Abstract: Apparatus whereby a filament web impregnated with resin in the unpolymerized state is fed to a pole (1) at a predetermined angle (.alpha.) with respect to a plane perpendicular to this latter. The pole (1) is drawn in rotation about its axis (X-X') and the filament web is displaced along the pole from the bottom end to the top end thereof in a direction parallel to the axis of the pole while this latter is being driven in rotation. A plurality of parallel fiber slivers (8, 9, 10) spaced a distance apart are fed simultaneously to the pole (1) in a plurality of layers. The spacing between the slivers is progressively increased during displacement of the slivers between the bottom end and the top end of the pole and progressively decreased in the opposite direction. Similarly, the angle of the slivers to a plane perpendicular to that axis is progressively increased and decreased in the same directions that the spacing is increased and decreased.

Abstract: An apparatus for manufacturing a resin tube comprising: (a) a support means; (b) a central support by the support means and extending therefrom; (c) a pair of operating means supported by the central shaft at two separate positions; (d) a plurality of rotatable forming rolls each supported by the operating means at both ends thereof in such a manner that the rotatable forming rolls are arranged circularly around the central shaft and that a cylindrical envelope formed by the rotatable forming rolls has a radius changeable by operation of the operating means; and (e) a plurality of flexible link means each connected between one end of each rotatable forming roll and a driving means for simultaneously rotating the rotatable forming rolls in the same direction at any radius of the envelope. Because of this structure, the apparatus can manufacture a resin tube of any size simply by operating the operating means.

Abstract: In a method of fabricating hose, especially in very long unbroken lengths, an elongated core is mounted for rotation without longitudinal displacement and is driven simultaneously at both of its ends at a selected fixed speed. A bobbin having a length of tape wound on it is moved on a carrier along a path parallel to the length of the core, and the tape of the bobbin is wound helically onto the core while the core is rotating and the carrier is moving along the path. There may be plural bobbins, and the carrier may have a platform for a human operator who manipulates the bobbin from which tape is being wound. Tape from selected successive bobbins may be so wound in helical manner.

Abstract: Apparatus and method for producing, on a commercial scale, forming tubes of high quality and uniformity including one or more beads on the outer periphery of the tubes which terminate a desired distance from the tube end edges by sequentially cutting the bead cord material to the desired length and at the desired time relative to the tube ends and feeding such cut bead cord material between selected tube plies during the winding of the plies on a mandrel to form tubular material and then cutting the tubular material to form tubes of the desired length. Also, such apparatus and method provide for the picking up and rolling of the beads which are interrupted on the outer periphery of the tubular material and the subsequent cutting of the tubular material intermediate such bead interruptions.

Abstract: A method of manufacturing a plastic pipe having a spiral ridge on an outer surface and a flat inner surface, comprising the steps of: (a) supplying a plastic ribbon in a softened state onto a plurality of rotating forming rolls arranged circularly, so that the plastic ribbon is spirally wound around the forming rolls while partially overlapping to be fused with each other; (b) spirally winding an endless forming core belt around the forming rolls in such a manner that the endless forming core belt is sandwiched between the plastic ribbon already wound around the forming rolls and the plastic ribbon newly supplied, thereby providing the resulting plastic pipe with a spiral ridge; (c) cutting the spiral ridge after the plastic ribbon is fused with each other and sufficiently cooled, thereby providing the spiral ridge with a slit extending along it to remove the endless forming core belt from it; and (d) winding a second plastic ribbon in a softened state around the spiral ridge to fuse the second plastic ribbon

Abstract: The invention relates to a process for the production of hollow bodies of revolution formed from threads extending in three different directions, as well as to a machine for performing this process. The machining of a mandrel, the installation or implantation of retaining or locking rings on this mandrel, the winding and weaving of the threads in circumferential, longitudinal passages formed between the locking rings and the appropriate dimensional controls and checks are carried out on the same machine. On one side of the horizontal axis of the machine is provided a mobile support on which can be mounted the subassemblies for machining the mandrel, the implantation of the locking rings, winding and control, the weaving system being placed on the other side of the axis. In order the facilitate the weaving operations, the weaving carriage moves parallel to a fictitious generatrix joining the ends of the body, the weaving means being oriented perpendicular to said generatrix.

