Abstract: A process for producing a smooth-sided strand-based siding or wood structural panel using a secondary pressing process. The secondary pressing process is performed after the primary process completes pressing and consolidation of the substrate/board. The secondary process applies and cures the overlay after applying a water spray on the hot board immediately out of the primary process press, and before overlay application. The application of the water spray causes the surface of the board to swell and cure. A settling period follows to allow the top surface particles and strands to swell along with absorption and evaporation of the moisture. This is followed by surface sanding to remove the telegraphing and produce a smooth surface, which is then followed by lamination of the overlay(s). The process is completed by post-lamination treatment and coating of the board.

Abstract: A ventilation system for insulated pipe or pipeline to prevent corrosion thereof is discussed. The ventilation system can include an outer skin wrapped around the insulated pipe or pipeline, the outer skin separated from the insulation pipe by stand-off supports to form an annular chamber within the system. The system has a vent screen along a bottom side of the outer skin and a gable running along the top side of the outer skin, the gable having a number of openings therethrough to allow air to flow in through the vent screen, through the annular chamber and out through the gable openings, drawing moisture from the insulation thereby preventing corrosion of the pipe or pipeline.

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

Abstract: An apparatus and a method enable continuous production of a reinforced plastic pipe using a transfer film. The transfer film moves at a predetermined speed in the longitudinal direction and is arranged to be in close contact with a circumferential surface of a base mold which winds glass fiber wound around the outer circumferential surface thereof using a filament winding method to mold a reinforced plastic pipe, such that the reinforced plastic pipe molded with the moving transfer film is moved forward, thereby being capable of continuously producing a reinforced plastic pipe with a desired length without breakage. The apparatus includes a rotary axial pipe; a base mold; a transfer film feeding part; and a transfer film withdrawing part. The method for continuously producing a reinforced plastic pipe includes a transfer film adhering step; a transfer film forced moving step; and a pipe cutting and separating step.

Abstract: A tubular membrane comprises a support tube made out of one or more flexible tapes of porous support material which have been helically wound into a tube shape with overlapping tape edges which have been sealed to each other, and a semi-permeable membrane layer made of membrane forming material on an inner wall of the support tube. At least one inwardly projecting helical ridge is provided on said inner wall of the support tube, which helical ridge is covered with or forms part of the membrane layer.

Abstract: [Means for solving problem] The resin composition of the present invention comprises 100 parts by mass of a specific ethylene/?-olefin/non-conjugated polyene copolymer (A) and 0.1 to 5 parts by mass of a peroxide (B), and the copolymer (A) comprises structural units derived from ethylene (a1), an ?-olefin (a2) having 3 to 20 carbon atoms, and a non-conjugated polyene (a3) including intramolecularly two or more partial structures in total selected from the group consisting of structures represented by the following formulae (I) and (II), [Effect] The resin composition of the present invention is excellent in crosslinking properties and the resin composition and its crosslinked shaped article of the present invention can be used, without any limitation, in various applications known as applications of rubber composition, and can be suitably used, for example, for interior and exterior parts for automobiles and applications requiring heat resistance.

Abstract: A three-layer composite paper straw and a method for producing the same are revealed. Basically the paper straw is made from composite paper with three layers of composite paper spirally wound and adhered in a staggered and overlapping manner. A first layer of paper, a second layer of paper and a third layer of paper of the three layers of composite paper form the outermost layer, the intermediate layer and the inner layer of the paper straw respectively. The first and the third layers of paper are stone paper while the second layer of paper is long fiber pulp paper. The three layers of paper are stacked on top of one another in turn with the long side thereof overlapping like tiles and then adhered to one another. The paper straw is eco-friendly, recyclable, with good structure strength and easy to produce.

Abstract: A convolutely wound tube (1) is formed of a composite sheet including a first sheet (6) and a second sheet (5). The convolutely wound tube includes a first segment (66) formed of a plurality of convolute windings (2) of the first sheet, a second segment (70) formed of directly adhered and overlapping portions of the first sheet and the second sheet, and a third segment (68) formed of the second sheet wrapped about and overlying the first sheet. The second segment is an underwrap portion positioned between a layer of the first sheet and a layer of the second sheet.

