Abstract: A flat strip-like metallic material having both surfaces coated with a first synthetic resin layer is passed between plural pairs of upper and lower rollers so that a U-shaped recess is formed at the central portion in the longitudinal direction of the strip material and ring-like projection at both edges of the strip material. Then, the strip material is bent into a spiral form. The spirally wound strip material is passed to a transferring means and first, second and third extruders to extrude molten resin and first, second and third pressing rollers operating in association with the repsective extruders, whereby a second synthetic resin layer is formed at the outer circumferential portion of the adjoining edges of the sprially wound strip material, a third synthetic resin layer is formed on the back side of the recess portion of the same, and a fourth synthetic resin layer is formed on the outer circumferential surface of the recess portion and the adjoining edges of the spirally wound strip material.

Abstract: The process involves creating an internal lining in a bore, e.g., for repairing well casings. A plurality of layers of resilient strip material having an adhesive material, in uncured condition and interspersed between overlapping surfaces of the strip material and between the outer surface thereof and the bore, are applied in spiral fashion by means of a mandrel to the portion of the bore to be lined. Pressure is then applied to the internal surface of the liner to force the liner against the inner surface of the bore, preferably by inflation of a packer or packer assembly whose length is substantially the length of the liner, until the adhesive is cured. The mandrel for creating the liner in a bore includes a portion adapted to receive the spirally-wrapped strip material, a packer at the upper end of the wrappable portion of the mandrel and a packer terminating at the lower end of the wrappable portion of the mandrel and extending therebelow.

Abstract: A container of monococque construction having a peripheral wall comprised of concentric inner and outer walls, with the space between the walls being filled with a plastics material. At least one of the inner and outer walls is a spirally-wound tube having raised seams projecting into the space between the inner and outer walls. The container is particularly adapted to form the body of a waste compactor for use as a bulk container for both fluid and particulate materials.

Abstract: Novel system for providing anti-corrosion protective coatings, e.g. for metal pipes and the like, comprising: (1) a rubber-based primer coating mixture; and (2) an adhesive tape comprising a backing carrying a rubber-based adhesive coating comprising a mixture of pre-crosslinked butyl rubber and virgin butyl rubber alone or in combination with reclaimed butyl rubber, the system further including a crosslinking agent and a crosslinking activator adapted to provide an incipient or in situ crosslinking of the system after the primer coating and tape are applied.Preferably, the crosslinking agent is contained initially in the adhesive coating; and the activator is contained initially in the primer.

Abstract: Pipe insulation comprising a number of substantially identical, annular bodies cut out in the shape of sheets from mineral wool, glass wool or similar fibre materials and having such a fibre structure that their compressibility is biggest in axial direction, the mineral wool bodies being put together around a common axis and wrapped in a resilient, crepe-structured or pleated sheet material glued to the mineral wool. In order to make possible the bending of the pipe insulation also in the case of the glue being hardened to such an extent that it has become hard and brittle, the glue is applied in the shaped of essentially parallel rows of glue points, the rows running substantially perpendicular to the axis of the insulation and forming between themselves an encircling band of glue-free sheet material.

Abstract: Disclosed is a rigid or flexible conduit usable particularly for transporting fluids and enabling to limit the permeability to transported fluids. According to the invention, the conduit comprises at least an inner flexible sheath (1) made of thermoplastic, elastic, or rubber material and an outer sheath (10) comprising a metal layer (3) and arranged around said inner sheath (1). Said metal layer comprises at least a layer of flat metal band (3) which is spirally wound with a winding angle .alpha. higher than 50.degree. and lower than 90.degree. with respect to the axes of the conduit. For rigid conduits, said metal layer (3) is adhered to said inner flexible sheath (1) on the major part of the width of the band (3).

Abstract: A flexible hard pipe in which over a soft inner pipe wall a hard belt-like member is helically wound. The belt-like member has a double-hook shape in which a flat inner surface is fused to the inner pipe wall. A raised hook portion overlaps a hook portion of the fused portion of a neighboring wrap.