Abstract: There is disclosed an improved apparatus for making flexible hoses comprising a means for storing and unwinding reinforcing threads needed for hose building, said means comprising a set of joinable drum storing platforms as a thread applying means capable of simultaneously applying reinforcing threads in the order of magnitude of a thousand to the flexible hose to be manufactured; at least one driving mechanism being capable of positively gripping any part of the hose and being capable of advancing or advancing and rotating the hose; optional input means for supplying heat, e.g.

Abstract: An apparatus for producing helically wound double-walled fused thermoplastic pipes, corrugated outside and smooth inside. The apparatus includes extruder means forming two bands of a thermoplastic material, a former shaping the corrugated configuration of and helically winding the first extruded band, a cooled element pressing the second band to the inside of the corrugations and having passages communicating with the second band and with a vacuum means.

Abstract: The present invention is directed to an apparatus for the continuous production of elongate hollow bodies or inner linings for such hollow bodies, from a liquid material wherein the peripheral surface of a mandrel rotating about a horizontal or slightly inclined shaft is covered with a separating film and the liquid material is applied to said separating film and the resulting hollow body is continuously from the mandrel in the axial direction of the shaft while observing the solidification speed of the material, the improvement wherein the separating film is applied to the mandrel in the axial direction of the shaft.

Abstract: A helical band is produced by applying a layer of heat-settable material on to a rotating support to one side of the axis of rotation. Heat is applied to the layer, as by the support while it rotates, for a length of time sufficient for the material in the layer to set to a required extent to form the band. The band is removed before it comes into contact with the material being applied on the support. The band is preferably made of electrically-insulating material so that it can be wound helically round and bonded to a cylindrical rod of electrically-insulating material to form a helically flanged insulator for use in an overhead electric power transmission line, the flange-forming band defining along the rod a helical leakage path of substantially uniform width.

Abstract: The invention relates to a method and apparatus of manufacture of fiber reinforced tubular bodies which comprise in combination at least on cover layer and at least one core layer; said layers being wound upon a winding mandrel the shape of which corresponds to the desired shape of the hollow body. The method includes the use of a control unit which comprises a compression tunnel adapted to reduce the thickness of the core and cover layers thereby applying compressional and tensile forces simultaneously to the layers resulting in a more homogeous and therefore stronger bond between the layers.

Abstract: Steel, cast iron, synthetic resin or concrete pipes are coated with a hydraulically setting mass, such as cement mortar or a mixture of cement, fibers, aggregates and optional additives, by entraining the mass before it has set from a storage container having two opposite walls moving at about the same speed, one of the container walls being formed by a portion of the circumferential wall of the pipe being rotated about its longitudinal axis and the opposite container wall being formed by a tensioned carrier band having one end affixed to the rotating pipe and the mass with the covering tensioned carrier band being wound around the rotating pipe.

Abstract: An apparatus for continuously and sequentially forming cylindrical bodies from flat sheet material includes a rotating mandrel and an array of forming belts spaced along the mandrel for receiving and winding either continuous ribbon or discrete blanks of composite material about the mandrel to form a cylindrical body such as for a container and passing the formed body along the mandrel to a heat sealing means to seal the overlapping edges of the material; the array of belts are disposed to partially surround and run in contact with the mandrel and a gap is provided in the spiral path of the belts to permit continuous feeding of sheet material to the mandrel to enable continuous operation of the forming apparatus.

Abstract: This invention relates to a duct forming machine strip material feeder alignment compensating system which permits the adjustment of strip material being fed to a mandrel for forming duct. The strip feeder material is fed from a reel mounted on an adjustable platform. The platform is supported by the machine frame for vertical adjustment by a crank operated lead screw. Horizontal and vertical angular compensating adjustments of the strip material feed system are provided by adjustments of a spool axle mounting plate. The axle mounting plate is horizontally and angularly adjustable to keep strip material being fed from a spool to the mandrel of the duct forming machine in proper alignment.