Abstract: A reusable straw kit includes an elastic sheet and a fastener. The elastic sheet has a first side, a second side, a third side, a fourth side, a fifth side, and a sixth side. The second side is substantially parallel to the first side. The third side extends from a bottom of the first side, at a first predetermined angle to the first side. The fourth side extends from a bottom of the second side to join with and at a second predetermined angle to the third side. The fifth side extends from a top of the first side and substantially parallel to the fourth side. The sixth side extends from a top of the second side to join with and at a third predetermined angle to the fifth side. As such, s straw can be formed by rolling the elastic sheet in a direction perpendicular to the third side.

Abstract: The present invention relates to an installation and method for winding an elongated flexible inductor, the proposed installation comprising a first conveyor (11) for moving the elongated flexible inductor (1) in a conveyance direction, supported on a conveyance surface (12); a retaining device (13) for fixing the flexible inductor (1) to said conveyance surface (12); winding means for winding a metallic lead wire (30) around a section of the flexible inductor (1) not supported on said conveyance surface (12), comprising at least one lead wire reel (31), a lead wire feed device (32) and a turning device (33), a holding device (20) provided for holding a portion of the already wound flexible inductor (1), being located opposite and spaced from the end of the first conveyor by a minimum predetermined distance, defining a winding area (50) susceptible to being accessed by said lead wire feed device (32); said turning device (33) causing the simultaneous turning of the first conveyor and of said holding device.

Abstract: A core intended to support a reel of paper, particularly toilet paper, is formed by winding at least one web of cellulose wadding. The core is formed by winding at least one web of cellulose wadding having at least 0.51 g of water-soluble material per gram of cellulose wadding, the water-soluble material being designed to make the web of cellulose wadding more rigid and easier to disintegrate. Thus configured, the core that has both mechanical strength fit for the intended purpose and is far easier to disintegrate than a core mad of cardboard such that it can be disposed of directly in a toilet bowl without the risk of blocking the waste pipe.

Abstract: A drive cable for actuating a vehicle element which is movable with respect to a vehicle design, which can have a cable body having a flexible cable core which is wrapped with a spiral, which follows a helical line so as to become engaged with a gearwheel. At least three longitudinal ribs or crosspieces can be formed along the periphery of the cable body, said drive cable being able to support itself in a cable guide via said longitudinal ribs which form at least mostly continuous guiding lines and contact lines of the drive cable, each having the same distance all around to the cable axis. Alternatively, an elastically or plastically malleable cable jacket can be provided which engages over the cable core and the spiral and which forms a cylindrical and rib-free peripheral surface of the cable when the cable core is stretched.

Abstract: Methods for forming seamless and jointless metal parts suitable in a manufacturing environment are disclosed. The metal parts can be used in the manufacture of electronic devices and accessories of electronic devices, such as connectors. In particular embodiments, the methods involve forming a seamless cylindrical tube. The seamless cylindrical tube can then undergo a series of shaping processes that retain and exterior seamless surface of the tube. In some embodiments, the shaping processes include a hydroforming process. The methods can be performed without the use of dovetails and other types of visible joints that can complicate the manufacturing process and result in a part with aesthetically unappealing visible joints and seams.

Abstract: A method of, and an applicator for, applying a bead of a liquid coating material to a work surface by configuring a reservoir of a liquid coating applicator for viscous retention of the liquid coating material to be applied, and further configuring the reservoir to dispense the liquid coating material via surface adhesion, cohesion, and gravity.

Abstract: The invention relates to a method for manufacturing a container body (20) of a tube, the methods comprising the steps of imprinting a sheet material (10) on one of its surfaces, bending the imprinted sheet material into the shape of the container body (20) of the tube with the imprinted surface on the outside, sealing adjacent edges (15) of the bent imprinted sheet material, and coating the bent imprinted sheet material with a transparent plastics sheathing (17) by extrusion, wherein the material of the plastics sheathing (17) and/or the ink used for imprinting are chosen such that the plastics sheathing (17) does not adhere to the imprint (14), resulting in one or more ventilation areas (18) being formed between the imprinted sheet material and the plastics sheathing (17). The invention furthermore relates to a container body manufactured by such a method.

