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Assessment
Industry // Food & beverage

Machine vision inspection for food and beverage lines

Camera checks on filling, capping, labelling, coding and case packing lines.

Technical review: Frank GuoReviewed

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// Short answer

On a food or beverage packaging line, camera checks usually sit after the filler for fill level, after the capper for caps and tamper bands, after the labeller for label position and SKU, after the coder for date and batch codes, and at the case packer for counts. Washdown, condensation, foam and frequent changeovers decide how the station is built. Vision does not replace food safety testing, leak testing or checkweighing.

// Where it fits

Inspection points on a filling and packing line

A typical sequence for bottles and jars; your line may add or skip steps. Each check sits after the step that can cause the fault.

[Schematic]Process flow · not to scale

Swipe sideways to see the whole drawing →

Process flow of a food and beverage filling and packing line with inspection pointsContainers pass a filler, capper, labeller, date coder and case packer. Inspection points follow each step: fill level after the filler, cap and tamper band after the capper, label after the labeller, date and batch code after the coder, and a count at the case packer.PRODUCT FLOW →FILLINGCAPPINGLABELLINGDATECODINGCASEPACKING[1]FILL LEVEL[2]CAP &BAND[3]LABELPOSITION/SKU[4]CODEREAD/VERIFY[5]CASECOUNTINSPECTION POINTCAMERA + LIGHTING
[1] Fill level: after the filler, seen through the container.
[2] Cap & band: missing, high or tilted caps; missing tamper bands.
[3] Label: presence, position and the right SKU.
[4] Code: date and batch code present, readable and correct.
[5] Case count: every position filled before the case closes.
// Defect risks

What goes wrong at each step

Visible faults by step, and the application that checks for them.

Food and beverage production steps, visible faults and matching inspections
Production stepTypical visible faultsInspection
FillingUnder-fill or over-fill; foam at the neckFill level, cap & seal
CappingMissing, high or tilted caps; missing or broken tamper bandsFill level, cap & seal
LabellingMissing, crooked or flagging labels; the wrong label after a changeoverLabel & print inspection
Date codingMissing, faint or smudged codes; the wrong date or batchOCR/OCV & date codes
Case packingEmpty positions in a case, tray or multipackPresence, absence & counting
// Inspections

Checks that apply on food and beverage lines

Several can share one station when the features are visible from one position.

Fill level, cap & seal

Fill level through PET or glass, cap presence and tilt, tamper bands. Not a leak test.

At: filler and capper
Fill level, cap & seal

Label & print inspection

Label presence, position and SKU, including after flavour or pack-size changes.

At: labeller
Label & print inspection

OCR/OCV & date codes

Best-before dates and batch codes checked against the running product.

At: coder
OCR/OCV & date codes

Presence & counting

Every position in a case, tray or multipack filled before it is closed.

At: case packer
Presence & counting
// Application map

Food and beverage inspection scenarios by product

Common products on South African food and beverage lines, what a camera checks on each, and the application page with the detail. The method in each row is a starting point, confirmed on your own samples. Weight, seal tightness and foreign bodies inside a closed pack need a checkweigher, leak tester, metal detector or X-ray.

Food and beverage inspection scenarios: product and line position, what is inspected, typical fault, inspection method and related application
Product / line positionWhat is inspectedTypical fault caughtInspection methodRelated application
PET water bottlesafter the filler and capperFill level through the clear wall; cap height and tiltLow or high fill; missing, high or cocked capBacklight behind the bottle; side camera at the neckFill level, cap & seal
Returnable glass beer bottlesempty, after the bottle washerBase, sidewall and finish of the empty bottleChipped finish, residue or a foreign object in the base, the wrong bottle shapeBase camera lit from below; finish camera looking down with a ring lightEmpty containers & preforms
Canned soft drinksafter the seamer and coderDate and batch code on the can end or baseMissing, smudged or wrong code. The fill inside a can is not visible to a cameraCamera over the can end with dome light to calm the shiny metal; OCR/OCVOCR/OCV & code inspection
Fresh milk bottlesafter the capperCap colour against the product being filledThe wrong-colour cap after a changeover between milk typesColour camera above the cap with diffuse lightFill level, cap & seal
Fruit juice cartonsafter the carton fillerScrew cap on the carton topMissing or crooked capCamera looking down on the carton top, diffuse lightPresence & counting
Yoghurt pots with foil lidsafter the cup filler and sealerFoil lid present and centred; the sealing flange; lid printMissing or off-centre lid, product on the flange. Not a leak testDome light over the cups to calm foil glareFill level, cap & seal
Crisps (chips) and snack pouchesat the form-fill-seal bagger exitTop seal area and the printed best-before codeProduct trapped in the seal, creased seal, missing codeCamera at the jaw exit with light across the seal; OCR for the codeFill level, cap & seal
Sliced bread bagsafter the bag closerClosure clip or tag present and its printed day codeMissing clip, the wrong day on the clipCamera at the closer with diffuse light; OCV on the clipOCR/OCV & code inspection
Rolls and buns in bakery traysbefore trays are stackedEvery tray position filledEmpty or doubled positions, product on the tray rimOverhead camera with even diffuse lightPresence & counting
Sauce and condiment sachetsafter the multi-lane sachet machineSeal ends and print on every laneProduct in the seal, open end, misregistered printOne view across all lanes, with backlight or low-angle lightLabel & print inspection
Wine bottlesafter the labellerFront and back labels, neck capsuleCrooked or flagging label, the wrong back label for the vintage, missing capsuleSeveral cameras around the bottle, diffuse lightLabel & print inspection
Ready-meal trays with printed sleevesafter sleevingSleeve matches the meal in the trayThe wrong sleeve on a tray after a changeoverBarcode read on the sleeve plus an artwork checkOCR/OCV & code inspection
Shrink-wrapped multipacksbefore the shrink tunnelBottle or can count in each packA missing unit in the packOverhead camera before the film goes on; opaque film hides unitsPresence & counting
Shipping cases and palletsat the case sealer and stretch wrapperCase and pallet labels present, readable and matching the productMissing, unreadable or wrong labelFixed code reader or camera beside the conveyorCarton & pallet verification
// Integration

