CYLINDRICAL FILM JOINED BODY BY RING-SHAPED FUSION AND DEAERATOR USING THE JOINED BODY

摘要

PROBLEM TO BE SOLVED: To provide a cylindrical film joined body by ring shaped fusion which is used to increase mechanical strength in the vicinity of the joint between an envelope-shaped membrane structure for deaeration and a member for exhaust without lowering aeration performance. SOLUTION: In this cylindrical film joined body, the end part of a cylindrical film A(1) of a thermoplastic resin and the end part of another cylindrical film B(2) of a thermoplastic resin are overlapped and heat fused in a ring shape. In a deaerator using an envelope shaped membrane structure for deaeration, the membrane structure is formed from a cylindrical film joined body in which the end part of the cylindrical film connected with a member for exhaust and the end part of the cylindrical film unconnected with the member for exhaust are overlapped and heat-fused in a ring shape.