Machine bolt shut-off nozzle type BHP
- pneumatic / hydraulic actuation
The pneumatically or hydraulically actuated machine bolt shut-off nozzles type BHP are used in processing of thermoplastics.
In this nozzle’s favour are: 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 throughgoing 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Prevents: • Air pockets during screw retraction • Material leakage when dosing with a withdrawn injection unit • Material leakage while vertically injecting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