Abstract: A flexible duct forming apparatus and method in which flexible strip material is wrapped on a rotating mandrel in a helical path, with the edges of the flexible strip material overlapping a pre-determined amount. Reinforcing wire is formed into a helix of substantially constant diameter and pitch and guided by a fixed helical means between the overlapping edges of the flexible strip material. The overlapping edges of the flexible strip material are then pressed around the reinforcing wire to seal and encapsulate the wire to continuously form flexible duct. The reinforcing wire is formed into the substantially constant helix by a fixed helical means which is interchangeably mounted on a base as is the mandrel, so that the apparatus can be used to manufacture different diameter flexible ducting.

Abstract: Crash or shock absorbing structural components made of fiber reinforced shetic materials and having portions of different diameters including at least one portion of a larger diameter than another portion, are produced by winding synthetic fibers onto a winding arbor (6) in a desired winding pattern. For this purpose a winding support cage (14) is arranged on the winding arbor (6). The winding support cage (14) has circumferential end edges provided with cut-outs (18, 18') for receiving fiber strands. Arresting pins (25, 26) reach into pairs of these cut-outs for temporarily holding the winding support cage (14) against rotation with the winding arbor when a fiber guide (12) moves into a respective starting position for the next winding operation.

Abstract: The invention relates to a method and apparatus for wrapping pipe with a cementatious material wherein the wrapping strip is provided with notches along the edges thereof which interlock along the wrapping seam about the pipe to provide an even coating. Where reinforcing mesh is provided within the coating material the mesh also overlaps at the wrapping seam to give greater strength to the coating. Compacting of the coating material is accomplished after the pipe is wrapped by means of a vibrating shoe.

Abstract: A flexible duct forming apparatus and method in which flexible strip material is wrapped on a rotating mandrel in a helical path, with the edges of the flexible strip material overlapping a pre-determined amount. Reinforcing wire is formed into a helix of substantially constant diameter and pitch and guided by a fixed helical means between the overlapping edges of the flexible strip material. The overlapping edges of the flexible strip material are then pressed around the reinforcing wire to seal and encapsulate the wire to continuously form flexible duct. The reinforcing wire is formed into the substantially constant helix by a fixed helical means which is interchangeably mounted on a base as is the mandrel, so that the apparatus can be used to manufacture different diameter flexible ducting.

Abstract: An apparatus for producing spirally wound thermoplastic pipe. The apparatus has a helical track and a series of independent moldblocks that run in the track to provide a mandrel surface that rotates and advances axially. A band of thermoplastic material is extruded onto the mandrel surface and wound on the surface in an overlapping helix. The apparatus is equipped with a moldblock return mechanism that receives blocks from the downstream end of the track and returns them to the upstream end, so that unlimited lengths of pipe can be produced.

Abstract: A semi-rigid collapsible air duct having helically biasing reinforcement element 24, enveloped between an inner skin and an outer skin with the reinforcement element in a uniform helical spacing enveloped by ultrasonic welds. The process for manufacturing the air duct includes feeding the inner duct wall skin onto a mandrel, feeding the helically biased reinforcement element onto the mandrel having a groove with a tighter helical shape over the inner duct wall skin, feeding the outer duct wall skin onto the mandrel over the reinforcement element, then passing that composite under an ultrasonic welder which welds the inner duct wall skin to the outer duct wall skin, enveloping one or more reinforcement elements in such a way as to leave the one or more reinforcement elements free to move within their respective envelopments to develope the maximum thrust to place the reinforcing elements in tension to prevent droop of the walls of the duct.

Abstract: In the forming of flexible tubing of at least one wire helix covered by a helically wrapped tape, an apparatus and method for making such tubing wherein an endless belt of a width a plurality of times the pitch of the wire helix is passed against a rotating mandrel surface to draw the wire helix and tape wrapping together.

Abstract: A device for producing a helically wound tube comprises a rotating mandrel around which the tube is wound and an extruding device having an extruder head oriented to direct a continuous strip of plastic through a profile pressure mandrel which defines a calibrating guide channel which in turn is oriented to deposit the desired width of extruded plastic strip onto the mandrel. The guide channel advantageously includes walls defining a cooling passage for a coolant for example on the wall over which the extruded plastic is directed. The extruder and the guide channel are mounted on a carriage so that they may be shifted longitudinally if the axis of the mandrel apply a continuous strip of material thereover at a selected pitch angle. The extruder advantageously includes means for directing a reinforcing rod member into the extruder head so that the extruded strip includes a central tubular reinforcement with a base flange on each side of the reinforcement.

