Spherical sealing body used for the exhaust pipe joints and a method of manufacturing thereof

A method of manufacturing a spherical sealing body for use in exhaust pipe joints, comprising the steps of;

• laminating a first flexible refractory sheet and a flexible wire net to each other,
• winding said laminated first refractory sheet and said wire net such that said wire net is situated at the outermost circumference to thereby form a cylindrical member,
• laminating a second flexible refractory sheet and an unsintered tape or film made of a polytetrafluoroethylene resin to each other,
• compressing to integrate said laminated second refractory sheet and said unsintered tape or film in a direction of the thickness thereof to thereby form a sliding face member,
• winding said sliding face member to an outer circumferential surface of said cylindrical member such that said unsintered tape or film is situated to an outside to thereby form a cylindrical preform body, and
• applying compression to said preform body in an axial direction of said preform body so as to form a main body of said sealing body by entangling to integrate said first refractory sheet and said wire net and so as to form a surface layer made of said resin to a spherical portion of said main body by integrating said cylindrical member with said sliding face member.