| 摘要 |
PURPOSE:To improve cushion properties without the use of an adhesive agent and to simplify a process to perform a monolithical uniting, by a method wherein a plural number of sheet materials is laminated, and they are welded together in a dot manner along the side edge part to unite then monolithically. CONSTITUTION:In case, for example, a sheet material 6 consisting of leather, a sheet material 7, such as slab urethane, having cushion properties, and a sheet 8 consisting of a fabtic backing are laminated and united into a monolithical unity to form a skin material 2, a rodform output member 20, of which an ultrasonic welder consists, makes contact with a part positioned inward by DELTAl from a longitudinal side edge part m of a laminate 14 consisting of the sheets 6-8 to form welded parts 21 in a dot manner to unite them monolithically. A stock S, having the part 21 welded in a dot manner, is cut at parts (a) to form a stock So, and the stock So is cut to a given length to form a skin material 2. The side edge part m of the skin material 2 is folded inward, and the said part and the outer skin materials 3, 3 are sewed together through the medium of beadings 22 to form a bagform skin material for seat. |
