WO2022101525A1 - Procédé pour fabriquer une structure gonflable et un cerf-volant de puissance fabriqué au moyen dudit procédé - Google Patents

Procédé pour fabriquer une structure gonflable et un cerf-volant de puissance fabriqué au moyen dudit procédé Download PDF

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Publication number
WO2022101525A1
WO2022101525A1 PCT/ES2020/070708 ES2020070708W WO2022101525A1 WO 2022101525 A1 WO2022101525 A1 WO 2022101525A1 ES 2020070708 W ES2020070708 W ES 2020070708W WO 2022101525 A1 WO2022101525 A1 WO 2022101525A1
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WO
WIPO (PCT)
Prior art keywords
piece
thermoplastic polymer
tubular
fabric
tubular body
Prior art date
Application number
PCT/ES2020/070708
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English (en)
Spanish (es)
Inventor
Ricardo Tejero Cantero
Original Assignee
Ricardo Tejero Cantero
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Ricardo Tejero Cantero filed Critical Ricardo Tejero Cantero
Priority to PCT/ES2020/070708 priority Critical patent/WO2022101525A1/fr
Publication of WO2022101525A1 publication Critical patent/WO2022101525A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/08—Bending or folding of tubes or other profiled members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H8/00—Sail or rigging arrangements specially adapted for water sports boards, e.g. for windsurfing or kitesurfing
    • B63H8/10—Kite-sails; Kite-wings; Control thereof; Safety means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H9/00—Marine propulsion provided directly by wind power
    • B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
    • B63H9/06—Types of sail; Constructional features of sails; Arrangements thereof on vessels
    • B63H9/067—Sails characterised by their construction or manufacturing process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H9/00—Marine propulsion provided directly by wind power
    • B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
    • B63H9/06—Types of sail; Constructional features of sails; Arrangements thereof on vessels
    • B63H9/069—Kite-sails for vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C3/00—Wings
    • B64C3/30—Wings comprising inflatable structural components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C3/00—Wings
    • B64C3/38—Adjustment of complete wings or parts thereof
    • B64C3/44—Varying camber
    • B64C3/46—Varying camber by inflatable elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C31/00—Aircraft intended to be sustained without power plant; Powered hang-glider-type aircraft; Microlight-type aircraft
    • B64C31/06—Kites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D17/00—Parachutes

Definitions

  • the invention generally pertains to the field of inflatable structures and, more particularly, to the manufacture of inflatable structures formed by curved tubular segments without the need for joints.
  • a first object of the present invention is a method for manufacturing a curved inflatable tubular structure, such as a power kite.
  • a second object of the present invention is a power kite made by the above method.
  • Inflatable structures are used in a wide variety of applications, including the manufacture of power kites.
  • Power kites are used to propel or support a load, for example an athlete in various sliding sports such as kitesurfing, kiteboarding, snowkiting, kitebuggy, wingsurfing, etc.
  • An inflatable power kite is made up of an essentially tubular structure formed by a leading tube with an essentially semicircular central axis that forms the leading edge, from which emerge, perpendicular to a plane containing the central axis, some reinforcing tubes or ribs that support a flexible sail. The sail thus provides lift to the athlete when there is an air current impinging on the kite in a direction that goes from the leading edge towards a trailing edge located next to the free ends of the ribs.
  • US 4,708,078 describes such an inflatable power kite.
  • the inflatable structures used for the manufacture of power kites comprise tubular bodies having two layers, respectively inside and outside.
  • the inner layer of the tubular body is formed by an air chamber made of, for example, thermoplastic polyurethane, which is configured to contain a volume of air under pressure.
  • the outer layer of the tubular body is made up of a fabric, normally a thermoplastic polymer, which constricts the air chamber housed inside it so that, when it swells, the body takes on the desired shape.
  • the outer layer is constructed with multiple segments of fabric joined together by sewing and/or gluing.
