ENTRY SHEET FOR DRILLING USE

摘要

The present invention relates to an entry sheet for drilling use, which can exhibit excellent hole location accuracy even when transported at ambient temperature for a long time and/or when stored under a thermal environment having a higher temperature than in Japan. More specifically, the present invention relates to an entry sheet for drilling a laminated board or a multi-layered board, which is characterized by comprising a metallic support foil and a layer of a water-soluble resin composition (also referred to as a water-soluble resin composition layer) formed on at least one surface of the metallic support foil and comprising a water-soluble resin, a water-soluble lubricant and a linear unsaturated fatty acid salt, wherein the water-soluble resin composition layer is formed by cooling from a cooling start temperature of 120 to 160�C to a cooling end temperature of 25 to 40�C over 60 seconds or shorter at a cooling rate of 1.5�C/sec or more, the degree of crystallinity of the water-soluble resin composition is 1.2 or more, the standard deviation (s) of the surface hardness of the water-soluble resin composition layer is 2 or less, and the surface hardness of the water-soluble resin composition layer is 8.5 to 25 N/mm2 inclusive.