Liner?

The liner is the backing paper you peel off and throw away. It is the most invisible component of any label, and one of the most engineered.

A good liner does five things at once: it protects the adhesive during shipping; it lets the label die-cut cleanly without through-cutting; it lays flat enough to feed through a laser printer at 200 °C without curling; it releases the label at a consistent force; and it is cheap enough to be discarded. Most label failures in production trace to the liner, not the face.

Glassine paper — the default. Smooth, dense paper coated with a silicone release layer. Yellow or beige in colour. Excellent for inkjet, laser and hand-application. Approximately 95% of consumer sheet labels use glassine.

Kraft paper — thicker, brown, common on roll labels for thermal and flexographic printing. Stronger but less smooth than glassine.

PET film liner — transparent, ultra-stable, used for precision die-cut labels (electronics, medical, automotive). Survives high-heat lamination and roll-to-roll automation. 3–4× the cost of glassine.

BG (Blue Glassine) — coloured liner to make the labels easier to spot in production. Functionally identical to standard glassine, with branding overhead.

Laser printers apply 200 °C fuser heat. Cheap liners curl, jam, or release prematurely. Specify a laser-grade liner if the sheets will run through a HP LaserJet or Canon ImageRunner.

Inkjet printers are gentler but still benefit from a stable liner. Most consumer sheet labels (Avery, OnlineLabels, our sheet stock) are explicitly designed for inkjet.

Thermal printers (Zebra, Brother QL) use roll-form labels. The liner needs to feed cleanly through the printer’s drive roller and tear cleanly at the peel bar. Specify thermal-grade kraft or glassine.

Die-cutting requires a liner that holds together at the kiss-cut depth. PET is the best choice for tight registration; standard glassine is fine for general sticker work.

Silicone-coated liners are not currently recyclable in most municipal paper streams. The silicone contaminates the pulping process.

A growing share of premium label production uses linerless technology — the back of the label itself is non-stick, eliminating the discarded liner. Most thermal carrier labels (parcel shipping) are now linerless.

For sheet labels, the only meaningful sustainability improvement today is to reduce coat weight — thinner liner, less waste — or to recycle the spent liners through a specialised programme.