Abstract: A hose or pipe comprising a tubular layer formed by helically winding plastics material and/or rubber around a mandrel reinforced with a high tensile spring steel wire which is formed into a helix around and simultaneously with the winding of the tubular layer by positively driving the wire into engagement with coil-forming means, disposed around the tubular layer, which gives the wire a set and produces a wire helix having an internal diameter approximating the external diameter of the tubular layer, the wire being driven into the coil-forming means at a linear speed substantially equal to the speed of the surface of the helical path around the tubular layer against which the wire coil is to lie.

Abstract: The frames of a tube winding machine comprises a cylinder with a series of spiral grooves milled in its surface to house rotary flexible shafts. The cross-section of each groove is a major segment of a circle. A guide ring is provided to ensure that the shafts enter the grooves in a direction parallel to the cylinder axis at the drive end.

Abstract: Apparatus and method for filling and sealing selected holes in a circuit board with epoxy resin or the like. The board is sandwiched in series between sealing sheets of a thermoplastic material and barrier sheets of a glass fiber or the like to form a laminate stack through which the holes are drilled at selected locations. The stack is disassembled and the board is plated to coat the linings of the drilled holes therein with conductive material, followed by reassembly of the stack together with an overlying resin-carrying sheet such as a glass fiber coated and/or impregnated with epoxy resin. The stack and the resin-carrying sheet are subjected to heat and pressure for causing the sealing sheets to adhere to the board and then for melting the epoxy resin and for forcing it to flow into the holes in the circuit board. After the epoxy resin is cured, the various sheets are stripped from the board leaving the epoxy resin within the holes.

Abstract: Flexible tubing formed of a wire helix wrapped helically with plastic tape having overlapping turns fused directly together ultrasonically, with no extraneous adhesive, and with knurling imprinted on the tubing interior, and apparatus and a method for making such tubing wherein a rotating cantilevered mandrel has a knurled anvil band over which overlapping edges of the tape pass to receive fusing vibrations from an adjacent ultrasonic horn.

Abstract: A method and apparatus for providing a substantially void-free tape wrapping around a pipe having a longitudinal weld bead protruding from the surface thereof. While the pipe is simultaneously advanced and rotated, liquid viscous sealing material is applied to the pipe, and the applied sealing material is then doctored by means of at least one doctor blade. The doctor blade faces the advancing pipe surface, with the axis of the doctor blade at an angle of about 10.degree. to 50.degree. to the axis of the pipe, and is urged against the pipe so that it is resiliently deformed by the pipe and accommodates passage of the weld bead underneath it. In this way the doctor blade doctors the sealing material so that it provides a smooth transition between the weld bead and the adjacent pipe surfaces. The tape is then spirally wrapped around the pipe. The invention is particularly useful when a heated sealing material, eg.

Abstract: An overhead electric conductor with optical fibres loosely housed in the bore of a central core, which bore also contains a greasy water-impermeable medium 4, is manufactured by causing a preformed elongate metal member of U-shaped transverse cross-section and the optical fibres to advance in the direction of their lengths, the rate of advance of the fibres being restrained. As the U-shaped elongate member is transversely folded around the optical fibres greasy water-impermeable medium is injected into the bore of the elongate metal member under a controlled pressure. The consistency of the greasy water-impermeable medium the pressure and rate at which it is injected into the bore and the degree of restraint imparted to the optical fibres 3 is such that, in a predetermined length of the conductor, the length of the optical fibres exceeds the length of the bore by a controlled extent, preferably 1 to 3%.

Abstract: Apparatus for impregnating filaments with resin, suitable for use on fibre-reinforced pipe making machines, comprises:(i) a fixed annular guide (6) feeding the filaments onto a translating, or translating and rotating mandrel (D),(ii) an annular spinning disc (4) with means for rotating the disc (12), and(iii) means for feeding resing to the disc (4).The spinning disc feeds resin to the filaments in controlled amounts and avoids the use of porous guides or resin troughs.

