METHOD OF MANUFACTURING A MULTILAYER PSA BY SLOT COATING AND DIE

    公开(公告)号:CA2200191A1

    公开(公告)日:1996-03-21

    申请号:CA2200191

    申请日:1995-09-15

    Abstract: 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.

    Secador de placas y método de secado de revestimientos a base de disolvente

    公开(公告)号:ES2625072T3

    公开(公告)日:2017-07-18

    申请号:ES12759842

    申请日:2012-08-09

    Abstract: Un aparato (10) para secar, curar, o desairear una banda en continuo movimiento (120) que porta una capa de disolvente (130), que comprende: una carcasa (140) que encierra una cámara de secado (150), teniendo dicha carcasa (140) ranuras de entrada y de salida (160) a través de las cuales puede pasar dicha banda (120) por dicha cámara (150); teniendo dichas ranuras de entrada y de salida (160) un mecanismo de cierre hermético para evitar que se filtre aire ambiente al interior de la cámara de secado (150), o fugas de la corriente de gas desde la cámara (150) al ambiente; una placa calentada inferior (170) y una placa calentada superior (180) sustancialmente paralelas entre sí con un espacio (4) entre ellas, al menos una entrada (191) para una corriente de gas (200) que fluye a la cámara (150); al menos una salida (192) para que la corriente de escape fluya fuera de la cámara (150), caracterizada porque dicho espacio (4) no es mayor que una distancia de 10 cm; la banda que porta una capa de disolvente se encuentra a menos de 20 mm de la placa calentada inferior; y la banda portadora (120) está más cerca de la placa calentada inferior (170) que de la placa calentada superior (180).

    40.
    发明专利
    未知

    公开(公告)号:BR9508956A

    公开(公告)日:1998-01-06

    申请号:BR9508956

    申请日:1995-09-14

    Abstract: There is provided a laminate of a backing, a layer of permanent pressure-sensitive adhesive and a layer of removable pressure-sensitive adhesive, the latter being in contact with a release surface of a release liner or the opposed surface of the backing. The removable pressure-sensitive adhesive is provided at a coat weight of at least 10 gsm and at coat weight ratio to the permanent pressure-sensitive adhesive of at least 1:1.

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