  • the need to sew or glue the fabric segments together has the drawback that it requires a large amount of labor and time.
  • joints are areas of stress concentration and, since they are the weakest part of the structure, they are especially critical. This means that the tubes used for this purpose cannot withstand high pressures. This results in the use of relatively large diameters, which negatively affects the aerodynamic resistance of the assembly.
  • the present invention solves the above problems by means of a method for manufacturing a continuous inflatable structure, without the need for seams or joints of any kind.
  • This procedure is applicable to any type of inflatable structure that you want to give the desired shape without the need for joints, although it is especially useful for the manufacture of power kites of the type used in various wind sports.
  • the tubes that make up a power kite manufactured according to the invention are more resistant compared to those currently used in conventional kites. Thanks to this greater resistance, it is possible to inflate the tubes to higher pressures and therefore use smaller diameter tubes. This makes it possible to reduce the diameter of the kite's leading edge, which implies less aerodynamic resistance, less turbulence and better behavior of the kite.
  • the step of cutting the segments and their sewing is avoided, which reduces time and costs.
  • tubular shape 1 refers to an essentially cylindrical body. It is not necessary for the essentially cylindrical body to have a circular guideline, since the guideline can have other shapes that are chosen depending on the needs. For example, in the case of a kite, the guideline may be elliptical or oval in shape to reduce aerodynamic drag. Nor is it essential that the cylindrical body be straight, as it may have a curved central axis.
  • one side of the tubular part 1 ' refers to half of the surface of the tubular part if it is cut by a plane containing its central axis.
  • the side of the tubular part can be defined as a surface formed by a strip with a width equal to half the perimeter of the tubular part arranged around a generatrix of the tubular part.
  • a length of the tubular piece is interpreted with reference to the main direction along which its central axis extends. Therefore, a section of the tubular part refers to a section of said tubular part limited by two planes perpendicular to its central axis.
  • a first aspect of the present invention is directed to a method for manufacturing an inflatable structure without seams or joints in general, where the structure comprises at least one body formed by a piece of thermoplastic polymer fabric configured to house an air chamber, of so that the piece of tissue constricts the air chamber when it swells to give the body a desired shape.
  • the process of the present invention is based on heating a portion of the surface of the piece of thermoplastic polymer fabric to a temperature higher than the glass transition temperature (T g ) but lower than the melting temperature (T f ) of said thermoplastic polymer. This causes a localized contraction of the fibers of the piece of polymer fabric thermoplastic in the portion of the heated surface, so that the shape that the body assumes when the air chamber inflates is modified.
  • T g glass transition temperature
  • T f melting temperature
  • the working temperature will therefore always be between the glass transition temperature and the melting temperature of the polymer, in this case polyester.
  • heating allows the dimensions of the heated thermoplastic polymer fabric surface portion to be altered in a simple, rapid, and seamless manner. As a consequence, the shape that the body assumes when the air chamber inflates also changes.
  • the heating temperature will be between approximately (T g - 10 e C) and (T f +10 e C).
  • this procedure is applicable to any type of inflatable structure.
  • the application of localized heating to a certain portion of the piece of fabric will cause the contraction of the fibers in that area, and the consequent deformation of the body once inflated, regardless of the initial shape of the body of the inflatable structure.
  • the method is applied to pieces of thermoplastic polymer fabric having an essentially tubular shape.
  • the piece of thermoplastic polymer fabric and the air chamber housed inside it are also essentially tubular.
  • the application of the procedure to tubular bodies is particularly advantageous because it allows modifying the shape of the bodies in a relatively simple way, or at least with a more predictable result, than with parts with more complex shapes, as described below.
  • heating can be applied to any part of the tubular part, including heating that encompasses the entire perimeter of a section of tubular body for the purpose of reducing the diameter of said section without affecting its direction.
  • heating substantially the entire surface of the tubular part leaving unheated precisely those areas where it is desired to generate a curvature.