Abstract: A sheet processing device includes a carry-in path, and a retreat path that branches off from the carry-in path. A bonding device is disposed at a merging point between the carry-in path and retreat path. An adhesive-applied position of a preceding sheet is retreated to the retreat path when a next sheet is carried in to the stacker section, and then the next sheet is moved to a bonding position. The above operations are sequentially repeated to form a sheet bundle. Thus, the sheet bundle can be formed by bonding the sheets using an adhesive. It is possible to reduce stress to be applied to the sheet, and to comparatively reduce movement of the sheet applied with the adhesive, thereby preventing the sheets from being bonded to each other at a position other than a predetermined position.

Abstract: A tubular support for use with a hollow fiber membrane is made with an apparatus that comprises a forming machine and an ultrasonic welding machine. The apparatus may also include a coating nozzle for depositing a dope on the support. In operation, filaments are formed into a tubular structure in which the filaments cross each other in radial and circumferential directions, for example a braid. The filaments are ultrasonically welded together at intersections between them. The support is combined with a polymeric membrane wall to form a hollow fiber membrane.

Abstract: A lateral pipe-lining method for lining a lateral pipe that intersects a main pipe. A lateral pipe-lining material has a tubular resin-absorbing material impregnated with a curable resin and has a flange formed at one end thereof. The flange is disposed on an expandable flange-pressing implement. The expandable flange-pressing implement is expanded using a heat medium that is supplied by a first fluid source and that heats the flange of the lateral pipe-lining material to bring the flange into contact with a periphery of a lateral pipe opening of the main pipe. The lateral pipe-lining material is inserted into the lateral pipe using a fluid from a second fluid source different from the first fluid source, and the curable resin impregnated in the tubular resin-absorbing material is cured to line the lateral pipe.

Abstract: A method of producing a tubular body wherein a continuous fiber impregnated with a resin is wound around a mandrel body rotating together with a mandrel shaft section at a predetermined circumferential speed while the continuous fiber is reciprocated in parallel with a rotation axis of the mandrel body, including moving a feed roller that feeds the continuous fiber to the mandrel body without rotating from a middle of the mandrel body to one end of the mandrel body; hooking the continuous fiber by a return section provided at the one end of the mandrel body; winding the continuous fiber on the one end of the mandrel body while a center axis of the feed roller is orthogonal to a feeding direction of the continuous fiber; and rotating the center axis of the feed roller to move the feed roller in a reverse direction.

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

Abstract: A core intended to be used as a support for a roll of paper, especially toilet paper, is formed by winding at least one strip made of tissue, the strip being impregnated, at least locally, with starch so as to improve its stiffness. Thus configured, a core is provided having both a mechanical strength suitable for the envisaged use and a greatly improved ability to disintegrate relative to a cardboard core so as to allow it to be able to be disposed of directly in a toilet bowl without risk of blocking the soil pipe.

Abstract: A pressure vessel structure includes a vessel main body, and a grid layer provided on a periphery of the vessel main body and including a plurality of grid lines formed by intersecting strip-form raw materials so as to overlap alternately. Thus, a burst pressure of the pressure vessel is increased.

Abstract: The aim is to reduce the flagging tendency of an adhesive bond using a UV-crosslinkable adhesive. This aim is accomplished by provision of a composition which comprises at least one UV-crosslinkable polyacrylate and at least one terpene-phenolic resin, the total concentration of the terpene-phenolic resins being 1 to 5 wt %, based on the total weight of the composition. The invention additionally relates to a pressure-sensitive adhesive produced on the basis of this composition, an adhesive tape based on said adhesive and the use of said tape for wrapping elongate material such as cable harnesses, for example.

Abstract: A prepreg winding method includes the steps of preparing a plate, a mandrel movable toward and away from the plate, and a press roll movable toward and away from the mandrel and having an axis parallel to the mandrel; mounting a prepreg on the plate, the prepreg being formed by impregnating reinforced fibers with a thermosetting resin sheet; winding a leading end of the prepreg mounted on the plate around the mandrel, and making a pressing force act on the plate and the mandrel therebetween with the prepreg sandwiched between the plate and the mandrel and making a pressing force act on the mandrel and the press roll therebetween with the prepreg sandwiched between the mandrel and the press roll; and winding the prepreg around the mandrel by rotating the mandrel and the press roll.

