WO2025003620A1 - Procédé d'assemblage de bandes de polytéréphtalate d'éthylène biaxialement orienté - Google Patents
Procédé d'assemblage de bandes de polytéréphtalate d'éthylène biaxialement orienté Download PDFInfo
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- WO2025003620A1 WO2025003620A1 PCT/FR2024/050868 FR2024050868W WO2025003620A1 WO 2025003620 A1 WO2025003620 A1 WO 2025003620A1 FR 2024050868 W FR2024050868 W FR 2024050868W WO 2025003620 A1 WO2025003620 A1 WO 2025003620A1
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- strip
- welding
- edge
- sonotrode
- polyethylene terephthalate
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
- B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
- B29C65/087—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using both a rotary sonotrode and a rotary anvil
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
- B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
- B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
- B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces to be joined
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
- B29C66/133—Fin-type joints, the parts to be joined being flexible
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4326—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms for making hollow articles or hollow-preforms, e.g. half-shells
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/439—Joining sheets for making inflated articles without using a mould
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
- B29C66/7371—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable
- B29C66/73711—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable oriented
- B29C66/73713—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable oriented bi-axially or multi-axially
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/832—Reciprocating joining or pressing tools
- B29C66/8322—Joining or pressing tools reciprocating along one axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/10—Artificial satellites; Systems of such satellites; Interplanetary vehicles
- B64G1/1078—Maintenance satellites
- B64G1/1081—Maintenance satellites for debris removal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/222—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles for deploying structures between a stowed and deployed state
- B64G1/2221—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles for deploying structures between a stowed and deployed state characterised by the manner of deployment
- B64G1/2227—Inflating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2022/00—Hollow articles
- B29L2022/02—Inflatable articles
Definitions
- TITLE Method for assembling biaxially oriented polyethylene terephthalate strips
- the present invention relates to the field of deorbiting space debris, more precisely to such deorbiting from a deployable kit comprising an inflatable structure and a net, and, more particularly still, to a method of assembling MylarTM strips for the manufacture of such an inflatable structure.
- the INSIDeR (Innovative Net & Space Inflatable structure for active Debris Removal) system aims to safely deorbit space debris of different sizes.
- This system is a kit comprising a flexible net with high mechanical resistance serving as a capture system capable of capturing large objects and adapting to different debris morphologies and their tumbling speed and a tubular inflatable structure supporting said net serving as a net deployment system and ensuring the control and damping of debris movement.
- the inflatable structure comprises an assembly of sections, notably tubular, composed of sheets of biaxially oriented polyethylene terephthalate (BOPET) also commonly called MylarTM.
- BOPET biaxially oriented polyethylene terephthalate
- Inflatable MylarTM structures intended to be sent into space are known from the prior art and are assembled by gluing. However, gluing does not allow for a long-term resistant assembly and there is thus a risk of delamination.
- An aim of the invention is to enable the assembly of sections of an inflatable structure of a deployable kit for capturing space debris which makes it possible to obtain an inflatable structure which is resistant over the long term for use in space, preferably at least ten years, more preferably at least twenty years.
- An aim of the invention is therefore to enable the production of an inflatable structure which has good mechanical strength at very high inflation pressures, preferably at around 2 x 10 6 Pa (20 bar).
- Another aim of the invention is to enable the production of an inflatable structure which is watertight and continuous, that is to say made of a single material.
- a method of assembling a first strip of biaxially oriented polyethylene terephthalate and a second strip of biaxially oriented polyethylene terephthalate for the manufacture of an inflatable structure of a deployable kit for capturing space debris comprising the steps of: a) arranging a stack of the first strip and the second strip on a bearing face of an anvil, b) applying a sonotrode to compress said stack between a welding face of the sonotrode and the bearing face of the anvil, c) welding the first and second strips by emitting ultrasound through the stack by the sonotrode.
- - welding is carried out by performing a relative movement between the sonotrode and the stack;
- the method comprises a step a1) prior to step b) of arranging a filler material between the first strip and the second strip, said filler material melting at least partially during welding;
- the filler material is linear polyester, preferably polyethylene terephthalate and even more preferably biaxially oriented polyethylene terephthalate;
- the first strip and the second strip are parts of different biaxially oriented polyethylene terephthalate sheets
- the first strip and the second strip are parts of the same sheet of biaxially oriented polyethylene terephthalate;
- a method for manufacturing an inflatable structure of a deployable kit for capturing space debris comprising the steps of: i) assembling a first strip of biaxially oriented polyethylene terephthalate and a second strip of biaxially oriented polyethylene terephthalate by implementing the method as described above so as to form an assembly of biaxially oriented polyethylene terephthalate, ii) winding the assembly produced in step i) so as to cover a first edge of the assembly with a second edge of the assembly so as to form a tube, iii) assembling the first edge and the second edge by implementing the method as described above.
