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Needle-Type Nozzle Classification and Characteristics

According to the form of needle-type nozzle valve needle movement can be divided into spring-loaded needle nozzles, pneumatic or hydraulic valve stem type, cylinder or cylinder-type needle nozzles, nozzle needle chute, hydraulic or pneumatic valve rack and pinion drive nozzle.

Spring-loaded needle nozzle is characterized by simple structure, easy maintenance, with the resin pressure nozzle opening and closing of the needle valve, do not make the injection machineSpecial settings. The disadvantage is that the needle valve opening and closing of the melt pressure lossy, the need to pay attention to the design of resin leakage along the needle axis and needle length and pin locking force, etc.

Pneumatic or hydraulic valve stem type which can be freely set the gate opening and closing time, and can be pre-shut-off valve needle until shunt resin injection pressure is equal to the pressure, and can be opened and closed sequential control valve needle. But the cylinders or hydraulic cylinders to be placed on the outside of the mold, die size limits and affected.

Type nozzle needle cylinder or cylinders can be freely set the gate opening and closing time, and can be pre-shut-off valve needle until shunt resin injection pressure is equal to the pressure, you can give the signal sequence control opening and closing of the valve needle through the presses.

Chute nozzle needle is driven cylinder rod slides on the valve needle chute, which led to the valve needle moves up and down to control the opening and closing of the nozzle. It features simple structure, reliable operation of the action; but the installation is more complex, but also easy to adjust the stroke of the valve needle movement.

Hydraulic or pneumatic drive pinion gear driven valve nozzle rack rod action by action, leaving the valve needle movement. This kind of structure movement and reliability, but the structure is complex and difficult to install, to be installed outside the mold hydraulic, pneumatic cylinders and worm, the worm device.

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