METHOD FOR PRODUCING SHEET JOINED BODY, SHEET JOINED BODY, ROLL BODY, OPTICAL FILM, AND POLARIZATION FILM

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a sheet joined body that can reduce the difference in level of at least a joint part, and can easily produce a sheet joined body by mutually joining sheet members without using a light absorber.SOLUTION: The method for producing the sheet joined body includes steps of: butting end faces of the sheet members each other;abutting the butted part with a light absorption member with light absorption property with respect to the wavelength of a laser to be used; irradiating the light absorption member with a laser beam so as to be heated so that the end faces of the sheet members are thermally welded with each other; and peeling off the butted part from the light absorption member to obtain the sheet joined body. In the irradiation, the butted part is irradiated with a laser beam, and the laser beam passing through the butted part is used to irradiate the light absorption member.