Method for the uniform application of a coating to a tubular...

B - Operations – Transporting – 05 – D

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B05D 1/26 (2006.01)

Patent

CA 2637227

The invention relates to a method for the uniform application of a coating of reactive coating materials, preferably polyurethane components, to tubular walls (20), and also relates to a coating device and a composite tube produced by means thereof. In order to apply a uniform coating thickness, it is proposed according to the invention that the tubular wall (20) is supplied continuously into a coating device (1) in which coating materials are supplied to at least one distributing duct which opens towards the tubular wall (20) and merges in the direction of transport into a coating duct (14), wherein the coating materials flow into the distributing duct (12) without a dead volume and pass from there to the surface of the tubular wall (20) and are held in a tightly restricted space until solidification. This measure ensures that, taking into consideration the transport speed of the tubular wall (20) and the length of the coating duct, hardening of the coating materials has initiated before the tubular wall (20) exits the coating device (1), and therefore a very precisely maintained layer thickness is generated.

L'invention concerne un procédé d'application uniforme d'un revêtement en matériaux réactifs, de préférence en composants de polyuréthane, sur des parois tubulaires (20), ainsi qu'un dispositif de revêtement et le tube composite fabriqué avec ce dernier. Pour appliquer une couche d'épaisseur uniforme, il est prévu selon l'invention de faire avancer en continu la paroi tubulaire (20) dans un dispositif de revêtement (1) dans lequel les matériaux de revêtement sont apportés à au moins un canal de répartition qui débouche contre la paroi tubulaire (20) et qui se prolonge dans la direction du transport par un canal de revêtement (14). Les matériaux de revêtement s'écoulent dans le canal de répartition (12) sans laisser de volume mort et de là, passent sur la surface de la paroi tubulaire (20) et sont maintenus dans un espace étroitement limité jusqu'à leur solidification. Ces dispositions garantissent qu'en fonction de la vitesse de transport de la paroi tubulaire (20) et de la longueur du canal de revêtement, les matériaux de revêtement peuvent durcir avant que la paroi tubulaire (20) soit sortie du dispositif de revêtement (1), ce qui permet d'obtenir une couche dont l'épaisseur est respectée de manière précise.

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