Wet end starch application

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 23/28 (2006.01) D21H 17/28 (2006.01) D21H 23/48 (2006.01)

Patent

CA 2244876

A suspension of uncooked starch and water is applied to web forming on the wire (12) of a paper machine. The suspension at a consistency of 2-10 % is applied to the surface of the web as a free falling curtain (30) from the downwardly opening extrusion slot of a coater die (25). The die lips are chilled to produce sweating by moisture condensation to prevent build-up of coating particles on the die lips. The feed-through passage of the die is tapered in cross section between inlet and outlet to maintain turbulent flow condition which maintains the particulate material of the coating in suspension.

Cette invention se rapporte à une suspension d'amidon non cuit et d'eau que l'on applique en vue de la formation d'une bande continue de papier sur le formeur (12) d'une machine à papier. La suspension, de consistance comprise entre 2 et 10 %, est appliquée à la surface de la bande de papier sous la forme d'un rideau tombant en chute libre (30) de la fente d'extrusion ouverte vers le bas d'une filière de coucheuse (25). Les lèvres de la filière sont refroidies de façon à produire une transpiration par condensation d'humidité permettant d'éviter l'accumulation de particules de la sauce de couchage sur les lèvres de la filière. Le passage de traversée de la filière possède une coupe en travers de forme conique, entre l'orifice d'entrée et l'orifice de sortie, de façon à entretenir des conditions de flux turbulent qui permettent de maintenir la matière particulaire de la sauce en couchage.

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