Abstract: A composite strip 10 windable to form a helical pipe is disclosed. The composite strip 10 comprises: an elongate plastic strip 11 having a base portion 12 and at least one lengthwise extending rib portion 20 upstanding from the base portion 12; and an elongate reinforcing strip 30 extending lengthwise and supported laterally by the rib portion 20, the reinforcing strip 30 having a height to thickness ratio of at least three to one and orientated substantially perpendicular to the base portion 12. When wound into a helical pipe, the reinforcing strip 30 reinforces the pipe against radial crushing loads. A bead 40 seals the reinforcing strip 30 from the environment. Desirably the composite strip 10 further comprises: a planar lamina 50 extending lengthwise and bonded to the base portion 12, the lamina 50 having a higher Young's modulus and strength than those of the plastic strip 11. The lamina 50 greatly improves the pressure rating of a pipe wound from the strip 10.

Abstract: A flexible method that includes a tubular member defining a longitudinal passage adapted to contain a conveyed fluid, and a plurality of layers of flexible material helically wrapped around the tubular member.

Abstract: A structural lining system and a method of applying the system to the interior surface of a pipe. First, a layer of adhesive is sprayed onto the interior surface of a previously cleaned pipe. Next, strips of previously coiled unidirectional carbon fiber material are allowed to uncoil within the pipe so that side edges of the strips abut the side edges of adjacent strips and the junction where the ends of each strip come together are staggered around the pipe so that the junction for adjacent strips do not align longitudinally. If ends of the strips overlap, additional adhesive is applied between the overlapping portions. A final epoxy coating is sprayed over the strips, forming an internal liner for the pipe.

Abstract: A flexible hose which has a hose body made of soft synthetic resin, a reinforcement made of hard synthetic resin wound spirally and joined to the hose body by fusion, and a conductor arranged inside the reinforcement in its longitudinal direction. The conductor does not adhere to the reinforcement and is movable. The hose body is formed by: extruding a tube made of soft resin from a head of an extruder; pressing and flattening the tube to form a strip; and winding the strip spirally with the adjacent side edges joined together.

Abstract: A spoolable composite tube capable of being spooled onto a reel for storage and for use in oil field applications. The spoolable tube exhibits unique anistropic characteristics that provide improved burst and collapse pressures, increased tensile strength, compression strength, and load carrying capacity, while still remaining sufficiently bendable to be spooled onto a reel in an open bore configuration. The spoolable composite tube can include an inner liner, an interface layer, fiber composite layers, a pressure barrier layer, and an outer protective layer. The fiber composite layers can have a unique triaxial braid structure.

Abstract: A high-pressure composite pipe of the present invention comprises an inner layer pipe made of a synthetic resin, and a reinforcing layer formed by spirally winding a stretched polyolefin resin sheet on an external circumferential surface of the inner layer pipe. The synthetic resin for the inner layer pipe or a heat-sealable resin is filled into a gap defined by the stretched polyolefin resin sheet, thereby avoiding penetration of water from a cut surface of the pipe.

Abstract: Sound attenuating ducting has an inner, helical wire supporting an inner and outer layer formed by strips of a foamed thermoplastic rubber material. Axial and helical reinforcing yarns extend along the ducting between the layers. The two strips are applied from extruders, the extrusion rate of the inner strip being set to be less than that of the outer strip so that the inner strip is stretched to produce a more porous structure than in the outer strip. In this way, the inner layer is efficient in absorbing orifice noise within the ducting and the outer layer contains radiated noise.

Abstract: As the first object, the present invention intends to provide high-pressure composite pipes which show remarkable pressure resistance and optimum applicability in various uses and which can be economically manufactured in a light weight. To achieve this object, a high-pressure composite pipe of the present invention comprises a pipe-shaped inner layer made of a synthetic resin, a reinforcing layer made of a stretched polyolefin resin sheet and wound on an external circumferential surface of the inner layer, and an outer layer made of a synthetic resin and disposed on an external circumferential surface of the reinforcing layer. The winding direction of the reinforcing layer is oriented at a predetermined angle relative to the axis of the pipe. Between the inner layer and the reinforcing layer and between the outer layer and the reinforcing layer, adhesion layers having affinity to these layers are interposed.