  • a process would be carried out that would reduce the original diameter of the tubular body except in the areas where heating is not carried out and which, consequently, would be curved.
  • This possibility can be interesting in the manufacture of power kites because it can be easier to homogenize the manufacture and because it allows to play with the diameters of the tubular body.
  • the portion that is heated is located on a first side of the surface of the tubular piece of thermoplastic polymer fabric, with a second side opposite the first remaining essentially unheated. More preferably, the portion that is heated is a section of the first side of the surface of the tubular piece of thermoplastic polymer fabric. This allows the tubular body to bend towards the side where heating has occurred.
  • tubular bodies with desired curvatures from essentially straight tubular bodies simply by localized application of heat at different points of the outer fabric piece. That is, by applying the method of the invention several times, not necessarily all on the same side of the tubular body, the tubular body can be given any necessary shape without the need to join various segments together. This is particularly advantageous because the use of joints is avoided, and also because it is a much faster and simpler procedure than the conventional manufacture of the curved tubular body from several pieces of fabric sewn together.
  • the application of heat can be carried out in any way as long as it ensures that the heating is essentially localized in the desired area and that the temperature reached by said area of the piece of fabric is within the ranges described above.
  • two preferred modes of heating are described below: by contact and by air current.
  • heating is carried out by contact of the thermoplastic polymer part with a surface whose temperature is higher than the glass transition temperature but lower than the melting temperature of said thermoplastic polymer.
  • any appliance or device with a heating surface whose temperature can be controlled can be used to carry out this step.
  • said device can be an iron provided with a heating surface whose temperature is controlled by activating one or more resistances.
  • contact heat is advantageous because it allows very precise control of both the heating temperature and the limits of the heated zone. To do this, it suffices to support the heating surface against the portion of the surface of the thermoplastic polymer part to be heated for a sufficient time.
  • the temperature of the surface is variable depending on the position, so that zones of the portion of the surface of the piece of thermoplastic polymer fabric are heated to different temperatures.
  • a plate with a surface of parallelepipedal heating whose transverse dimension corresponds essentially to the width of the tubular piece of thermoplastic polymer fabric when it is deflated, and where the temperature of the plate drops from a central longitudinal band to the lateral edges.
  • the deformation of the fibers in the central zone would be greater than in the lateral zone.
  • the application of heat by contact with a heating surface of variable temperature is advantageous because it allows to control with greater precision the magnitude of the contraction at each point of the heated zone, and therefore also the final form that the swollen body would adopt.
  • a suitable specific temperature to each area of the heated portion, the appearance of wrinkles and stressed areas is avoided.
  • the heating is carried out by projecting a current of hot air against the portion of the surface of the piece of thermoplastic polymer fabric.
  • the air current can be generated through any device, such as a blower or fan equipped with heating resistances.
  • the application of heat by air current is advantageous because its application is faster and easier than by contact with a heating surface, since it allows heat to be applied without the need to deflate the body. Furthermore, in a tubular body in the swollen state, the application of heat by air current inherently implies that the generatrix of the tubular body facing the air current will be closer to the point of emission of the current than generatrices located towards one. or other side. Therefore, the heat is conveniently not applied evenly, which can be advantageous in avoiding wrinkles or stressed areas.
  • the method further comprises separating the walls of the tubular body before heating.
  • the separation of the walls of the tubular body makes it possible to ensure that the opposite side of the thermoplastic polymer piece is not heated to the one that is being heated, since this could produce an additional undesired deformation of the body.
  • the walls of the tubular body as a whole may be made up of two layers: a layer of thermoplastic polymer fabric and a layer belonging to the air chamber.
  • the air chamber can be attached to the layer of thermoplastic polymer fabric or, alternatively, it can be separate from it and constitute a different element although inserted concentrically inside it. In any case, if the air chamber is inside the piece of thermoplastic polymer at the time of heating, some heating of said air chamber will necessarily take place.