Abstract: An apparatus for forming flexible tubing wherein the apparatus provides a tube-forming mandrel adapted to form a continuous, reinforced, flexible tube from an indefinite length of a tape or ribbon of flexible material, together with an indefinite length of wire, which are wound and bonded together to form the tube. The mandrel includes a plurality of angularly disposed cylindrical rollers which are rotatably positioned adjacent each other, each roller being fixed at a given angular displacement with respect to the other and to the central axis of the mandrel, in order to establish the fixed skewed arrangement of a plurality of annular grooves formed in each roller, so as to allow the forming tube to advance axially along the rollers.

Abstract: A flexible duct forming apparatus and method in which flexible strip material is wrapped on a rotating mandrel in a helical path, with the edges of the flexible strip material overlapping a pre-determined amount. Reinforcing wire is formed into a helix of substantially constant diameter and pitch and guided by a fixed helical means between the overlapping edges of the flexible strip material. The overlapping edges of the flexible strip material is then pressed around the reinforcing wire to seal and encapsulate the wire to continuously form flexible duct. The reinforcing wire is formed into the substantially constant helix by a fixed helical means which is interchangeably mounted on a base as is the mandrel, so that the apparatus can be used to manufacture different diameter flexible ducting.

Abstract: Pipe coating apparatus is disclosed. In the preferred and illustrated embodiment, a laterally deployed conveyor belt rotating around a pair of rollers passes beneath the pipe to be coated. Coating material is supplied into a hopper above the belt. The hopper includes positioned slots for receiving reinforcing mesh therein and locates the reinforcing mesh in an extruded ribbon of coating material supported by the conveyor belt and applied to the pipe in helical turns. The application of multiple turns of reinforcing mesh plus shaping of the extruded ribbon enables a thicker layer of coating material to be applied to the pipe, and it is reinforced with multiple layers of reinforcing mesh wire.

Abstract: The production of a reinforced tubular article employs a rotatable roller (1) and a fixed mandrel (3) which are spaced apart so as to define a nip (4) there-between. A strip (5) of reinforced polymeric material is fed through said nip and caused to wind helically around the mandrel (3) by the action of the rotatable roller (1), thereby forming a tubular article (7) the wall thickness of which is equal to size of the nip (4).A carrier strip (11) of low friction material may be provided to assist movement of the reinforcing strip (5) over the mandrel (3). Said movement may be further assisted by arranging the rotatable roller in skewed relation relative to the fixed mandrel.

Abstract: A method and apparatus for continuously forming a reinforced, flexible duct or hose. The apparatus comprises an extruder for forming an elongated, flat strip of a polymeric material, a strip shaping means for shaping the flat strip to define a profiled strip, means for helically winding the profiled strip with adjoining turns having portions in overlapping relation, means for disposing a reinforcing wire in sandwiched relation between the overlapped strip portions, and means for bonding the overlapping portions.The method comprises the steps of extruding a continuous flat strip of a polymeric material, forming the flat strip to define a profiled strip, helically winding the profiled strip with overlapping adjoining turns, disposing a reinforcing wire in sanwiched relation between the overlapping portions, and bonding together the overlapping portions.

Abstract: Apparatus for producing tubular sheet material by extruding a fluid polymer material through a hollow centered die having an annular extending continuous or discontinuous extrusion orifice exit rotated about the die axis to discharge therefrom a continuous or discontinuous annular-form polymer structure which is collected on a generally cylindrical supported surface advancing through the hollow center of said die. The collected structure undergoes attenuation at an angle to the general extrusion direction because of the die exit rotation and consequently, has a grain therein extending at a significant angle, e.g. helically, to the general extrusion direction. The collecting surface may be formed separately from the support, e.g. by one or more endless belts passing either longitudinally or helical around the support so as to collectively define a cylindrical surface in the collection zone or combined with the support, e.g.