Abstract: A flexible method that includes a tubular member defining a longitudinal passage adapted to contain a conveyed fluid, and a plurality of layers of flexible material helically wrapped around the tubular member.

Abstract: A high-pressure composite pipe of the present invention comprises an inner layer pipe made of a synthetic resin, and a reinforcing layer formed by spirally winding a stretched polyolefin resin sheet on an external circumferential surface of the inner layer pipe. The synthetic resin for the inner layer pipe or a heat-sealable resin is filled into a gap defined by the stretched polyolefin resin sheet, thereby avoiding penetration of water from a cut surface of the pipe.

Abstract: A flexible armored pipe, which comprises an inner liner, which is surrounded by a pressure armor, is built up by the joining together of profiles, which have a number of recesses. According to the invention, the profiles are configured as K-profiles (10, 16, 17), which have recesses (10a, 10b, 10c, 10d), which are arranged in adjoining surfaces of the profile. When the profiles are brought together, the recesses form a cavity in which a locking element (12, 14, 18) can be inserted, the function of which is to prevent displacement of the K-profiles at right-angles to the axial direction of the pipe when this is exposed to axial, compressive forces. The locking element can be I-shaped (14), be circular or be configured as a wire (18) with a C-shaped cross-section. The locking element can also be made either of a rigid or an elastic, deformable material. With a C-shaped locking element, the whole of the cavity, which is formed by the recesses, is not filled out.

Abstract: A spoolable composite tube capable of being spooled onto a reel for storage and for use in oil field applications. The spoolable tube exhibits unique anistropic characteristics that provide improved burst and collapse pressures, increased tensile strength, compression strength, and load carrying capacity, while still remaining sufficiently bendable to be spooled onto a reel in an open bore configuration. The spoolable composite tube can include an inner liner, an interface layer, fiber composite layers, a pressure barrier layer, and an outer protective layer. The fiber composite layers can have a unique triaxial braid structure.

Abstract: A flexible protective sleeve (10; 32 to 37) comprises a supporting layer (11) formed from a strip (12) which has the general shape of a helix having a gap (14) between successive turns thereof. The sleeve (10; 32 to 37) also comprises a bridging layer (16) which is supported by said supporting layer (11) and bridges said gap (14). The bridging layer (16) is formed from flexible sheet material (18; 48) which is arranged to deform to allow said gap (14) to locally change in width to accommodate deformations of the sleeve.

Abstract: A method of fabricating paperboard cores, and the paperboard cores so fabricated, have improved chuck strength and can be used with chucks rotating at a speed of at least 200 mm/min., even with paper rolls having a weight of over 8.5 tons. A plurality of paperboard plies (e.g. made by press drying) are wound spirally around a mandrel into a tube to produce a paperboard core having a cylindrical surface and inside diameter and a wall thickness of 10 mm or more.

Abstract: A flexible pipe formed by multiple layers of different materials, and one or more vent passages are provided in one of the layers for venting any gases permeating through the pipe.

Abstract: A method is intended for the thermal insulation of a flexible pipe. The method includes a first step of depositing a thickness of extrudable and rigid insulating material on an outer surface of the pipe, with the pipe moving longitudinally. The insulating material is cooled over a substantially rectilinear part downstream from the deposition area. Then, at least one circumferential slot is formed in the thickness of the rigid insulating material so as to restore flexibility of the pipe coated with the rigid insulating material. The thus-formed pipe includes a flexible inner pipe, a layer of rigid insulating material surrounding the flexible pipe, and at least one circumferential slot cut in the layer of rigid insulating material to allow flex of the heated insulated pipe.

Abstract: This invention relates to flexible tubular conduits or pipes particularly in situations where the conduits need to withstand relatively high pressures. In such cases, the conduits are reinforced by helically wound armor which is compliant in flexure, and profiled to allow each subsequent turn to interlock with the previous turn.

