Injection nozzle BHP series

for melt90°needle shut-off

The pneumatically or hydraulically actuated machine bolt shut-off nozzles type BHP are used in processing of thermoplastics. With the BHP nozzle Herzog has designed a system which allows a single straight through melt flow channel. Therefore a much larger flow channel is possible which results in low pressure drop. With this single channel principle the so called “Memory effect” can be avoided. Purging and colour changes can be achieved in a very short time (similar to an open nozzle). Finds application in: high speed - high through-put applications, sheer sensitive materials, high viscosity materials. Ideal for packaging, automotive, white goods and medicinal. Operation: The assembly integrated actuator (pneumatically or hydraulically activated) controls a bolt which is located at a 90° angle to the melt stream, via a lever mechanism. The melt flow is therefore process independently separated. The bolt mechanism is constructed in such a way, that with over-pressure an automatic opening of the nozzle is ensured. In contrast to a needle shut-off system, the separation takes place further away from the mold. For some applications this may not be suitable due to potential residual material after the shut-off mechanism. Modules for filters, mixers and GAIM-applications broaden the range of shut-off nozzle products. Note: Values and measurements in this documentation refer to standard applications