Products

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).

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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).

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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.

In this nozzle’s favour are: Cycle time reduction, shut-off at the nozzle orifice, dosing with retracted injection unit.

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The nozzle is opened directly from the injection pressure and closed again with spring force. A needle which moves axially in the needle shut-off nozzle is held in the closed position by the force of the spring. The nozzle orifice is normally closed.

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The spring actuated machine needle shut-off nozzles type SHP are used in processing of thermoplastics, principally with low viscosity materials such as: PA, PPS, PE, POM, PP

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The pneumatically controlled nozzle type NE has a needle shut-off mechanism which stops the melt stream directly at the mold interface. Rubber, liquid silicone rubber and other elastomers can be processed without fear of premature vulcanization due to the nozzle's integrated cooling system, which uniquely regulates temperature through the entire nozzle. The nozzle can also be fitted with an interchangeable diving tip for cold channel applications.

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With this specific valve different additives and auxiliary materials can be purposefully inoculated into the plastic at a defined place. Both solid and fluidic materials can be added.

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The regulated gas, usually nitrogen, is fed through bores in the mold to the injector and through this into the molded part. The back-gassing or gas pressure release goes through the same injector (type GKR) back to the gas feed.

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The injection procedure is introduced by the stroke of the plastifying screw. The plastic flows through the machine nozzle into the hot channel and on into the cavity. The needle shut-off in the hot runner system ensures that no mass flows uncontrolled into the cavity. When the machine nozzle is withdrawn, the existing material in the hot channel which is under pressure can cause some leakage. This leakage can be avoided with the implementation of the Herzog valve, which is constructed and works on the principle of a nonreturn valve. These valves can be built into every mold.

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The thermal system plays a considerable role in the optimal function of shut-off nozzles. Heating systems contain a heating unit, temperature sensors and the associated controllers.

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The thermal system plays a considerable role in the optimal function of shut-off nozzles. Heating systems contain a heating unit, temperature sensors and the associated controllers.

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