PREPARATION OF SHEET-LIKE ARTICLE

摘要

PROBLEM TO BE SOLVED: To obtain a sheet-like article with a more uniform specified thickness by grasping more precisely reasons of fluctuation and surge of the thickness of the sheet-like article for coping with a more severe requirement of accuracy of controlling the thickness. SOLUTION: In a method for preparing a sheet-like article wherein a resin is extruded into the sheet-like article from a nozzle 1 and wound after molding, a thickness meter for measuring thickness in the longitudinal direction of the sheet-like article is provided and fluctuation of the measured value of the thickness in the longitudinal direction of the sheet-like article by means of the thickness meter is FFT-analyzed.