Checking labels, caps and product mix before beverage packing

Check the label, cap and product before case packing

A finished beverage bottle can fail in several independent ways. A bottle with a cap can still have no label; a labelled bottle can still belong to the previous product run. Each question needs its own visible feature and acceptance condition.

The inspection point before case packing should expose the required features while there is still an identified hold or reject route. Select a smart camera or a multi-view system from that coverage requirement and the handling sequence.

Define the three decisions separately

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Presence is not identity. A label-shaped region may prove that something is attached without proving that it is the right label. Similarly coloured products may need a distinctive artwork feature, readable product text or a code compared with the approved recipe. Those additional methods must be selected from the actual samples.

Cap presence also has a limited scope. It does not establish closing torque, seal integrity or tamper-band condition. Add those as separate inspection or test requirements when they matter. The broader label verification application explains presence, position and identity checks.

Can one camera cover the label and cap?

Start with the views rather than the camera count. An image must show the closure and the distinguishing label feature at the same time. Increasing the field of view to fit the whole bottle can leave too little detail for a small printed feature. A feature on the far side of a rotating bottle is another problem: extra pixels do not make it visible.

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An integrated vision device is worth evaluating when the required views and tools fit the task. Compare current functions and interface requirements in the HIKROBOT smart camera selection guide. Select fixed-rule or trained tools after testing the distinguishing product features.

Make the image decision part of the line decision

Glossy labels, clear shoulders, condensation and moving bottles can change the image even when the product is acceptable. During sample work, compare lighting directions and diffusion, check the cap against its background, and test the normal range of bottle positions. Choose exposure and illumination together so the moving image still resolves the required feature. The lighting guide explains the options.

Keep the image decision associated with its bottle until the physical hold or reject point. A no-read, incomplete view or missing expected-product reference needs its own response and cannot inherit the previous bottle’s pass. A reject command also needs the agreed confirmation that the intended bottle was removed.

Record the individual reason as well as the overall decision: missing label, missing cap or identity mismatch. At changeover, confirm that the expected product and the inspection recipe have changed together. See PLC and reject integration and packaging changeover verification for these controls.

Validate with bottles that fail in different ways

A run of good bottles cannot show whether the system distinguishes a wrong product from an incomplete pack. Prepare controlled challenge samples for each decision, together with acceptable variation. Keep challenge bottles identified and account for them after the trial.

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Measure false rejects on acceptable bottles and missed defects on the deliberately faulty samples separately. Agree how both are calculated and what is acceptable before testing at the intended line conditions. Also witness the physical hold or reject: an accurate image classification is only one part of a working inspection station.

Worked example: a similar bottle survives the first check

In an illustrative run, a bottle from the previous product has both a label and a cap. Presence checks pass, but its distinguishing label field disagrees with the active recipe. The combined bottle result is an identity failure, with both presence results retained for diagnosis.

Track that bottle to the reject point and request removal. If reject confirmation is absent, the image classification is still correct but containment is unconfirmed. Stop or contain the affected flow under the agreed recovery procedure. Reconcile the held bottles and inspect them again where necessary; do not convert the failed event into a pass because the next bottle is correct. Store the recipe, bottle images, individual results and final handling outcome together.

Prepare a useful sample assessment

For the surrounding line, the bottling and canning guide connects product changeovers, bottle handling and the checks before packing.

Provide the bottle families and variants, approved labels, representative caps, the defects to detect and the products that could be mixed in. Include normal cosmetic variation, photos of the available installation space, bottle spacing, operating speed and details of the PLC and reject equipment.

Use the label verification SOP to define the expected identity. For a PET water line, the bottled water inspection solution shows how label checks can sit alongside fill, closure and date-code tasks. Assign each additional requirement its own evidence and acceptance rule.