Abstract: A tubular structure is provided including an internal tube and an external tube which is formed from at least a straight strip bent or undulated, whose width is disposed substantially along at least a line normal to said tubes which it separates. It may be used, for example filled with an insulating lagging, by surrounding a pipe line or being adapted to the pipe line which then forms the internal tube.

Abstract: A flexible pipe comprising a flexible solid pipe to which is bonded a spirally wound belt having an S-shaped cross section. The two sides of the belt are bent at parallel acute angles and successive wraps are overlapped. Cords may be inserted into the space formed by the flexible corrugation.

Abstract: The invention provides a tampon tube that is formed of a series of layers of paper, adhesive sealing means and superabsorbent material. The method of formation generally is to provide each of these materials in a sheet form and wind the tube convolutely with heat sealing during winding.

Abstract: A method for producing pipeline having a thermally insulating coating in which a continuous matrix of water-impermeable material has dispersed throughout it hollow microspheres or cellular particles which improve on heat insulating properties of the basic matrix.

Abstract: A pipeline vortex spoiler system comprising elongated foamed plastic strakes which are formed in sections approximately fifteen to twenty feet in length and have a somewhat inverted T-shaped cross sectional configuration. The strakes are disposed on the exterior surface of a cylindrical pipeline or the like to form a spiral or helical path and are secured to the pipeline section by flexible cylindrical bands or straps. The strake sections are adaptable to use on pipeline sections and other cylindrical bodies having a wide range of diameters, and are easily stored, shipped and attached to pipelines and similar bluff body structures in the field.

Abstract: A reinforced composite tubular body comprises a metallic reinforcement of helical convolutions completely embedded in a tubular body of thermosetting polymer which has a coefficient of elongation at rupture less than 15%. The reinforcement comprises at least one metallic reinforcing strip wound helically around the longitudinal axis of the tubular body so as to form a plurality of successive helical convolutions completely embedded in the wall thickness of the tubular body and separated from one another by the polymeric material. The extent of overlap of adjacent helical convolutions is at least equal to e.multidot..sigma..sub.r /2.tau. where e designates the thickness of the strip, .sigma..sub.r the ultimate breaking strength of the strip and .tau. the shear strength of the metallic strip/polymeric material interface.

Abstract: Process for manufacturing a calibrated cardboard tube having minimal surface roughness and dimensional stability, involving helically winding a plurality of glued strips or plies around a mandrel and then polishing the exterior surface of the rough tube, coating the exterior surface with a thermosetting resin, cutting the tube, drying and compressing the cut pieces transversely together with applying heat, wherein at least the next-to-last ply and the last ply or strips of a dense material are impregnated with a thermosetting resin and, after coating and heat compression of the pieces, a final coating of a thermosetting resin is applied to the last plies before drying the coated surface and buffing or finish polishing to form a smooth surface, and the apparatus for performing the process.

Abstract: The present invention relates to a process for manufacturing an axi-symmetrical three-dimensional structure formed by superposed layers of fibrous material bonded together, said process comprising the following steps of:--bringing onto a rotary mandrel having the section of the structure to be manufactured, a tape of fibrous material whose width is several times less than the length of a generatrix of said structure:--winding the tape over the mandrel to form superposed layers, each layer being formed by successive turns of the tape of fibrous material, and--during winding, successively bonding the layers together by needling, said needling being effected at the place where the tape is superposed on the mandrel or on the previously formed layer. The invention also relates to an apparatus for carrying out said process.

Abstract: A flexible armored synthetic resin hose for showers, with an extruded inner hose part of thermoplastic or elastomeric material, an extruded outer hose part of thermoplastic or elastomeric material, which is at least partly supported so as to be spaced from the inner hose part, and a reinforcement helix for armoring the hose, said helix being placed between said inner and an outer hose parts.