Abstract: A drain hose that connects to the movable roof of a petroleum storage tank. The hose extends downwardly through the material stored in the tank and to a discharge at the lower portion of the tank. The hose is comprised of (a) an inner stainless steel tube(or hose) having a stainless steel over-braid and (b) a spirally wound outer tube (or hose) also of stainless steel. The inner hose is connected to flanges that have ferrules extending therefrom. The outer protective hose is captured in a free floating manner by the ferrules such that the outer hose is allowed to move along or slide over the inner hose without escaping the end ferrules.

Abstract: A tubular extruded member particularly suitable for use in medical devices such as intravascular catheters and guide wires, wherein the extruded tubular member includes multiple layers having biaxial helical orientation in different directions. A counter-rotation extrusion process may be used to orient the layers in different biaxial helical directions. The counter-rotation extrusion process provides orientation in two different circumferential directions in addition to a longitudinal direction. By combining the dual direction or biaxial helical orientation with multiple layers, different layers of the tubular member may be tailored to have the desired mechanical properties.

Abstract: A spoolable composite tube capable of being spooled onto a reel for storage and for use in oil field applications. The spoolable tube exhibits unique anistropic characteristics that provide improved burst and collapse pressures, increased tensile strength, compression strength, and load carrying capacity, while still remaining sufficiently bendable to be spooled onto a reel in an open bore configuration. The spoolable composite tube can include an inner liner, an interface layer, fiber composite layers, a pressure barrier layer, and an outer protective layer. The fiber composite layers can have a unique triaxial braid structure.

Abstract: A flexible pipe formed by multiple layers of different materials, one of which has a vent passage.

Abstract: An extruded multilayer plastic pipe is provided. The pipe comprises an inner layer, an outer layer and an intermediate layer. Each of the inner and outer layers is comprised of a thermoplastic material. The intermediate layer consists essentially of a lower density material than said inner and outer layers, and the intermediate layer is situated between and abuts both the inner layer and the outer layer. At least one of the inner, outer and intermediate layers consists of reinforced solid or foamed reprocessed plastic.

Abstract: A flexible tube having a construction in which a coil of metal is coated with a film of resin. The flexible tube is manufactured by that resin is vapor-deposited on a peripheral face of a thermocontraction tube. a metal wire is wound on the tube as to be coiled, resin is vapor-deposited on the coil, and the thermocontraction tube is contracted by heating and drawn out.

Abstract: Composite flexible air ducting comprising an elongated inner lining of plastic reinforced by a spirally wound coil member providing an elongated continuous air passage; a layer of natural fiber insulation surrounding the inner lining and an outer sheath surrounding the layer of natural fiber insulation. The outer sheath and the layer of fiber insulation are bonded to each other by a layer of adhesive having substantial thermal insulating properties.

Abstract: The invention concerns a flexible tubular pipe comprising, from inside outwards, a web (1) made of interlocked steel strips, an inner impervious sheath (2) in polymer material, a short-stepped helical winding of interlocked forming wire (3) arranged above the internal sheath (2), at least a hoop (4) consisting of a short-stepped metal wire winding without interlock, at least a long-stepped tractive armouring layer (5) wound around the pressure vault and an outer polymer protective and sealing sheath (8); the sickness (Ef) of the hoop (4) is greater than the thickness (Ez) of the metal forming wire (3), preferably by one to three times.

Abstract: A flexible tube having high flexibility and high resistance to pressure and causing little twist and elongation when subjected to a high internal pressure. A flexible tube 21 has an inner tubular layer 11 made of a soft resin, an inner spiral reinforcement 1 made of a hard resin and helically wound around the inner tubular layer 11, an intermediate tubular layer 12 made of a soft resin and surrounding the inner spiral reinforcement 1, and an outer spiral reinforcement 4 made of a hard resin and helically wound around the intermediate tubular layer 12 in the direction opposite to the winding direction of the inner spiral reinforcement 1. As the direction of the helix of the inner and outer spiral reinforcements 1 and 4 are opposite to each other, forces due to internal pressure acting to twist the helixes are canceled out.

Abstract: A flexible pipe and a method of manufacturing same according to which the pipe is formed by multiple layers of different materials and suitable for use in subsea and land-based applications.