- the weld made in step i) is a shear weld and the weld made in step iii) is a peel or shear weld.
- a system for implementing the method as described above comprising:
- anvil having a support face arranged opposite the welding face of the sonotrode.
- the support face of the anvil and/or the welding face of the sonotrode have hollow areas and protruding areas;
- an inflatable structure of a deployable kit for capturing space debris comprising a first strip of biaxially oriented polyethylene terephthalate and a second strip of biaxially oriented polyethylene terephthalate assembled by welding, characterized in that the inflatable structure is capable of being inflated up to 2 x 10 6 Pa (20 bars).
- said welding is carried out by emitting ultrasound through a stack of said strips.
- Figure 1 shows a deployable kit
- Figure 2 illustrates a set of assembled sections rolled up on itself and shear welded
- Figure 3 illustrates a system for assembling biaxially oriented polyethylene terephthalate strips
- Figure 4 shows strips of shear welded sections
- Figure 5 shows the steps of a manufacturing process for an inflatable structure
- Figure 6 illustrates a system for joining biaxially oriented polyethylene terephthalate strips during a welding step
- Figure 7 shows strips of welded sections in peel
- Figure 8 illustrates a set of assembled sections rolled up on itself and welded in peel
- Figure 9 illustrates a system for joining biaxially oriented polyethylene terephthalate strips during an edge welding step of a set of sections.
- a deployable kit 100 is provided for capturing space debris.
- the deployable kit 100 comprises an inflatable structure 1 and advantageously a net 2.
- the deployable kit 100 is suitable for being deployed in space in order to capture space debris such as decommissioned satellites.
- the inflatable structure 1 Before using the kit 100, it is necessary to inflate the inflatable structure 1.
- the inflatable structure 1 is suitable for being inflated up to 2 x 10 6 Pa (20 bars). This pressure ensures that the inflatable structure 1 remains inflated in space.
- the inflatable structure 1 is composed of a plurality of sections 10. These sections 10 are made of biaxially oriented polyethylene terephthalate (BOPET) also commonly called MylarTM. This material is suitable for the temperature and pressure constraints to which the inflatable structure is subjected in space.
- BOPET biaxially oriented polyethylene terephthalate
- the inflatable structure 1 comprises a plurality of assembled sections 10.
- Figure 2 illustrates a portion of the inflatable structure 1 comprising two assembled sections 10a, 10b.
- the manufacture of the inflatable structure 1 notably comprises the assembly of the sections 10 together by welding.
- the assembly of the sections 10 by welding instead of gluing in fact makes it possible to obtain an inflatable structure 1 that is more resistant to temperature and pressure constraints in space, including as the structure ages.
- a method of manufacturing an inflatable structure 1, a method and a system 6 for assembling strips of biaxially oriented polyethylene terephthalate for the manufacture of an inflatable structure 1 will thus be described.
- the system 6 comprises an anvil 3, a sonotrode 4 and an ultrasonic generator.
- the anvil 3 is typically an anvil used during welding operations, in particular ultrasonic welding.
- the anvil 3 has a bearing face 31.
- This bearing face 31 is in particular adapted to receive one or more sheets of biaxially oriented polyethylene terephthalate for welding.
- the anvil 3 takes the form of a wheel.
- the ultrasonic generator 5 is a typical ultrasonic generator. Preferably, the ultrasonic generator 5 is adapted to emit ultrasound at a frequency between 25 kHz and 40 kHz.
- the sonotrode 4 is a metal part adapted to transmit the ultrasounds from the ultrasonic generator to a sheet (or a stack of sheets) arranged on the bearing face 31 of the anvil 3 while applying mechanical pressure to said sheet (or a stack of sheets).
- the sonotrode 4 is connected to the ultrasonic generator 5 and is adapted to emit the ultrasounds generated by the ultrasonic generator 5.
- the sonotrode 4 is a typical sonotrode 4 for ultrasonic welding.
- the welding face 41 of the sonotrode 4 is arranged opposite the bearing face 31 of the anvil 3.
- the sonotrode 4 has a welding face 41 adapted to be arranged opposite, and advantageously in contact with, one or more sheets arranged on the bearing face 31 of the anvil 3 to weld them ultrasonically.
- Sonotrode 4 is suitable for emitting ultrasound from its welding face 41.
- the sonotrode 4 takes the form of a roulette.
- the sonotrode and anvil assembly serves to concentrate the vibrations emitted by the sonotrode at the level of the material in contact with the sonotrode, in order to locally heat the material.
- the anvil not only serves as a support for the sheet(s) to be welded, but also to absorb the vibrations emitted by the sonotrode in order to ensure their concentration at the welding interface and to limit the transmission of these vibrations to the rest of the system.
