Ampoule Filling Machine Troubleshooting: Causes & Fixes

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Problems on this page:

Fill volume out of tolerance Seal defects at the ampoule tip Glass breakage in the machine Particles found at inspection Nitrogen gassing not reaching target Environmental monitoring excursions Long format changes Printing or labelling errors on ampoules

Fill volume out of tolerance

Hits OEE: Quality

Symptoms: In-process checks find ampoules filled above or below the limit.

Dosing pump or piston not calibrated

Calibrate each dosing station by weight and record the result.

Air or gas bubbles in the product line

Check the product line for leaks and the buffer tank level.

Needle partly blocked or bent

Inspect the filling needles and replace damaged ones.

Product temperature or viscosity changed

Check the product temperature against the validated range.

Prevention: Fill weights checked per station at the interval the batch record sets.

Seal defects at the ampoule tip

Hits OEE: Quality

Symptoms: Inspection finds open tips, thin glass, bubbles or burnt seals.

Burner flame settings wrong

Check the gas and oxygen flows to the sealing burners against the validated settings.

Ampoule rotation during sealing uneven

Check the rollers that turn the ampoule in the flame.

Product on the neck before sealing

Check the needle position and the drip after filling.

Burner nozzles dirty or worn

Clean or replace the burner nozzles.

Prevention: Seal integrity tested on samples as the batch record sets.

Glass breakage in the machine

Hits OEE: Availability

Symptoms: Ampoules break in the infeed, transport or sealing area, and the line stops for clean-up.

Star wheels or guides set for the wrong format

Check the format parts against the ampoule size.

Ampoules jammed by tight infeed pressure

Check the infeed pressure and the tray unloading.

Glass quality defects

Check the incoming ampoules for cracks and dimensions.

Thermal shock from the tunnel or burner

Check the temperature of the ampoules entering the sealing station.

Prevention: Breakages recorded by position, and glass cleared using the line clearance procedure.

Particles found at inspection

Hits OEE: Quality

Symptoms: Visual or automatic inspection rejects ampoules for particles.

Glass particles from the opening or sealing step

Check the sealing flame and ampoule handling for chipping.

Ampoules not clean after washing

Check the washer water quality, pressure and nozzles.

Fibres or particles in the filling zone

Check the airflow and the cleanliness of the filling zone.

Product filter damaged

Check the integrity test record of the product filter.

Prevention: Inspection rejects trended by type for each batch.

Nitrogen gassing not reaching target

Hits OEE: Quality

Symptoms: Headspace oxygen in the ampoules is above the limit.

Nitrogen flow or purity low

Check the nitrogen supply, filter and flow at each gassing needle.

Gassing needle position wrong

Check the needle depth and timing.

Time between gassing and sealing too long

Check the machine speed and the transfer to the sealing station.

Leaking seals letting air in

Work through the seal causes and test seal integrity.

Prevention: Headspace oxygen measured on samples each batch.

Environmental monitoring excursions

Hits OEE: Quality

Symptoms: Particle counts or microbial results in the filling zone exceed the alert or action limits.

Airflow pattern disturbed by people or equipment

Review interventions and movements in the filling zone.

Filter leak in the laminar flow unit

Have the filters integrity tested.

Cleaning and disinfection gaps

Check the cleaning records and the disinfectant rotation.

Door or barrier opened during filling

Check the barrier and door records.

Prevention: Environmental results reviewed for every batch.

Long format changes

Hits OEE: Performance

Symptoms: Changing to another ampoule size takes long, and the line clearance adds more time.

Format parts not prepared and cleaned in advance

Clean, sterilise and stage the next format parts before the batch ends.

Adjustments set by trial

Use marked or fixed positions for each format.

No written changeover sequence

Write the sequence and train each operator.

Line clearance done twice

Combine the line clearance with the changeover checklist.

Prevention: Format change time recorded.

Printing or labelling errors on ampoules

Hits OEE: Quality

Symptoms: Ampoules leave with missing, smudged or wrong print or labels.

Printer or labeller not synchronised

Check the trigger and timing against the ampoule transport.

Ink or label not suited to glass

Check the ink or label specification for glass.

Ampoules wet or warm at printing

Check the ampoule condition before printing.

Vision check not set up for the batch

Check the vision system is taught the current batch data.

Prevention: Print checked by vision and on samples each batch.

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

Related equipment guides: aseptic vial filler · autoclave · vision inspection · freeze dryer · labelling machine

Stop the same fault coming back

Recurring ampoule filling machine 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