PRESSURE FILM, AIR SPRING AND PIPE JOINT

摘要

PROBLEM TO BE SOLVED: To provide a pressure film having a relatively large cross section of steel materials, hard to be deformed at the time of vulcanization, and significantly reducing pressure fluctuation or a seal leak caused by the deformation of a bead wire with few man-hours, and also to provide an air spring or a pipe joint provided with the pressure film. SOLUTION: This pressure film is provided with bead rings 13 containing a plurality of steel core materials covered with rubber on both ends and cylindrical rubber layers 2a, 2b covering and connecting the bead rings 13. The pressure film which the steel core material constituting the bead rings 13 are formed in a belt-shape. The air spring or pipe joint is provided with the pressure film. COPYRIGHT: (C)2004,JPO