Abstract: A spoolable composite tube capable of being spooled onto a reel for storage and for use in oil field applications. The spoolable tube exhibits unique anisotropic characteristics that provide improved burst and collapse pressures, increased tensile strength, compression strength, and load carrying capacity, while still remaining sufficiently bendable to be spooled onto a reel in an open bore configuration. The spoolable composite tube can include an inner liner, an interface layer, fiber composite layers, a pressure barrier layer, and an outer protective layer. The fiber composite layers can have a unique triaxial braid structure.

Abstract: A flexible pipe (10) for high pressure is provided with a sublayer (11) made of natural or synthetic rubber or man-made polymers in general, and with a first and a second stiffening layer (12, 14), which are superimposed and both consist of a high-resistance metal spiral, whereby the spiral can have one or more wires. Between the first (12) and the second (14) layer there is interposed a skim coat (13) made of natural or synthetic rubber or man-made polymers in general. The flexible pipe (10) for high pressure is also coated with a coating (15) made of natural or synthetic rubber or man-made polymers in general.

Abstract: Composite paperboard container constructions, providing optimized axial crush strength, and related properties, are formed of one, two, or three structural paperboard plies that are arranged to form a layered body wall having a cross-section of the construction in the ordered structure, high compression strength paperboard layer\low compression strength paperboard layer\high compression strength paperboard layer. Preferably, the container body is formed of one or two structural plies and at least one structural ply is a multiple layer paperboard having both high compression strength and low compression strength paperboard layers.

Abstract: A spoolable composite tube capable of being spooled onto a reel for storage and for use in oil field applications. The spoolable tube exhibits unique anistropic characteristics that provide improved burst and collapse pressures, increased tensile strength, compression strength, and load carrying capacity, while still remaining sufficiently bendable to be spooled onto a reel in an open bore configuration. The spoolable composite tube can include an inner liner, an interface layer, fiber composite layers, a pressure barrier layer, and an outer protective layer. The fiber composite layers can have a unique triaxial braid structure.

Abstract: A spoolable composite tube capable of being spooled onto a reel for storage and for use in oil field applications. The spoolable tube exhibits unique anistropic characteristics that provide improved burst and collapse pressures, increased tensile strength, compression strength, and load carrying capacity, while still remaining sufficiently bendable to be spooled onto a reel in an open bore configuration. The spoolable composite tube can include an inner liner, an interface layer, fiber composite layers, a pressure barrier layer, and an outer protective layer. The fiber composite layers can have a unique triaxial braid structure.

Abstract: The invention relates to a method for manufacturing a pipe fitting, said method comprising manufacturing a preform (1) of plastic, and forming an additional layer (3) on top of it. According to the invention, the additional layer (3) is formed by winding a film on the preform until the desired total wall thickness is reached, and the film is wound using at the same time pretensioning in a desired direction. The invention further relates to a pipe fitting manufactured by this method.

Abstract: There is provided a sound-absorbing and a heat-insulating duct comprising a nonwoven cloth layer 1, a reinforcing core 2, a foam strip layer 3, a bonding resin 4 and resin-coating layer 5. The nonwoven cloth layer 1 is formed by wound spirally a nonwoven cloth 10 into a tube-like shape in which adjacent side edges of the adjacent nonwoven cloths 10 are brought in abutment against or lapped with each other so as to form a bonding portion 1a. The reinforcing core 2 made of hard synthetic resin material is wound spirally on the bonding portion 1a while a surface of the reinforcing core 2 being brought into contact with the nonwoven cloth 10 is welded or bonded to the nonwoven cloth 10. The foam strip layer 3 is formed by wound spirally a foam resin strip 30 having a width approximately equal to a width of the nonwoven cloth 10. Both adjacent edges 3a, 3b of the foam resin strip are disposed on adjacent reinforcing cores 2, 2 respectively.

Abstract: It is of the type having a thermal insulation structure placed around a central core (1) of longitudinal axis and it is characterized in that the thermal insulaton structure comprises at least one layer (3) consisting of separate solid strips (4), each strip being wound with a very long pitch and a maximum wind angle to the horizontal axis of less than 30°.

