Needle Gate Valves for Hot Runners


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HASCO (Fletcher, NC) has released Z3150/ ... Valve Gate Shot hot runner nozzles—a further development of the needle valve nozzle focused on demanding applications in the closure cap and packaging industry. When designing the new nozzle range, particular attention was given to the specific needs of processors in this industry.

The new HASCO needle valve system allows improved process control with guaranteed balanced filling of all the cavities by simultaneous opening of the valve pins after a certain amount of pressure has built up. Optimum transmission of the holding pressure is ensured, along with avoidance of stringing and drooling of melt from the gates.

The design of the nozzle also ensures long tool life thanks to the needle guidance being close to the gate and with minimal stroke.
An additional extraction thread for the needle guide, as well as extraction holes for the nozzle heating increase service friendliness.

The Valve Gate Shot is best suited for processing polyolefins and styrene in a shot weight range of 5 –25 g. With a nozzle front sealing diameter of only
10 mm, body diameter of 16.5 mm and finely scaled nozzle lengths of 80 to now 180 mm, it is possible to work with small cavity centres and also reach difficult gating positions on the article.

This line of nozzle is also particularly maintenance-friendly because of the interchangeable thermocouple and heater. The flexible position of the heating outlet has been taken a step further through a more stable connecting surface. This design makes it possible to also replace the heating unit after pulling the mould plate apart on the machine. Dismantling the mould is unnecessary, thus significantly shortening downtime and maintenance.

Additionally, the needle valve pin can be changed on the machine and adjusted from the rear without dismantling the hot runner. If necessary, individual cavities can be switched off and the relevant needle can be held in the closed position.