Method and apparatus for curtain coating

B - Operations – Transporting – 05 – C

Patent

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B05C 5/02 (2006.01)

Patent

CA 2469470

An apparatus for curtain coating, particularly for high-speed curtain coating of a continuous paper web substrate (12) is provided with a hopper means (14) providing one or more liquid coating materials in the form of a free-falling curtain (16) impinging the substrate (12) at a dynamic wetting line. Edge guide elements (22, 24) are arranged on both sides supplying a wetting or auxiliary liquid. Each guide element (22, 24) has at least one contact area of its surface directed towards said curtain, which contact area has a multiplicity of grooves (32) and ribs (34) extending along the length of said edge guide elements (22, 24).

L'invention concerne un dispositif d'enduction au rideau, en particulier pour l'enduction au rideau, à vitesse élevée, d'un substrat (12) se présentant sous la forme d'une bande de papier continue. Ce dispositif comprend une trémie (14) fournissant au moins un matériau d'enduction liquide sous la forme d'un rideau (16) coulant librement, venant en contact avec le substrat (12) au niveau d'une ligne de mouillage dynamique. Des éléments de guidage marginaux (22, 24) sont disposés sur les deux côtés du dispositif et fournissent un liquide de mouillage ou un liquide auxiliaire. Au moins une zone de contact de la surface de chaque élément de guidage (22, 24) est dirigée vers ledit rideau et présente une pluralité de gorges (32) et de nervures (34) s'étendant le long desdits éléments de guidage marginaux (22, 24).

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