What’s The Nozzle Of a Moulding Plastic Machine?

What’s The Nozzle Of a Moulding Plastic Machine

The nozzle is the front part of the screw and barrel of moulding plastic machine, it is necessary and important of the plastic injection machine.

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Moulding plastic machine nozzle function

While injection molding machine equipment does charging, establishes back-pressure, drives out the air, prevents melt material flow out, and improves the plasticizing ability and measurement accuracy.

During injection, touch the main sprue of the mold keep a good connection and form a close passage to prevent the melt material flow out under high pressure.

When the machine does injection, helps establish melt pressure, increase shear stress, increase shearing speed and temperature rise, and enhance mixing effect and homogenization. The nozzle also helps the temperature regulation, heat preservation, and material breakage.

Reduce the viscoelastic effect and eddy current loss of melt material at the inlet and outlet to stabilize its flow. While a horizontal injection molding machine does pressure-holding, it helps feed the material into the molded product. while cooling, it helps increase return resistance and reduce or prevent the melt material from flowing back from the mold cavity.

What is the hole diameter of the molding machine nozzle?

Generally, different sizes of injection molding machines, have different nozzle hole diameters. For example, for a small plastic injection molding machine, it has 2.5mm,3mm,4mm; for a big machine, it will be 6mm, 8mm,10mm, etc.

Injection Machine Nozzle Setting

below is the path to enter the screen of nozzle setting of servo motor automatic plastic molding machine.

molding machine nozzle setting


Set here the hydraulic pressure for Nozzle advance and retraction.


Set up suitable nozzle high speed and slow speed action, when the nozzle moves at a high speed to the final position, the nozzle forward will change to a slow speed movement until the slow speed timing is done.


The nozzle moving forward to the final position will change the speed from high speed to low speed, considering changing to slow speed before 20mm of the final position to allow the shut off to reach the mold platen by using the very important rotation power. It is because if the position setting is not accurate, the moulding plastic machine nozzle will not decrease the speed, and the mold platen and shut off will be damaged because of the strength while they contact.


Nozzle position setting of injection molding machine, the forward the figure is the bigger the figure will be. If the nozzle distract position is 0, the nozzle will distract to the end.

Nozzle distraction mode:

Not necessary= means the nozzle is not operating

After the charge= Nozzle distracts after the charge ends

Before mold opens= Nozzle distracts before the mold opens (means the cooling time has reached)

After the injection= moulding plastic machine nozzle distracts after the injection.

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Frequently Asked Questions

Daoben has the SOP (Standard Operation Procedure) and all the production steps must follow up this SOP. Every machine needs at least automatic running over 72 hours and must be inspected carefully before shipment.

Actually, the delivery time of the machines is depended on the machine options. Normally, the delivery time of a standard machine could be within 1-2 months.

12 months warranty after shipment for mechanical parts, hydraulic parts, and electric components excluding the screw and barrel 6 months (not including use for recycled material or reclaimed material).

Yes, Daoben will provide one set of standard spare parts to the customer including a heater, filter, screw head, screw washer, checking ring, sealings, etc.

Surely, we have experienced technical engineers for oversea service, they would help you install machines and support training to workers also. Currently, we provide visits online by video call for COVID-19.

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