  • the thermoplastic polymer may have a glass transition temperature that is above the melting temperature of the bladder material, or the working temperature of the polymer may be above the melting temperature of the material. air chamber material.
  • the thermoplastic polymer that makes up the fabric can be polyester, while the air chamber can be made of polyurethane.
  • the air chamber can be made of polyurethane.
  • the temperature above 175 e C which is the typical melting temperature of polyurethane in the air chamber.
  • the separation of the walls of the tubular body can be carried out in any way as long as it avoids contact between the walls of the air chamber. Two preferred ways are described here: by injection of air and by insertion of a spacer strip.
  • the separation of the walls of the body is carried out by injecting air through an inlet hole at a first end of the tubular body that exits through an outlet hole at a second end. of the tubular body opposite the first.
  • This air current will cause the body to assume a shape similar to its swollen tubular shape, causing its walls to separate. In this state, not only is it ensured that the walls of the air chamber do not touch each other, but it also facilitates the evacuation of heat from the interior of the body, further reducing the temperature reached by the air chamber. Even more preferably, the injected air is cooled in order to evacuate an even greater part of the heat supplied in the heating step.
  • the use of a preferably cooled air current to separate the walls of the body is advantageous due not only to the fact that it is carried out quickly and easily, but also to the fact that it cooperates in the evacuation of the heat supplied in the heating step.
  • the separation of the walls of the body is carried out by inserting a prismatic strip along the inside of said body.
  • the slat can have any shape, although a slat with a polygonal cross-section, for example square or rectangular, is preferably chosen.
  • This way of separating the body walls is particularly advantageous when combined with an application of heat by means of a heating surface, in which case the body walls remain sandwiched between the slat and the heating surface. Furthermore, it would be possible to combine the use of a slat with the injection of an air current, which in this case would only have a cooling effect. This air current would pass through those parts of the cross section of the body that are not sandwiched between the slat and the heating surface. It would also be possible to use a hollow strip and let the cooling air pass through it.
  • any thermoplastic polymer for the piece of fabric can be used as long as the glass transition temperature from which its fibers contract is a high temperature in relation to room temperature, for example at least 60 e C or more.
  • polyester, polyethylene or nylon can be used.
  • materials such as thermoplastic polyurethane, rubber or polyvinyl chloride can be used.
  • a second aspect of the present invention is directed to a power kite where at least one of the leading tube, a trailing tube or the ribs is manufactured by the method described in the previous paragraphs.
  • a "classical" power kite comprises a curved central axis leading tube, for example semicircular, provided with reinforcing ribs that support a sail, so that the leading tube and/or the ribs can manufactured by the described procedure.
  • the kite may have a trailing edge or secondary tube, which could also be made by the method of the invention.
  • the described power kite also comprises clamps for fixing the sail to the leading tube, the trailing tube, and/or the ribs.
  • the clamps may be portions of tube with a diameter greater than that of the tube they clamp.
  • the clamp can be fixed to the tube with an adhesive, since it hardly undergoes any stress.
  • the use of clamps is advantageous because it avoids having to sew the sail to the leading tube, trailing tube, or ribs.
  • Fig. 1 shows a perspective view of a power kite made using the method of the present invention.
  • Fig. 2 shows a generic tubular body before carrying out the method of the present invention.
  • Fig. 3 shows the portion of a tubular body where the heat will be applied in the method of the invention.
  • Fig. 4 shows the tubular body deformed due to the contraction of the fibers caused by the application of heat.
  • Fig. 5 shows an example of applying heat to a tubular body by means of a current of hot air.
  • Fig. 6 shows an example of heat application to a tubular body by contact with a hot surface.
  • Fig. 7 shows a cross section of the application of heat by contact with a hot surface whose temperature is not uniform.
  • Fig. 8 shows an image under an electron microscope where the effect of applying heat to a fabric of thermoplastic polymer fibers can be seen.
