Maintenance and spare parts
Use fault history to improve inspection, parts stock and preventive tasks.
Fault-finding guide
Packaging-line faults often appear at a different station from their cause. A repeatable method separates product, component, setup, transfer, controls and machine condition before settings are changed. Work must always follow the site’s safe isolation and competence requirements.
Make the equipment safe using the approved stop and isolation procedure. Segregate affected product and record the exact alarm, machine mode, product, format, recipe, time and preceding event. Photograph the pack and machine state where permitted. Ask what changed: product batch, container supplier, closure, label roll, film, cleaning, maintenance, operator, environment, speed or upstream process.
Confirm the symptom with a small controlled observation if safe and authorised. Avoid changing several parameters, replacing multiple parts or repeatedly resetting the line; that destroys evidence and can create a second fault.
| Observed symptom | Areas to check | Evidence to collect |
|---|---|---|
| Variable fill or dripping | Product supply, temperature, aeration, valves, tubing, pump or cylinder condition, nozzle, recipe, container detect and measurement method. | Product batch and temperature, settings, sample sequence, weight/volume method and photographs of the nozzle/pack. |
| Cross-threaded, loose or damaged caps | Cap orientation, placement, neck finish, container support, head alignment, torque method, cap/neck variation and product on the finish. | Cap and bottle batches, applied/removal test method, feed faults and rejected assemblies. |
| Skewed, wrinkled or missing labels | Product spacing and stability, label roll, web tension, sensor, peel plate, wipe pressure, container surface and guide settings. | Roll reference, winding direction, pack dimensions, setup record and finished samples. |
| Conveyor jams or tipping | Transfer gap, height, guide alignment, speed transition, product base, queue pressure, fallen pack detection and downstream blockage. | Location, product condition, speed, buffer state and video of normal/fault approach where safe. |
| Poor or intermittent seal | Material, contamination, heat, pressure, dwell, alignment, cooling, product presentation and seal-jaw condition. | Film/pouch batch, settings, seal samples, product in seal area and test method. |
| Unreadable or wrong code | Data source, recipe, substrate, print head distance, ink/ribbon, trigger timing, encoder, cleaning and verification logic. | Expected data, printed sample, printer status, line speed and inspection result. |
| Repeated sensor fault | Target position, contrast, reflection, contamination, alignment, wiring, timing, recipe and component tolerance. | Sensor state, target samples, environment and whether the fault follows a format or batch. |
Compare the current product, container, cap, label or film with an approved retained sample. Measure the relevant dimension or property rather than relying on visual similarity. Packaging components can change between batches, cavities or suppliers; product viscosity and powder bulk condition can change with temperature and handling. If the fault follows a material batch, isolate and review it before compensating with machine settings.
Verify that the selected recipe matches the physical parts and format. Check guides, sensors, nozzle or head position, feeder parts, label web path, film forming set and approved reference settings. Look for a missing spacer, reversed part, loose fastener or adjustment made during cleaning.
Use one controlled correction at a time and record the result. If the correct setting drifts repeatedly, investigate wear, looseness, contamination or component variation rather than simply resetting it each shift.
A downstream jam can starve or block several machines and generate misleading alarms. Follow the product flow backward and forward from the first abnormal event. Check ready, blocked, starved and fault signals, accumulation state, product pitch and restart surge. Confirm that sensors are seeing the intended product and that the product remains associated with any inspection result through stops and gaps.
Check air pressure at the machine during the fault, electrical supply indications, product feed pressure or level, extraction and environmental conditions. Inspect approved wear points such as belts, seals, tubing, blades, heaters, bearings, guides and contact surfaces using the maintenance instructions. Do not substitute parts or bypass alarms without authorisation and competent assessment.
Escalate when the fault involves safeguarding, unexpected movement, electrical or pressure hazards, repeated product-quality failure, software changes, structural damage, unknown parameters or a condition outside the documented process. Preserve the evidence and provide the supplier with machine identification, fault history, settings, material references, photographs and controlled test results.
Use fault history to improve inspection, parts stock and preventive tasks.
Understand blocked, starved, timing and transfer interactions between machines.
Keep troubleshooting within approved modes, isolation and competence boundaries.
The current state is evidence. Multiple unrecorded changes can hide a material, mechanical or upstream cause and create new variation. Record the symptom and change one authorised variable at a time.
Record the product and component batch, recipe, machine state, environmental condition and preceding event. Look for patterns around replenishment, temperature, queue state, changeover or a particular cavity or roll section.
Escalate when the fault is safety-related, outside the documented procedure, needs software or protected-parameter changes, recurs after approved checks, or threatens product quality or equipment damage.
Retain and label them where safe and useful until the cause is understood. A failed part can reveal wear, contamination, damage or an incorrect replacement and supports accurate spares selection.
Record the verified root cause and update the relevant inspection, maintenance, supplier-control, setup, training or material specification. A reset without a preventive action does not close the fault.
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