ENTRY SHEET FOR DRILLING AND DRILLING METHOD

摘要

Provided is an entry sheet for forming a drill hole, the sheet having superior hole-positioning precision and ability to limit drill bit breakage and less winding of swarf onto the drill bit compared to prior entry sheets for forming drill holes. Said drill hole entry sheet is provided with a metal support foil and a layer obtained from a resin composition that is formed on at least one surface of said metal support foil. The resin composition comprises a cellulose derivative (A) and a water-soluble resin (B). The cellulose derivative (A) is obtained from a hydroxyalkyl cellulose and/or a carboxyalkyl cellulose having a weight average molecular weight of 20,000-350,000. With respect to 100 parts by mass of the resin composition, the content of the cellulose derivative (A) is 5-40 parts by mass and the content of the water-soluble resin (B) is 60-95 parts by mass.