Tyre Curing Press Troubleshooting: Causes & Fixes

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Problems on this page:

Under-cured or over-cured tyres Bladder failures Mould venting problems Loader or unloader faults Steam or nitrogen leaks Press closing force faults Safety interlock problems Mould changes long

Under-cured or over-cured tyres

Hits OEE: Quality

Symptoms: Tyres fail cure checks, or show blisters or porosity.

Steam, hot water or nitrogen temperature or pressure off the recipe

Check the curing media temperature and pressure records for the cycle.

Mould temperature uneven

Check the platen and container temperatures around the mould.

Cure time changed

Compare the cure time with the approved recipe for the tyre.

Green tyre left waiting too long before curing

Check the time between building and curing.

Prevention: Cure records reviewed for every cycle.

Bladder failures

Hits OEE: Availability

Symptoms: Curing bladders leak or burst before their expected life.

Bladder life exceeded

Change bladders at the cycle count set for the bladder type.

Bladder lubricant not applied evenly

Check the inside paint or lubricant on the green tyre.

Sharp edges or debris in the mould

Inspect the mould for damage and debris.

Shaping pressure too high

Check the shaping pressure in the recipe.

Prevention: Bladder cycles recorded per press.

Mould venting problems

Hits OEE: Quality

Symptoms: Tyres show light areas, unfilled lettering or trapped air marks.

Mould vents blocked

Clean the vents with the method approved for the mould type.

Mould cleaning overdue

Clean moulds at the cycle count set for them.

Air trapped in the green tyre

Check the green tyre building for trapped air.

Shaping sequence not matched to the tyre

Check the shaping steps in the recipe.

Prevention: Tyres inspected after curing.

Loader or unloader faults

Hits OEE: Availability

Symptoms: The loader drops or misplaces green tyres, or the unloader does not pick up the cured tyre.

Loader chuck segments worn

Replace worn chuck parts.

Position sensors dirty or misaligned

Clean and align the loader sensors.

Air pressure low at the chuck

Check the air supply to the loader.

Loader timing changed

Check the loader timing against the press cycle.

Prevention: Loader faults recorded per press.

Steam or nitrogen leaks

Hits OEE: Availability

Symptoms: Curing media leak at the press, wasting energy and upsetting the cure.

Valve seals worn

Replace the valve seals during planned maintenance.

Hoses aged or damaged

Replace hoses on a schedule; hot steam hoses fail suddenly.

Rotary or swivel joints worn

Service the joints.

Gaskets on the centre mechanism leaking

Replace the gaskets.

Prevention: Leaks checked on a route.

Press closing force faults

Hits OEE: Availability

Symptoms: The press does not lock or does not reach its closing force.

Hydraulic pressure low

Check the hydraulic unit and pressure settings.

Mechanical linkage worn

Check the toggles, pins and bushes.

Force sensor fault

Check the sensor against a reference.

Mould height setting wrong

Check the mould height setting after a mould change.

Prevention: Closing force checked after every mould change.

Safety interlock problems

Hits OEE: Availability

Symptoms: The press stops on interlock faults or does not open.

Guards not closed

Close and check the guards.

Pressure interlock still detecting pressure

Check the pressure switch; the press must never open under pressure.

Light curtain fault

Clean and align the light curtain.

Interlock bypassed

Remove any bypass and find why it was fitted.

Prevention: Interlocks tested daily.

Mould changes long

Hits OEE: Performance

Symptoms: Mould changes take long and the press stands idle.

Mould not preheated

Preheat the next mould before the change.

Tools and fixings not staged

Stage the tools, bladder and fixings before the press stops.

No written sequence

Write the change sequence and time it.

Waiting for the crane

Plan the crane time for the change.

Prevention: Mould change time recorded.

Guidance only. Always follow lockout/tagout and your site's safe-work procedures, and verify against OEM manuals before acting.

Related equipment guides: compression moulding press · steam boiler · nitrogen generator · hydraulic system · industrial robot

Stop the same fault coming back

Recurring tyre curing press stops usually trace to a cause you cannot see by hand. The partner we recommend is Fabrico: it tracks OEE and downtime live from PLCs, IoT sensors or AI cameras; where cameras are fitted, the video of a stop sits next to its machine data so the cause can be reviewed; and a technician opens the work order from the stop in the same system. Data is hosted in the AWS EU region, and Fabrico and the company behind it hold ISO/IEC 27001, ISO/IEC 20000-1 and ISO 9001.

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Methods that cut recurring stops: the six big losses · root cause analysis · preventive vs predictive maintenance · TPM · SMED & changeover