| 摘要 |
PURPOSE: Lubricant sheet for making hole and method of making hole with drill are provided to effectively prevent heat generation of a drill bit and free from stickiness. CONSTITUTION: A lubricant sheet for making a hole used for a printed circuit board, comprises an organic substance layer having a thickness of 0.02 to 3.0 mm and formed of a mixture(a) or a mixture(b) and a metal foil having a thickness of 0.05 to 0.5 mm, the organic substance layer being formed on one surface of the metal foil, the mixture(a) being a mixture containing 20 to 90 parts by weight of polyether ester(I), 10 to 80 parts by weight of a solid water-soluble lubricant(II), the total amount of the polyether ester(I) and the solid water-soluble lubricant(II) being 100 parts by weight, and 2 to 10 parts by weight of polyethylene glycol(III) having a number average molecular weight of 200 to 600, and the mixture(b) being a mixture containing 20 to 90 parts by weight of the polyether ester(I), 10 to 80 parts by weight of the solid water-soluble lubricant(II), the total amount of the polyether ester(I) and the solid water-soluble lubricant(II) being 100 parts by weight, and 2 to 20 parts by weight of a liquid water-soluble lubricant(IV), and a method of making a hole which uses the lubricant sheet. |