Abstract: A flexible, stretchable, crush resistant hose particularly well suited for supplying breathing gases to patients in medical applications and the like is formed by providing a helix of coils of thermoplastic material that are bonded to a web of thermoplastic material, preferably along inner diameter surface portions of the coils. The web extends radially outwardly from between adjacent coils to define a helical reverse-direction crease at a maximum outer diameter of the hose when the hose is in a normal minimal-length condition wherein the coils are situated side-by-side sandwiching portions of the web therebetween. The thermoplastic material of hose is stress relieved by an annealing process performed while the hose is axially compressed after the hose is formed.

Abstract: The present disclosure is directed to a method for manufacturing a fibrous core comprises: providing a strip comprising at least one liner, and at least one fluted layer, wherein the strip has a leading edge, a trailing edge, a first strip face, a second strip face, and a strip axis substantially parallel to at least one of the leading edge and the trailing edge; feeding the strip to a mandrel having a central longitudinal axis extending in a longitudinal direction; winding the strip onto the mandrel such that the leading edge of the strip overlaps the trailing edge of the strip to form a fibrous core comprising an inner surface, an outer surface, and a longitudinal core axis; and adhering the leading edge to the trailing edge of the strip to from an overlap portion having an overlap width.

Abstract: Described are methods of making a thermoplastic core paint roller using a composite cover material having a backing made from a compound comprising a polypropylene-based elastomer and calcium carbonate having between 5% and 50% calcium carbonate by weight. One or various compounds of polypropylene and calcium carbonate having between 5% and 66% calcium carbonate by weight may be used to form portions of one or multiple components that make up the paint roller, including, for example, the thermoplastic strips and/or the adhesives. The materials can be assembled in a continuous manufacturing process.

Abstract: Described are methods of making a paint roller using preformed strips or core material made from a compound of polypropylene and calcium carbonate having between 5% and 66% calcium carbonate by weight. One or various compounds may be used to form portions of one or multiple components that make up the paint roller, including, for example, the thermoplastic strips, adhesives and/or the backing of a composite cover material. The materials can be assembled in a continuous manufacturing process.

Abstract: Systems and methods for reinforcing an existing pipeline. In some embodiments, the methods include positioning a pipeline wrapping apparatus on the existing pipeline, wherein the pipeline wrapping apparatus comprises a winding head, feeding a strip of material through the winding head, attaching an end of the strip of material to the existing pipeline, and helically wrapping the strip around the existing pipeline by rotating the winding head and axially translating the winding head relative to the existing pipeline.

Abstract: A tape laminating machine having a compaction roller lays up composite tape over a substrate having a convex radius. The compaction roller folds the tape as it moves over the convex radius, while simultaneously pivoting about a trailing edge of the tape to prevent the compaction roller from lifting off the tape laid just before the convex radius.

Abstract: The invention is directed to an integrated lightning strike protection system adapted for automated placement on a composite structure having a surfacing layer consisting of an organic polymer resin, a conductive layer of an expanded metal foil, an isolation/tack layer, and a carrier paper layer. In another embodiment of the invention, there is provided an integrated lightning strike protection system having an integrated lightning strike protection material consisting of an expanded metal foil encapsulated in organic polymer resin mounted on a carrier paper, and an automated placement machine suitable for placing the material on an aircraft composite part for protection of the composite part from lightning strikes. In another embodiment of the invention, there is provided a method for fabricating a composite structure with lightning strike protection.

Abstract: A run-flat pneumatic tire assembly includes a pneumatic tire having an elastomeric casing and a tire cavity formed therein. A longitudinally-extending and approximately planar length of strip material is helically arranged within the tire cavity to pre-stress the length of strip material for usage of the pneumatic tire during under-inflated and non-inflated conditions. A method of making a run-flat pneumatic tire assembly is also included.

