Form-fill-seal machine Troubleshooting: Causes & Fixes

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Problems on this page:

Seal leaks or weak seals Film tracking or registration drift Bag or portion weight out of spec

Seal leaks or weak seals

Hits OEE: Quality

Symptoms: Leaking packs, failed seal tests, product spoilage risk.

Seal temperature, pressure or dwell wrong

Tune jaw temperature, pressure and dwell for the film.

Product or dust in the seal area

Improve dosing/timing; add seal-area cleaning or gas flush.

Worn jaws or PTFE

Replace seal jaws, PTFE and elements.

Prevention: Validated seal settings, clean seal zone, jaw maintenance.

Film tracking or registration drift

Hits OEE: Performance

Symptoms: Print or eye-mark drifts, off-centre seals, waste at start of run.

Registration sensor not reading the mark

Calibrate the eye-mark/registration sensor and contrast.

Web tension wrong

Set unwind and dancer tension; check for slippage.

Film or splice variation

Tighten film spec; manage splices.

Prevention: Sensor calibration, tension control, film quality.

Bag or portion weight out of spec

Hits OEE: Quality

Symptoms: Over or under-filled bags, giveaway, checkweigher rejects.

Dosing system drift

Recalibrate the auger/multihead/volumetric filler.

Product bulk-density change

Adjust for density; control product condition.

Timing between fill and seal

Sync dosing with the bag cycle.

Prevention: Filler calibration, product control, timing checks.

Form-fill-seal machine troubleshooting FAQ

Form-fill-seal machine: what causes seal leaks or weak seals, and how do I fix it?

Symptoms: Leaking packs, failed seal tests, product spoilage risk. Likely causes: Seal temperature, pressure or dwell wrong; Product or dust in the seal area; Worn jaws or PTFE. Fixes: Tune jaw temperature, pressure and dwell for the film. Improve dosing/timing; add seal-area cleaning or gas flush. Replace seal jaws, PTFE and elements. Prevention: Validated seal settings, clean seal zone, jaw maintenance.

Form-fill-seal machine: what causes film tracking or registration drift, and how do I fix it?

Symptoms: Print or eye-mark drifts, off-centre seals, waste at start of run. Likely causes: Registration sensor not reading the mark; Web tension wrong; Film or splice variation. Fixes: Calibrate the eye-mark/registration sensor and contrast. Set unwind and dancer tension; check for slippage. Tighten film spec; manage splices. Prevention: Sensor calibration, tension control, film quality.

Form-fill-seal machine: what causes bag or portion weight out of spec, and how do I fix it?

Symptoms: Over or under-filled bags, giveaway, checkweigher rejects. Likely causes: Dosing system drift; Product bulk-density change; Timing between fill and seal. Fixes: Recalibrate the auger/multihead/volumetric filler. Adjust for density; control product condition. Sync dosing with the bag cycle. Prevention: Filler calibration, product control, timing checks.

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

Stop the same fault coming back

Recurring form-fill-seal machine stops usually trace to a cause you cannot see by hand. The partner we recommend is Fabrico: EU-built, so your production data stays in EU jurisdiction, with computer-vision true-cause of micro-stops, a closed loop from PLC-read OEE to an auto-routed work order, and ISO 27001 / 20000-1 / 9001 (supports audit-readiness).

See how Fabrico finds root cause

OEE Lab is built and operated by Fabrico. The directory stays free.

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