21H17/55

Polyamides

Polyaminoamides

Polyester-amides

D21H17/56

Polyamines

Polyimines

Polyester-imides

D21H17/57

Polyureas

Polyurethanes

D21H17/58

obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur

D21H17/59

obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon

D21H17/60

Waxes

D21H17/61

Bitumen

D21H17/62

Rosin

Derivatives thereof

D21H17/63

Inorganic compounds

D21H17/64

Alkaline compounds

D21H17/65

Acid compounds

D21H17/66

Salts, e.g. alums

D21H17/67

Water-insoluble compounds, e.g. fillers, pigments

D21H17/675

Oxides, hydroxides or carbonates

D21H17/68

siliceous, e.g. clays

D21H17/69

modified, e.g. by association with other compositions prior to incorporation in the pulp or paper

D21H17/70

forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately

D21H17/71

Mixtures of material D21H17/69 takes precedence; Pulp or paper comprising several different materials not incorporated by special processes D21H23/10, D21H23/70, D21H23/76 take precedence

D21H17/72

of organic material

D21H17/73

of inorganic material

D21H17/74

of organic and inorganic material

D21H19/00

Coated paper coated fibreboard D21J1/08

Coating material recording sheets characterised by the coating used to improve ink, dye or pigment receptivity B41M5/50

D21H19/02

Metal coatings D21H19/66 takes precedence

D21H19/04

applied as foil

D21H19/06

applied as liquid or powder

D21H19/08

applied as vapour, e.g. in vacuum

D21H19/10

Coatings without pigments D21H19/66 takes precedence

D21H19/12

applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds

D21H19/14

applied in a form other than the aqueous solution defined in group D21H19/12

D21H19/16

comprising curable or polymerisable compounds D21H19/24 takes precedence

D21H19/18

comprising waxes

D21H19/20

comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds

D21H19/22

Polyalkenes, e.g. polystyrene

D21H19/24

comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds

D21H19/26

Aminoplasts

D21H19/28

Polyesters

D21H19/30

Polyamides

Polyimides

D21H19/32

obtained by reactions forming a linkage containing silicon in the main chain of the macromolecule

D21H19/34

comprising cellulose or derivatives thereof

D21H19/36

Coatings with pigments D21H19/66 takes precedence; metal powder D21H19/06

D21H19/38

characterised by the pigments

D21H19/385

Oxides, hydroxides or carbonates

D21H19/40

siliceous, e.g. clays

D21H19/42

at least partly organic

D21H19/44

characterised by the other ingredients, e.g. the binder or dispersing agent

D21H19/46

Non-macromolecular organic compounds

D21H19/48

Diolefins, e.g. butadiene

Aromatic vinyl monomers, e.g. styrene

Polymerisable unsaturated acids or derivatives thereof, e.g. acrylic acid

D21H19/50

Proteins

D21H19/52

Cellulose

Derivatives thereof

D21H19/54

Starch

D21H19/56

Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds

D21H19/58

Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof

D21H19/60

Polyalkenylalcohols

Polyalkenylethers

Polyalkenylesters

D21H19/62

Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds

D21H19/64

Inorganic compounds

D21H19/66

Coatings characterised by a special visual effect, e.g. patterned, textured marbled paper D21H27/04

D21H19/68

uneven, broken, discontinuous

D21H19/70

with internal voids, e.g. bubble coatings

D21H19/72

Coated paper characterised by the paper substrate

D21H19/74

the substrate having an uneven surface, e.g. crêped or corrugated paper

D21H19/76

the substrate having specific absorbent properties

D21H19/78

being substantially impervious to the coating

D21H19/80

Paper comprising more than one coating D21H19/02 takes precedence

D21H19/82

superposed

D21H19/84 takes precedence

D21H19/822

two superposed coatings, both being pigmented

D21H19/824

two superposed coatings, both being non-pigmented

D21H19/826

two superposed coatings, the first applied being pigmented and the second applied being non-pigmented

D21H19/828

two superposed coatings, the first applied being non-pigmented and the second applied being pigmented

D21H19/84

on both sides of the substrate

D21H21/00

Non-fibrous material added to the pulp, characterised by its function, form or properties

Paper-impregnating or coating material, characterised by its function, form or properties

D21H21/02

Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control removal of fats, resins, pitch, or waxes D21C9/08

D21H21/04

Slime-control agents

D21H21/06

Paper forming aids

D21H21/08

Dispersing agents for fibres

D21H21/10

Retention agents or drainage improvers

D21H21/12

Defoamers

D21H21/14

characterised by function or properties in or on the paper D21H19/66, D21H27/02 take precedence

