The range of spring actuated needle shut-off nozzles has been modified by the revised SHP (Spring High Performance) nozzle. The revision concept is shaped by a new spring package which is kept fully away from the melt stream. The functionality of the spring is from outside controllable and because of this the general handling of the nozzle is improved.
Through the reduced spring rate can the material load be reduced and as a result of this the system can be kept open with less force. Leakage removal is taken into consideration by means of a larger cross section. The design of the nozzle corresponds to today’s injection molding requirements. Problem-free functionality at 3,000 bar injection pressure and an operating temperature of up to 400°C is guaranteed. A modular construction was realized, comparable with the pneumatic or hydraulic actuated type HP nozzle.
