Method of manufacturing a multilayer psa by slot coating and...

B - Operations – Transporting – 05 – D

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Details

B05D 1/34 (2006.01) B05C 5/02 (2006.01) B05C 9/06 (2006.01) B05D 5/10 (2006.01) C09J 7/02 (2006.01) G03C 1/74 (2006.01)

Patent

CA 2200191

A method and apparatus for simultaneously coating multiple thin layers of relatively viscous fluids, including pressure sensitive adhesives (PSAs), onto a moving substrate. The method of the present invention comprises the adjustment of the pressure gradients in the interface region between two confluent flows so as to avoid recirculation therein. In particular, the pressure gradient along the middle lip is regulated so as to not be excessively positive, in order to position the separating line between the top and bottom flows at a particular point on the die lips, thus enhancing stable flow. In the apparatus of the present invention, a step configuration is formed on the die lips so that the downstream lip steps away from the web in the direction of web travel. In another aspect of the invention, the pressure gradient at various locations in the bead is controlled by beveling the upstream and downstream lips. In yet a further aspect of the present invention, the viscosities of the two liquids being coated are matched at therelevant shear rates to promote good coating quality.

L'invention concerne un procédé et un appareil pour appliquer simultanément plusieurs couches minces de fluides relativement visqueux, y compris des auto-adhésifs, sur un substrat mobile. Le procédé consiste également à ajuster les gradients de pression dans la zone d'interface entre deux écoulements confluents afin d'éviter toute recirculation dans cette zone. En particulier, le gradient de pression le long de la lèvre intermédiaire de la filière est régulé de manière à ne pas être trop positif, afin de positionner la ligne de séparation entre les écoulements supérieur et inférieur, en un point particulier, sur les lèvres de la filière, ce qui augmente la stabilité de l'écoulement. Dans l'appareil selon l'invention, une configuration en gradin est prévue sur les lèvres de la filière de sorte que la lèvre aval s'écarte de la bande dans le sens d'avance de cette dernière. Selon un autre aspect de la présente invention, le gradient de pression en différents emplacements dans le cordon est contrôlé en chanfreinant les lèvres amont et aval. Selon encore un autre aspect de la présente invention, les viscosités des deux liquides appliqués sont adaptées à des taux de cisaillement appropriés pour assurer une bonne qualité de revêtement

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