Roll film, method for producing roll film, method for producing copper-clad laminate and method for producing printed board

A method for producing a roll film, the method comprising

• subjecting a film comprising a melt-processable fluororesin as the main component and having a thickness of from 1 to 100 μm to annealing treatment at from a temperature lower by 210° C. than the melting temperature (Tm) of the melt-processable fluororesin to a temperature lower by 20° C. than Tm and then winding the film,
• wherein the roll film comprises a melt-processable fluororesin as the main component, has a thickness of from 1 to 100 μm, and has a dimensional change rate of less than 1.0% , in terms of an absolute value, in each of MD and TD, when heated at 150° C. for 30 minutes and then cooled to 25° C., based on the dimension at 25° C.