Abstract: There is disclosed a method and apparatus for making tubular fiber reinforced thermosetting resin elements having a thermoplastic lining. The technique involves application of a thermoplastic lining layer to an axially moving mandrel surface, application of at least one layer of fiber reinforced thermosetting resin material superimposed upon the lining layer, providing for bonding of thermosetting and thermoplastic layers to each other, and heating the thermosetting resin to effect solidification during axial advancement of the superimposed layers with the moving mandrel surface. Provision is also made for applying a thermoplastic jacket layer superimposed upon the thermosetting layer.

Abstract: A precision thermoplastic winding method and apparatus for forming heterogeneous pipe by winding a first hot thermoplastic strand on a mandrel, then applying a second strand of uncured thermosetting material on the first layer to form a second layer on the mandrel, and thereafter helically winding a hot thermoplastic strand on the second layer to form a third layer on the mandrel and to thus seal and cure the second layer of thermosetting material.

Abstract: In a machine for manufacturing reinforced tubes there are provided individually rotatable members supplying reinforcement threads around the tube.

Abstract: A machine for and a method of forming a continuous tubing of flexible material, said tubing being wound in helical fashion and having interlocking edge portions. The machine includes a pair of spaced askew related rollers about which a strip of flexible material is wound, one of the rollers having a plurality of annular fins spaced apart the width of the strip of flexible material to partially receive the strip between portions of adjacent fins. The other of said rollers may have a single annular fin. Guide means contact external surfaces of edge interlocking portions of the wound strip. Both of said rollers are driven at the same speed. In the method of forming such a flexible continuous tube the improvement comprises positively engaging internal surfaces of turns of the strip being wound for advancing the strip in one direction and positively engaging external surfaces of a portion of at least one turn of the strip being wound for guiding the strip on the pair of rollers.

Abstract: Pipe coating apparatus which incorporates means for rotating and advancing a pipe along a specified path and an applicator means for placing cementicious materials thereon. The slurry is applied by a mechanism having a top opening which receives cement therein, the opening directing cement to a reinforcing ply which is applied to the pipe. The reinforcing material is delivered through the applicator mechanism. The cement falls on the reinforcing material which normally has a mesh construction. The pipe is advanced and rotated simultaneously. The helical movement of the pipe draws the reinforcing mesh into a gap at the lower side of the pipe above a free rotating parallel roller. A ply of weatherproofing material such as plastic film is placed on the pipe.

Abstract: The fabricated pressure vessel is a filament wound structure having a connt winding angle assuring maximum filament utilization efficiency and also having polar end openings of different sizes. Fabrication of the vessel includes a first step of forming a structure having filament windings and identically-sized polar openings equal to or less than the smaller of the openings dictated by the design. Identical openings permit the constant winding angle. In the winding operation, wafer-like mats formed of dimensionally-stable material are interspersed between the filament layers at each polar end. In the final step, the polar openings then are machined to the desired size. The interspersed mats encircle the polar openings and reinforce the polar regions.

Abstract: A method and apparatus for forming flanges of fiberglass reinforced plastic on a tubular member, the method including the steps of soaking at least one fiberglass strand which is directed to a rotating tubular member whereinafter such strand is wound and laterally distributed about the tubular member forming a plurality of layers with such layers being constrained to form an annular flange on the tubular member of a predetermined axial cross sectional width and height.

Abstract: An improved apparatus for producing a flexible plastic corrugated tubing includes a pair of relatively short, slender rotating mandrels extending substantially parallel to one another and separated along a vertical plane and around which a continuous ribbon of molten plastic is spirally wrapped to form the tubing. In another embodiment, a plurality of elongated rollers spaced apart axially form a tunnel therebetween through which the tubing is directed from the mandrel at least one of the rollers being rotatably driven to drive the tubing through the tunnel.

Abstract: An improved process, and the apparatus for carrying out the process, of forming an elongated hollow body from fibre-reinforced synthetic resins. A plurality of resin impregnated support fibres are positioned over and extend longitudinally along a rotating mandrel, which support fibres are fed from a feed station having a plurality of spools thereon, which feed station rotates synchronously with the mandrel. The longitudinal support fibres form a fibrous substructure which rotates with the mandrel. A plurality of fibrous elements, also resin impregnated, are wrapped around the fibrous substructure to form the hollow body. The hollow body is gripped by a clamping device disposed at the discharge end of the rotating mandrel for pulling the hollow body and thereby displacing same longitudinally along the mandrel, which clamping structure simultaneously permits rotation of the hollow body with the mandrel.