Abstract: Method and apparatus for continuously-developing multi-layer tubing from plural ribbons of wrapping material of indefinite length layered in seriatim upon a continuously-formed mandrel serving as a temporary supportive base for the tubing. A driven cylindrical winding mandrel is rotatable about its longitudinal axis and has a plurality of longitudinally-extending serrations on its exterior periphery. A stationary driving helix is operatively associated with the winding mandrel means for feeding a workpiece in ribbon form through the driving helix. Initial pressure means proximate the driving helix allows the continuous curling of the workpiece radially inwardly into adjacent helical convolutions about the winding mandrel. This impresses serrations on the convolutions mating with the winding mandrel serrations in the generation of the helical coil configuration and the definition of a developing formed mandrel as a supportive base.

Abstract: PCT No. PCT/US79/00450 Sec. 371 Date June 26, 1979 Sec. 102(e) Date June 26, 1979 PCT Filed June 26, 1979 PCT Pub. No. WO81/00096 PCT Pub. Date Jan. 22, 1981A braking apparatus (36) is provided for a supply spool (30) whereby material (12) drawn from the spool (30) will have a relatively uniform tension. The braking apparatus (36) includes a follower roller (40) in contact with the material (12) on the spool (30) and a brake portion (38) in adjustably controlled braking contact with a brake rotor (102) mounted for rotation with the spool (30). The follower roller (40) follows the decrease in the diametral amount of material on the spool and simultaneously moves the brake portion (38) toward the center of the brake rotor (102) wherein a uniform braking force on the spool (30) is maintained.

Abstract: A pipe jacketing and wrapping station includes a pressure roll, urging an extruded ribbon onto axially passing, rotating pipes, arriving in end-to-end abutment. Feelers determine level differences of the pipes adjacent to the pressure roll and cause the end of the trailing pipe to be lowered or lifted as required.

Abstract: A continuously advancing definite length mandrel device wherein a cylindrical mandrel surface is formed by helically wound closed-loop belt convolutions, improved in that a plurality of belts are employed to form the surface.

Abstract: The disclosure relates to a construction for a wrapped elongated structure, a method of manufacturing an apparatus to manufacture the wrapped elongated structure. The wrapped elongated structure has an elongated core. An adhesive tape having one adhesive surface is applied to the surface of the core along the length thereof with the adhesive surface facing away from the core. Tape wrapping is spirally wrapped around the core and the applied adhesive tape in order that each turn of the tape wrapping contacts the adhesive surface of the adhesive tape. The adhesive tape secures the tape wrapping in its spiral form with respect to the elongated core. The wrapped elongated structure may also structure may also included an elongated core, a first tape wrapping spirally wrapped around the core, an adhesive tape having two adhesive surfaces applied on the spiral first tape wrapping, and a second tape wrapping spirally wrapped around the adhesive tape.

Abstract: Apparatus for manufacturing cylindrical tubes from paper or similar fibrous materials. A layer of plastics material which becomes tacky when heated provided on a paper web is heated through the paper web then pressed against a plastics foil web with one edge of the plastics foil web extending beyond the corresponding edge of the paper web. The joined webs are wound helically onto a mandril with the extended edge of the plastics foil web overlapping a corresponding opposite second edge of the plastics foil web. A string of molten adhesive is applied along the extended edge on the mandril. The mandril is cooled to maintain the foil layer nearest the mandril below its melting temperature.

Abstract: A machine and method are provided employing an elongate mandrel supported at one end and unsupported at its opposite end and apparatus carried by the mandrel and being movable therealong between the opposite ends with the apparatus supporting material wound thereon to define a length of the tubular conduit and moving out of supporting relation once the conduit moves axially beyond the opposite end, and the mandrel comprises a fixed helical structure supported concentrically around a central part which is rotatable therewithin and with the helical structure defining a helical groove along the mandrel with a plurality of members defining the apparatus and being operatively connected to the central part and movable within the groove upon rotation of the central part with the members supporting material helically wound thereon and moving out of supporting relation by falling within the length of conduit at the opposite end.

Abstract: A machine for winding continuous tape and wire to form a flexible endless duct, which duct is fed out of the winding station by a cluster of rolls, and which rolls also serve as a mandrel at the winding station. The rolls are cantilever mounted with circumaxially spaced individual roll axes arranged in a hexagonal pattern around a central duct forming axis. The axes of the rolls are adjustable radially toward and away from the central axis, and these roll axes are also collectively adjustable angularly, that is to skew their collective axes relative to the duct central axis. The duct is marked off in units of length by a device which is periodically operated through a revolution counting circuit, and the duct is also cut by devices operated from a branch of said counting circuit.

