Method for manufacturing supple reinforced pipe involves forming two knittings having mesh lines forming angle a with same absolute values, but opposite signs so that rotation forces cancel each other

摘要

After forming inner envelope, two knittings (4, 5) are formed around inner envelope. Knittings have same mesh but directed in opposite directions, and comprise mesh columns extending in direction D, parallel to longitudinal axis (6) of pipe. Mesh lines (2) form angle a having same absolute values, but with opposite signs so that rotation forces developed by each knitting cancel each other. Outer envelope is formed around two knittings. Angle a is angle defined between mesh line and axis perpendicular to direction D, and has value ranging between 5 and 40 degrees. An Independent claim is also included for the supple reinforced pipe.