- the anvil 3 and the sonotrode 4 each take the form of a wheel, which allows the sheet(s) to be scrolled for continuous ultrasonic welding. This provides high productivity, which makes the assembly process particularly interesting on an industrial scale.
- the support face 31 of the anvil 3 and/or the welding face 41 of the sonotrode 4 have hollow areas and protruding areas distributed according to a predetermined pattern.
- the support face 31 and/or the welding face 41 are therefore not smooth.
- the pattern of the rollers is defined to optimize the movement of the molten material between the anvil and the sonotrode in order to homogenize the weld. This pattern can also make it possible to ensure the positioning of a sheet of biaxially oriented polyethylene terephthalate, i.e. of a section 10, during welding since the sheet is less likely to slip and move. In addition, it allows mechanical anchoring between two strips of biaxially oriented polyethylene terephthalate simultaneously with welding so as to ensure the connection between the two strips.
- the support face 31 of the anvil 3 and/or the welding face 41 of the sonotrode 4 are smooth.
- the support face 31 of the anvil 3 and the welding face 41 of the sonotrode 4 are smooth. This has the advantage of limiting the mechanical deformations of the biaxially oriented polyethylene terephthalate sheets during welding. These deformations are not desired because they can weaken the sheet and the inflatable structure 1 obtained will be more fragile.
- step i) of assembling sections 10 is implemented.
- step i) a method of assembling strips 12, 14 of sections 10 will be implemented.
- the sections 10 are initially flat and each take the form of a sheet of biaxially oriented polyethylene terephthalate.
- Figure 4 illustrates a first section 10a and a second section 10b flat.
- a stack of a strip 12 of the first section 10a, hereinafter called first strip 12, and of a strip 14 of the second section 10b, hereinafter called second strip 14, is arranged on the bearing face 31 of the anvil 3.
- the first strip 12 and the second strip 14 are in this step a) parts of sections 10, i.e. of different biaxially oriented polyethylene terephthalate sheets.
- the sections 10a, 10b are stacked only at a part of each.
- a filler material 8 is arranged between the first strip 12 and the second strip 14.
- the filler material 8 allows the implementation of a weld of the strips 12, 14 together which is more solid.
- the filler material 8 is preferably linear polyester, preferably polyethylene terephthalate (PET) and even more preferably biaxially oriented polyethylene terephthalate.
- PET polyethylene terephthalate
- the connection between two strips 12, 14 is continuous, the inflatable structure 1 is made of a single type of material and is thus more resistant.
- the sonotrode 4 is applied to compress the stack between the welding face 41 of the sonotrode 4 and the support face 31 of the anvil 31.
- the ultrasonic generator 5 is activated so as to generate ultrasounds which are thus emitted by the sonotrode 4 from the support face 41.
- the ultrasounds are emitted at a frequency between 25 kHz and 40 kHz.
- the first strip 12 and the second strip 14 are welded by emitting ultrasounds through the stack.
- the material of the stack i.e. the first strip 12 and the second strip 14 are deformed simultaneously with welding so as to create a mechanical anchoring of the first strip 12 in the second strip 14.
- the first strip 12 in the second strip 14 are subjected to mechanical deformation. This makes it possible in particular to ensure the connection between the first strip 12 and the second strip 14 which are connected by welding and by mechanical deformation.
- the welding is carried out substantially without mechanical deformation of the first strip 12 and the second strip 14.
- the material of the first strip 12 and the second strip 14 is not weakened, which makes it possible to obtain a more resistant inflatable structure 1, less likely to disintegrate in space.
- the strips 12, 14 are less mechanically deformed, which makes it possible to obtain a more solid and resistant weld. Indeed, in this case, there is only a small deformation at the interface between the internal face of each strip 12, 14 and the filler material 8. In addition, the filler material 8 melts at least partially, making the weld more resistant.
- the weld is formed by performing a relative movement between the sonotrode 4 and the stack.
- one and/or the other of the sonotrode 4 and the anvil 3, when they are in the form of rollers, are rotated so as to cause the stack to move.
- the weld is performed along the entire length of the first strip 12 and the second strip 14.
- the welding of the first strip 12 and the second strip 14 may be a peel weld (i.e. a weld which is stressed in tension, in a direction perpendicular to the interface between the strips formed by the weld) or a shear weld (i.e. a weld which is stressed in shear, in a direction coplanar to the interface between the strips formed by the weld).
- a peel weld i.e. a weld which is stressed in tension, in a direction perpendicular to the interface between the strips formed by the weld
- a shear weld i.e. a weld which is stressed in shear, in a direction coplanar to the interface between the strips formed by the weld
- Figure 6 illustrates a system 6 and a stack of strips of sections 10a and 10b flat during a shear welding step. Strips 12, 14 of sections 10a and 10b of Figure 4 are shear welded. Shear welding in practice allows a stronger weld.
