Multi-cavity needle valve applications for closure cap and packaging market

HASCO has developed its new Z3145/ ... Valve Shot line of hot runner nozzles especially for demanding applications in the closure cap and packaging industry. When designing the new nozzle range, particular attention has been given to the specific needs of processors in this field.

The new HASCO needle valve system allows optimum process control. Balanced filling of all the cavities is achieved 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 life of the gate thanks to the needle guidance being close to the gate with minimum needle stroke. To meet the industry requirement of good color change capability, the new nozzle line has a specially-designed gate bubble geometry.

The Valve Shot is best suited for processing polyolefins and styrene in a shot weight range of 5g to 25g. With a nozzle front sealing diameter of only 10mm, body diameter of 16.5mm and finely scaled nozzle lengths of 80mm to 140mm, it is possible to work with small cavity centers and also reach difficult gating positions on the article.

Maintenance-friendly

This line of nozzle is also particularly maintenance-friendly because of the interchangeable thermocouple and heater. Through the flexible position of the heating outlet, the nozzle components can be changed after pulling the mold plate apart on the machine. Dismantling the mold is unnecessary, thus 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.

The nozzles are supplied as standard in combination with the pneumatic needle valves Z10750/.... Alternatively, other HASCO drive systems – such as the electromagnetic drive with HASCO Z1081/... can be implemented and drive media deployed.