Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
  • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
  • B32B37/26—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer which influences the bonding during the lamination process, e.g. release layers or pressure equalising layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B11/00—Making preforms
  • B29B11/14—Making preforms characterised by structure or composition
  • B29B11/16—Making preforms characterised by structure or composition comprising fillers or reinforcement
• • 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
  • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
  • B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
  • B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
• • 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
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/06—Fibrous reinforcements only
  • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
  • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
  • B29C70/20—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres
• • 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
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/06—Fibrous reinforcements only
  • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
  • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
  • B29C70/20—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres
  • B29C70/202—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres arranged in parallel planes or structures of fibres crossing at substantial angles, e.g. cross-moulding compound [XMC]
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
  • B32B5/12—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by the relative arrangement of fibres or filaments of different layers, e.g. the fibres or filaments being parallel or perpendicular to each other
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
  • B29K2105/0085—Copolymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
  • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
  • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
  • B29K2105/0872—Prepregs
  • B29K2105/0881—Prepregs unidirectional
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2307/00—Use of elements other than metals as reinforcement
  • B29K2307/04—Carbon
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
  • B32B2037/0092—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding in which absence of adhesives is explicitly presented as an advantage
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
  • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
  • B32B37/26—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer which influences the bonding during the lamination process, e.g. release layers or pressure equalising layers
  • B32B2037/268—Release layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2305/00—Condition, form or state of the layers or laminate
  • B32B2305/08—Reinforcements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
  • B32B2307/206—Insulating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
  • B32B2307/21—Anti-static
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2313/00—Elements other than metals
  • B32B2313/04—Carbon
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2377/00—Polyamides