Abstract: A hose comprises a hose wall comprising a soft synthetic resin and a hard spiral reinforcement fused with or bonded to the hose wall for retaining the hose configuration. The hose wall comprises at least one layer of a chlorine-free thermoplastic elastomer such as a polystyrenic thermoplastic elastomer, a polyolefinic thermoplastic elastomer and a polyurethane-series thermoplastic elastomer. The reinforcement comprises a hard wire and a covering resin layer formed on the hard wire. The hose wall and the covering resin layer are formed with the same series elastomer. This hose is lighter and free from PVC resins, and has the same flexibility as that of the conventional PVC hoses.

Abstract: A double-walled spiral pipe in accordance with the present invention is composed of an outer wall 10 having a cylindrical shape, which is prepared by winding spirally a coated steel plate 11 having corrugations 12; and an inner wall 20 having a cylindrical shape, which is contacted with the wave bottom of corrugations of said outer wall 10, and can contracted or elongated depending upon a change of the pitch of the corrugations of said outer wall 10. The inner wall 20 having a cylindrical configuration is installed to be contacted with the wave bottom of corrugations of the outer wall 10, and functions to drain a sewage, etc. The inner wall 20 has a semi-circular portion which is formed at the point of the wave bottom of the corrugations of the outer wall, and a plane surface is formed between the semi-circular portions.

Abstract: There is provided a heat-insulating and noise reducing duct constituted by reinforcing core 1, a thick felt layer 2, a foamed resin strip layer 3 and a resin-coating layer 4. The reinforcing core 1 is made of hard polyolefin resin material and wound spirally at predetermined intervals. The thick felt layer 2 is wound spirally on an outer circumferential surface of the reinforcing core so that adjacent side edge portions of the felt layer 2 are lapped over or brought into contact with each other, while the shape of the felt layer is retained by the reinforcing core 1. The foamed resin strip layer 3 made of polyolefin resin material and wound spirally on an outer circumferential surface of the felt layer 2 so that adjacent side edge portions of the foamed resin strip layer 3 are in abutment against or in tight contact with each other. The resin-coating layer 4 provided to cover an outer circumferential surface of the foamed resin strip layer 3.

Abstract: A flexible duct and method for making the duct are disclosed. The duct includes an inner wall bonded to an outer wall, with a wire resilient helix and a scrim sandwiched therebetween. The scrim is in the form of a helical tape embedded between the outer wall and the inner wall, and preferably consists of a bonded yarn constructed in a layered or interwoven square or other uninterrupted geometrical pattern. The presence of the scrim provides the duct with high tensile strength and excellent tear resistance in all directions, especially in the helical direction. The method of manufacturing the duct includes the steps of helically forming the wire and scrim about the inner wall and bonding the outer wall to the inner wall to as to sandwich the helix and the scrim between the inner and outer walls.

Abstract: A reinforced multi-layer flexible tubing for use in fuel-line applications. An inner layer of fluoroplastic is provided. The tubing is manufactured by simultaneously wrapping a reinforcing fabric ribbon layer and extruding a cover layer of a multiphase polymer around the inner layer.

Abstract: A flexible duct for use in a heating or cooling system having an elongated wire cemented between two elongated plastic ribbons and wound into a multi-turn coil, a portion of the plastic ribbons of each turn overlapping and being cemented to a portion of the plastic ribbons of adjacent turns to form a duct, the wire forming a plurality of identical turns with each turn having a pair of U-shaped end portions and a pair of elongated portions, the elongated portion being interconnected by an end portion and being aligned with the elongated portions of adjacent turns. A method of making such duct and apparatus for making such duct are also disclosed.

Abstract: Two hard steel wire-made reinforcing wires and two synthetic resin wires which are harder than a soft synthetic resin pipe wall are alternately wound spirally on an inner side of the synthetic resin pipe wall while keeping predetermined intervals.

