Laser die cutting takes the blade out of the process. The beam cuts through facestock and adhesive and has to stop inside the liner — so the material choice decides whether you get a clean label or a smoked edge, a burnt liner and a jammed rewinder.
Model guide · last verified 2026-10-21 · published in English · technical questions: contact the lab
A laser does not shear material, it vaporises a narrow kerf. How much energy a layer absorbs depends on its pigment loading, coat weight and density — not on how the material feels in your hand. Two papers that die cut identically on a rotary press can behave completely differently under the same beam.
That is why material selection for laser finishing is a different exercise from material selection for mechanical die cutting. The three variables below decide most of the outcome.
The beam must cut the facestock and the adhesive, then stop inside the liner without breaking through. A dense, well formed glassine sheet at 60–80 gsm gives a more predictable stop than a light 54 gsm liner, and a PET film liner gives the sharpest contrast between cut and no-cut because it does not absorb energy the way paper does. If your liner is too light or too porous you will see penetration, silicone damage and premature release on the rewinder.
A cast-coated surface with a level coat cuts at a constant energy setting. A heavily textured or unevenly coated paper forces the operator to over-power the beam to clear the high spots, and the low spots then char. If the same roll runs at two different power settings on two machines, the problem is usually coat weight variation, not the laser.
PVC facestocks release hydrogen chloride when they decompose. In an enclosed laser finishing unit that means acid vapour on the lens, on the extraction path and on the metalwork. The damage is cumulative and expensive. For laser work we recommend BOPP, PET or paper, and we will say so even when a customer asks for PVC.
The table below lists constructions from our current range that customers run on laser finishing equipment. Facestock, adhesive and liner are exactly as they appear on the technical data sheet — we have not rounded or generalised them.
| Code | Facestock | Adhesive | Liner | Why it suits laser finishing |
|---|---|---|---|---|
| FL0310W21 | 36 mic glossy white PET film | Water-based | 60 gsm white glassine | Thin, dimensionally stable film; clean kerf, low edge char |
| FL0301W21 | 60 mic glossy white PET film | Water-based | 135 gsm white liner | Heavier liner widens the power window on high-energy settings |
| UV0201W21 | 36 mic glossy white BOPP film | 21 ± 3 mic (ISO 2808) | 60 gsm white glassine | Conformable film for curved and squeezable containers |
| UV0301W21 | 36 mic matte white BOPP film | 21 ± 3 mic (ISO 2808) | 60 gsm white glassine | Matte surface hides beam marks better than gloss |
| UV0401W21 | 80 mic transparent BOPP film | 21 ± 3 mic | 60 gsm white glassine | Clear-on-clear; thicker film resists melt-through at the edge |
| MJ0401W21 | 75 mic glossy white PET film | Water-based permanent acrylic | 80 gsm glassine | Higher liner weight for page-wide inkjet plus laser finishing |
| LJ0401W21 | 25 mic glossy white PET film | Water-based | 135 gsm white liner | Lowest profile in the range; for tight curves and thin labels |
| OF0107W21 | Glossy white PET film (sheet) | Water-based acrylic | 135 gsm | Sheet-fed offset print, then laser cut from sheet |
All eight are standard constructions, not development samples. TDS with measured values is available for each code.
Once you have decided that laser finishing is viable, the remaining choice is driven by the container and the label life — not by the laser.
| If this is your situation | Start with | Because |
|---|---|---|
| Squeezable bottle, curved surface | UV0201W21 — 36 mic BOPP | BOPP conforms; PET at this thickness fights the squeeze and lifts at the edges |
| Clear container, no-label look | UV0401W21 — 80 mic transparent BOPP | Thicker clear film keeps the cut edge from clouding under the beam |
| Chemical or heat exposure after labelling | FL0301W21 — 60 mic PET with 135 gsm liner | PET tolerates heat and solvents; the heavier liner gives a wider power window |
| Very tight radius, thin label | LJ0401W21 — 25 mic PET | Lowest bending stiffness in the range; less memory, less edge lift |
| Paper look, offset printed sheets | OF0107W21 — gloss white PET sheet | Sheet format matches offset workflow; film survives the beam better than paper |
| Matte premium look, dark bottle | UV0301W21 — matte white BOPP | Matte hides the slight edge discolouration that gloss makes obvious |
These are the recurring problems reported by converters running laser finishing. We do not publish laser recipes — the correct power, speed and frequency depend on your laser type, lens, focal distance and extraction, and a number copied from another factory is worse than no number at all. What we can do is tell you which material variable to change.