Definitions

• Multilayer element comprising a reinforcing material associated with a support layer by electrostatic bond
• the present invention relates to the technical field of reinforcing materials, adapted to the constitution of composite parts. More precisely, the invention relates to the association of a reinforcing material with a support layer by electrostatic bonding.
• the manufacture of composite parts or articles that is to say comprising, on the one hand, one or more reinforcements or fibrous webs and, on the other hand, a matrix (which is, most often, mainly of thermosetting and may include thermoplastics) may, for example, be carried out by a process called “direct” or “LCM” (of the English “Liquid Composite Molding”).
• a direct process is defined by the fact that one or more fibrous reinforcements are implemented in the "dry” state (that is to say without the final matrix), the resin or matrix, being implemented separately.
• reinforcing materials are available for use in such methods. These materials may be of the woven, nonwoven, unidirectional, one or more layers, or not include a significant portion of thermoplastic or thermosetting binder.
• the Applicant has in particular proposed intermediate materials comprising a layer of unidirectional fibers, in particular of carbon, bonded together, on each of its faces with a nonwoven of thermoplastic fibers (also called non-woven), named in the following UD veiled.
• These reinforcing materials are described in prior patent applications WO 2010/046609 and WO 2010/061114.
• these reinforcing materials are provided alone in the form of a reel or roll, without association with a support layer that can facilitate their handling. This makes it possible to reduce the waste and to simplify the dispensing devices used which do not require a device for separating the support layer and for rewinding the latter.
• Some machines designed exclusively to manage pre-impregnated unidirectional sheets may, however, support unidirectional layers known as dry (that is to say comprising not more than 10% by weight of binder), if they are delivered with a film support
• the plaintiff first tried to counter-paste its material named UD veiled with different type of support film by heating, using the hot sticky character of the thermopiastic sails.
• the plaintiff then encountered difficulties related to the adjustment of the heating temperature during laminating. Indeed, if the temperature used is too high, it then becomes impossible to separate the reinforcing material from the support film. On the other hand, if the temperature is too low, no connection is created.
• the Applicant has found that the laminating by heating has certain major drawbacks:
• the original reinforcing material is modified. Indeed, the conditions used during the lamination (heating temperature, pressure, cooling) do not necessarily correspond to the need for production of the original material. For example, during its cooling, the reinforcing material is in contact with the surface of the support film and the latter will thus print its imprint on the surface of the reinforcing material which will, in the end, have a structure different from that of origin. .
• the heating temperatures bonded to the binder used for the lamination can be high and be incompatible with many support films.
• the risk of pollution of the reinforcing material by components coming from the support is then significant, which considerably reduces the range of suitable films.
• the present invention provides a multilayer element comprising a reinforcing material suitable for producing composite parts, and a support layer.
• the reinforcing material is associated on at least one of its faces, and in particular on only one of its faces, to a support layer, this association being achieved by electrostatic forces,
• Such a mode of connection between the reinforcing material and the support layer preserves the original integrity of the reinforcing material and does not alter its initial properties.
• electrostatic charges in the context of the invention, an attraction bond is created between the reinforcing material and the support layer, giving rise to electrostatic bonds.
• This link is strong enough to maintain the support layer in position on the reinforcing material, during handling and cutting operations in particular, while subsequently allowing easy peeling between the two components, in order to be able to position the reinforcing material twist of the subsequent realization of a composite part.
• Such a mode of connection which does not involve any heating, allows to expand the range of usable support layers, eliminating the constraints in terms of thermal stability and risk of pollution of the reinforcing material.
• the invention finds its interest when the reinforcing material does not have a sticky character over a temperature range from 18 to 25 ° C, thus making it impossible to associate it with the support layer by bonding to the ambient thanks to a tack residual.
• the reinforcing material does not comprise thermosetting material or a part thermosetting material representing not more than 10% of the total mass of the reinforcing material.
• the reinforcing material is made of reinforcing fibers.
• the mass of thermoplastic material does not represent more than 10% of the total weight of the reinforcing material, and preferably represents from 0.5 to 10 % of the total mass of the reinforcing material, and preferably 2 to 6% of the total mass of the reinforcing material. It is possible, however, that the invention be applied to reinforcement materials of the prepreg type having a higher content of thermoplastic material and / or thermosetting material. By avoiding a bonding by heating, the invention preserves the integrity of the original material, without causing redesign or thermoplastic binders that may be present.
• the reinforcing material may comprise one or more fabrics, non-woven fabric (s) or unidirectional material (s).
• the reinforcing material comprises one or more non-woven fabric (s) or material (s) unidirectlonnel (s), reinforcing fibers and, in particular, carbon fibers.
• the element according to the invention is It is also possible that the reinforcing material, itself, comprises one or more layers bonded together by any appropriate means.
• the invention is applicable to any type of reinforcing material suitable for producing composite parts.
• Such materials are in particular based on glass, carbon, aramid or ceramic fibers.
• the invention is particularly suitable for reinforcing materials consisting of a sheet of unidirectional carbon fibers bonded on each of their faces to a thermoplastic binder, in particular of the non-woven type of thermoplastic fibers.
• Such reinforcing materials are in particular described in the documents EP 1125728, US 6,828,016, WO 00/58083, WO 2007/015706, WO 2006/121961 and US 6,503,856 and in the patent applications in the name of the Applicant WO 2010/046609 and WO 2010/061114, to which reference may be made for further details.
• the support layer is preferably made of an electrical insulating material.
• the support layer has a resistivity of 10 8 to 10 17 ⁇ .m, preferably 10 10 to 17 ⁇ .m.
• Such measurements are in particular carried out at 20 ° C. and with a relative humidity of 0%, preferably according to the standard IEC6G093: 1980.
• the support layer may in particular be a polymer, preferably chosen from thermoplastic polymers such as polyamides, such as polyethylene terephthalate, copolyamides, polyesters, copolyesters, or cellulose, cotton, natural silk or artificial fibers.
• the support layer may be a film, a paper or a textile, or any type of layer providing the role of support, that is to say, facilitating handling and cutting.
• the support layer has a thickness in the range of 10 to 500 microns.
• the adhesion between the support layer and the reinforcing material must be sufficient to hold the two elements in position.
