Injection screw questions answered

Questions

FAQs

Do you rebuild injection screws or only extruder screws?

Both. This site covers injection moulding screws. For extruder screws, see extruder-screws.co.uk.

What size range?

We manufacture new screws from 20 mm to 180 mm diameter, at any length. We refurbish screws from 50 mm to 250 mm diameter.

My shots are inconsistent. Is it the screw?

It could be the screw, the check ring or the barrel. The only way to know is to pull the screw, let everything cool and measure it.

Can you check the screw without removing it?

No. The screw has to be out and cold, and the barrel cold and clean, before wear can be measured.

Is it cheaper to refurbish?

Usually, yes. A new screw makes more sense once the root has worn on a smaller screw.

How long will it take?

A refurb typically takes 2–4 weeks and a new screw 7–9 weeks.

Do you supply tips, check rings and nozzles?

Yes. We manufacture complete tip assemblies or separate tips, check rings and seats, including ball-check types, and we refurbish worn tip assemblies. We also manufacture nozzles and barrel end caps.

The front of my barrel is worn. Do I need a new barrel?

Often not. A short re-sleeve on the worn front section is usually the best fix.