Seal and pack
- Visible seal contamination
- Open or incomplete visible edges
- Folded and wrinkled seals
- Missing or displaced film
- Torn or deformed packs
- Pack presence and orientation
Inspect flexible packs at production speed
Pouch & Sachet Inspection Systems
Check visible seals, contamination, fill, print, labels, codes and pack presentation—then reject and confirm failed flexible packs.
Answer first
What does a pouch inspection system check?
An in-line pouch or sachet inspection system checks the visible pack features that protect product quality and identity: seal area, pack shape, contents or fill, printed data, artwork, labels and codes. Cameras, sensors or checkweighing are selected around the product and film.
Flexible packaging changes shape in motion. The conveyor, guides, lighting, triggers and reject timing are therefore part of the inspection—not accessories added afterwards.
Flexible-pack handlingMulti-check recipesVerified rejection
Inspection scope
Pouch and sachet quality checks
The agreed inspection window is proved with normal product variation plus representative good, bad and borderline packs.
Fill and contents
- Visible liquid or powder fill level
- Missing-product detection
- Component or count checks
- Underfill and overfill
- Pouch and sachet checkweighing
- Trend monitoring and filler feedback
Print and identity
- Artwork and colour verification
- Label presence and position
- Best-before and batch-code inspection
- OCR and OCV verification
- Barcode, QR and Data Matrix reading
- Product-to-pack matching
Typical formats
Stand-up pouchesFlat pouchesSachetsStick packsRetort pouchesSpouted pouchesFlow-wrap packsMedical pouches
Stable flexible-pack presentationControl shape, position and reflection before judging the pack.
Handling and illumination
Why flexible packaging needs application-specific engineering
- 01
Belts, guides, vacuum handling or controlled transfers keep the inspection area within the camera view.
- 02
Triggering is selected to cope with variable pitch, edges and pack movement.
- 03
Diffuse, backlit or polarised illumination manages glare, transparency and printed film.
- 04
Inspection regions follow the actual seal and artwork geometry rather than a nominal rectangle.
- 05
A suitable pusher, air blast, drop-flap or retracting-belt reject handles the pack without creating a second failure.
Choose the method by the risk
Vision, weight and integrity testing answer different questions
A camera is powerful when the defect is visible. It should not be used to claim an invisible seal or content property that requires another sensing principle.
Vision
Use for visible seal geometry, contamination, pack shape, artwork, labels, codes and exposed contents.
Checkweighing
Use for underfill, overfill or missing contents when the weight difference exceeds normal variation.
Integrity test
Use leak, pressure, vacuum or another validated method when microscopic channels or hermetic performance must be proved.
Combined control
Coordinate results, records and reject handling under one product recipe where several risks must be controlled.
Practical decision guide
Build a pouch trial that separates seal faults from handling variation
Use the same identified pouch samples to compare the image decision and the final pack response. Flexible material can change shape between a hand-held demonstration and a running conveyor, so the trial should cover the permitted presentation range.
Select the inspection stage for each feature
Draw where sealing, cooling, coding and secondary packing take place. Establish whether the seal area is visible and settled at each possible camera position. A transparent empty pouch and the same pouch filled with product can present very different backgrounds. State which features can be checked at one station and which require a separate stage or method.
Cross the defect samples with permitted variation
Include approved examples with normal wrinkles, print registration variation, gloss, fill distribution and pack orientation. Compare those with known faults at the relevant seal or print boundary. Avoid using only an extreme contaminated seal and one unusually flat good pouch: that does not show how near-limit decisions will behave on normal packs.
Test the inspection region while the pouch moves
Observe whether the required seal or code remains in view as the pouch changes position. Where software locates a moving region, challenge the least favourable allowed fold, rotation and pack edge. Define an unavailable inspection when the required feature cannot be seen; a convenient image of another region is not an equivalent check.
Prove containment on the least stable pack
Follow a failed pouch to its destination using the intended conveyor transfers and spacing. Include adjacent failed packs, a stop before rejection and normal pack-to-pack movement. Confirm that the rejection method separates the intended item without allowing it to rejoin accepted production. Document the response to a missing or uncertain result.
Keep visible appearance and integrity claims separate
A repeatable image of a clean-looking seal does not by itself establish leak-tightness. Retain the visual scope alongside any independently specified integrity method and its acceptance evidence. The seal inspection guide and checkweighing guidance help separate visible faults from the different questions answered by weight or integrity tests.
Direct answers
Pouch inspection FAQs
Representative film, filled packs and real seal defects are essential for feasibility work.
Ask an application question →What can a pouch inspection system check?
It can inspect visible seal contamination, folds, wrinkles, open edges, missing film, pack presence and orientation, labels, artwork, barcodes, date or batch codes and visible fill or contents, depending on presentation.
Can vision inspection prove that a pouch is leak-tight?
Not by vision alone. Cameras can inspect visible seal geometry and contamination, but hidden channels or microscopic leaks may require a separate leak, pressure, vacuum or other integrity test.
Can transparent and printed films be inspected?
Often yes. Lighting, filters, camera angle and background are selected around film transparency, gloss, print and product appearance, then confirmed with representative samples.
Can underfilled pouches be rejected automatically?
Yes where fill level is visible or the weight difference is distinguishable. Vision, sensing or dynamic checkweighing can provide the result for a tracked and verified reject system.
Manufacturer product photographs: Zebra machine vision camera from the VS70 product family. Hardware examples for the applications discussed.