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Application guide · Fill levels and closures

Inspecting returnable glass bottles before filling

By Frank GuoPublished Updated 5 min read

// The inspection task

Returnable glass bottle inspection involves several independent visible regions. A top view can help inspect the mouth, a bottom view can reveal base contamination, and side views address wall conditions. No single attractive bottle image establishes all of those requirements, especially with residual water or labels after washing.

Application guide by addaScanCompare the inspection task, imaging conditions and validation steps with your own production line.

Task
Returnable glass bottle inspection
Decision focus
Empty bottle inspection
Workflow
Separate bottles before the filler.
Validation
Good worn and damp returns
Application images

Accepted scuffing, mouth chips and internal objects

Original explanatory diagrams show the product states and inspection questions. They are schematics, not captured inspection results.

Returnable glass bottle inspection: accepted wear — explanatory diagram. Normal scuffing must be represented in the good set.
Accepted wear

Normal scuffing must be represented in the good set.

Returnable glass bottle inspection: mouth chip — explanatory diagram. A finish view checks the visible rim.
Mouth chip

A finish view checks the visible rim.

Returnable glass bottle inspection: internal object — explanatory diagram. A separate optical path is needed inside the bottle.
Internal object

A separate optical path is needed inside the bottle.

Returnable glass bottle inspection: obscured region — explanatory diagram. A label or heavy scuffing can hide the target area.
Obscured region

A label or heavy scuffing can hide the target area.

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Match bottle-mouth, base and wall faults to their views

Explore Empty container and preform inspection and Returnable glass bottle inspection to connect this inspection task with the wider station requirements.

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Inspection decisions for returnable glass bottle inspection
DecisionEvidence to useRule to agree
Finish acceptableInspect the visible mouth circumference.Account for chips at difficult angles.
Interior visibly clearCheck the defined internal regions.State which objects and locations are covered.
Container inspectableRecognise the family and confirm required views.Hold unknown or heavily obscured bottles.

Locate the bottle family before applying region rules

Confirm the bottle recipe and locate the mouth, base and wall regions using the expected geometry. A different bottle family can shift the regions and change normal refraction. Use approved wet and dry samples to understand residual-water appearance rather than teaching every dark feature as contamination.

Choose the inspection point after washing according to stability, visibility and drainage. Sidewall coverage may require several views or rotation. A label or handling component can block a wall region even when the other views are clear. Record coverage explicitly and keep mouth defects separate from wall or base contamination.

Schematic bottle with mouth, sidewall and base inspection callouts and a shaded label area that blocks part of the wall view.
Mouth, wall and base checks require suitable views. A clear sidewall result cannot compensate for an unseen base or damaged mouth.

On a small screen, scroll across the diagram to inspect the labels.

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Choose the approach from the observable task
ApproachUseful whenWhat to validate
Mouth viewRim damage is a priority.Match the view to finish geometry.
Base/interior viewVisible objects inside the container are the target.Test base patterns and water droplets.
Combined sidewall viewsAdditional circumferential coverage is required.Manage embossing, wear and view association.

Worked example: a clear sidewall does not clear the bottle

In an illustrative inspection, the side views appear acceptable but the mouth view shows a missing edge segment. The bottle fails the mouth rule regardless of the clean sidewall. Another bottle has a dark base feature whose appearance is ambiguous with residual water. Hold it for the qualified recheck route, retaining both the base and full bottle context.

If drainage and a repeated view resolve the feature as acceptable water behaviour, record that attempt under the same bottle event. If contamination remains, reject it. A third bottle has an opaque remnant label covering a required wall area; its wall result is incomplete, not clear. Release requires all mandatory regional decisions and confirmation of the correct bottle handling.

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Evidence, decision and recovery for assign each bottle region to its view
Observed evidenceInspection decisionAction and retained record
A mouth-edge segment is absent in a correctly located top view while sidewalls appear clear.Mouth defect fails independently of sidewall acceptance.Store the mouth evidence and bottle recipe, reject the bottle and verify that the correct event reaches the removal point.
A base feature changes after the qualified drainage and recheck step.Resolve against approved residual-water behaviour.Keep both base images under the same bottle event and record why the final condition meets or fails the contamination criterion.
An opaque label remnant blocks a required wall region.Wall coverage incomplete, not a clean-wall result.Hold or route for the defined recovery, then repeat the relevant full coverage check and retain the missing-region record.

What happens to a rejected bottle after the washer?

  1. 01Present after washingSeparate bottles before the filler.
  2. 02Capture each regionUse mouth, interior and side views as required.
  3. 03Combine decisionsRequire complete inspection of the same bottle.
  4. 04Confirm rejectionPrevent the rejected bottle entering the filler.
Inspection sequence: validate event association and exception handling on the line.

Confirm bottle spacing and identity through the multi-view station. Combine all required checks before the filler decision, and define what happens to an unfamiliar bottle or an obscured view. Reject confirmation matters because an image alarm alone does not remove the container from the filling stream.

Challenge the combinations found after washing

Include chipped mouths, base contamination, residual water, label remnants and the permitted bottle-family variation. Test a missing camera view and a bottle entering skewed. Verify that a good result from one region cannot overwrite another region's failure.

Keep each view and defect location with the bottle event. This supports a useful process investigation while respecting the boundary between visible inspection and any additional cleanliness or strength requirements.

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Validate the sample challenges against the agreed product limits.
ChallengeWhat the trial should establish
Good worn and damp returnsEstablish acceptable appearance variation.
Mouth damage around the finishVerify angular coverage.
Internal objects at difficult positionsDocument what remains hidden.
Wrong bottle family or missing viewConfirm the hold and reject behaviour.

What visible bottle inspection cannot confirm

Visible inspection does not prove sterility or the absence of transparent chemical residue. An apparently clear bottle can still fail a separate washing or hygiene requirement. Do not infer that a bottom image covers the mouth, or that a good mouth image establishes the integrity of the whole bottle.

Use Visual seal inspection vs leak testing to develop the related acceptance and integration questions for your trial.

Returnable bottles and damage samples to test

Use the bottling and canning guide to consider where an empty-bottle check sits between washing and filling.

Provide returned bottles with representative wear, water and embossing, known mouth chips, visible internal objects, bottle dimensions and the washer-to-filler layout.

Use the optical and recovery challenges above when applying the architecture choices in HIKROBOT and other vision solutions comparison.

Scope and budget

Review base, sidewall and neck coverage with the returnable glass bottle inspection scope and cost factors before deciding how many views are needed.

Testing and handover

Use the testing and handover process to agree the washer-exit presentation and a confirmed route for damaged or incompletely inspected bottles.

// Based in Johannesburg · Serving South Africa

Assess your returnable bottle checks

Describe the returned bottle formats, washer position and visible damage or residues to detect. Include the existing handling route for a bottle that cannot be inspected completely.