Conditions specific to food and beverage lines

These decide whether a station keeps working through cleaning and changeovers.

Washdown

Cleaning regime

Housings, cable glands and cable routes in the wash zone are chosen for your cleaning method and chemicals.

We askCleaning method and chemicals
Condensation

Cold containers sweating

Droplets on cold-filled containers scatter light and can look like defects. Lighting angle and check position are chosen to limit this.

We askProduct temperature at the check
Foam

Foam and moving product

Foam can hide the true fill level, and liquid still moving after the filler leaves an uneven surface. The check goes where the level has settled.

We askWhich products foam
Containers

Glass, PET and cans

Clear containers usually need a backlight to show the fill line. Glass reflects; cans and opaque containers hide the level altogether.

We askContainer materials and colours
Changeovers

Many SKUs, frequent changes

Each product needs a recipe. Selecting it from the line PLC at changeover avoids checking a new product against the old reference.

We askSKUs and how the product is selected
Hygiene

Mounting around open product

Brackets above open product are agreed with your hygiene team so they can be cleaned. Where possible, equipment sits after the product is closed.

We askHygiene zones and site rules
// Limits

What vision does not do on a food line

We agree these boundaries before a project starts.

Needs another method

  • Food safety testing. A camera does not test the product or replace microbiological or chemical testing.
  • Foreign bodies inside the pack. These need metal detection or X-ray inspection.
  • Seal integrity. A cap can be present and straight yet not sealed. Leak tightness needs a leak tester.
  • Net content. Fill level is not weight; declared quantity is proven with a checkweigher.

Works reliably when

  • Containers arrive consistently. Stable spacing, with a trigger at the inspection point.
  • Lighting is shielded. A shroud keeps daylight and wet reflections out of the image.
  • Recipes follow the product. Selected by the PLC when the SKU changes.
// Samples & acceptance

What to send for a sample test

We test your own containers before proposing a station; quantities and shipping are agreed first. The same samples later define acceptance.

Sample preparation guide

Good product

Units from normal production, covering each container and label on the line.

Defect samples

Under-filled, badly capped, mislabelled and miscoded units, each marked.

Product behaviour

Whether it foams, is filled cold or hot, and arrives wet at the check.

Acceptance

False rejects on good product and missed defects on marked samples, at line speed; levels agreed per project.

// FAQ

Food and beverage inspection questions

Can a camera detect under-filled bottles?
Usually, in clear or translucent containers where the fill line is visible, often with a backlight. Foam and condensation affect where the check goes. Cans and opaque containers need a different method.
How are date and batch codes checked on a bottling line?
A camera after the coder reads the code and compares it with the date and batch expected for the run (OCR/OCV). Missing, incomplete or wrong codes are rejected. We test codes from your own printer.
Can units in a case or multipack be counted before it is sealed?
Yes, where every unit is visible to the camera, for example from above an open case or tray. Units hidden under others or under opaque film cannot be counted from a single top view.
Does vision inspection replace food safety checks?
No. It checks visible packaging features. It does not test the product, find foreign bodies inside a closed pack or replace your food safety system and certification.
What does a bottle cap inspection system check?
A camera beside the neck checks that the cap is present, fully down and not tilted, and that the tamper band is there; a colour camera can also confirm the cap colour for the product. It does not measure torque or prove the seal is tight: that needs a torque tester or leak tester.
Can yoghurt cups and foil lids be inspected on the line?
Yes, for visible features: the lid is present and centred, the lid print and date code are correct, and no product sits on the sealing flange. Foil reflects strongly, so dome or diffuse light is used. Whether the seal is tight still needs a leak or seal-strength test.
Related:
Fill level, cap & seal →Label & print inspection →OCR/OCV & date codes →How we deliver a project →All industries →
// Food & beverage

Request an assessment for your line

Tell us the containers, SKUs, faults and cleaning regime. We will say which checks apply and what a sample test needs.

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