Bottle labelling guide
Clear vs white label sensors on bottle labellers.
Understand why label material and backing paper affect sensing and machine specification.
Most labellers need to detect the label gap.
A bottle labeller dispenses labels from a roll and needs to know where one label ends and the next begins. With standard opaque labels, gap sensing is usually more straightforward.
Clear labels can be more difficult because the contrast between label and backing paper is reduced.
Transparent labels may need specialist sensing.
Clear-on-clear or transparent labels may require ultrasonic or other suitable sensors depending on the material. This should be checked with the actual label roll, not only artwork or supplier descriptions.
Metallic materials, dark backing or unusual varnish can also affect sensing.
Testing prevents production surprises.
If the label sensor cannot consistently detect the label gap, the machine may double-feed, misplace labels or stop. Sending label rolls early allows the application to be checked before final commissioning.
Checklist before you enquire
- Label material and finish
- Backing paper colour and thickness
- Gap between labels
- Clear, metallic or opaque label type
- Label roll unwind direction
- Whether labels are printed yet
- Target speed and accuracy
- Sample roll for testing
FAQ
Common questions.
Do clear labels need a special sensor?
Often they do, but it depends on label and backing material.
Can the sensor be chosen from artwork?
No. The actual label roll is needed for reliable sensor selection.
Are white labels easier to sense?
Generally yes, if there is good contrast at the label gap.
Should label material be discussed before ordering rolls?
Yes, especially for transparent or unusual materials.
Next steps
Related bottle labelling pages.
Test the finished label construction
Send the complete production label roll specification, including the label stock, liner, coatings and any metallic or transparent areas. A description such as clear label is too broad to confirm the sensing arrangement. Ask which exact materials were used when the proposed sensor setup was demonstrated.
If several artwork versions share a stock, include the versions with different print coverage or embellishments in the sample discussion. Request the trial record to identify the sensor arrangement and the changeover checks needed when the roll is replaced or the label supplier changes.
- Separate detection events
- Confirm how the machine detects the container and how it detects the label; a clear bottle and a clear label create separate assessment questions.
- Record a fault
- When diagnosing a missed feed, note whether the issue follows a roll splice, artwork change, speed change or a particular portion of the roll.
Does a successful test on white labels approve a clear-label version?
No conclusion should be drawn without checking the new construction. Ask for a representative roll trial and written confirmation of the sensing and setup changes required for that label version.