Abstract: A turf-like product suitable for use as a golf tee surface is constructed of artificial turf units which are strung on a plurality of tie rods which are secured at both ends. Each turf unit comprises a number of superimposed layers of a polymeric tape having slits which are transverse to the length of the tape. Holes are programmed in determined frequency along the length of each layer by a heated plunger which passes through the layers of tape. The layers of tape are fused together at the circumference of each hole whereby integrity in the turf unit is obtained. The programmed holes are also used as a mechanical device to construct the pile surface by means of the tie rods. The superimposed layers may be formed by winding the tape on a skein winder.

Abstract: Pipe is coated by extruding a band of heat-softened thermoplastic, cooling the band and passing it through tension-isolating snubber rolls then applying it to the surface of the rotating, advancing pipe under tension, and controlling the tension isolating snubber rolls and rate of movement of the pipe surface with respect to the rate of extrusion to provide substantially controlled tension on the band between the extruder and the tension isolating means and to provide a second, higher tension on the band between the tension isolating means and contact of the band with the pipe surface.

Abstract: The longitudinal support members for the endless helical band are circularly disposed about and adjustable radially of the mandrel axis. Each support member is mounted on a plurality of parallel arms of equal length spaced longitudinally of the mandrel axis. The outer end portions of the arms for each support member are pivotally connected thereto. At each of various locations along the mandrel axis, the inner end portions of the arms at that location for all of the support members are pivotally connected to a ring which is adjustable along the mandrel axis to effect radial adjustment of the support members, and a support ring, also adjustable along the mandrel axis, is provided to support the arms radially when the longitudinal support members are in an inner portion of their adjustment range.

Abstract: The present invention relates to FRP members, the apparatus and process for making same. The FRP members are reinforced with helical strands of reinforcing material disposed in expanded helices of opposite hand, the helices of each hand being contained in discrete layers. The lead angle of each helix may be constant or varied along the length of the member independently of whether the member is cylindrical or tapered in order to provide the desired structural characteristics. The process comprises impregnating the reinforcing strands with resin and wrapping those strands onto a mandrel by apparatus in which relative rotational as well as relative translatory movement between the mandrel and a winding head may be effected to wrap the strands onto the mandrel. At least one relative movement may be selectively varied to effect the desired lead angle to the helically disposed reinforcing strands along the length of the mandrel.

Abstract: In a method for feeding reinforcing strand when making a tubular product of plastic or other synthetic material, comprising supplying helically a supporting strand during rotation of a tube blank and applying a longitudinal reinforcing strand to the blank, the longitudinal reinforcement strand is in form of pieces cut off from a continuous strand after abutment thereof against the supporting strand. The continuous strand gradually displaces the cut off lengths of strand during the rotation of the tube blank. An apparatus for carrying out the method comprises means for feeding support helically around a rotating tube blank, means for feeding portions of additional reinforcing strand oriented in the direction of the tube blank to place the portions between the supporting strands and the tube blank, and means for cutting off said axially orientated reinforcing strands. The cutting is carried out when the strand portion is held by at least one supporting strand.

Abstract: The present invention relates to a method of manufacturing from paper and other similar fibrous materials cylindrical tubes comprising an inner, dense, liquid-tight plastics foil layer, in which method at least one paper web and a plastics foil web are wound helically together on a rotating mandril with the plastics foil web located against the forming surface of the mandril, and in which the plastics foil web is bonded to the paper web by means of an adhesive. The invention also relates to an apparatus for carrying out the method.

Abstract: Method and apparatus for making resin tubes or pipes, the apparatus comprising a supporting structure having a cylindrical surface and a carrier strip mounted thereon and fed in a plurality of adjacent helical turns to provide a moving cylindrical surface on which the resin articles are formed. Friction reducing means is associated with the interface between the cylindrical supporting surface and the inner surface of the helical turns of the carrier strip. Provision is also made for forming articles by extruding resin material onto the moving cylindrical surface provided by the helical turns of the carrier strip.