초록 ▼

A tubular lining material and a method and apparatus for manufacturing same, the tubular lining material being suitable for reinforcing pipe lines and comprising a tubular textile jacket having on the external surface thereof a coating of plural synthetic resins in the form of laminated layers, char

A tubular lining material and a method and apparatus for manufacturing same, the tubular lining material being suitable for reinforcing pipe lines and comprising a tubular textile jacket having on the external surface thereof a coating of plural synthetic resins in the form of laminated layers, characterized in that the outermost layer of the coating is composed exclusively or predominantly of a thermoplastic polyester elastic resin and the innermost layer of the coating is composed exclusively or predominantly of a thermoplastic polyurethane elastic resin, the coating having been bonded superificially onto the external surface of the tubular textile jacket. The tubular lining material is manufactured by simultaneously extruding plural synthetic resins in an annularly layered form superficially onto the external surface of the tubular textile jacket, using an apparatus provided with an annularly arranged multiple extruders. The tubular lining material is significantly improved in flexibility and adhesion to the tubular textile jacket.

대표청구항 ▼

An apparatus for coating a tubular textile jacket in the manufacturing of a tubular lining material for pipe lines which comprises an annular extrusion head having multiple extruders each with a downwardly opened annular nozzle at the lower end thereof, each extruder communicating with said correspo

An apparatus for coating a tubular textile jacket in the manufacturing of a tubular lining material for pipe lines which comprises an annular extrusion head having multiple extruders each with a downwardly opened annular nozzle at the lower end thereof, each extruder communicating with said corresponding nozzle through concentric annular passages capable of simultaneous extruding plural, separately distinct synthetic resins annularly in the form of laminated layers on the external surface of a tubular textile jacket, a mandrel located on the central axis of said apparatus, spaced from said annular nozzles, which has an outer diameter substantially equal to or slightly smaller than the inner diameter of said tubular textile jacket, a means for evacuating the interior of said tubular textile jacket downstream of said mandrel said evacuation means including a hollow shaft extending through said mandrel, a lower end portion of said shaft extending downward beyond said mandrel having formed therein at least one hole for communicating between the interior of said tubular textile jacket and the interior of said hollow shaft, and at least one disc laterally mounted on said lower end portion of said shaft to maintain said tubular textile jacket in an inflated condition, said mandrel and said at least one disc defining an evacuated space therebetween, the interior of said hollow shaft communicating with a vacuum source located at an upstream section of said annular extrusion head, means for solidifying said synthetic resins in the form of said laminated layers coated on said tubular textile jacket and means for introducing said tubular jacket to and withdrawing said laminated tubular jacket from said manufacturing apparatus.