Herzog Bolt Shut Type BHP Shut Off Nozzle – Pneumatic / Hydraulic actuation
- Excellent colour change properties
- Operating pressure: 3000bar at 400°C
- Proven shut-off with high-speed units
- Robust, reliable separation
- Compact, interchangeable design
Description
Herzog Bolt Shut Type BHP Shut Off Nozzle – Pneumatic / Hydraulic actuation
The pneumatically or hydraulically actuated machine bolt shut-off nozzles type BHP are used in processing of thermoplastics.
Download (PDF) : Type BHP Brochure
Download (PDF): Type BHP Installations & Service Manual
Benefits of using this nozzle:
Cycle time reduction, shut-off in the nozzle of the melt-stream while withdrawing or dosing. With the BHP nozzle Herzog has designed a system which allows a single through-going melt flow channel. Therefore a much bigger flow channel is possible and that is responsible for a reduced pressure drop. With this single channel principle the so called ‘Memory effect” can be avoided. With the single channel system a cleaning of the unit is done within very short time (similar to an open nozzle).
Finds application in:
Packaging, automobile and leisure industries, medicinal and electronic equipment.
Operation:
The assembly integrated actuator (pneumatically or hydraulically activated) controls a radial positioned bolt via a lever mechanism. The melt flow is therefore process dependently separated. The bolt mechanism is constructed in such a way, that with overpressure an automatic opening of the nozzle is ensured. In contrast to a needle shut-off system, the separation takes place further back. Because of this a longer bore exists between the nozzle orifice and the shut-off unit. For some applications this may not be suitable.
Modules for filters, mixers and GAIM-applications broaden the range of shut-off nozzle products.
Prevents:
- 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- Material leakage when dosing with a withdrawn injection unit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
Supported process control:
- Actuator piston position sensors (indicates if nozzle is ‘open’ or ‘closed’
Productivity factors:
- 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