Abstract: A tank for use in storing volatile liquids and, in particular, petroleum distillates, includes a fiberglass outer wall lined with a metal foil liner that substantially covers the entire interior surface of the fiberglass tank. In a preferred method of constructing a tank, a lay-up mandrel has a foil end cap placed over a first end thereof and pressed to fit closely the exterior surface topography of the mandrel. A strip of metal foil is laid down on the mandrel overlying at least a portion of the metal foil end cap and the metal strip is wound in a helical fashion such that the adjacent coils of the helix overlap one another until the mandrel is essentially completely covered by the metal foil. Fiberglass resin and glass fibers are then laid down over the metal foil and cured in place. The mandrel is then removed, leaving a foil-lined fiberglass tank.

Abstract: A plastic pipe comprising an oxygen-impermeable casing, wherein the casing comprises a barrier layer for oxygen, and an adhesive layer adjacent to the circumferential surface of the pipe and attached to the circumferential surface by an sealed bond, wherein the casing surrounds the circumferential surface on all sides, and wherein the barrier layer is elastic, is substantially impermeable to oxygen and comprises a polyvinyl alcohol, a vinyl alcohol/ethylene copolymer, or polyacrylonitrile. Also disclosed is a process for the production of the pipe and a use of the pipe as a heating pipe.

Abstract: Structures, such as pressure vessels or pipes, for the storage and transportation of fluids under pressure are wrapped with a composite material including a high-strength unidirectional filament material in a matrix of a flexibilized isophthalic polyester resin which has an elongation at least equal to the elongation of the material of the structure. The index of refraction of the resin is matched to the index of refraction of the filament material so that the pressure vessel is visible through the wrapping. The resin discolors when exposed to a heat above which the material of the structure weakens, thus acting as an indicator that the structure is unsuitable for use.

Abstract: A single piece carbon fiber composite article suitable for use as a hot-press mold is has an inner volume of chopped fiber and an outer volume of continuous carbon fiber all in a common graphite support matrix. The article is assembled by winding continuous carbon fiber around a mandrel formed of chopped carbon fiber in a matrix of carbon, impregnating the interstice in the winding and mandrel with graphite precursor material. The precursor material is converted to graphite, creating a common matrix between the internal mandrel and the external windings. The internal volume is machinable to form a graphite mold cavity, and has essentially the same coefficient of thermal expansion as the external volume.

Abstract: A lightweight ceramic refractory covering for water cooled members forming the structural portion of a metalliurgical furnace which is thermally insulating and resists wet scale attack, corrosion and vibrational stresses. The covering comprise an inner layer of thermal insulating ceramic refractory fiber blanket, an open weave ceramic cloth about the blanket, an inner layer of veneering mortar, compressed rings or strips of ceramic fiber material, and a hot face layer of veneering coating.

Abstract: A tile-lined pipe and its method of manufacture comprising a tubular pipe member having a layer of tile elements on the inner surface to form a lining therefor. The tile elements extend one after another along helical lines and are formed by subdividing larger tiles transversely along score lines so that the adjoining faces of the subdivided tiles will be in closely conforming adjoining relation. Within the tile elements is an erodible layer. The structure is encompassed by resin saturated fiberglass. The resin serves to absorb energy from impacting particles.

Abstract: According to the method of the invention there is wound, around a hollow body (1) and in substantially contiguous turns, a flexible strip (2), the latter strip being fixed onto the hollow body. The strip is of a material, the tensile limit of which is in excess of that of the material of which the hollow body (1) is made, and when wound around the hollow body, a tension is applied thereto which is sufficient for the stresses which may develop within the body and the winding of the strip (2) to reach their permissible maximum limits at substantially the same time, when the hollow body is used under pressure.

Abstract: A concrete pipe of the type employed, for example, in large sewers is described, having a concrete wall and an inner lining sheet of a polymeric or other plastic material anchored to the wall by a layer of fabric welded or otherwise firmly connected to the sheet. The fabric includes a plurality of preferably monofilament projections having a higher modulus of elasticity than the material of the sheet which projections extend into the inner wall of the concrete pipe and anchor the fabric and sheet thereto. A protective plastic ring and a covering strip positively support the sheet at the joint between two pipes.

Abstract: Tube bundle heat exchanger of graphite, in which a multiplicity of graphite tubes are set into the tube sheets and are joined to the sheets by screw or cement joints, characterized by the feature that each tube is surrounded by at least one group of graphite fiber bundles, the latter are connected to the tube in a force-locking manner, and the distance of adjacent fiber bundles is five to ten times the diameter of the graphite fiber bundle.

