| Types | Sleeve, hot melt glue OPP, rotary sticker, self-adhesive |
| Throughput | Matched to the filler, with an accumulator between |
| Key control | Label position, glue pattern, shrinkage, adhesion |
| Wetted parts | OPP film, PVC or PETG sleeve, paper sticker |
| Key decision | Full sleeve or partial wrap |
| Line position | After filling, before packing |
The label is positioned relative to the bottle, so any variation in bottle rotation, conveyor speed or label feed shows up as drift. On a round bottle the orientation is set by a roller or a star wheel; on a square bottle it is set by a mechanical aligner. Drift is usually a bottle handling problem, not a label problem.
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 type | Cost per unit | Best for |
|---|---|---|
| OPP wrap-around | Lowest at volume | High-speed round bottles |
| Full-body sleeve | Higher film cost | Full coverage and shaped bottles |
| Self-adhesive sticker | Middle | Short runs and flat or curved panels |
| Paper label with glue | Low material, slower | Glass bottles and craft products |
Throughput and change-part lists are on the Rotary Sticker Labeling page rather than in this note.
Surface energy, bottle temperature and glue choice. A cold bottle straight from the filler carries condensation, and a water-based adhesive will not bond to it. Hot melt handles a damp surface better, which is why it dominates high-speed beverage lines.
The unit behind this configuration is the Sleeve Labeling.
Because a missing or skewed label is a customer reject that the line cannot see. A camera at the labeller outlet with a reject gate catches it at the source, before the packer hides it inside a case.
The same question is worked through from another angle in How to Select a Labeling Machine for Your Specific.
Perforation strength, film tension and tunnel temperature act together. A tear that appears after shrinkage usually means the perforation was cut too deep for the film gauge.
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.
With two applicators or a combined unit, yes. They are separate stations with separate film paths, so the line needs the space and the changeover time for both.
Usually too little glue, a cold bottle, or a seam pressed before the glue sets. Check the glue pattern and the bottle temperature before changing the speed.
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