Tablet Press Troubleshooting: Causes & Fixes

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Problems on this page:

Tablet weight variation Capping or lamination Sticking or picking Hardness out of range Thickness variation Black specks in tablets Punches tight or binding Chipped or cracked edges

Tablet weight variation

Hits OEE: Quality

Symptoms: Weights drift outside limits, rejects at the checkweigher, content uniformity risk.

Inconsistent die fill

Check the feeder, paddle speed and powder flow; improve granule flowability.

Worn punches or dies

Inspect and replace worn tooling; verify tip and die wear.

Press speed too high for the powder

Reduce turret speed; balance feed to dwell time.

Prevention: Granule flow control, tooling inspection, validated speed.

Capping or lamination

Hits OEE: Quality

Symptoms: Tablet caps split off or peels in layers, failed friability.

Trapped air in the die

Add pre-compression; slow the press; reduce fill depth.

Over-compression or wrong force

Tune main and pre-compression force to spec.

Poor granule binding or moisture

Adjust the formulation/moisture; check the granulation.

Prevention: Pre-compression use, force control, granulation quality.

Sticking or picking

Hits OEE: Quality

Symptoms: Powder sticks to punch faces, surface defects, embossing fills in.

Insufficient lubrication

Adjust lubricant level and blend time.

High moisture or tacky formulation

Control moisture; review the formulation.

Worn or damaged punch tips

Polish or replace the affected punches.

Prevention: Lubrication control, moisture control, punch maintenance.

Hardness out of range

Hits OEE: Quality

Symptoms: Tablets come out too soft and friable, or too hard to dissolve as specified.

Compression force drifting

Check the force control and the pre-compression settings.

Granule moisture changed

Check the moisture at the press against the specification.

Punch working lengths vary

Measure the punch set and replace punches outside tolerance.

Press speed changed

Confirm force and hardness at the new speed under change control.

Prevention: Hardness checks at the frequency the batch record sets.

Thickness variation

Hits OEE: Quality

Symptoms: Tablet thickness varies within a batch.

Punch working lengths vary

Measure and match the punch set.

Weight variation feeding through

Fix the die fill first.

Worn cams or tracks

Inspect the cams and tracks.

Worn pressure rolls

Check the pressure rolls for wear and play.

Prevention: Punch inspections at every set change.

Black specks in tablets

Hits OEE: Quality

Symptoms: Dark specks found in tablets at inspection.

Lubricant from the punches or turret reaching the product

Wipe away excess lubricant and check the dust cups and seals.

Wear particles from tight punches

Clean and lubricate the punch guides as the maker describes.

Weak dust extraction

Check the extraction at the turret.

Residue from the last product

Check the cleaning of the hopper, feeder and turret.

Prevention: Speck findings traced to their source and recorded.

Punches tight or binding

Hits OEE: Availability

Symptoms: Punches move stiffly, squeal, and the turret runs warm.

Powder in the punch guides

Clean the guides.

Wrong or too little lubricant

Use the maker's lubricant at the right amount.

Damaged punch barrels

Replace damaged punches.

Weak dust extraction

Check the extraction.

Prevention: Punch and guide cleaning at every changeover.

Chipped or cracked edges

Hits OEE: Quality

Symptoms: Tablets show chipped edges or cracks.

Worn punch tips

Inspect, polish or replace the punches.

High ejection force

Check the ejection cam and the formulation lubricant.

Take-off scraper set wrong

Set the scraper.

Drops and impacts after the press

Reduce drop heights on chutes and conveyors.

Prevention: Tooling inspection logs kept for each punch set.

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

Related equipment guides: autoclave · blister pack machine · homogeniser · fluid bed dryer · tablet coater · IBC blender · high shear granulator · tablet counter

Stop the same fault coming back

Recurring tablet 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.

Book a Fabrico demo

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