Processes or apparatus for adding material to the pulp or to the paper

Industry

  • CPC
  • D21H23/00
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Sub Industries

D21H23/02characterised by the manner in which substances are added D21H23/04Addition to the pulp After-treatment of added substances in the pulp D21H23/06Controlling the addition D21H23/08by measuring pulp properties D21H23/10at least two kinds of compounds being added D21H23/12by measuring properties of the formed web D21H23/14by selecting point of addition or time of contact between components D21H23/16Addition before or during pulp beating or refining D21H23/18Addition at a location where shear forces are avoided before sheet-forming D21H23/20Apparatus therefor D21H23/22Addition to the formed paper D21H23/24during paper manufacture D21H23/26by selecting point of addition or moisture content of the paper D21H23/28Addition before the dryer section D21H23/30Pretreatment of the paper D21H23/32by contacting paper with an excess of material D21H23/34Knife or blade type coaters D21H23/36Knife or blade forming part of the fluid reservoir D21H23/38the fluid material being applied with a special device D21H23/40only one side of the paper being in contact with the material D21H23/42Paper being at least partly surrounded by the material on both sides D21H23/44Treatment with a gas or vapour D21H23/46Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper D21H23/48Curtain coaters D21H23/50Spraying or projecting D21H23/52by contacting paper with a device carrying the material D21H23/54Rubbing devices D21H23/56Rolls D21H23/58Details thereof D21H23/60the material on the applicator roll being subjected to a particular treatment before applying to the paper D21H23/62Reverse roll coating D21H23/64the material being non-fluent at the moment of transfer D21H23/66Treating discontinuous paper D21H23/68whereby the paper moves continuously D21H23/70Multistep 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 D21H23/72Plural serial stages only D21H23/74Apparatus permitting switching from one technique to another D21H23/76characterised by choice of auxiliary compounds which are added separately from at least one other compound D21H23/765Addition of all compounds to the pulp D21H23/78Controlling or regulating not limited to any particular process or apparatus

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