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  • 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 D21F 11/00) [5] HB CC 4L055
  • D21H23/02
    		•  .characterised by the manner in which substances are added [5] HB CC 4L055
  • D21H23/04
    		•  ..Addition to the pulp; After-treatment of added substances in the pulp [5] HB CC 4L055
  • D21H23/06
    		•  ...Controlling the addition [5] HB CC 4L055
  • D21H23/08
    		•  ....by measuring pulp properties, e.g. zeta potential, pH [5] HB CC 4L055
  • D21H23/10
    		•  .....at least two kinds of compounds being added [5] HB CC 4L055
  • D21H23/12
    		•  ....by measuring properties of the formed web [5] HB CC 4L055
  • D21H23/14
    		•  ....by selecting point of addition or time of contact between components [5] HB CC 4L055
  • D21H23/16
    		•  .....Addition before or during pulp beating or refining (disintegrating fibrous raw materials in mills in the presence of chemical agents D21B 1/16; methods of beating D21D 1/02; methods of refining D21D 1/20) [5] HB CC 4L055
  • D21H23/18
    		•  .....Addition at a location where shear forces are avoided before sheet-forming, e.g. after pulp beating or refining [5] HB CC 4L055
  • D21H23/20
    		•  ...Apparatus therefor [5] HB CC 4L055
  • D21H23/22
    		•  ..Addition to the formed paper [5] HB CC 4L055
  • D21H23/24
    		•  ...during paper manufacture
    		HB CC 4L055
  • D21H23/26
    		•  ....by selecting point of addition or moisture content of the paper [5] HB CC 4L055
  • D21H23/28
    		•  .....Addition before the dryer section, e.g. at the wet end or press section [5] HB CC 4L055
  • D21H23/30
    		•  ...Pretreatment of the paper (D21H 23/70, D21H 23/76 take precedence) [5] HB CC 4L055
  • 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 (D21H 23/66 takes precedence; removing excess material D21H 25/08) [5] HB CC 4L055
  • D21H23/34
    		•  ....Knife or blade type coaters [5] HB CC 4L055
  • D21H23/36
    		•  .....Knife or blade forming part of the fluid reservoir, e.g. puddle-type trailing blade [5] HB CC 4L055
  • D21H23/38
    		•  .....the fluid material being applied with a special device, e.g. with a roll in a flooded-nip inverted blade coater [5] HB CC 4L055
  • D21H23/40
    		•  ....only one side of the paper being in contact with the material (D21H 23/34 takes precedence) [5] HB CC 4L055
  • D21H23/42
    		•  ....Paper being at least partly surrounded by the material on both sides (D21H 23/34 takes precedence) [5] HB CC 4L055
  • D21H23/44
    		•  .....Treatment with a gas or vapour [5] HB CC 4L055
  • 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 (D21H 23/66 takes precedence) [5] HB CC 4L055
  • D21H23/48
    		•  ....Curtain coaters [5] HB CC 4L055
  • D21H23/50
    		•  ...Spraying or projecting (D21H 23/44, D21H 23/66 take precedence) [5] HB CC 4L055
  • D21H23/52
    		•  ...by contacting paper with a device carrying the material (D21H 23/32, D21H 23/46, D21H 23/66 take precedence) [5] HB CC 4L055
  • D21H23/54
    		•  ....Rubbing devices, e.g. brush, pad, felt [5] HB CC 4L055
  • D21H23/56
    		•  ....Rolls (D21H 23/38 takes precedence) [5] HB CC 4L055
  • D21H23/58
    		•  .....Details thereof, e.g. surface characteristics, peripheral speed [5] HB CC 4L055
  • D21H23/60
    		•  ......the material on the applicator roll being subjected to a particular treatment before applying to the paper (D21H 23/64 takes precedence) [5] HB CC 4L055
  • D21H23/62
    		•  ......Reverse roll coating, i.e. applicator roll surface moving in direction opposite to that of the paper [5] HB CC 4L055
  • D21H23/64
    		•  ....the material being non-fluent at the moment of transfer, e.g. in form of preformed, at least partially hardened coating [5] HB CC 4L055
  • D21H23/66
    		•  ...Treating discontinuous paper, e.g. sheets, blanks, rolls [5] HB CC 4L055
  • D21H23/68
    		•  ....whereby the paper moves continuously [5] HB CC 4L055
  • 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 [5] HB CC 4L055
  • D21H23/72
    		•  ....Plural serial stages only [5] HB CC 4L055
  • D21H23/74
    		•  ....Apparatus permitting switching from one technique to another [5] HB CC 4L055
  • 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 (D21H 17/18, D21H 17/70, D21H 23/10 take precedence) [5] HB CC 4L055
  • D21H23/78
    		•  .Controlling or regulating not limited to any particular process or apparatus [5] HB CC 4L055
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