An injection molding system and method are disclosed. The injection molding system includes a molding device and injector. The molding device defines a mold cavity and includes an inlet portion in communication with the mold cavity. The injector includes a discharging channel. An end portion of the inlet portion and an end portion of the discharging channel have non-planar end surfaces respectively, which are engageable with each other.

A method for manufacturing an impeller with a number of impeller blades and a cover disc covering the impeller blades. Plastic is injected into an injection mold using a cascade injection molding process to form the impeller. The injection mold has a number of shut-off nozzles to feed the plastic at various joint positions and different opening times. The number of shut-off nozzles is determined as a function of the number of impeller blades.

A method for manufacturing an impeller with a number of impeller blades and a cover disc covering the impeller blades. Plastic is injected into an injection mold using a cascade injection molding process to form the impeller. The injection mold has a number of shut-off nozzles to feed the plastic at various joint positions and different opening times. The number of shut-off nozzles is determined as a function of the number of impeller blades.

An injector body for injection molding is described mountable on a plate, wherein such injector body is formed of a first portion juxtaposed with a second portion, the first portion being elongated along an axis and provided internally with a first longitudinal channel to carry molten material to a nozzle located at the end of the first channel in correspondence of one end of the first portion, and the second portion being a radial widening of the first portion about said axis and internally provided with a second channel that crosses the thickness of the second portion and joins the first channel extending obliquely to said axis.

An injector body for injection molding is described mountable on a plate, wherein such injector body is formed of a first portion juxtaposed with a second portion, the first portion being elongated along an axis and provided internally with a first longitudinal channel to carry molten material to a nozzle located at the end of the first channel in correspondence of one end of the first portion, and the second portion being a radial widening of the first portion about said axis and internally provided with a second channel that crosses the thickness of the second portion and joins the first channel extending obliquely to said axis.

Upper and lower temperature control plates of upper and temperature control plate members are attacked so as to interpose a manifold body of a manifold therebetween. Upper and lower oil flow circuits provided in the respective upper and lower temperature control plates control the temperature of the manifold body heated by a plurality of coil heaters to a temperature suitable for preventing carbonization of a molten resin flowing in a flow-dividing type flow path of the manifold body.

Upper and lower temperature control plates of upper and temperature control plate members are attacked so as to interpose a manifold body of a manifold therebetween. Upper and lower oil flow circuits provided in the respective upper and lower temperature control plates control the temperature of the manifold body heated by a plurality of coil heaters to a temperature suitable for preventing carbonization of a molten resin flowing in a flow-dividing type flow path of the manifold body.

A melt distributor has an orifice for receiving molten plastic. A plurality of melt distributor channels are in fluid communication with the orifice and each of the plurality of melt distributor channels have substantially the same length and cross-sectional volume. A plurality of injection tips terminates each of the melt distributor channels. A channel passes through each of the injection tips, a first end which is in fluid communication with a corresponding one of the melt distributor channels and a second end of which is for connecting to a corresponding injection port of a corresponding mold. Molten plastic flows at substantially equal flow rates and timing through each of the melt distributor channels and through each of the injection tips, entering each of the two injection ports of each mold at substantially the same timing, flow rate, and temperature.

Disclosed is a device for distributing thermoplastic material to a preform molding machine, the preforms being used for manufacturing containers; the device includes at least a stationary part and a movable part, a seal that has a first sealing surface and a second sealing surface which are axially separated from each other by a gap inside which some of the thermoplastic material flows, a channel for radially constraining the thermoplastic material, and an associated cooler for radially obtaining a temperature gradient in order to increase the viscosity of the thermoplastic material located between the sealing surfaces.

Disclosed is a device for distributing thermoplastic material to a preform molding machine, the preforms being used for manufacturing containers; the device includes at least a stationary part and a movable part, a seal that has a first sealing surface and a second sealing surface which are axially separated from each other by a gap inside which some of the thermoplastic material flows, a channel for radially constraining the thermoplastic material, and an associated cooler for radially obtaining a temperature gradient in order to increase the viscosity of the thermoplastic material located between the sealing surfaces.