Patent ID: 7175728

Claim:
A method of separating and recovering cut workpieces, comprising applying a heat-peelable adhesive sheet to an adherend to be cut into workpieces, cutting the adherend into workpieces, and separating and recovering the cut workpieces, wherein the heat-peelable sheet comprises a substrate and, formed on at least one side thereof, a heat-expandable layer containing heat-expandable microspheres and an adhesive comprising an adhesive substance, the heat-expandable layer being located between the substrate of the heat-peelable adhesive sheet and the adhesive layer, the substrate of the heat-peelable adhesive sheet having heat resistance, stretchability and a tensile elongation at break of about 250% or higher, and the substrate of the heat-peelable adhesive sheet comprising a substrate material selected from the group consisting of a flexible vinyl chloride film containing a heat stabilizer, a stretchabl polyester film, a rubber polymer film and a multilayered film comprising any of said substrate materials.