How To Maintain Plastic Injection Mould?

✅ Inspect & clean the mould surface

Wipe the mould cavity and core with a clean cloth to remove dust, plastic residue, and oil.

Use a mild cleaning agent or mould cleaner for stubborn buildup.

✅ Check the ejection system

Ensure ejector pins and lifters move smoothly and are free from wear.

Apply lubrication to ejector pins to prevent sticking or friction damage.

✅ Monitor cooling channels & vents

Inspect water lines for blockages to ensure efficient cooling.

Check for moisture buildup or rust formation in cooling channels.

✅ Apply anti-rust protection (during idle time)

Weekly Maintenance

Every week, perform deeper maintenance to check for hidden issues.

✅ Tighten loose bolts & fasteners

Check clamps, guide pins, and bushings to ensure everything is secure.

Re-tighten loose screws or bolts to prevent misalignment.

✅ Inspect venting system

Clean mould vents to avoid burn marks or trapped gases affecting product quality.

Remove any carbon buildup caused by overheating.

✅ Lubricate moving parts

Apply grease to moving components such as sliders, ejector pins, and guide rails to prevent wear and reduce friction.

Once a month, conduct preventive maintenance to detect and fix early-stage damage.

✅ Check for wear & tear

Examine mould parting lines for signs of wear that might cause flashing (excess plastic on product edges).

Look for scratches or dents in the mold cavity that could affect the final product.

✅ Test cooling system efficiency

Flush cooling lines with anti-rust solutions or descaling agents to prevent blockages.

Ensure even cooling to prevent warping or inconsistent part quality.

✅ Polish the mold cavity (if needed)

Use fine sandpaper or a polishing compound to remove minor scratches and residue buildup.

Avoid aggressive polishing, which can change part dimensions.

For high-volume production moulds, schedule a full inspection and restoration every 6-12 months.

✅ Disassemble & deep clean

Take apart ejector pins, slides, and cooling lines for thorough cleaning.

Remove hardened plastic, debris, or rust buildup inside cavities and cooling channels.

✅ Check for cracks or damage

Use a microscope or dye penetrant test to detect small cracks or fatigue marks in the mold steel.

Repair damaged areas before they worsen.

✅ Replace worn-out components

Inspect and replace springs, ejector pins, and guide bushings if they show excessive wear.

Ensure hot runner nozzles (if applicable) are not clogged or leaking.

✅ Apply a protective coating (if storing for long periods)

Coat the mold with anti-rust oil or silicone-based protectant before storing it.

Store in a dry, temperature-controlled environment to prevent moisture damage.

If you have any question during mould maintenace, welcome to contact Shine (Email: shine@swymould.com or Phone: +86 15757668880), thanks!