• the electrostatic forces ensuring the association of the reinforcing material and the support layer preferably correspond to a peel force of 50 to 1000 mN.
• the electrostatic forces ensuring the combination of the reinforcing material and the support layer correspond, in particular, to a residual charge voltage of 0.1 to 3kV. The holding over time of these electrostatic forces is also good.
• the multilayer element is in the form of a band of width greater than or equal to 50 mm.
• the invention is of particular interest when such strips of large width must be cut, the support then being indispensable in this case.
• Such strips of several meters in length can in particular be stored in the form of roll.
• the multilayer elements selol the invention are perfectly adapted to be implemented on dispensing machines equipped with means capable of making complex cuts.
• the present invention also relates to a method of manufacturing a multilayer element according to the invention wherein the association between the reinforcing material and the support layer is carried out by subjecting the multilayer element to a static electricity generator.
• a stack of the support layer and the reinforcing material in contact with each other is placed in an electric field, generated, for example by applying a voltage of 10 to 50 kV, and preferably of 15 to 30 kV.
• the combination of the support layer and the reinforcing material is therefore done without the application of heat or pressure.
• the electric field is generated between a conducting bar connected to a positive voltage generator and a conducting bar connected to ground.
• the stack can indifferently be positioned, so that the reinforcing material faces the conductive bar connected to the positive voltage generator or that connected to ground.
• the invention also relates to a method of manufacturing a composite part made from at least one reinforcing material obtained from a multilayer element according to the invention, after having removed the support layer. Most often, the support layer is removed, after performing a cutting operation of the multilayer element, in particular in a direction not parallel to its width.
• Conventional stacking techniques and, in the case where the reinforcing material does not contain a sufficient quantity of thermoplastic and / or thermosetting material the conventional resin injection or infusion techniques will be used.
• the patent application WO 2010/046609 for more details on the techniques that can be used, reference may be made to the patent application WO 2010/046609.
• Multilayer elements according to the invention were manufactured from:
• a reinforcing material consisting of a sheet of unidirectional carbon fibers (marketed by Hexcel) Corporation under the reference HT40 and having a specific surface, of 150 g / m 2 ) bonded on each of its faces to a web of copolyamide fibers of thickness 118 ⁇ m and 6 g / m 2 (sold by the company Protechnic, 41, Avenue Montaigne, 68700 Cernay, France, under the reference 1R8D06, of 3 g / m 2 ).
• the bond is made thermally thanks to the hot tack nature of the thermoplastic web in accordance with the process described on pages 27 to 30 of application WO 2010/046509.
• a support layer consisting of a film of polyethylene terephthalate (marketed under the reference PEPOLIT 150.8 by the company EFFEGIDI INTERNATIONAL S.pA via Provinciale per Sacca, 55
• the generation of charges, and thus the obtaining of the association by electrostatic force, are carried out on 150x150 mm samples consisting of a superposition of such a reinforcing material and such a support layer.
• the two layers are guided and positioned one on the other. It is necessary to ensure the best contact of the two products before entering the area of creation of charges and thus the electrostatic bond.
• a FRASER 7300P 0-30000V positive voltage generator (to provide an adjustable voltage from 0 to 30 kV with a current of 1mA) including a 7080 static power generation bar 300mm long (cios Boussey Control) is used.
• This bar emits generator current in the form of an ion cloud.
• the bar is positioned 25mm above the sample.
• a conductive plate (aluminum angle) with a length of 140mm connected to the earth which extends parallel to the bar of electricity generation.
• This conductive plate is also located 25 mm from the sample, which is thus at equal distance from the electricity generation bar and the conductive plate.
• the length of the conductive plate is chosen such that it does not exceed the width of the sample, in order to avoid the creation of a preferential flow of ions between the bar and the plate.
• the sample is supported by two very fine nylon threads, stretched with a mass of 700g, so as to be positioned parallel to the bar and the conductive plate.
• the conductive material can indifferently face the generator bar or the conductive plate.
• the voltage selected for the generator is applied for 10s continuously.
• the bar creates a cloud of ions captured by the outer face of the plastic film (side bar generation).
• side bar generation On the opposite side (sample side reinforcement), a mirror image of the charges is formed.
• the plastic film constitutes a barrier that retains the positive charges and which, in fact, is attracted by the negative charges of the mirror image.
• the film is, therefore, "glued” against the reinforcing material by the attraction between the positive and negative charges. Such attraction occurs as soon as its applied voltage is greater or equal to 15kV.
• Residual charge voltage measurements on the sample are measured with a FRASER 715 static voltage meter. Measurements are made according to manufacturer's recommendations, with remote calibration of a charged source, grounded, then oriented orthogonal to the sample at a distance of 100mm.
• the sample is fixed on a plane support by means of a double-sided tape in contact with the reinforcing material.
• One end of the plastic film is fixed with a rigid strip of width equal to that of the film and of way that the bar is found perpendicular to the direction of the unidirectional fibers.
• a cup is integral with the bar; inside it is poured gradually water with a pipette until the separation of the film and the reinforcing material The barrette / cup / water assembly is then weighed.
• the samples are all produced at the same time and handled once, to be positioned on two nylon strands that serve as support
• Residual voltages are measured at defined time intervals. Regularly, a sample is taken for a peel test. The test being destructive, the number of samples reduces with time.
• Figure 1 shows the results of average sample voltage measurements for each survey. It should be noted that the size of the population decreases steadily (from 6 to 1 individual) over time.
• the initial charging voltage if it is at least 15 kV, has no influence on the peel performance since the test is carried out several tens of minutes after charging.
• the measured peel force is on average 11 g (107.9 mN) +/- 30%.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Composite Materials (AREA)
• Laminated Bodies (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (10)

Families Citing this family (7)

Family Cites Families (25)

• 2013
  • 2013-05-30 FR FR1354954A patent/FR3006235B1/fr active Active
• 2014
  • 2014-05-26 EP EP14731718.4A patent/EP3003706A1/de not_active Withdrawn
  • 2014-05-26 AU AU2014272962A patent/AU2014272962B2/en not_active Ceased
  • 2014-05-26 CN CN201480029923.8A patent/CN105246679B/zh not_active Expired - Fee Related
  • 2014-05-26 BR BR112015030058A patent/BR112015030058A2/pt not_active Application Discontinuation
  • 2014-05-26 JP JP2016516219A patent/JP6366206B2/ja active Active
  • 2014-05-26 RU RU2015156495A patent/RU2650136C2/ru active
  • 2014-05-26 WO PCT/FR2014/051221 patent/WO2014191667A1/fr active Application Filing
  • 2014-05-26 CA CA2911360A patent/CA2911360C/en not_active Expired - Fee Related
  • 2014-05-26 US US14/889,027 patent/US9815265B2/en active Active

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