Abstract: A method and apparatus for continuously forming a reinforced flexible hose is disclosed. The apparatus includes a hose-forming device including a plurality of synchronously-rotatable mandrels with a plurality of spaced apart, annular grooves therein fixedly disposed in skewed fashion relative to each other. The reinforcing element of the flexible plastic hose is formed from metal wire which is delivered tangentially into the grooves in the rotating mandrels in a sequential, progressive fashion thereby forming a helically arranged wire structure. Simultaneously with the delivery of the wire to the mandrel grooves, the longitudinal edge of the plastic ribbon which is to form the body of the hose is pre-moistened with an appropriate rapid-drying, liquid-bonding agent and then circumferentially wrapped about the wire to completely enclose it. The succeeding edge of the following tape wrap is adhesively bonded to the subsequent tape wrap.

Abstract: A precision thermoplastic filament winding process for forming into pipe or similar articles by winding strands comprised of semi-hardened thermoplastic material on a rotating mandrel to form a layer thereon.Single or multiple component, unreinforced and/or continuously reinforced filament wound cylindrical products are continuously produced by winding, at least an inner layer of thermoplastic material upon a rotating cooling mandrel which reciprocates axially in timed relation with moving guiding means and a rotary stripping means.Timing sequence provides a dwell relationship between the cooling mandrel and the hot semi-molten applied material so that at least the inner surface of the freshly applied material is rendered non-sticking and strong enough to enable it to be moved along the surface of the mandrel an incremental distance determined by the planned sequence and pattern required to give the desired specific properties.

Abstract: A method of manufacturing a reinforced flexible tube in which a hard synthetic resin spiral core is embedded in and fused to a soft synthetic resin matrix through the medium of a semi-hard synthetic resin adhesive layer and the apparatus for carrying out the method of manufacturing the tube. Hard and semi-hard synthetic resin materials are simultaneously extruded from extruders to form a first composite linear element in which these two separate materials are firmly bonded together owing to the small extruding temperature difference between these two separate materials. The first composite linear element is preheated to make the temperature difference between the linear element and a soft synthetic resin material to be extruded on the linear element small.

Abstract: An apparatus for continuously manufacturing a reinforced plastic pipe in which a reinforced plastic strip having a substantially I-shaped reinforcing spiral core embedded therein and partly exposed out of the strip is wound on at least three segmental sleeves slidably mounted on rotary shafts whose centers are arranged at vertexes of a regular polygon, respectively. During rotation of the rotary shafts, those segmental sleeves which are in contact with an envelope that is tangent to the segmental sleeves are moved forward while those segmental sleeves which are not in contact with the envelope are moved backward in a smooth manner by a guide means. The alternate forward and backward movements of the segmental sleeves are capable of continuously manufacturing the reinforced plastic pipe without producing strain at the joints between the lateral edges of the successive turns of the plastic pipe.

Abstract: Apparatus for generating wire reinforced tubular duct featuring a cantilever mounted mandrel supported for rotation and serving as a supporting surface about which lapping wraps of flexible strip of duct material are formed along a helical path around and forwardly off the mandrel. A helical guide fixed in relation to the mandrel and an endless drive belt coact to drive the flexible duct material along its helical path with the drive belt serving to advance the flexible duct material axially along the mandrel and to rotate the mandrel.

Abstract: A method and apparatus is provided for continuously making fiber reinforced plastic pipe in which a conveyor tube is formed on an axially fixed hollow rotatable mandrel. A plurality of bands of resin impregnated fiber elements are wound on the conveyor tube as it advances to provide the pipe assembly. The terminal end of the generated pipe assembly is sealed with a plug. A fluid under pressure is fed through the hollow mandrel and out the forward end of the mandrel into a chamber formed by the generated pipe assembly, the plug, and a fluid sealing means within the pipe assembly being generated, thereby causing the pipe assembly to advance.

Abstract: The semi-continuous manufacturing of wave-guides of great length formed by an insulated wire wound in a helicoidal way with its turns contacting one another, involves forming a first length of the guide on a cylindrical mandrel with the mandrel and the length being pushed longitudinally over a distance virtually equal to the length of the latter, the length is stopped in this position, and the mandrel is brought back to its original position to enable a new length of guide to be formed on it, and so on.