liner

The backing or “liner” is a part of self-adhesive label material or adhesive transfer tape. Can be made of paper or plastic. Protects the adhesive until it is applied to the surface for final use. Provides support for face material during the die cutting process. Allows to pull labels through the printer and applicator for peeling. Sometimes in double-sided adhesive tapes the carrier on which adhesive is applied on both sides is called so.