The invention relates to a method of producing an unbonded flexible pipe and an unbonded flexible pipe. The method comprises providing an innermost sealing sheath defining a bore and a longitudinal axis, and a pressure armor layer surrounding the innermost sealing sheath. The pressure armor layer comprises at least one helically wound elongate armor element with at least one helical armor element gap between windings thereof, and the method comprises providing a foundation layer for the pressure armor layer. The foundation layer is provided with at least one helically shaped groove, and the elongate armor element is applied in the helically shaped groove, preferably such that the foundation layer at least partly fills the helical armor element gap, the foundation layer is preferably a fluid permeable foundation layer.

A breathing circuit component includes an inlet, an outlet and an enclosing wall. The enclosing wall defines a gases passageway between the inlet and the outlet. At least a region of the enclosing wall is formed from a breathable material that allows the passage of water vapor without allowing the passage of liquid water or respiratory gases. The breathing circuit component may be the expiratory limb of a breathing circuit.

A method for producing a high-pressure tank capable of winding a reinforcing fiber bundle around a liner without deteriorating tank performance. The method for producing a high-pressure tank by winding a resin-impregnated strip-shaped reinforcing fiber bundle around a rotating liner so as to form a fiber-reinforced resin layer on the outer surface of the liner includes while winding the strip-shaped reinforcing fiber bundle around the liner, concurrently winding another bundle of fibers narrower than the strip-shaped reinforcing fiber bundle around the liner so as to cross the strip-shaped reinforcing fiber bundle.

A multistage filament winding process for manufacturing a composite article using a dual chemistry formulation including the steps of (a) providing a dual chemistry formulation containing components to effectuate dual cure of the formulation; (b) winding fibers on a liner or on a mandrel; (c) impregnating the wound fibers of step (b) with the dual chemistry formulation; (d) activating a first reaction (A) by UV or thermal-free radical initiation sufficient to form first macroscopic gels and to allow the first macroscopic gels to phase separate from the remaining substantially unreacted components in the formulation; (e) optionally, activating a second reaction by heating through IR lamps or other heating apparatus and controlling the second reaction sufficient to form second macroscopic gels subsequent to the formation of the first macroscopic gels which have gelled and phase separated in the formulation; (f) repeating steps (a)-(d) until a composite article having a predetermined thickness is formed; and (g) heating the formed composite article of step (f) sufficient to form a final composite article product having a predetermined glass transition temperature; a cured thermoset article prepared by the above process; and a process for manufacturing spoolable pipe.

A multistage filament winding process for manufacturing a composite article using a dual chemistry formulation including the steps of (a) providing a dual chemistry formulation containing components to effectuate dual cure of the formulation; (b) winding fibers on a liner or on a mandrel; (c) impregnating the wound fibers of step (b) with the dual chemistry formulation; (d) activating a first reaction (A) by UV or thermal-free radical initiation sufficient to form first macroscopic gels and to allow the first macroscopic gels to phase separate from the remaining substantially unreacted components in the formulation; (e) optionally, activating a second reaction by heating through IR lamps or other heating apparatus and controlling the second reaction sufficient to form second macroscopic gels subsequent to the formation of the first macroscopic gels which have gelled and phase separated in the formulation; (f) repeating steps (a)-(d) until a composite article having a predetermined thickness is formed; and (g) heating the formed composite article of step (f) sufficient to form a final composite article product having a predetermined glass transition temperature; a cured thermoset article prepared by the above process; and a process for manufacturing spoolable pipe.

A system is provided for producing components of composite material, and especially elongate or continuous components of fiber-reinforced polymer. The system comprises a winding mechanism for winding an elongate sheet of composite material about a winding axis that is at an angle to a perpendicular to a longitudinal axis of the elongate sheet so as to form a helical coil of wound sheet a mechanism is provided for drawing or conveying the helical coil of wound sheet along a process path, wherein the process path is preferably substantially parallel to the winding axis. A shaping mechanism forms or shapes the coil of wound sheet as it is drawn or conveyed along the process path. A corresponding method of producing a composite component is provided.

A manufacturing method for manufacturing a reinforced layer constituting a high-pressure tank includes: a first forming step of forming a cylindrical pipe portion and extending in an axial direction of the high-pressure tank, the pipe portion including a first end portion including a first end and a second end portion including a second end, the pipe portion being formed to have a first stepped portion such that the first stepped portion projects outwardly at a position distanced from the first end in the axial direction by a first distance; a first placing step of placing the first end inside a first dome portion by moving at least either of the first dome portion and the pipe portion until a first bottom end portion of the first dome portion abuts with the first stepped portion; and a first joining step of joining the pipe portion to the first dome portion.

A manufacturing method for manufacturing a tank includes: a step of forming a structural body constituted by a liner and a fiber reinforced resin layer placed on the outer periphery of the liner, the structural body including a cylindrical portion and dome portions provided in opposite ends of the cylindrical portion in the axial direction of the cylindrical portion; a step of winding a heat insulating sheet around the fiber reinforced resin layer after the step of forming the structural body, the heat insulating sheet having notches in dome forming portions provided to correspond to the dome portions; and a step of covering the dome portions with the dome forming portions.

A thin ribbon spirally wound polymer conduit and method of forming, wherein a helical reinforcing bead is interposed adjacent overlapping layers of ribbon. Further, a method of continuously forming spirally wound conduit wherein a sacrificial layer, preferably having a different base polymer to that of the conduit, is first applied to the former before the conduit is formed overtop.

Polymeric composite stents reinforced with fibers for implantation into a bodily lumen are disclosed.