METHOD FOR VACUUM FORMING

摘要

PROBLEM TO BE SOLVED: To provide a method for vacuum forming which enables easily forming an under-cut portion of a vacuum molding corresponding to an under-cut portion of an insert part into the same shape of the under-cut portion of the insert part. SOLUTION: The vacuum forming method for embedding an insert part 1 having an under-cut 1c in a direction of vacuum suction in a molded item includes a process of arranging in advance an air permeable sheet 6 composed of a non-woven fabric, a Japanese paper or the like on a vertical wall portion 1a forming the under-cut 1c of the insert part.