Most label roll failures on a bottling or filling line come from five causes: a die-cut too deep that weakens the liner so it tears at the peel plate, liner too weak for the line speed and tension, badly made splices, adhesive bleeding at the roll edges so labels stick or do not release, and a roll that does not match the machine (winding direction, core, outer diameter, gap). Diagnose first whether the liner or the label fails, and where: unwinder, peel plate or rewinder. Keep the failed roll and its batch label for the supplier.
- A liner that tears always at the peel plate usually points to die-strike damage or a liner too weak for the tension.
- Labels that do not detach often mean adhesive bleed, an incomplete die-cut or a matrix that was not fully stripped.
- Splices should be few, well made and clearly marked; agree a maximum per roll.
- Clear labels on clear liner need a sensor that can see the gap.
- Rolls that arrive deformed, telescoped or stored badly cause failures that look like machine problems.
First: what breaks, and where?
Before changing settings or blaming the material, note three things: whether the liner (the backing) or the label fails, where on the machine it happens (unwinder, along the web path, peel plate, rewinder) and when (start of roll, middle, end, or only at high speed). The pattern usually points to the cause.
| Symptom | Most likely cause | What to check or change |
|---|---|---|
| Liner tears at the peel plate | Die-cut too deep (liner scored) or liner too weak for the tension | Inspect the liner against light for cut marks; ask for a stronger liner (e.g. film liner for high speed) and die-cut depth control |
| Liner breaks at the unwinder or at start of roll | Unwind tension or brake too high; crushed or loose core | Unwind brake setting; core condition and diameter |
| Breaks at a splice | Splice badly made or not detected | Agreed splice method, maximum splices per roll, coloured splice marking |
| Labels do not detach, or come off two at a time | Incomplete die-cut, adhesive bleed, or matrix remnants | Check edges for oozing adhesive; check die-cut through the facestock |
| Missed or double labels | Gap sensor cannot read the gap; wrong gap | Sensor type (clear-on-clear needs a suitable sensor); label gap specification |
| Labels lift before reaching the product | Facestock too stiff for the peel plate radius, or static on film labels | Material stiffness; static control on the line |
| Roll wanders or telescopes | Winding tension at the supplier, transport or storage damage | Roll condition on arrival; storage; packing method |
Liner breaks: the most common cause
The liner carries the labels through the machine and is pulled hard around the peel plate. If the cutting die went slightly too deep, it scores the liner along every label edge. The liner then tears exactly where the stress is highest. Holding a stripped section of liner against the light often shows the cut lines.
The other cause is a liner that is simply too light for the line speed. Glassine paper liners are common and work well at moderate speeds; film (PET) liners are thinner, stronger and typical on fast lines and for clear labels. If the line has become faster, the liner specification may need to change with it.
Adhesive bleed and labels that will not release
Adhesive can slowly flow out at the edges of the roll, especially with heat, pressure from tight winding, or long storage. The roll edges become sticky, labels drag, or the matrix tears during production. Signs: tacky roll sides, dust stuck to the edges, labels whose edges are glued to the liner. Ask the supplier about the adhesive's suitability for your storage conditions and make sure rolls are used first in, first out. See our guide on how to store label rolls.
Roll specification mismatches
Many breaks blamed on the material come from a roll that does not match the machine: wrong winding direction, a core that does not fit the chuck, an outer diameter too large for the unwinder, or a label gap the sensor cannot read reliably. Write the roll specification down once, with a photo of a good roll on the machine, and attach it to every order. The quote specification checklist lists what to include.
What to send the label supplier when a roll fails
- The roll or a section of it, with the failure point marked.
- The batch or roll label from the core or the box.
- Line speed, machine type and where the failure happens.
- Storage conditions and how long the rolls were in stock.
- Photos of the web path and the peel plate.
With this information a supplier can usually say whether the cause is in the roll (die-cut, liner, splices, adhesive) or in the line set-up, and propose a change instead of a replacement of the same thing.
Need a second opinion?
Send photos of the failed roll and your line data through the specialist contact form: we will tell you what to check and which specification to change.
Frequently asked questions
Why does the label liner tear at the peel plate?
Most often because the die-cut went too deep and scored the liner, or because the liner is too weak for the line tension and speed. A stronger liner or tighter die-cut control usually solves it.
What is adhesive bleed?
Adhesive slowly flowing out at the edges of a roll, usually from heat, tight winding or long storage. It makes rolls sticky and causes jams and labels that do not release.
Why does my labeller miss labels on clear labels?
Clear labels on a clear liner give an optical gap sensor almost no contrast. Lines running clear labels need a sensor able to detect the gap, such as a capacitive or ultrasonic sensor, or a suitable liner.
How many splices are acceptable in a label roll?
There is no universal number: agree a maximum per roll with the supplier, the splice method, and a visible marking so operators can watch for them.