  • the power kite (100) of this example which is shown in Fig. 1, is basically formed by a leading tube (110) that has a curved central axis, and from which some ribs (120) stick out perpendicularly to a plane containing the attack tube (110).
  • the ribs 120 and the leading tube 110 provide support for a sail 130 consisting of an essentially parallelepiped shaped portion of fabric.
  • the sail (130) is fixed to the leading tube (110) and to the ribs (120) by means of clamps.
  • the sail 130 is attached, for example by stitching, to various brackets surrounding the leading tube 110 or ribs 120 at different positions.
  • the use of these clamps is advantageous because it constitutes a simple and safe fixing method that does not affect in any way the inflatable structure formed by the leading tube (110) and the ribs (120).
  • Fig. 2 shows a cylindrical tubular body (1) with a circular guideline and a straight central axis.
  • the tubular body (1) is essentially formed by a piece (2) of thermoplastic polymer fabric, in this case polyester.
  • an air chamber (3) made of thermoplastic polyurethane is housed inside it during the heating process that will be described below.
  • the walls of the tubular body (1) are made up of two layers of different materials, polyester on the outside and thermoplastic polyurethane on the inside.
  • Fig. 2 also shows the surface corresponding to one side of the tubular body (1), which in this simple case corresponds to half the surface of the tubular body (1) when it is cut by means of a plane (rr) that passes through its central axis.
  • the figures show the tubular body (1) in the shape it takes when inflated, although it is understood that in the deflated state the walls of the tubular body (1) would collapse one on top of the other, adopting an essentially flat shape.
  • the tubular body (1) is shown open at the ends, although this is not an essential feature and, in fact, it is understood that in the final inflated state shown in the power kite (100) of Fig. 1 the tubular body (1) will be closed at the ends and with the air chamber (3) inflated to a pressure similar to or greater than the usual pressures used in this field.
  • the figures show the walls of the air chamber (3) always adjacent to the walls of the piece (2) of polyester fabric.
  • This fixing can be achieved in different ways, for example by sewing or directly forming the air chamber (3) by spraying the softened thermoplastic polyurethane on the inner surface of the piece (2) of polyester fabric. In any case, it is not necessary for the air chamber (3) to be fixed to the piece (2) of polyester fabric, configurations being possible in which the air chamber (3) is simply housed inside the piece (2). ) of tissue without any type of fixation.
  • Fig. 3 shows a portion (P) of the outer surface of the piece (2) of polyester fabric located inside one side of the tubular body (1).
  • the surface portion (P) comprises a single side of a central section of the tubular body (1).
  • the result of applying heat on this surface portion (P), as shown in Fig. 4, is that the fibers of the portion (P) of the tubular body (1) contract. Since the portion (P) is located only on one side of the tubular body (1), the fibers of the piece (2) of polyester fabric located on the opposite side of the tubular body (1) maintain their length, which causes that the tubular body (1) curves.
  • the temperature to which the fibers of the portion (P) of the tubular body (1) must be heated must be higher than the glass transition temperature of the polyester, but lower than the melting temperature of the polyester.
  • the heating is carried out at a temperature between 65 and 240 e C.
  • the opposite side of the tubular body (1) does not heat up, since in that case case the tubular body (1) would not bend.
  • the air chamber (3) made of thermoplastic polyurethane does not get too hot, as it could then melt. Two preferred modes of carrying out the heating are described in more detail below.
  • Fig. 5 shows a heating process by means of a hot air current directed towards the portion (P).
  • the hot air current must be emitted close enough to the tubular body (1) and have a sufficient temperature to cause the portion (P) of the polyester part (2) to heat up sufficiently as mentioned above.
  • a current of cold air is injected through the tubular body (1).
  • This current of cold air mainly fulfills two functions. First of all, it separates the walls of the tubular body (1), thus preventing the inner walls of the air chamber (3) from melting and sticking to one another.
  • Fig. 6 shows a heating process by means of contact of the portion (P) of the piece (2) of polyester fabric with a hot surface (S).
