Buyer Guides / Label position acceptance

Front and Back Bottle Labels: Agree the Position Before the Machine Trial

Published October 16, 2026 · Procurement and acceptance planning

A bottle can carry two smooth labels and still look wrong: the front sits too high, the back is off-center, or the pair does not match the approved artwork. Before ordering a double-side labeling machine, turn “make the labels straight” into an agreed position drawing and a repeatable sample check.

Start with the actual bottle, not the machine name

ZXSMART lists a double-side labeling configuration for flat, square and suitable shaped bottles with front and back panels. Bottle geometry and label layout need confirmation before configuration. Do not assume that the same arrangement handles unstable round bottles or a wrap-around label.

Review the relevant configuration: Double-side labeling configuration

Mark the reference for each label

Prepare a drawing showing where the front and back label should sit on the actual production bottle. Identify the reference used for each measurement and let the buyer and supplier agree how it will be checked. A bottle base, panel edge or other feature is useful only if both parties use the same clearly defined reference.

Separate label height, sideways position and visible tilt. Also show how the two labels should relate to each other. Do not rely on a perspective photograph as the only acceptance standard. Retain an approved physical sample alongside the drawing where practical.

Agree position tolerances with the supplier for the actual configuration and samples. This guide does not prescribe a universal millimeter tolerance or claim a standard ZXSMART positioning accuracy.

Check more than one attractive sample

Use representative production bottles and final label rolls. Agree the trial quantity, operating conditions and acceptance rules before the demonstration. Check both faces on each sampled bottle rather than selecting one good front label and a different good back label.

Keep trial records for the intended formats. If the project requires multiple bottle sizes, record which combinations were actually demonstrated. A successful trial on one shape is not proof that every shape is covered.

For normal stops, restarts and changeovers that matter to the project, ask the supplier to include an agreed, safe verification sequence. Operators should not reach into a running machine or bypass guarding to inspect labels.

Separate position from other label defects

A label may be correctly positioned but wrinkled or lifting. Conversely, a smooth label may be in the wrong place. Record these as separate observations so an adjustment is not accepted merely because one symptom improves.

For surface wrinkles, use the existing troubleshooting guide: Wrinkled-label troubleshooting For roll winding and artwork feed direction: Label roll ordering guide

Do not prescribe belt pressure, sensor changes or bottle-orientation equipment from a photograph alone. Ask the responsible supplier to diagnose the observed behavior against the machine design and tested bottle.

Keep the handover record useful

Keep the approved position drawing, sample identifiers, tested bottle/label combinations, operating conditions and measured results with the acceptance record. Record unresolved differences rather than describing the trial as passed without an agreed basis.

Planning front and back labeling for personal-care or cosmetic containers? Start with bottle photos or drawings, front and back label dimensions, intended positions and required output. ZXSMART can identify which physical bottles and label rolls are needed later for tooling or the agreed trial; do not ship samples before that requirement is confirmed: Discuss your labeling application