Manifold system having flow control

Details Manifold system having flow control Manifold system having flow control

B - Operations, Transporting

29

C

B29C 45/28 (2006.01) B29C 45/27 (2006.01) B29C 45/30 (2006.01)

Patent

CA 2385016

An injection molding apparatus and method are provided in which the rate of material flow during an injection cycle is controlled. According to one preferred embodiment, an injection molding apparatus is provided that includes a manifold (231), at least one injection nozzle (215) coupled to the manifold, an actuator, and a valve pin (200) adapted to reciprocate through the manifold and the injection nozzle. The valve pin (200) has a first end coupled to the actuator, a second end that closes the gate (211) in a forward position, and a control surface (205) intermediate said first and second ends for adjusting the rate of material flow during an injection cycle. Retracting the valve pin tends to decrease the rate of material flow during the injection cycle and displacing the valve pin toward the gate (211) tends to increase the rate of material flow during the injection cycle.

La présente invention concerne une presse à injection et un procédé permettant une régulation du débit de matière pendant un cycle d'injection. Selon un mode de réalisation préféré, l'invention concerne une presse à injection comportant une rampe de distribution (231), au moins une buse d'injection (215) couplée à la rampe de distribution, un actionneur, et une goupille de soupape (200) conçue pour battre en va-et-vient dans la rampe de distribution et la buse d'injection. Une première extrémité de la goupille de soupape (200) est couplée à l'actionneur, l'autre extrémité fermant l'orifice (211) en position avancée, une surface de régulation (205) entre les deux extrémités permettant de régler le débit de matière pendant un cycle d'injection. Le mouvement de retrait de la goupille de soupape tend à faire baisser le débit de matière pendant le cycle d'injection et le rappel de la goupille de soupape vers l'orifice (211) tend à augmenter le débit de matière pendant le cycle d'injection.

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