Abstract: Flexible plastic hose comprising a flexible wall made out of a plurality of laterally connected windings of a helically wound profile, wherein the windings of the profile are attached to each other by means of a weld, wherein the profile comprises a web part with predetermined properties for providing flexibility to the hose, and wherein the profile ends on both sides in an upright part. The weld is located between the upright part of the adjacent windings and together with these upright parts forms a helical reinforcement rib on the flexible wall of the hose with predetermined properties for providing hub strength to the hose.

Abstract: A method for preparing a stent-graft for intraluminal delivery, including positioning an expanded polytetrafluoroethylene (ePTFE) substrate over a support mandrel, coupling a shape memory member to a polymer cladding to form a polymer clad member, winding the polymer clad member in an overlapping helical manner onto a surface of the ePTFE substrate, joining and sealing adjacent overlapping regions of the polymer clad member together and to the surface of the ePTFE substrate to form a stent-graft, manipulating the stent-graft from a larger first diameter to a smaller second diameter, and loading the stent-graft into a restraining sheath at the smaller second diameter.

Abstract: A mask system and an air delivery conduit (200) for use in the treatment of respiratory disorders. The air delivery conduit (200) may comprise a textile (220) having an airtight arrangement. A support structure (240) may be provided to the conduit to provide form.

Abstract: A method for producing an endoscope flexible tube comprising the steps of: preparing a flexible tube assembly including a spiral tube formed by spirally winding a metal strip and a cylindrical mesh sleeve, covering the spiral tube, formed by knitting metal wires; covering the flexible tube assembly with an outer coat from one end toward the other end of the flexible tube assembly by using an extrusion molding machine wherein the outer coat has a lower layer formed of a thermoplastic polyurethane elastomer and an upper layer formed of a thermoplastic polyester elastomer and the total thickness of the upper layer and the lower layer is made constant; and annealing the covered flexible tube assembly at a temperature in the vicinity of the softening point of the layer lower in softening point of the upper layer and the lower layer after the step of covering the flexible tube assembly with the outer coat, wherein in the step of covering with the outer coat, the melt viscosity ratio (thermoplastic polyurethane e

Abstract: An endoprosthesis has an expanded state and a contracted state, the endoprosthesis includes a stent having an inner surface defining a lumen and an outer surface; and a polymeric coating adhered to the outer surface of the stent. The polymeric coating includes a base and a plurality of protrusions extending outwardly from the base. When the endoprosthesis is expanded to the expanded state in a lumen defined by a vessel wall, the protrusions apply a force that creates an interlock between the vessel wall and the endoprosthesis.

Abstract: A permeable material compacting method includes, feeding permeable material between at least one set of rollers, decreasing a thickness of the permeable material, and wrapping the permeable material around a mandrel in a helical fashion.

Abstract: Disclosed is a method for manufacturing a resin pipe, including: heating a sheet member after winding the sheet member around a bar desired multiple times and holding the sheet member, wherein the sheet member is melted and molded into a resin pipe by the heating, and the bar is removed from the resin pipe after the heating.

Abstract: A method of making a belt including the steps of: (a) helically wrapping a fabric strip of predetermined width on a mandrel at a first helix angle; (b) helically winding a tensile cord onto the mandrel over the fabric at a second helix angle less than the first helix angle; (c) wrapping a sheet or a strip of elastomer material around the mandrel over the tensile cord; and (d) curing the elastomer material under pressure to form a belt sleeve. The mandrel may be grooved for making toothed belts. The fabric strip may be preformed. A resulting toothed belt has a fabric seam spanning several teeth and having a helix angle. The seam may be joined.

Abstract: A permeable material compacting method includes, feeding permeable material between at least one set of rollers, decreasing a thickness of the permeable material, and wrapping the permeable material around a mandrel in a helical fashion.

Abstract: Described are methods of making a paint roller using a composite cover material made from a compound of polypropylene and calcium carbonate having between 5% and 50% calcium carbonate by weight. One or various compounds may be used to form portions of one or multiple components that make up the paint roller, including, for example, the thermoplastic strips, adhesives and/or the backing of a composite cover material. The materials can be assembled in a continuous manufacturing process. Also described are methods of making a paint roller using an adhesive made from a compound of polypropylene and calcium carbonate having between 5% and 66% calcium carbonate by weight, and methods of making a paint roller using preformed strips or core material made from a compound of polypropylene and calcium carbonate having between 5% and 66% calcium carbonate by weight.

