INJECTION MOULDING SCREW TIP ASSEMBLY DESIGNS

Below are some of the common options for screw tip assembly designs (see also: barrel designs and screw designs)

3 Piece (Castellated) Screw Tip Assembly

2 Flight Screw Tip Assembly

Standard 3 Piece Screw Tip Assembly

The Standard general purpose screw has successfully proved itself in processing many of the most common polymers.

 

Fitted as standard to the majority of newly delivered moulding machines,we can also offer this style optimsed for your application.

Used by some manufacturers as standard, the three piece screw tip assembly with a castellated check ring can offer a more precise shut off and can reduce anti-rotational wear.

 

When a large throughput with a fast shut off is required, a two flight high discharge screw tip assembly can offer a solution.

PVC Smear Tip With Flights

Ball Check Valve

PVC Smear Tip (Smooth)

For use with rigid PVC materials. Some PVC profile screws as supplied with a smooth nose (point) others have a detachable PVC tip.

As a further enhancement to the standard PVC tip we can produce one with feeding and metering flights for accurate a filling of the mould.

This design of ball check valve offers a high melt flow with a fast action for fast cycling machines.  Ball check valves offer a constant repeatable pack size.

 

Ball check valves are recommended to be used with low viscosity (low shear) materials.

Ball Check Valve (Angled Actuation)

Poppet Check Valve

Ball Check Valves With Metering Profile

Designed with a fast acting poppet,  this ball check valve offers a high melt flow with a fast action for fast cycling machines.  Ball check valves offer a constant repeatable pack size.

 

Ball check valves are recommended to be used with low viscosity (low shear) materials.

Side acting ball check valves give you excellent shot control with fast purging and final metering of the melt flow.  Ball check valves offer a constant repeatable pack size.

 

Ball check valves are recommended to be used with low viscosity (low shear) materials.

This Tip assembly is designed to give a high melt flow with a fast action for fast cycling machines, but also the angled nose cone allows for accurate metering of the melt flow.  Ball check valves offer a constant repeatable pack size.

 

Ball check valves are recommended to be used with low viscosity (low shear) materials.

Lawson Principle None Return Valve

This style of screw tip is normally used on Stork Lawson machines, and is designed for high throughput using a sealing ring blocked by forward pins.

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