Symptom: release paper shows a line of cut dots, labels pre-release on the rewinder, or the web snaps at the slitter. Cause: liner too light or too porous for the energy needed to clear the facestock — most often a 54 gsm glassine paired with a film facestock. Fix: move up to a 60–80 gsm glassine or a PET film liner before touching the power setting.
Symptom: a visible scorched rim, worse on one side of the web. Cause: the beam is over-powered to clear an unevenly coated paper surface, so the coating absorbs the excess and chars. Fix: switch to a cast-coated paper with a uniform coat, or accept a film facestock, and raise speed rather than lowering power alone.
Symptom: the cut edge turns milky or forms a small lip. Cause: too much dwell time — the film melts instead of vaporising. Fix: reduce power and add passes, or move to a thicker clear film such as the 80 mic UV0401W21, which tolerates the same energy with less local melting.
Symptom: cut quality drops over weeks, service engineer finds film on the lens. Cause: PVC in the beam path. Fix: remove PVC from the laser line entirely. This is a machine health issue, not a label quality issue, and it does not show up in the first week.
The kerf is surrounded by a narrow heat-affected zone. On a permanent acrylic adhesive this usually shows up as a slightly harder edge with reduced initial tack in the first 24 hours, which recovers as the adhesive re-flows. On a removable or freezer-grade adhesive the edge matters more: an over-heated edge can lose its clean-release behaviour and leave residue on the container.
If your application is a removable promotion label or a cold-chain label, say so when you request samples. We will send the removable and freezer constructions alongside the permanent ones so you can run them on your own machine before committing to a production order.
Most laser trials fail for procedural reasons before the material is ever the problem. Three variables get changed between runs, the cut is judged two minutes after it leaves the beam, and the second roll arrives with a coat weight that differs from the first. A trial that moves one variable at a time takes an afternoon and produces a result you can write on a purchase order.
Work in this order. Each step narrows what the next one is allowed to be.
Run the same facestock on two liner weights: the 60 gsm white glassine that most of our film constructions come on, and a 135 gsm liner such as the one on FL0301W21. The heavier liner widens the window in which the beam clears the adhesive without marking the release surface. If both pass, keep the lighter one — it costs less and rewinds tighter. If only the heavy liner passes, the 60 gsm sheet was the real constraint and no power setting will fix that.
Only now compare facestocks, and only at the liner setting that already passed. Paper, BOPP and PET behave differently in the kerf, and matte BOPP hides edge discolouration that gloss makes obvious. Judge the edge rather than the label face: hold the cut under raking light and look for a raised lip, a milky band on clear film, or a brown rim on paper.
When the cut is marginal, raising line speed shortens the dwell time per unit length and is easier to control than walking power down in small increments. Lowering power on its own tends to leave the adhesive uncut at the outer edges of the web, where focus falls off; speed keeps energy density more even across the width. This is why two machines with the same nominal power can need different settings for the same roll.
An acrylic adhesive that has just been through a beam reads harder at the cut edge than it will 24 hours later, because the adhesive re-flows. A permanent label that feels tack-free at the rim on the day of the trial may be entirely normal the next day — and the reverse mistake is more expensive: a removable or freezer-grade adhesive that has lost clean release at the edge will not recover. Keep the trial labels overnight and re-check before you conclude anything about the material.
A trial run on one roll tells you about that roll. Coat weight varies between production batches within the tolerance on the data sheet, and a laser is sensitive to that variation in a way a rotary die is not. If a construction passed on a sample and then misbehaves on a production roll, check the liner batch and the coat weight before you change any machine setting — and ask us for the TDS of the actual batch you received.
Answered by the coating and conversion team, not by marketing.
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