Mold-masters (2007) Limited

Mold-masters Limited

Vijay Kudchadkar

Fabrice Fairy

Peter Klobucar

Neil Dewar

Hakim Boxwala

An injection molding apparatus, such as a hot runner or hot half, includes a manifold having a manifold channel and a nozzle having a nozzle channel. The nozzle is coupled to the manifold, and the manifold channel and the nozzle channel are in communication to define a flow channel. A valve pin bushing has a flow restrictor disposed in the flow channel on an upstream side of the valve pin bushing. A moveable valve pin extends through a bore of the valve pin bushing.

Injection molding apparatus having a valve pin bushing

A manifold of an injection molding apparatus includes a primary melt channel and secondary melt channels extending from the primary melt channel. A shear rod is disposed at the junction between the primary and secondary melt channels. The shear rod extends from the junction into the primary melt channel and is disposed substantially parallel to the longitudinal axis of the primary melt channel.

Melt balancing element in a manifold melt channel

An injection molding system is disclosed having a self-regulating valve for balancing melt flow. The self-regulating valve includes a control rod configured to balance the melt flow rate through a hot runner system. The self-regulating valve reacts to an injection or melt pressure within the hot runner system and a pre-set force provided by an external force device. The self-regulating valve is an open-loop system as it requires neither a measurement of pressure by a sensor nor feedback from a processor in order to regulate the melt flow. The self-regulating valve mechanically reacts to changes in melt pressure on control surfaces thereof by 'bobbing' upwards/downwards to decrease/increase the melt flow accordingly. The self-regulating valve compensates for conditions that affect melt pressure, such as an increase/decrease in melt viscosity, changes in melt temperature, and/or mold cavity size without the use of a processing device.

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Toronto, Canada

Vijay Kudchadkar