D21H21/143

Agents preventing ageing of paper, e.g. radiation absorbing substances

D21H21/146

Crêping adhesives

D21H21/16

Sizing or water-repelling agents

D21H21/18

Reinforcing agents

D21H21/20

Wet strength agents

D21H21/22

Agents rendering paper porous, absorbent or bulky

D21H21/24

Surfactants

D21H21/26

Agents rendering paper transparent or translucent

D21H21/28

Colorants

; Pigments or opacifying agents

D21H21/285

insoluble

D21H21/30

Luminescent or fluorescent substances, e.g. for optical bleaching D21H21/40 takes precedence

D21H21/32

Bleaching agents bleaching cellulose pulp D21C9/10

D21H21/34

Ignifugeants

D21H21/36

Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents

D21H21/38

Corrosion-inhibiting agents or anti-oxidants

D21H21/40

Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper watermarking B41M3/10, D21F1/44; security printing B41M3/14; securities or banknotes characterised by colour effects B42D25/29, B42D25/30; testing paper currency or valuable papers for genuineness G07D7/00

D21H21/42

Ribbons or strips filaments D21H15/06

D21H21/44

Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods

D21H21/46

Elements suited for chemical verification or impeding chemical tampering, e.g. by use of eradicators

D21H21/48

Elements suited for physical verification, e.g. by irradiation

D21H21/50

characterised by form D21H19/66, D21H21/42, D21H27/02 take precedence

D21H21/52

Additives of definite length or shape

D21H21/54

being spherical, e.g. microcapsules, beads

D21H21/56

Foam

D21H23/00

Processes or apparatus for adding material to the pulp or to the paper applying liquids or other fluent material to surfaces, in general B05; processes for making continuous lengths of paper D21F11/00

Processes or apparatus used for addition to the paper during its manufacture, i.e. on-machine, are classified in groups D21H23/24 - D21H23/28 if they are specially influenced by, or specially adapted to the paper-making process.

D21H23/02

characterised by the manner in which substances are added

D21H23/04

Addition to the pulp

After-treatment of added substances in the pulp

D21H23/06

Controlling the addition

D21H23/08

by measuring pulp properties, e.g. zeta potential, pH

D21H23/10

at least two kinds of compounds being added

D21H23/12

by measuring properties of the formed web

D21H23/14

by selecting point of addition or time of contact between components

D21H23/16

Addition before or during pulp beating or refining disintegrating fibrous raw materials in mills in the presence of chemical agents D21B1/16; methods of beating D21D1/02; methods of refining D21D1/20

D21H23/18

Addition at a location where shear forces are avoided before sheet-forming, e.g. after pulp beating or refining

D21H23/20

Apparatus therefor

D21H23/22

Addition to the formed paper

D21H23/24

during paper manufacture

D21H23/26

by selecting point of addition or moisture content of the paper

D21H23/28

Addition before the dryer section, e.g. at the wet end or press section

D21H23/30

Pretreatment of the paper D21H23/70, D21H23/76 take precedence

D21H23/32

by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper D21H23/66 takes precedence; removing excess material D21H25/08

D21H23/34

Knife or blade type coaters

D21H23/36

Knife or blade forming part of the fluid reservoir, e.g. puddle-type trailing blade

or short-dwell coaters

D21H23/38

the fluid material being applied with a special device, e.g. with a roll in a flooded-nip inverted blade coater

D21H23/40

only one side of the paper being in contact with the material D21H23/34 takes precedence

D21H23/42

Paper being at least partly surrounded by the material on both sides D21H23/34 takes precedence

D21H23/44

Treatment with a gas or vapour

D21H23/46

Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper D21H23/66 takes precedence

D21H23/48

Curtain coaters

D21H23/50

Spraying or projecting D21H23/44, D21H23/66 take precedence

D21H23/52

by contacting paper with a device carrying the material D21H23/32, D21H23/46, D21H23/66 take precedence

D21H23/54

Rubbing devices, e.g. brush, pad, felt

D21H23/56

Rolls D21H23/38 takes precedence

D21H23/58

Details thereof, e.g. surface characteristics, peripheral speed

D21H23/60

the material on the applicator roll being subjected to a particular treatment before applying to the paper D21H23/64 takes precedence

D21H23/62

Reverse roll coating, i.e. applicator roll surface moving in direction opposite to that of the paper

D21H23/64

the material being non-fluent at the moment of transfer, e.g. in form of preformed, at least partially hardened coating

