Tension ascension knife coating method

Details Tension ascension knife coating method Tension ascension knife coating method

B - Operations, Transporting

05

D

B05D 1/26 (2006.01) B05C 3/18 (2006.01) B05C 5/02 (2006.01)

Patent

CA 2199718

To knife-coat elastic liquids without the presence of flow instability, the extension rate in the upstream region of the coating bead is kept low by increasing the distance over which the liquid must accelerate. The onset of the flow instability is delayed by insuring that the upstream liquid-air interface of the coating bead is relatively long and flat. This is accomplished by allowing the elastic liquid to pull itself over a relatively large distance out of a trough and into the knifing passage. The liquid is able to ascend into the knifing passage by virtue of liquid tension developed by the extensional flow in the upstream region of the coating bead.

Pour effectuer l'enduction à la râcle de liquides élastiques sans instabilité de l'écoulement, le taux d'étirement de la région amont du bourrelet de matière peut être réduit par un accroissement de la distance sur laquelle le liquide doit accélérer. L'apparition de l'instabilité de l'écoulement se trouve retardée si l'interface amont liquide-air du bourrelet est relativement longue et plate. On obtient une telle interface en permettant au liquide élastique de s'étirer de lui même sur une distance relativement longue de la sortie de la cuve jusqu'au passage d'enduction. Le liquide peut s'élever dans ledit passage en développant une tension due à l'étirement de l'écoulement dans la région amont du bourrelet.

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