A mobile phone case injection mold includes a first molding plate and a second molding plate to form a cavity corresponding to a mobile phone case to be manufactured, a first injection device to inject a first molten resin, a second injection device to inject a second molten resin, a first runner to guide the first molten resin, a second runner to guide the second molten resin and a mixing runner to simultaneously guide the first and second molten resins to mix the first and second molten resins, thereby producing a mobile phone case having a pattern formed by mixing the first and second molten resins.

A co-injection hot runner nozzle comprises an inner melt flow channel and an annular outer melt flow channel that surrounds the inner melt flow channel. The inner and outer melt flow channels have a first common source. The nozzle further comprises an annular intermediate melt flow channel disposed between the inner and outer melt flow channels. The annular intermediate melt flow channel is at least partly defined by a plurality of spiral grooves, each spiral groove having a respective inlet and defining a helical flow path. Lands between adjacent spiral grooves increase in clearance in a downstream direction. An annular axial flow path is defined over the lands. A plurality of feeder channels having a second common source is configured to supply melt to the plurality of inlets of the spiral grooves. The relationship of feeder channels to spiral grooves may be one-to-one. The inlets may be longitudinal channels.

A co-injection hot runner nozzle comprises an inner melt flow channel and an annular outer melt flow channel that surrounds the inner melt flow channel. The inner and outer melt flow channels have a first common source. The nozzle further comprises an annular intermediate melt flow channel disposed between the inner and outer melt flow channels. The annular intermediate melt flow channel is at least partly defined by a plurality of spiral grooves, each spiral groove having a respective inlet and defining a helical flow path. Lands between adjacent spiral grooves increase in clearance in a downstream direction. An annular axial flow path is defined over the lands. A plurality of feeder channels having a second common source is configured to supply melt to the plurality of inlets of the spiral grooves. The relationship of feeder channels to spiral grooves may be one-to-one. The inlets may be longitudinal channels.

A melt conditioner is provided. The melt conditioner includes a melt conditioning body having a plurality of melt conditioning channels. The plurality of melt conditioning channels are located upstream of at least one manifold flow channel. Each melt conditioning channel is for conveying, in use a melt sub flow and is dimensioned to provide, in use, a conditioned melt sub flow having a thermal profile that accounts for a downstream geometry of the manifold flow channel.

A melt conditioner is provided. The melt conditioner includes a melt conditioning body having a plurality of melt conditioning channels. The plurality of melt conditioning channels are located upstream of at least one manifold flow channel. Each melt conditioning channel is for conveying, in use a melt sub flow and is dimensioned to provide, in use, a conditioned melt sub flow having a thermal profile that accounts for a downstream geometry of the manifold flow channel.

An injection molding apparatus includes an injector that obtains molten resin by melting resin, and injects the molten resin, a hot runner that is a flowing path of the molten resin, and a temperature rising part that is provided in a part of the hot runner, and increases a temperature of the molten resin to be higher than a melting temperature in the injector.

An injection molding apparatus includes an injector that obtains molten resin by melting resin, and injects the molten resin, a hot runner that is a flowing path of the molten resin, and a temperature rising part that is provided in a part of the hot runner, and increases a temperature of the molten resin to be higher than a melting temperature in the injector.

Providing an injection mold used for producing a molded resin article which is free of a weld line, irrespective of an injection pressure of a molten resin. At least one protrusion is provided in a first region of a ring runner portion defined by an inner circumferential surface of a first communication hole extending toward a cavity and an outer circumferential surface of a pin member disposed coaxially within the first communication hole, such that the protrusion projects from either one of these surfaces and an end face of the protrusion is held in contact with the other of these surfaces. The first region is a half of a circumference of the ring runner portion and is opposite to a circumferential position at which the first communication hole and a second communication hole extending perpendicularly to the first communication hole communicate with each other, with respect to the pin member.

Providing an injection mold used for producing a molded resin article which is free of a weld line, irrespective of an injection pressure of a molten resin. At least one protrusion is provided in a first region of a ring runner portion defined by an inner circumferential surface of a first communication hole extending toward a cavity and an outer circumferential surface of a pin member disposed coaxially within the first communication hole, such that the protrusion projects from either one of these surfaces and an end face of the protrusion is held in contact with the other of these surfaces. The first region is a half of a circumference of the ring runner portion and is opposite to a circumferential position at which the first communication hole and a second communication hole extending perpendicularly to the first communication hole communicate with each other, with respect to the pin member.

Disclosed herein is an injection mold for production of marbled moldings, including at least one hot runner, a cavity, an entry opening into the injection mold and an inlet into the cavity, where the hot runner has at least two ducts that are connected at a first end of each duct to the inlet into the cavity and at a second end of each duct to the entry opening into the injection mold, where the at least two ducts each at least partly form a spiral, and the at least two ducts are bounded by a one-piece component. Further disclosed herein is a process for producing the injection mold and a process for producing marbled moldings.