Controlling delivery of polymer material in a sequential...

B - Operations – Transporting – 29 – C

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B29C 45/16 (2006.01) B29C 45/27 (2006.01) B29C 45/28 (2006.01) B29C 45/76 (2006.01)

Patent

CA 2653063

Method and apparatus for controlling the delivery of polymer material in a sequential injection molding process. In one embodiment, the method provides: delivering a first shot of a first material simultaneously to a plurality of mold cavities; (14a-14i) independently sensing for each cavity a property that is indicative of a volume or flow of material that is delivered to the corresponding cavity during the step of delivering the first shot; independently stopping the step of delivering the first shot to one or more cavities according to a program that uses as a variable a signal indicative of the property sensed for the corresponding cavity during delivery of the first shot; and delivering a second shot of a second material simultaneously to the cavities subsequent to the step of stopping the step of delivering the first shot.

L'invention concerne un procédé et un dispositif de commande de la distribution de matériau polymère dans un processus de moulage par injection séquentielle. Dans un mode de réalisation, le procédé consiste à distribuer un premier jet d'un premier matériau simultanément dans une pluralité de cavités de moulage; (14a-14i) à détecter indépendamment pour chaque cavité une propriété caractéristique d'un volume ou d'un flux de matériau distribué dans la cavité correspondante lors de l'étape de distribution du premier jet; à achever indépendamment l'étape de distribution du premier jet dans une ou plusieurs cavités selon un programme employant en tant que variable un signal caractéristique de la propriété détectée pour la cavité correspondante au cours de la distribution du premier jet; et à distribuer un deuxième jet d'un deuxième matériau simultanément dans les cavités à la suite de l'étape d'achèvement de l'étape de distribution du premier jet.

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