- Figure 7 illustrates strips 12, 14 welded in peel. In certain cases which will be explained later, this type of welding is easier to implement.
- sections 10 are assembled together.
- at least three sections 10 are assembled, it being understood that the number of sections can vary, this number being chosen to ensure a satisfactory compromise between the mechanical strength and the sealing of the assembly.
- all the sections 10 of the inflatable structure 1 are connected to each other, each section 10 being flat.
- the assembled sections 10 form an assembly 7 illustrated in FIGS. 4 and 7.
- the assembly 7 of FIGS. 4 and 7 comprises two sections 10a, 10b.
- a step ii) the set 7 of sections 10 is wound so as to cover a first edge 71 of the set 7 with a second edge 72 of the set 7 so as to form a tube as illustrated in FIGS. 2 and 8.
- the set 7 is wound so as to allow the implementation of a shear weld between the edges 71 and 72.
- the set 7 is wound so as to allow the implementation of a peel weld between the edges 71 and 72.
- the edges 71 and 72 are assembled by ultrasonic welding in the same manner as the strips 12 and 14 in step i).
- steps a) to c) of assembling strips are again implemented for the edges 71, 72, that is to say that the strips 12, 14 correspond to the edges 71, 72.
- step iii) consists of implementing steps a) to c) previously described by substituting the terms “first strip 12” and “second strip 14” with, respectively, “first edge 71” and “second edge 72”.
- the edges 71, 72 forming the strips are part of the same sheet of biaxially oriented polyethylene terephthalate, said sheet being the assembly 7.
- a stack of the first edge 71 and the second edge 72 is arranged on the bearing face 31 of the anvil 3.
- a filler material 8 is arranged between the first edge 71 and the second edge 72.
- the sonotrode 4 is applied to compress the stack between the welding face 41 of the sonotrode 4 and the support face 31 of the anvil 31.
- the ultrasonic generator 5 is activated so as to generate ultrasound which is thus emitted by the sonotrode 4 from the support face 41.
- the first edge 71 and the second edge 72 are welded by emitting ultrasound through the stack.
- the inflatable structure 1, or at least a part of the inflatable structure 1, is formed.
- Figure 9 illustrates the peel welding step of the edges 71 and 72. Peel welding is in this case easier to implement than shear welding.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Remote Sensing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24746009.0A EP4735236A1 (fr) | 2023-06-30 | 2024-06-28 | Procédé d'assemblage de bandes de polytéréphtalate d'éthylène biaxialement orienté |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2306936A FR3150457A1 (fr) | 2023-06-30 | 2023-06-30 | Procédé d’assemblage de bandes de polytéréphtalate d'éthylène biaxialement orienté |
| FRFR2306936 | 2023-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2025003620A1 true WO2025003620A1 (fr) | 2025-01-02 |
Family
ID=88690333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2024/050868 Ceased WO2025003620A1 (fr) | 2023-06-30 | 2024-06-28 | Procédé d'assemblage de bandes de polytéréphtalate d'éthylène biaxialement orienté |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4735236A1 (fr) |
| FR (1) | FR3150457A1 (fr) |
| WO (1) | WO2025003620A1 (fr) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016209762A1 (fr) * | 2015-06-22 | 2016-12-29 | Crites Austyn D | Joint de film mince soudé aux ultrasons, procédés et systèmes associés pour la fabrication de celui-ci |
| US9845140B2 (en) * | 2014-06-20 | 2017-12-19 | Austyn D. Crites | High altitude balloon and method and apparatus for its manufacture |
-
2023
- 2023-06-30 FR FR2306936A patent/FR3150457A1/fr active Pending
-
2024
- 2024-06-28 WO PCT/FR2024/050868 patent/WO2025003620A1/fr not_active Ceased
- 2024-06-28 EP EP24746009.0A patent/EP4735236A1/fr active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9845140B2 (en) * | 2014-06-20 | 2017-12-19 | Austyn D. Crites | High altitude balloon and method and apparatus for its manufacture |
| WO2016209762A1 (fr) * | 2015-06-22 | 2016-12-29 | Crites Austyn D | Joint de film mince soudé aux ultrasons, procédés et systèmes associés pour la fabrication de celui-ci |
Non-Patent Citations (1)
| Title |
|---|
| SNAPER A A: "Some Practical Application Parameters for the Ultrasonic Bonding, of Plastic Materials", IEEE TRANSACTIONS ON SONICS AND ULTRASONICS,, vol. SU-12, no. 1, 1 March 1965 (1965-03-01), pages 19 - 20, XP001352398 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4735236A1 (fr) | 2026-05-06 |
| FR3150457A1 (fr) | 2025-01-03 |
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