  • a slat (L) with a rectangular cross-section is inserted inside the tubular body (1) which, in the deflated state, rests on a flat face of the slat (L).
  • the hot surface (S) which in this example is flat, until it makes contact with the portion (P) of the piece (2) of polyester.
  • the strip (L) prevents the heat from passing through the tubular body (1) until it reaches the walls of the opposite side.
  • a current of cold air could also be used to evacuate heat, preferably in combination with a hollow slat (L), so that the cold air travels inside the hollow slat to ensure that the air chamber (3 ) below portion (P) of the piece (2) of polyester fabric is kept below its melting temperature.
  • Fig. 7 shows a contact heating process similar to that of Fig. 6, although in this case the temperature of the heated surface (S) varies along its transverse dimension (i.e., in a direction perpendicular to the axis).
  • the surface temperature (S) takes a maximum in a central line and decreases towards both sides.
  • the temperature adopted by the central generatrix on which the central line of the surface (S) rests will correspond to the maximum, and the temperature that adopt lateral generatrixes in relation to said central generatrix will be gradually reduced.
  • tubular body (1) is shown in a pseudo-inflated state thanks to the current of cold air in which it has a cylindrical shape
  • the application of heat by injection of hot air could be carried out carried out with the tubular body (1) deflated in a fundamentally flat state, or even with the tubular body (1) completely inflated and closed at its ends.
  • Figs. 6 and 7 shows the tubular body (1) deflated on the strip (L)
  • the application of heat by contact could be carried out with the tubular body (1) inflated and closed at its ends.
  • the heat application surface (S) be flat
  • other shapes can be used such as a complementary shape with the shape of the tubular body (1) when it is inflated (for example, tubular shape).
  • the heat can be applied in any way as long as it is ensured that the portion (P) of the piece (2) of polyester reaches its glass transition temperature and that no part of the air chamber (3 ) reaches its melting temperature.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

La présente invention concerne un procédé pour fabriquer une structure gonflable, laquelle structure comprend au moins un corps (1) formé d'une pièce (2) de tissu polymère thermoplastique configurée pour loger une chambre (3) à air, de sorte que la pièce (2) de tissu comprime la chambre (3) à air quand celle-ci se gonfle pour donner au corps (1) une forme désirée. Le procédé consiste à chauffer une partie (P) de la surface de la pièce (2) à une température supérieure à la température de transition vitreuse mais inférieure à la température de fusion du polymère thermoplastique, provoquant ainsi une contraction localisée des fibres de la pièce (2) dans la partie (P) chauffée qui modifie la forme qu'adopte le corps (1) quand la chambre (3) à air se gonfle. L'invention concerne également un cerf-volant de puissance (100) fabriqué au moyen de ce procédé.
PCT/ES2020/070708 2020-11-13 2020-11-13 Procédé pour fabriquer une structure gonflable et un cerf-volant de puissance fabriqué au moyen dudit procédé WO2022101525A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/ES2020/070708 WO2022101525A1 (fr) 2020-11-13 2020-11-13 Procédé pour fabriquer une structure gonflable et un cerf-volant de puissance fabriqué au moyen dudit procédé

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PCT/ES2020/070708 WO2022101525A1 (fr) 2020-11-13 2020-11-13 Procédé pour fabriquer une structure gonflable et un cerf-volant de puissance fabriqué au moyen dudit procédé

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US20100127427A1 (en) * 2008-11-24 2010-05-27 Gm Global Technology Operations, Inc. Preforms and methods of making the same
US20190232547A1 (en) * 2018-01-26 2019-08-01 General Electric Company Method of making 3d tube and 3d tube made thereby

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Publication number Priority date Publication date Assignee Title
JP2001232681A (ja) * 2000-02-24 2001-08-28 Sekisui Chem Co Ltd 二軸延伸熱可塑性樹脂管の曲げ加工方法
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