Abstract: An anticorrosion and high shear resistant pipewrap system is described wherein a pipe surface is first coated with a primer comprised of natural rubber, resins, and a metal oxide activator dispersed in an organic solvent. The primer-coated pipe is then overlaid with an adhesive-coated polyolefin tape, the adhesive comprising a butyl-based rubber, tackifying agent and a cross-linking agent, p-quinone dioxime. The cross linking agent functions in the presence of an organo-titanate-treated metal oxide, being a catalyst such as lead dioxide, or the like, that results in high rates of cross linking in both the primer coating, the adhesive coating and the primer/adhesive interface zone. Minimal creep of the described anti-corrosion protective coating is noted in high shear stress environments.

Abstract: A lightweight ceramic refractory covering for water cooled members forming the structural portion of a metallurgical furnace which is thermally insulating and resists wet scale attack, corrosion and vibrational stresses. The covering comprise an inner layer of thermal insulating ceramic refractory fiber blanket, an open weave ceramic cloth about the blanket, an inner layer of veneering mortar, compressed rings or strips of ceramic fiber material, and a hot face layer of veneering coating.

Abstract: A weight-coated pipe has an innermost anti-corrosion layer, a helically-wound covering of a cementitious sheeting having a reinforcement of organic fibrillated film network arranged as a plurality of superposed layers. This covering is applied in a post-cracked condition so that constituent parts of the next layer of concrete penetrate the micro-cracks and form a good bond. An outer layer of helically-wound sheeting similar to the first-mentioned covering serves to protect the weight-coating of concrete from impact damage.

Abstract: Filament-wound composite bodies are disclosed. These bodies contain filament-wound fibers and resin. The resin, when cured, has a density of less than 1.05 g/cc and exhibits a water pick up of less than 1% by weight. When uncured, the resin contains an aromatic vinyl hydrocarbon monomer and as its major component poly(1,2-butadiene), carboxy-terminated poly(1,2-butadiene) or mixtures thereof and has a viscosity of less than 2000 cps at 45.degree. C. These filament-wound bodies advantageously are embodied as rocket motor cases.

Abstract: Tube for a cracking plant, comprising an inner tube, a coaxial outer tube and a reinforcement layer intermediate said inner and outer tube, said reinforcement layer having openings or passages through which said inner and outer tube are bonded together.

Abstract: An easy to manufacture, strong, high pressure flange-type insulating coupling with wide separation between exposed metal parts is provided. The insulating coupling is made up of two metal half flanges supported on a nonconductive cylindrical nonmetallic member. The space between the two vertical ends of the half flanges is wound in typical fashion with plastic impregnated glass fibers to provide the necessary working strength.

Abstract: A cast-iron or steel pipe is coated with a two-component epoxy resin and then, prior to curing of the resin, is coated with a relatively thick layer of hydraulic concrete. A layer of a water-impervious bitumen is then applied over the concrete. The concrete layer does not extend over the spigot in a bell-and-spigot pipe, and a special fitting is provided for such a piece of pipe when the spigot end must be cut off.

Abstract: A steel reinforced pipe has a structural wall section sandwiched between inner and outer linings. The inner and outer linings each comprise resin-rich layers reinforced with glass or other fibers to impart the desired characteristics to the inner and outer pipe surfaces. The structural wall section comprises three or more structural steel reinforcing strips encapsulated with a structural epoxy resin and helically wound in the form of helical convolutions one over the other about the pipe axis such that the convolutions of each strip are axially separated from one another, by the epoxy resin, a distance not greater than 3 mm and radially separated from the convolutions of the next adjacent strip, by the epoxy resin, a distance not greater than 0.25 mm. The structural steel reinforcing strips preferably have a width between 100 mm and 200 mm and a thickness between 0.25 mm and 0.75 mm.

