Common Problems in Plastic Extrusion Moulding (And How to Fix Them)

Plastic extrusion moulding is widely used across industries—from construction materials to consumer goods. However, even the best equipment and moulds can run into problems during production. For manufacturers and buyers, knowing these common problems in extrusion moulds and how to fix them is critical. It not only improves production efficiency but also saves cost in the long run. Let’s break it down step by step.

1. Uneven Product Surface

One of the most frequent issues is surface roughness or uneven finish. This can happen due to poor mould polishing, incorrect temperature control, or contamination inside the die.

How to fix it:

• Make sure the mould surface is polished properly.

• Keep extrusion temperature stable.

• Clean the mould regularly to avoid material residue.

2. Inconsistent Dimensions

Customers often complain when extruded products don’t meet dimensional accuracy. This happens when the mould is not aligned or the pressure inside is unstable.

Solution:

• Check mould alignment during setup.

• Ensure the extrusion machine maintains steady pressure.

• Use high-precision moulds with strict tolerance control.

3. Poor Adhesion in Co-Extrusion Products

PVC seal co-extrusion dies are commonly used for window and door seals. But sometimes the layers fail to bond properly.

Solution:

• Adjust processing temperature to match materials.

• Use moulds designed specifically for co-extrusion.

• Consider a custom extrusion mould from a reliable China manufacturer, as they optimize bonding strength.

4. Short Mould Life

Over time, moulds wear out. Frequent replacement increases costs, which frustrates many buyers.

Solution:

• Choose moulds made of high-quality steel.

• Apply anti-corrosion coating.

• Invest in maintenance rather than waiting until the mould fails.

5. Production Downtime

Sometimes, mould changes or breakdowns cause unnecessary downtime. This is costly for factories that rely on efficiency.

Solution:

• Plan preventive maintenance.

• Work with suppliers who provide fast after-sales service.

• Choose extrusion moulds that are easier to clean and adjust.

Yes, extrusion moulding comes with challenges, but they can be solved with the right knowledge and the right partner. At the end of the day, choosing a professional China mould factory with more than 20 years of experience can save you a lot of trouble. Don’t just think of it as buying a product—it’s about securing reliable production.