Abstract: A yarn support tube for supporting elastomeric yarns of the type having finish oil or emulsion applied to the yarn includes a tube core of paperboard, and an outer ply formed by spirally winding a laminated strip onto the tube core such that a butt joint is formed between edges of adjacent spiral turns of the strip. The laminated strip is formed of an inner paper layer and an outer layer of polypropylene film or the like which is substantially impervious to the finish emulsion. A sealing strip of polypropylene or the like, also substantially impervious to the finish emulsion, is spirally wound onto and adhered to the outer ply of the tube such that the strip spans and sealingly covers the butt joint. The sealing strip and polypropylene film layer cooperate to prevent finish emulsion from migrating into the tube core.

Abstract: A tape covering for elongate substrates such as metal pipes is provided. At least one edge of the tape is chamfered. and in preferred embodiments the angle of the chamfer is no greater than 25.degree. especially no greater than 7.degree.. In other preferred embodiments the tape comprises a backing layer and an adhesive layer, both of which preferably include a chamfered edge, the chamfer preferably extending through both the backing layer and the adhesive layer. The tape is preferably heat recoverable, and the adhesive, if present, heat activatable. The tape may be installed according to a preferred method of the invention using induction heating, preferably at such high frequency that the ratio of the thickness of the substrate to the skin depth is at least 25:1.

Abstract: The invention concerns a process for manufacturing ribbed tubes, wherein a stainless steel tube is provided with ribs by helicoidally winding a copper strip around it, and a ribbed tube thus manufactured. In joining the tube and rib, the unmelted copper strip is set on the tube surface edgewise into a melted area produced by a laser beam exclusively on the tube surface, thereby bonding the strip onto the tube by the solidification of the melted tube material. In this manner ribbed tubes can be provided, featuring an internal tube made of corrosion-resistant stainless steel and a helicoidal rib made of copper for increasing the heat exchange surface of the tube, which is distinguished by high thermal conductivity.

Abstract: A heat protective sleeve for the protection of elongated members is disclosed, the sleeve having a first sheet of insulative material with an outer reflective layer. Oppositely disposed edges of the first sheet have means for joining the edges to a portion of the first sheet in overlapping relationship to form a tubular sleeve. A second insulative sheet is attached to the outer surface of the first sheet inward from the edges. The second sheet also has a reflective layer on its outer surface and is attached to the first sheet along its edges, parallel to the edges of the first sheet, thus, forming an air pocket between the sheets. A stiff monofilament wire bent into a spiral or other shape is disposed within the air pocket to maintain the pocket shape. In use, the air pocket is positioned facing a heat source and the sleeve interposes a reflective layer, an insulating layer, an air pocket, a second reflective layer and a second insulating layer between the elongated members and the heat source.

Abstract: A pipe and method of manufacture of the pipe are described. The pipe comprises a core of helically wound steel strip embedded in a plastics material matrix and lined with inner and outer linings of filament wound fiber reinforced plastics material.

Abstract: A two-ply core for core wound paper products. The inner ply of the core has more resistance to compression than the outer ply. The outer ply may have more resistance to tension than the inner ply. The two-ply core is suitable for use with core-wound paper products and particularly those which have been diametrically compressed. The core may comprise two plies of differing basis weights, wherein the inner ply has a greater basis weight than the outer ply.

Abstract: A high shear adhesive tape having an adhesive layer containing a rubber mix and at least one tackifying resin, the rubber mix including an effective amount of a styrenic block copolymer or terpolymer, the adhesive layer further being characterized as being free of any crosslinking agent for rubber in the mix; and pipewrap systems employing this tape. In a particularly preferred embodiment, the rubber mix also includes crosslinked halogenated butyl rubber.

Abstract: A method of forming a flexible spiral-wound tube includes the steps of spiral wrapping at least two webs of material in an overlapping relationship about a mandrel to form a multi-ply tube and advancing the tube along the mandrel and off a reduced diameter portion of the mandrel at a forward end of the mandrel. Advancement of the tube along the mandrel includes rotating the tube as the tube longitudinally moves such that the tube advances in a spiral manner. The method further includes the step of retarding movement of the tube along the reduced diameter portion of the mandrel by providing frictional resistance between the tube and the mandrel to form folds or pleats in the tube so that the tube becomes extremely flexible. The flexible spiral-wound tube has a uniform pattern of generally diamond-shaped folds therein.