Abstract: A tube system, which includes an inner and a concentric outer tube, is provided with a spacer made by cutting oblique notches into a polyurethane foam layer on a paper ribbon and by helically wrapping the ribbon onto the inner tube, the oblique and tapered foam elements pointing inwardly or outwardly, but the notches are aligned to form axial ducts. After forming the outer tube about the spacer, these ducts are filled with material that foams in situ.

Abstract: A method of making a flexible hose comprising a hose main body formed from a rubber strip wound into helical coils rigidly joined together and a linear reinforcement of rigid resin disposed in contact with the strip in a manner to have a thickness between the reinforcement and the inner surface of the helically wound strip. The reinforcement is bonded to the integral homogeneous rubber portion of the strip.

Abstract: The disclosure embraces a method of spraying a binder composition of hybrid character containing both organic and inorganic materials into a fiber-forming hood or chamber onto glass fibers produced by a fiber-forming process, the disclosure embracing fibrous insulation products, such as pipe insulation and block insulation, the products embodying hybrid binder composition wherein the organic phase of the binder composition improves moldability and handleability of the fibrous product during processing and installation and which provides hardness and toughness characteristics in the products to resist or prevent handling damage and physical damage in use, the inorganic phase of the binder system providing high bond strength and improved thermal stability in the product particularly under high temperatures which may volatilize the organic binder, the inorganic phase of the binder system preventing or resisting fiber slump under high temperature conditions.

Abstract: The invention provides a hose that withstands a vacuum which is considered to be approximately two to three times greater than the vacuum withstood by the best known previously available pliable convoluted semirigid plastic hoses of comparable designs. To fabricate the hose, a bobbin of wire stock is unwound, with the wire preferably being pulled off the end of the bobbin. The wire is then looped around a spool to form it into a spiral or coil having a preset diameter which is proportionately smaller than the diameter of a preformed, semirigid convoluted plastic hose. While the pulled wire is still substantially extended, it is taken up by being rolled upon the plastic hose, thereby snapping the preset formed wire spiral into the spiral convolutions formed in the surface of the hose. If desired, the spiral or coil might be pulled off the end of the samller diameter spool to impart a twist thereto.

Abstract: A hydraulically setting mass having a small tendency to cracking and a felt-like structure when freshly mixed while showing no cracks or only microscopic cracks when in the hardened condition comprises essentially a fast-hardening hydraulic cement binder, water, alkali-resistant mineral fibers and additives. The freshly mixed mass is applied in a layer to the surface of a tube or the like, the applied mass is completely covered with a sheet and the mass is pressed against the surface with the sheet.

Abstract: In a pipe coating made by wrapping the pipe with polyolefin tape and a butyl rubber based adhesive, the strength of the bond to the pipe at elevated temperature is improved by incorporating in the adhesive a cross-linking agent which is either 0.15-1% by weight of p-dinitrosobenzene or 1.0 to 2.5% of p-quinonedioxime, or both together with an activator.

Abstract: A tube made from a rigid material such as PTFE is surrounded by a rigid tubular sheath. The ends of the synthetic material tube are provided with collars which emerge from the rigid sheath, the sheath having on its inner face, adjacent to each collar, a locking member. The locking member forms a substantially annular relief and penetrates a correspondingly shaped groove on the outer surface of the tube of synthetic material.

Abstract: A thin-walled annular shell of high rigidity relative to its unit weight is provided. The wall of the shell is a composite material built up layerwise of glassy alloy strips of high transverse aspect ratio such that each layer is a strip wrapped at a substantially 45.degree. helix with respect to the elongate axis of the shell and with adjacent layers having alternating directions of wrap. Bonding between adjacent layers and between strips within each layer is accomplished in a selected manner such that the composite wall is structurally monolithic for thin-walled applications thereby taking substantially full advantage of the extraordinary strength properties of glassy alloy strip.

Abstract: The invention relates to improving the heat transfer properties in boiling liquids of tubes and other surfaces by applying a very porous reticulated organic foam layer in contact with the tube surface, and then plating a thin metal coating on the foam substrate. Preferably, the tube is copper and the plating consists of a first electrolessly applied layer of copper and a second electroplated layer. The foam is preferably in the form of a thin tape which is spirally wound about the tube. Pyrolization of the foam after plating improves the heat transfer performance of the tube.

