Addition to the formed paper

Full Title

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) > characterised by the manner in which substances are added > Addition to the formed paper

Child Classifications

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• D21H 23/24 during paper manufacture
• D21H 23/30 Pretreatment of the paper (D21H23/70, D21H23/76 take precedence)
• D21H 23/32 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)
• D21H 23/46 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)
• D21H 23/50 Spraying or projecting (D21H23/44, D21H23/66 take precedence)
• D21H 23/52 by contacting paper with a device carrying the material (D21H23/32, D21H23/46, D21H23/66 take precedence)
• D21H 23/66 Treating discontinuous paper, e.g. sheets, blanks, rolls
• D21H 23/70 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