D21H23/66

Treating discontinuous paper, e.g. sheets, blanks, rolls

D21H23/68

whereby the paper moves continuously

D21H23/70

Multistep processes

Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group

D21H23/72

Plural serial stages only

D21H23/74

Apparatus permitting switching from one technique to another

D21H23/76

characterised by choice of auxiliary compounds which are added separately from at least one other compound, e.g. to improve the incorporation of the latter or to obtain an enhanced combined effect D21H17/18, D21H17/70, D21H23/10 take precedence

D21H23/765

Addition of all compounds to the pulp

D21H23/78

Controlling or regulating not limited to any particular process or apparatus

D21H25/00

After-treatment of paper not provided for in groups D21H17/00 - D21H23/00

D21H25/005

Mechanical treatment D21H25/08, D21H25/18 take precedence

D21H25/02

Chemical or biochemical treatment D21H25/18 takes precedence

D21H25/04

Physical treatment, e.g. heating, irradiating D21H25/18 takes precedence; dryer section of machines for making continuous webs of paper D21F5/00

D21H25/06

of impregnated or coated paper D21H25/08 takes precedence

D21H25/08

Rearranging applied substances, e.g. metering, smoothing

Removing excess material

D21H25/10

with blades

D21H25/12

with an essentially cylindrical body, e.g. roll or rod

D21H25/14

the body being a casting drum

, a heated roll or a calender

D21H25/16

with a blast of vapour or gas, e.g. air knife

D21H25/18

of old paper as in books, documents, e.g. restoring

D21H27/00

Special paper not otherwise provided for, e.g. made by multi-step processes

This group provides for the classification of paper with special properties or applications which are only partially or not at all provided for elsewhere in the classification. Whenever possible, however, these papers are classified according to the criteria used in the other groups of this subclass.

D21H27/001

Release paper

D21H27/002

Tissue paper; Absorbent paper D21H21/22, D21H27/02, D21H27/20 take precedence; toilet paper A47K10/00; absorbent pads for physiological fluids A61L15/16; making on paper-making machines D21F11/00

D21H27/004

characterised by specific parameters D21H27/008 takes precedence

D21H27/005

relating to physical or mechanical properties, e.g. tensile strength, stretch, softness

D21H27/007

relating to absorbency, e.g. amount or rate of water absorption, optionally in combination with other parameters relating to physical or mechanical properties

D21H27/008

characterised by inhomogeneous distribution or incomplete coverage of properties, e.g. obtained by using materials of chemical compounds D21H23/02, D21H23/76, D21H27/02 take precedence

D21H27/02

Patterned paper patterned coatings D21H19/66; embossing B31F1/07; prepared on the paper-making machines D21F11/00

D21H27/04

marbled

D21H27/06

Vegetable or imitation parchment

Glassine paper

D21H27/08

Filter paper self-supporting filtering material B01D39/14; making on paper-making machines D21F11/14

D21H27/10

Packing paper packaging materials of special type or form B65D65/38

D21H27/14

Paper having stable form or dimension

Curl-resistant paper anticoil photographic support G03C1/81

D21H27/16

Pure paper, i.e. paper lacking or having low content of contaminants after-treatment of cellulose pulp D21C9/00

D21H27/18

Paper- or board-based structures for surface covering

D21H27/20

Flexible structures being applied by the user, e.g. wallpaper printed wallpapers B41M3/18; paperhanging B44C7/00; pregummed wallpaper C09J7/21

D21H27/22

Structures being applied on the surface by special manufacturing processes, e.g. in presses

D21H27/24

characterised by the surface to be covered being phenolic-resin paper laminates, vulcan fibre or similar cellulosic fibreboards

D21H27/26

characterised by the overlay sheet or the top layers of the structures decorative panels B44C5/04; wood grain effects B44F9/02

D21H27/28

treated to obtain specific resistance properties, e.g. against wear or weather water-repelling agents D21H21/16

D21H27/30

Multi-ply for surface covering D21H27/18; making on paper-making machines D21F9/00, D21F11/00

Layered products classified in this group are also classified in subclass B32B

D21H27/32

with materials applied between the sheets attaching together paper or cardboard sheets B31F5/00; adhesives C09J

D21H27/34

Continuous materials, e.g. filaments, sheets, nets

D21H27/36

Films made from synthetic macromolecular compounds

D21H27/38

at least one of the sheets having a fibrous composition differing from that of other sheets

D21H27/40

at least one of the sheets being non-planar, e.g. crêped crêping or corrugating paper B31F

D21H27/42

comprising dry-laid paper