An injection molding nozzle system for delivering molten material from a manifold to a nozzle is disclosed. The manifold and nozzle are disposed within pocket of a manifold plate. The nozzle is secured to a melt-transfer bushing disposed within the manifold via a collar. The collar is secured to the bushing such that it is centered about the axis of the outlet of the bushing. A support ring supports the nozzle within the pocket such that the nozzle is centered about the axis of the pocket. In a cold state, the outlet of the bushing and the inlet of the nozzle are misaligned. In operation, thermal expansion of the components bring the outlet of the bushing and the nozzle into alignment. The melt-transfer bushing and the connection of the nozzle to the manifold, via the releasable connection between the collar and the bushing facilitates manufacture and assembly of the system.

A cavity includes a first cavity portion, and a second cavity portion that is formed between the first cavity portion and a runner and that corresponds to a baseboard. There is adopted a configuration in which a foamed admixture is supplied to the first cavity portion via the second cavity portion upon being supplied to the cavity via the runner. A collision portion with which the foamed admixture supplied to the cavity can collide before reaching the first cavity portion is formed at the second cavity portion.

Injection unit for injection molding of plastic material including: an injection nozzle; a closure pin; and a guide and cooling assembly, interposed between the back driving plate and the hot distribution plate, in turn comprising: a guide and seal element for guiding the axial motion of the closure pin; a cooling ring; and pressure means configured to press the cooling ring directly and against the back driving plate; wherein the guide and seal element is slidably coupled, at an upper end, with a central hole of the cooling ring, and is fixed integrally, at the other end, to the hot distribution plate; and the cooling ring is able to slide laterally with respect to the back driving plate to recover the differences in thermal expansion between the hot distribution plate and the back driving plate and to transmit heat from the guide and seal element towards the back driving plate.

A cavity includes a first cavity portion, and a second cavity portion that is formed between the first cavity portion and a runner and that corresponds to a baseboard. There is adopted a configuration in which a foamed admixture is supplied to the first cavity portion via the second cavity portion upon being supplied to the cavity via the runner. A collision portion with which the foamed admixture supplied to the cavity can collide before reaching the first cavity portion is formed at the second cavity portion.

Injection unit for injection molding of plastic material including: an injection nozzle; a closure pin; and a guide and cooling assembly, interposed between the back driving plate and the hot distribution plate, in turn comprising: a guide and seal element for guiding the axial motion of the closure pin; a cooling ring; and pressure means configured to press the cooling ring directly and against the back driving plate; wherein the guide and seal element is slidably coupled, at an upper end, with a central hole of the cooling ring, and is fixed integrally, at the other end, to the hot distribution plate; and the cooling ring is able to slide laterally with respect to the back driving plate to recover the differences in thermal expansion between the hot distribution plate and the back driving plate and to transmit heat from the guide and seal element towards the back driving plate.

The disclosure relates to an injection nozzle (1) suitable for injection molding of thermoplastic materials, in particular polyolefin materials, the injection nozzle (1) comprising a housing (2) comprising a sleeve-shaped rear section (3) and a thereto coaxially arranged sleeve-shaped front section (4) surrounding a central passage (5) extending in an axial direction (z) forming part of a melt channel (6). In the central passage (5) a needle (7) is arranged movable in the axial direction (z) between a retracted open position and an extended closed position in which a gate (8) at a tip (9) of the front section (4) is closed by a front end (10) of the needle (7) in a sealing manner. A spacer (11) is arranged between the rear section (3) and the front section (4) defining a total length of the housing (2) in the axial direction (z).

A unitary monolithically formed hot-runner apparatus having at least a manifold containment structure, a hot-runner manifold, at least one nozzle, and one or more spacers. In some embodiments, the manifold containment structure, hot-runner manifold, nozzle(s), and spacer(s) may be multi-material apparatuses of unitary monolithic construction. In other embodiments, a thermal expansion accommodation portion is provided for each nozzle to accommodate thermal growth. Each spacer may be formed of a material having a lower thermal conductivity than the materials of the hot-runner manifold and manifold containment structure and may be made to include a discontinuity to allow for thermal expansion.

An injection molding nozzle system for delivering molten material from a manifold to a nozzle is disclosed. The manifold and nozzle are disposed within pocket of a manifold plate. The nozzle is secured to a melt-transfer bushing disposed within the manifold via a collar. The collar is secured to the bushing such that it is centered about the axis of the outlet of the bushing. A support ring supports the nozzle within the pocket such that the nozzle is centered about the axis of the pocket. In a cold state, the outlet of the bushing and the inlet of the nozzle are misaligned. In operation, thermal expansion of the components bring the outlet of the bushing and the nozzle into alignment. The melt-transfer bushing and the connection of the nozzle to the manifold, via the releasable connection between the collar and the bushing facilitates manufacture and assembly of the system.

A drop-in hot runner system includes a first runner component having a first channel aperture extending into a first runner component sliding surface, and a second runner component having a second channel aperture extending into a second runner component sliding surface. A depressible protrusion is associated with the first runner component, and a receiver is associated with the second runner component. The depressible protrusion and the receiver are positioned such that when the first runner component and the second runner component are coupled together along the first and second runner component sliding surfaces the depressible protrusion is received in the receiver, and the first and second channel apertures are misaligned.