How to Automate Labeling for Large Bottling Lines

Views: 3152 Author: Howie SUN Publish Time:
Label choice is a cost-per-unit decision before it is a design decision: sleeve, OPP wrap and sticker differ in film cost, speed and changeover.
Key facts at a glance
TypesSleeve, hot melt glue OPP, rotary sticker, self-adhesive
SpeedMatched to the filler, with an accumulator between
Key controlLabel position, glue pattern, shrinkage, adhesion
Wetted partsOPP film, PVC or PETG sleeve, paper sticker
Key decisionFull sleeve or partial wrap
Line positionAfter filling, before packing

Sleeve, OPP or sticker: what decides the choice?

A full-body sleeve covers the whole bottle and gives the most design freedom, at the cost of film and a shrink tunnel. An OPP wrap-around label is the cheapest per unit at high speed. A sticker suits short runs and curved surfaces where a wrap is impractical.

What does a shrink sleeve need to look right?

A consistent shrink needs the right film direction, a controlled tunnel temperature profile and a bottle that does not deform. Steam tunnels give a softer shrink than hot air and suit thin-wall bottles. A wrinkle at the shoulder is usually a film or temperature issue, not a speed issue.

Label typeCost per unitBest for
OPP wrap-aroundLowest at volumeHigh-speed round bottles
Full-body sleeveHigher film costFull coverage and shaped bottles
Self-adhesive stickerMiddleShort runs and flat or curved panels
Paper label with glueLow material, slowerGlass bottles and craft products

Rated output, change parts and services are listed on the Rotary Sticker Labeling page.

How much glue does an OPP labeller use?

Hot melt glue is applied at the leading and trailing edge and at the seam. The pattern, the pot temperature and the nozzle condition decide how much is used and how clean the bottle looks. Glue strings and smears are the usual complaint, and they come from temperature and nozzle wear.

The unit behind this configuration is the Sleeve Labeling.

How is the labeller synchronised with the filler?

Through the conveyor and an accumulator, not through a mechanical link. The labeller runs slightly faster than the filler and the accumulator absorbs the difference. A labeller matched exactly to the filler speed will stop the line at the first roll change.

The same question is worked through from another angle in How Labeling Accuracy Impacts Beverage Brand Image.

How to read the numbers. Rated capacity in this note follows the product specification range, not a factory acceptance test. Roll changes and label-format changeover sit outside a rated rate, so plan on 0.65-0.85.

Frequently asked questions

What line speed can a sleeve labeller run?

It is matched to the filler, typically with margin above the filler rating so that a short stop does not reach the filler. The practical limit is the shrink tunnel dwell time, not the sleeve applicator.

Can one labeller run sleeve and OPP?

Not without a change of the applicator. Sleeve and wrap-around are different machines with different film paths, so a plant running both normally has two labellers.

How often should glue nozzles be cleaned?

On a fixed production interval set by the glue supplier and the plant, and immediately after any stop long enough for the glue to cure. A clogged nozzle shows as a missing glue line and a label that lifts in the pack.

What adhesive is used for OPP labels?

Hot melt glue applied at the leading edge, the trailing edge and the seam. The pattern and the pot temperature decide both the bond and how clean the bottle looks.

Key takeaways
  1. Position drift is a bottle handling problem, not a label problem.
  2. Sleeve quality is a tunnel profile and film direction question.
  3. Perforation, tension and tunnel temperature act together.
  4. A lifted seam is a glue and temperature question first.
About the author
Written by the Sunswell engineering team - led by Howie SUN, Founder & CEO, with 14 years in filling and blow-moulding equipment R&D and turnkey project delivery across 71+ countries.
Last reviewed: 2026-08-28 . Reviewed by Sunswell engineering team
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