Common Faults and Troubleshooting Methods for Rotary Tablet Press from the Structural Point of View

Make the investigation safe and traceable

This reference helps organise an investigation; it is not a repair instruction or permission to work on moving equipment. Before access, authorised personnel must isolate the press and relevant energy sources according to the manufacturer’s instructions and the site’s lockout procedure. Confirm the safe state before touching tooling, guides or rollers. Never bypass guards or interlocks to observe a fault.

Stop production when there is unexplained impact noise, a suspected broken tool, a loose die or another condition that could damage equipment or contaminate product. Segregate affected material according to the site procedure. Preserve suspect tools and samples rather than immediately polishing, replacing or mixing them with good parts.

Use the symptom to narrow the investigation

Symptoms overlap. A weight problem may originate in powder preparation rather than a damaged machine, while a station-specific defect can reveal a tooling issue hidden by average batch results. Use the table to prioritise checks, not to declare a cause without evidence.

Turret, die retention and tooling alignment

The turret locates the punches and dies and carries them through the compression cycle. Wear, damage or poor retention can affect alignment, filling and movement. Record whether the symptom follows one station, a particular tooling set or the turret as a whole. Check identification and maintenance records before concluding that a major component requires replacement.

Qualified maintenance should assess the relevant dimensions, retention components and fits against the approved drawings and manufacturer’s limits. Do not use improvised reaming, grinding or adjustments to recover alignment. A modification that appears to remove friction may change critical geometry or hide a more serious defect. Return the equipment to service only through the site’s approved release process.

Cam tracks, guides and compression rollers

Cam tracks guide punch movement; compression rollers apply the force that forms the tablet. Wear, damaged surfaces, incorrect setup or unsuitable lubrication can disturb motion and loading. Observations such as when in the cycle a noise occurs and whether a fault changes with speed can help a service engineer locate the affected area.

Review lubrication and inspection history with the exact model manual. Different locations can require different lubricants, quantities and intervals. Do not add oil indiscriminately, particularly near product-contact areas. Damaged rollers, bearings, shafts or guide components require assessment by trained personnel; increasing compression force is not a corrective action for a mechanical fault.

Filling, tablet quality and ejection

For general weight variation, examine material supply, flow behaviour, fines, feeder condition and the time available for filling. For sticking or picking, review the formulation, moisture condition, tooling surface and embossing together. For capping or lamination, investigate the material and compression profile rather than assuming that the turret is defective.

Ejection problems can involve die condition, lubrication, product behaviour and the ejection arrangement. A defect confined to one station suggests a different investigation from a similar defect across every station. Preserve representative samples and identify the station where practical and safe. Product testing should follow the approved quality procedures; appearance alone cannot establish batch acceptability.

Document the correction and verify the result

Record the model and serial number, affected station, tooling identification, material lot, operating speed, fill and compression settings, alarms and defect frequency. Include photographs taken only when access is safe. This gives Tianfeng or the maintenance team a much stronger starting point than a description such as “the machine does not press well.”

After approved corrective work, verify the setup, safety functions and product results under the site’s restart procedure. Change one justified variable at a time where practical and record the outcome. For process-related defects, also review the five factors affecting tablet quality. For mechanical questions, provide the exact model configuration and request model-specific service guidance.