Abstract: Disclosed is the method for creating a reinforced hollow fiber membrane by applying reinforcing filaments to a core, casting a dope over the filaments and core, forming a membrane from the dope, and removing the core. The core may be a moving core, and the reinforcing yarns may comprise warp yarns and a spiral wrap yarn. The core may be soluble and removed by dissolving it. The core may be pre-wrapped with a yarn before the warp yarns are applied. The resulting reinforcing cage may be pre-shrunk before it is coated with a membrane dope. The pre-wrapped yarn may be removed, for example by dissolving it, after the reinforcing cage is coated. A precursor assembly for making a hollow fiber membrane is also provided.

Abstract: A part made of a composite is intended to be subjected, through at least a point of attachment and in cooperation with connectors, to tensile and/or compressive forces. The part includes a monolithic part having a winding of fibers oriented and embedded in a matrix, and a tubular body, wherein an attachment point, based at one end of said tubular body takes the form of a strap forming a loop turning about an axis perpendicular to the axis of the tubular body, and wherein an internal wall and/or the external wall of the loop is designed to cooperate with a portion of the connector in tension and/or in compression along one or more directions.

Abstract: Rollers faced with silicone and having no build lines are produced by wrapping pigment/filler-containing addition-curable silicone rubber strips around a roller substrate followed by curing to an integral silicone layer, wherein build lines are prevented by selecting the strips such that physical properties at the edge regions of the strip due to orientation of pigment/filler particles is minimized.

Abstract: Helically reinforced, flexible tubing or hose is formed from continuously extruded thermoplastic material helically circumferentially wound at a wrapping station around an array of bearing-supported rods that are concurrently but individually turned and are canted relative to an imaginary center axis. The tubing or hose being formed has a continuous reinforcing rib helically wound therearound and continuously integrally connected thereto. The positions of the rods are progressively altered during formation of at least a contiguous portion of the length of tubing or hose, causing the resulting tubing or hose portion to exhibit a progressive continuous change in diametrical size. The resulting tubing or hose may be transversely severed at intervals along its length, and may be flattened to form cuffs near where severed.

Abstract: A fiber reinforced core panel is formed from strips of plastics foam helically wound with layers of rovings to form webs which may extend in a wave pattern or may intersect transverse webs. Hollow tubes may replace foam strips. Axial rovings cooperate with overlying helically wound rovings to form a beam or a column. Wound roving patterns may vary along strips for structural efficiency. Wound strips may alternate with spaced strips, and spacers between the strips enhance web buckling strength. Continuously wound rovings between spaced strips permit folding to form panels with reinforced edges. Continuously wound strips are helically wrapped to form annular structures, and composite panels may combine both thermoset and thermoplastic resins. Continuously wound strips or strip sections may be continuously fed either longitudinally or laterally into molding apparatus which may receive skin materials to form reinforced composite panels.

Abstract: An industrial fabric such as an endless belt or sleeve for use in the production of nonwovens, and a method of making thereof are disclosed. The industrial fabric is produced by spirally winding strips of polymeric material, such as an industrial strapping or ribbon material, and joining the adjoining sides of the strips of material using ultrasonic welding or laser welding techniques. The fabric may then be perforated using a suitable technique to make it permeable to air and/or water.

Abstract: A permeable material compacting method includes, feeding permeable material between at least one set of rollers, decreasing a thickness of the permeable material, and wrapping the permeable material around a mandrel in a helical fashion.

Abstract: A flexible stretch hose with a wall which comprises a spirally wound profile (1; 11; 21) in a plastic material. Consecutive windings of the profile are secured to each other by means of a weld. The profile comprises, in cross-section, at least one bottom section (2; 12) and at least one rib section (4; 14; 24), wherein the rib section of the profile, relative to the bottom section, also forms a protrusion of the wall of the hose which gives the hose a predetermined hub strength. The profile comprises an unfoldable section (5; 15; 25) provided in order to be unfolded under the influence of a tensile; force in the axial direction of the hose, thereby allowing an extension of the hose, wherein the unfoldable section comprises at least two profile sections lying loosely against each other, which sections are interconnected at one end.