WORK SUBJECT MATERIAL, SURFACE PROTECTION SHEET AND METHOD OF WORKING

摘要

A work subject material (W) comprising a metal plate for use in punching and/or curving work and, attached thereto, a surface protection sheet, characterized in that the surface protection sheet comprises a support base material and, superimposed on one major surface thereof, an adhesive layer and exhibits, as calculated by the following formulae, coefficient (I) of = 21.0, coefficient (II) of = 4.0 and coefficient (III) of = 1.5: (I) = thickness of support base material (mm) × elongation at break of surface protection sheet (%), (II) = thickness of support base material (mm) × strength at break of surface protection sheet (N/20 mm), and (III) = coefficient (I)/coefficient (II).