Capsule Filler Troubleshooting: Causes & Fixes

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Problems on this page:

Fill weight variation out of limits Capsule splitting, dents or locking faults Empty or unseparated capsules getting through Capsule feeding faults Powder escaping around the dosing station Checkweigher rejects rising Machine out of time after a crash Capsules not ejecting cleanly

Fill weight variation out of limits

Hits OEE: Quality

Symptoms: In-process weight checks trend wide or bimodal, rejects rise, assay variability follows.

Powder flow inconsistency

Review blend flow properties and hopper level control; segregation or rat-holing upstream shows up as weight scatter.

Tamping pins worn or misadjusted

Inspect pins and springs, reset tamping depths per the setup card.

Dosing disc height wrong

Verify disc thickness and clearance for the recipe; renew worn discs.

Hopper level fluctuating

Keep powder level in the working band with level control; head pressure changes dosing density.

Prevention: Blend flow characterisation, tamping-station PM, setup verification with first-piece weights each batch.

Capsule splitting, dents or locking faults

Hits OEE: Quality

Symptoms: Split or telescoped capsules in the outfeed, dented caps, poor lock lengths at QC.

Shell moisture out of range

Store capsules at the maker's humidity spec; dry shells crack, damp shells dent and stick.

Rectification block wear

Inspect orientation components; mis-oriented capsules jam and split at joining.

Closing force or length misadjusted

Set the closing station to the shell maker's lock dimensions; verify with a gauge, not by eye.

Worn segment bores

Replace worn segments; sloppy bores misalign cap and body at closing.

Prevention: Shell storage humidity control, closing-length checks per batch, rectification and segment wear PM.

Empty or unseparated capsules getting through

Hits OEE: Performance

Symptoms: Empty capsules found downstream at the checkweigher, separation faults alarm, yield drops.

Weak vacuum separation

Check vacuum pump, filters and per-bore vacuum ports; blocked ports fail to pull bodies from caps.

Capsule lot quality

Audit incoming shells for dimensional variance and pre-locked units; quarantine bad lots.

Static in dry conditions

Control room humidity and add ionisation where shells cling and misfeed.

Worn separation components

Replace worn separation fingers and bushings that skip capsules under speed.

Prevention: Vacuum port cleaning cadence, incoming shell inspection, checkweigher reconciliation to catch drift early.

Capsule feeding faults

Hits OEE: Availability

Symptoms: Empty segments and capsules jamming in the magazine.

Capsule hopper level low

Keep the hopper above its minimum level.

Capsules damaged or out of specification

Check the capsule lot.

Static in a dry room

Control the room humidity within the capsule supplier range.

Worn magazine parts

Replace worn parts.

Prevention: Capsule lots checked at receipt.

Powder escaping around the dosing station

Hits OEE: Quality

Symptoms: Powder builds up around the dosing area and on capsules.

Dosing disc clearance worn

Measure and restore the clearance.

Settings not suited to a free-flowing powder

Adjust the tamping settings.

Weak extraction

Check the extraction.

Worn seals

Replace the seals.

Prevention: Clearances measured at planned services.

Checkweigher rejects rising

Hits OEE: Quality

Symptoms: More capsules rejected on weight during the run.

Checkweigher calibration

Calibrate the checkweigher.

Real fill variation

Check the dosing and the powder.

Static on the capsules

Control humidity and use ionisers where fitted.

Prevention: Reject rates trended per batch.

Machine out of time after a crash

Hits OEE: Availability

Symptoms: After a jam or crash the machine misfeeds or jams again.

Segments knocked out of alignment

Check segment alignment.

Bent pins or tooling

Replace bent parts.

Overload clutch tripped

Reset it as the maker describes.

Prevention: Alignment checks after every crash.

Capsules not ejecting cleanly

Hits OEE: Availability

Symptoms: Capsules stick in the segments or are damaged at ejection.

Segments dirty with powder

Clean the segments.

Ejection air low

Check the ejection air.

Worn segment bores

Replace worn segments.

Prevention: Segment cleaning during the run as the procedure allows.

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

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Stop the same fault coming back

Recurring capsule filler 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