Herzog Needle Type HP Shut Off Nozzle – Pneumatic / Hydraulic actuation
- Melt flow separation at nozzle orifice
- Operating pressure: 3000bar at 400°C
- Proven shut-off with high-speed units
- Robust, reliable separation
- Suitable for special applications
Description
Herzog Needle Type HP Shut Off Nozzle – Pneumatic / Hydraulic actuation
The pneumatically or hydraulically actuated machine needle shut-off nozzles type HP are used in processing of thermoplastics, principally with low viscosity materials such as: PA, PPS, PE, POM,PP.
Download (PDF) : Type HP Brochure
Download (PDF): Type HP Installations & Service Manual
In this nozzle’s favour are:
Cycle time reduction, shut-off at the nozzle orifice, withdrawal while dosing.
Finds application in:
Packaging, automobile and leisure industries, medicinal and electronic equipment.
Operation:
The assembly integrated actuator (pneumatically or hydraulically activated) controls a nozzle-axis positioned needle via a lever mechanism. The melt flow is therefore process dependently separated at the nozzle orifice. The needle mechanism is constructed in such a way, that with over-pressure an automatic opening of the nozzle is ensured.
Modules for filters, mixers and GAIM-applications complete the range of shut-off nozzle products.
Prevents:
- Filamentation
- Air pockets during screw retraction
- Material leakage when dosing with a withdrawn injection unit
- Material leakage while vertically injecting
Applicable for special applications such as:
- Physical foaming
- Pre-compressing the melt
- Hot-runner injection moulding (e.g.. containers, pots)
Supported process control:
Actuator piston position sensors (indicates if nozzle is ‘open’ or ‘closed’
Productivity factors:
- Controlled, clean shut-off of the melt stream
- Shorter cycle times – increase in productivity
- Increased process reliability and repeatability
- Usability with increased back pressure – improved homogenization
- Add-on capability (on tool side)
Options:
- Filter module
- Mixer
- GIT
- Process monitoring with piston position sensors on the actuator