Coinjection nozzle

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/20 (2006.01) B29C 45/16 (2006.01)

Patent

CA 2530031

Disclosed is a coinjection nozzle for a two-component injection molding tool, which is used for producing parisons. The inventive nozzle comprises a nozzle holder (1) and an nozzle tip (4) that is mounted therein. A shut-off needle (11) is directed within a needle guide (3) at least in a top portion (K) of the needle tip (4). An additional nozzle sleeve (2) is disposed between the needle guide (3) and the nozzle tip (4). A first tubular delivery duct (A) extends between the nozzle sleeve (2) and the nozzle tip (4) while a second tubular delivery duct (B) extends between the nozzle sleeve (2) and the needle guide (3). The needle guide (3) is provided with a conical needle-guiding head (3a) located in the top portion (K) of the nozzle. A throat is provided in the first tubular delivery duct (A) in the area (E) of the nozzle. The needle- guiding head (3a) and the nozzle sleeve (2) are shaped in such a way that the second tubular delivery duct (B) narrows in a final area so as to form a shear edge (F).

L'invention concerne une buse de co-injection conçue pour un outil de moulage par injection à deux composants servant à former des préformes. Cette buse comprend un porte-buse (1), ainsi qu'une pointe de buse (4) positionnée dans ledit porte-buse. Une aiguille d'obturation (11) est guidée dans un élément de guidage d'aiguille (3), au moins dans une zone de tête (K) de la pointe de buse (4). Une douille de buse (2) supplémentaire est disposée entre l'élément de guidage d'aiguille (3) et la pointe de buse (4). Un premier canal d'alimentation tubulaire (A) s'étend entre la douille de buse (2) et la pointe de buse (4). Un deuxième canal d'alimentation tubulaire (B) s'étend entre la douille de buse (2) et l'élément de guidage d'aiguille (3). Cet élément de guidage d'aiguille (3) comprend une tête d'élément de guidage d'aiguille (3a) de forme conique, au niveau de la zone de tête (K) de la buse. Le premier canal d'alimentation tubulaire (A) est plus étroit dans une zone (E) de la buse. La tête d'élément de guidage d'aiguille (3a) et la douille de buse (2) sont formées de façon que le deuxième canal d'alimentation tubulaire (B) soit plus étroit au niveau d'une zone terminale, pour former une arête de cisaillement (F).

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