Abstract: A flexible plastic tube, comprises, an extruded inner tube or tubular portion and an extruded outer tube or tubular portion of a thermoplastic material overlying the inner tubular portion and spaced radially outwardly therefrom and including a reinforcing strip of substantially U-shape configuration wound around the inner portion and bonded to the inner and outer tubular portions. The reinforcing strip has radially extending sidewalls in the form of fins which define a first cavity therebetween and, in addition, successive turns of the reinforcing strip define a second cavity therebetween which is located between the outer and inner walls. The sidewalls advantageously have radially outwardly tapered cross-sectional shapes.

Abstract: An elongate hollow structure with a plurality of reinforcements arranged in a pattern and acting as spacers between a pair of skins. The skins are of resin impregnated wound filaments with reinforcing strips of facing preimpregnated wound filaments that crisscross at the spacing reinforcements, abutting panels extend between adjacent reinforcing spacers to fill the space between the skins, and the structure is bonded with resin into a composite structure.

Abstract: A method of manufacturing a fiber reinforced plastic pipe part, comprising a first wall part and a wall part adjoining the latter through an inner rounded corner transition having a radius of curvature of less than 5 mm, preferably 0,5 to 3 mm.

Abstract: A puncture sealing apparatus for handing a fluid such as aircraft fuel, and a method for manufacturing a puncture sealing apparatus for handling a fluid. A metallic tubular member is provided which defines a chamber for the fluid; the metallic tubular member being constructed of a material which tends to deform outwardly upon a projectile exiting the chamber. A layer of puncture sealing material is disposed in covering relation to the metallic tubular member. An overwrap of filament material is wound directly onto the metallic tubular member in a predetermined winding pattern, and at a predetermined wrap tension, and the coating of puncture sealing material is disposed in covering relationship to the overwrapped metallic tubular member.

Abstract: A composite tubular assembly comprising a membrane for membrane filtration fixed to the inner side of a tube of non woven material, consisting of a wound band of a sealable fibres containing non woven material, which may be helically or non helically wound, consecutive overlapping windings of the band being completely interconnected by ultrasonic heatsealing and thereby forming a smooth inner wall of the tube.

Abstract: Steel pipe is provided with an external protective coating by first applying a corrosion protective coating of fused powdered epoxy resin adhered to the pipe, then applying (e.g. as by wrapping a sheet) an outer polyolefin layer directly onto the corrosion protective coating. The outer sheet of polyolefin is provided with a pressure-sensitive adhesive or a hot melt adhesive which adhesive may also be reactive with the epoxy coating (e.g. one having free carboxyl group such as ethylene acrylic acid copolymer). The polyolefin is preferably polyethylene or polypropylene and most preferably polyethylene. Either high or low density polyolefin may be used.

Abstract: The invention provides a hose that withstands a vacuum which is considered to be approximately two to three times greater than the vacuum withstood by the best known previously available pliable convoluted semirigid plastic hoses of comparable designs. To fabricate the hose, a bobbin of wire stock is unwound, with the wire preferably being pulled off the end of the bobbin. The wire is then looped around a spool to form it into a spiral or coil having a preset diameter which is proportionately smaller than the diameter of a preformed, semirigid convoluted plastic hose. While the pulled wire is still substantially extended, it is taken up by being rolled upon the plastic hose, thereby snapping the preset formed wire spiral into the spiral convolutions formed in the surface of the hose. If desired, the spiral or coil might be pulled off the end of the smaller diameter spool to impart a twist thereto.

Abstract: A method for forming an adherent protective coating on articles, particularly pipes for burial in the ground where they will be subject to corrosion, which comprises wrapping a hot impregnated fabric strip spirally around the article, the said fabric, which is preferably of glass fibre, being impregnated with a hot, molten adhesive, e.g. coal tar or bitumen and forming a sheathing of a plastics material bonded to the impregnated fabric, preferably by winding a strip of polyvinyl chloride sheet over the wrapped article.