Patent ID: 8241437

Claim:
A metal sheet rolling method of rolling a metal sheet with a pair of rolls, the metal sheet rolling method mutually differentiating between frictions of respective interfaces between the pair of rolls and the metal sheet and lubricating at least one of the interfaces by a procedure other than lubrication by coating of a liquid lubricant agent, wherein an upper interface-lower interface differential static friction coefficient D is not less 0.15, the upper interface-lower interface differential static friction coefficient being specified as the neater between an absolute value |p| of a difference ‘p’ by subtraction of a static friction coefficient of a lower surface of the metal sheet from a static friction coefficient of an upper surface of the metal sheet and an absolute value |q| of a difference ‘q’ by subtraction of a static friction coefficient of a lower roll from a static friction coefficient of an upper roll of the pair of rolls, where the static friction coefficient represents a coefficient of static friction to a predetermined material.