Protect pack integrity
Catch visible sealing defects before secondary packaging or dispatch.
Vision & thermal seal inspection
Find heat-seal faults before finished packs leave the line
Inspect critical seal regions at production speed using visible-light vision, thermal imaging or combined sensing selected around the real defect.
The inspection challenge
Turn a variable sealing process into a controlled inspection point
Seal appearance changes with film, tooling, product, temperature and line conditions. A correctly engineered inspection station checks the defined region on every pack and supplies traceable pass/fail information to the reject system.
- Seal presence and continuity checks
- Fold, wrinkle and channel detection
- Contamination within the seal region
- Missing or displaced film detection
- Recipe-controlled tolerances by SKU
- Reject confirmation and fault logging
Production outcomes
Designed to make every decision useful
Reduce subjective checks
Apply the same programmed inspection rules to every pack.
Support root-cause work
Use defect images and trends to identify recurring process issues.
Application framework
What the system can include
Final scope follows trials and a line survey. The table shows the main engineering considerations for this inspection type.
Send us your pack detailsTypical packsTrays, pouches, sachets, tubs, cups and lidded containers
Inspection methodsMachine vision, controlled lighting, thermal imaging or combined sensing
Line integrationEncoder tracking, PLC handshake, recipe selection and reject confirmation
OutputsPass/fail signal, fault class, image record and production counts as specified
Thermal seal inspection
Use the heat pattern when appearance alone is not enough
A thermal camera captures the temperature distribution immediately after the sealing process. Changed cold, hot or uneven areas can indicate insufficient heating, overheating, incomplete energy transfer or some forms of product trapped in the seal.
Thermal imaging does not automatically prove package strength or leak-tightness. Film emissivity, reflections, distance from the sealer, line stops and product temperature all influence the result, so representative trials are essential.
Compare inspection methodsBest positionSoon after sealing while useful thermal contrast remains
Potential signalsCold regions, overheating, uneven patterns and discontinuity
Control inputsRecipe, timing, product temperature and stable presentation
Complementary checkVisible-light vision or leak testing where the risk requires it
A controlled route to production
From sample pack to validated inspection point
Reliable inspection begins with realistic defects and finishes with the line proving that the correct failed pack was removed.
Define the fault
Agree the pack, line speed, critical seal area and pass/fail tolerance.
Prove the image
Trial representative good packs, known failures and normal production variation.
Engineer the station
Specify handling, optics, lighting, controls, guarding and reject method.
Integrate & validate
Install, commission and test the complete inspection and rejection sequence.
Practical answers
Thermal and heat-seal inspection questions
Clear answers before you invest in an in-line inspection project.
How does thermal seal inspection work?
A thermal camera measures the post-seal temperature pattern. Abnormal cold, hot or uneven regions can indicate a changed sealing process, but timing, materials and normal product temperature variation must be proven with trials.
Can a vision system detect a weak seal?
A conventional camera detects visible indicators such as gaps, folds, contamination and incomplete seal patterns. Where strength is not visually apparent, thermal imaging or an appropriate leak test may be needed.
Will it work with printed lidding film?
Usually, provided artwork movement and normal print variation are included in the inspection design and recipe tolerances. We prove the approach with representative good and defective samples.
Can failed packs be rejected automatically?
Yes. The inspection can be integrated with a suitable air blast, pusher, drop-flap, retracting conveyor or other reject mechanism, with confirmation and reject-bin monitoring where required.
Application guidance
Define the defect before choosing vision or thermal imaging
These guides separate visible faults, AI classification and acceptance evidence so the final method can be justified against real samples.
Defect evidenceHeat-seal defect types, causes and inspection methods
Variable appearanceWhen AI vision helps—and when it does not
AcceptanceURS, FAT and SAT planning checklist