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Herzog Shut-Off Nozzle

Advantages of Using Herzog® Shut-Off Nozzles

Productivity

Material saving by eliminating drooling, stringing, leakage
Increase reliability, reduction in waste parts
Reduction in cycle times
Process, environmental and safety aspects
Preventing process breakdowns while using filters
Homogenization improvement with increased back pressure and/or static mixers

Methods

Dosing with retracted injection units
High-speed machines, very short cycle times
Multi-component injection
Vertical injection process
Special applications (gas assisted injection molding, physical foaming, chemical foaming, melt pre-compression)
Filter and mixer applications

Bolt Shut-Off Nozzle - Type BHP

The BHP type shut-off nozzle is ideally suitable for processing at injection rates of up to 5’000 cm3 per second thanks to the straight-through, single channel design which provides optimal rheological conditions. Shearing of the material is also reduced due to direct melt flow and with the traditional, secure shut-off provided by herzog® nozzles you can reduce cycle times by dosing the next shot sooner while at the same time preventing drooling. Controlled by either pneumatic or hydraulic actuators, its carefully developed design allows for the easiest of installations and it can be adapted to any injection molding machine.
Max. injection rate: 5,000 cm3/s
Max. injection pressure: 3,000 bar at 400°C

Needle Shut-Off Nozzle - Type HP

The pneumatically or hydraulically controlled nozzle type HP (High Performance) has a precise needle shut-off mechanism which separates the melt stream directly at the mold interface. The HP nozzle is ideally suitable for closing against high pressures and remaining closed regardless of back pressure. Therefore it is adaptable with several different technologies such as; MuCell® and other physical or chemical foaming procedures as well as melt pre-compression.
Max. injection rate: 3,500 cm3/s
Max. injection pressure: 3,000 bar at 400°C

Needle Shut-Off Nozzle - Type A

The original needle shut-off nozzle from herzog® which has over the years enabled processors increase productivity. Strong, reliable and above all economical, it can be adapted to any machine type with the simplest of installations. The nozzle operation is melt pressure dependent. The axial aligned needle is held in the closed position by spring force. Once the injection pressure rises above 200 bar, it will overcome the spring force and open the nozzle.
Max. injection rate: 1,600 cm3/s
Max. injection pressure: 2,000 bar at 350°C

Needle Shut-Off Nozzle - Type SHP

The needle shut-off nozzle type SHP (Spring High Performance) is specially designed for processors who require an uncomplicated shut-off while operating at high temperatures and high pressures. This is enabled by placing the spring system outside of the melt stream. This compact design is effortless to install and can be expanded with a low pressure drop screen type filter.
Max. injection rate: 500 cm3/s
Max. injection pressure: 3,000 bar at 400°C

Needle Shut-Off Nozzle - Type NE

The NE type nozzle is specifically designed for use in elastomer processing. Rubber, liquid silicone rubber and other elastomers can be processed without fear of vulcanization due to the nozzle’s integrated cooling system which uniquely regulates temperature throughout the entire nozzle. It is manufactured from corrosion resistant materials. The pneumatically controlled nozzle has a needle shut-off which stops the melt stream directly at the mold interface.
Max. injection rate: 500 cm3/s
Max. injection pressure: 3,000 bar at temperature range –20°C to 110°C

Needle Shut-Off Nozzle - Type TSN

The spring actuated machine needle shut-off nozzles type TSN are used in the processing of thermoplastics, principally with low viscosity materials such as: PA, PPS, PE, POM, PP. A shut-off needle is positioned axially inside the nozzle. This is held in the closed position (default position) by spring force. The nozzle opens with injection pressure. Once the melt pressure which is exerted on the needle surface area rises above 200 bar, it overcomes the spring force and opens the nozzle. Once the pressure drops to below 80 bar, the spring force closes the nozzle at the orifice / mold interface.
Max. injection rate: 500 cm3/s
Max. injection pressure: 3,000 bar at temperature range –20°C to 110°C

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