Kiss Cutting: Why a Sticker Stays on the Sheet Until Someone Peels It

A sheet of stickers looks like it was punched out of one piece of paper. It was not. The labels are still attached to the backing, and that is the whole point of a kiss cut.

A kiss cut is a die cut that goes through the face material and the adhesive but stops at the release liner. The label stays on the liner, the liner stays whole, and the sheet can run through a printer, a laminator or a mail slot without falling apart. A through cut goes through every layer, so the label and the liner separate. Many label jobs use both cuts on the same sheet: the label outline is a kiss cut, the outer edge of the sheet is a through cut.

Where the blade stops

The liner is usually 60 to 90 gsm glassine or a PET film, and the cut has to land inside a window measured in hundredths of a millimetre. Too shallow and the face material does not separate: the label tears, or the user lifts the top layer and leaves a ragged band of adhesive behind. Too deep and the blade scores the liner, which then splits when the sheet is bent or a label is peeled. On a roll, a scored liner can break on the press and stop the run.

Adhesive changes the setting

A water-based acrylic adhesive cuts differently from hot melt rubber. Hot melt is softer and tends to flow back around the blade, so the pressure that gives a clean cut in acrylic can leave a bridged edge in hot melt. Cold makes adhesive stiffer. A job cut in an unheated warehouse in January may need a different pressure setting from the same job in July.

What to check on a sample

Peel a corner of one label. The liner underneath should show a faint line, not a cut. Bend the sheet: if the liner cracks along the label edge, the cut is too deep. Look at the waste matrix, the material removed around the labels, for fibres or stretched adhesive, which point to a dull blade or too much pressure.

Kiss cutting is a small step with a large effect on how a label behaves in a customer's hands. The cut has to be deep enough to release and shallow enough to hold, and that window is set by the liner, the adhesive and the temperature of the room.