Method for die casting three-layer articles and apparatus...

B - Operations – Transporting – 29 – C

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B29C 45/16 (2006.01) B29C 45/27 (2006.01)

Patent

CA 2217355

A method of injection-molding three-layer moldings, especially bottle blanks, having inner and outer layers of a "material A" and of a "material B". Material B can be a material that acts as a barrier against the gases O2, CO2, and SO2, and against water vapor (H2O). The method employs a device that comprises at least one mold and at least one flat hot runner. The mold has several cavities and the hot runner has the same number of dies. Material A is supplied to the cavities (1.1) through an annular gap between the inner (2.1) and the outer (2.2) component of each die. Material B is forced into the cavities through a hollow needle (3) that extends through the center of the inner die component by a piston (4) that is integrated into the die and cannot rotate. The needle has a port (6) that opens into it at a right angle and remains open as long as the needle remains advanced, in a closing position, and that is blocked when the needle is retracted. A reservoir (3.3) constituted by the hollow inside the needle is charged through the port while the needle is in its closing position.

Méthode de moulage par injection d'articles triple couche, notamment des flans de bouteille comportant une couche intérieure constituée d'un matériau "A" et une couche extérieure constituée d'un matériau "B". Le matériau "B" peut servir de barrière aux gaz O2, CO2 et SO2 et de coupe-vapeur (H2O). La méthode fait appel à une installation qui comporte au moins un moule et au moins un canal chauffé de forme aplatie. Le moule comporte plusieurs cavités et le canal chauffé comporte le même nombre de matrices. Le matériau "A" est introduit dans les cavités (1.1) à travers un espacement annulaire entre l'élément interne (2.1) et l'élément externe (2.2) de chaque matrice. Le matériau "B" est introduit dans les cavités par une aiguille d'injection (3) qui traverse le centre de l'élément interne sous la pression d'un piston (4) qui, intégré à la matrice, ne peut tourner sur lui-même. L'aiguille possède un orifice (6) qui ouvre à angle droit et qui reste ouvert tant que l'aiguille avance à l'intérieur du moule, et qui se ferme dès que l'aiguille amorce son rappel. Formé par le creux à l'intérieur de l'aiguille, le réservoir (3.3) est rempli par l'orifice de l'aiguille lorsque celle-ci se trouve en position de rappel.

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