FR2840246A1 - Producing reinforced thermoplastic composite molding, heats thermoplastic panel surfaces selectively for thermoforming and bonding of reinforcement - Google Patents

Producing reinforced thermoplastic composite molding, heats thermoplastic panel surfaces selectively for thermoforming and bonding of reinforcement Download PDF

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Publication number
FR2840246A1
FR2840246A1 FR0206519A FR0206519A FR2840246A1 FR 2840246 A1 FR2840246 A1 FR 2840246A1 FR 0206519 A FR0206519 A FR 0206519A FR 0206519 A FR0206519 A FR 0206519A FR 2840246 A1 FR2840246 A1 FR 2840246A1
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Prior art keywords
reinforcement
mold
thermoplastic material
temperature
piece
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FR0206519A
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FR2840246B1 (en
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David Chirat
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Chomarat Composites SAS
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Chomarat Composites SAS
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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
    • 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
    • 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
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/023—Half-products, e.g. films, plates
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/006—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor for making articles having hollow walls
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/16—Lining or labelling
    • B29C51/162—Lining or labelling of deep containers or boxes
    • 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
    • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
    • B29C70/086—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers and with one or more layers of pure plastics material, e.g. foam layers
    • 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
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
    • 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
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/465—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating by melting a solid material, e.g. sheets, powders of fibres
    • 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
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/001—Shaping in several steps
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
    • B29C51/082—Deep drawing or matched-mould forming, i.e. using mechanical means only by shaping between complementary mould parts
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/42—Heating or cooling
    • B29C51/421—Heating or cooling of preforms, specially adapted for thermoforming
    • B29C51/422—Heating or cooling of preforms, specially adapted for thermoforming to produce a temperature differential
    • B29C51/423—Heating or cooling of preforms, specially adapted for thermoforming to produce a temperature differential through the thickness of the preform
    • 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
    • B29C65/022—Particular heating or welding methods not otherwise provided for
    • B29C65/028—Particular heating or welding methods not otherwise provided for making use of inherent heat, i.e. the heat for the joining comes from the moulding process of one of the parts to be joined
    • 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
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0094—Geometrical properties
    • B29K2995/0096—Dimensional stability
    • 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
    • B29L2009/00—Layered products
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/10—Building elements, e.g. bricks, blocks, tiles, panels, posts, beams
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3044—Bumpers
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/60—Multitubular or multicompartmented articles, e.g. honeycomb
    • B29L2031/601—Multi-tubular articles, i.e. composed of a plurality of tubes
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/12—Deep-drawing

Abstract

The thermoplastic panel (1) is heated. One surface (1a) is heated for thermoforming, the other surface (1b) is heated above the fusion temperature, but avoiding degradation. In the mold (5) the first surface is positioned against the wall (3) of the cavity (4). It is thermoformed. Reinforcement (7) is applied to the other surface (1b) still above its fusion temperature. It is similarly-shaped, made of the same material and pre-heated above the fusion temperature, without causing thermal degradation. An opposite mold (11) is applied against the reinforcement, which is welded to the thermoformed molding, still above the fusion point. The assembly is cooled in the mold to cause setting. Thermoforming is achieved by a reduction of air pressure in the mold. The mold cavity and that of the opposite mold, are selected such that after application of the latter, spaces (12) remain between reinforcement and the panel (1), welding only being effected locally. The reinforcement is a sheet of thermoplastic with first and second layers of parallel reinforcing fibers, the first layer being orientated at right angles to the second. The reinforcement is a thermoplastic film with a network of tensile threads combined with thermoplastic threads. An Independent claim is included for composite moldings produced as described.

Description

largeur totale est comprise entre 60 et 250 millimetres.total width is between 60 and 250 millimeters.

La presente invention est relative au domaine technique des materiaux composites. Plus particulierement, ['objet de ['invention concerne un nouveau pro cede pour mettre en forme et renforc er une piece de matiere thermoplastique, ainsi que les pieces composites renforcees et en forme susceptibles d'etre obtenues par un tel procede. De nombreux secteurs d'activite, tels que les domaines de l'emballage, de l'industrie automobile, ou encore de l'industrie du batiment, utilisent des pieces en matiere thermoplastique de forme variee. Une grande partie de ces pieces vent obtenues par thermoformage, procede regroupant differentes techniques permettant, a partir de pieces de matiere thermoplastique en forme generale de plaque, d'obtenir des pieces en forme d'epaisseur quasicons/ante. Cette technique, largement utilisee, comprend, comme etape principale, une etape de mise en forme d'une plaque de matiere thermoplastique prealablement chauffee a une temperature suffisante pour autoriser sa deformation. Cette mise en forme peut etre effectuee par differents moyens, par exemple par estampage de la plaque entre un moule et un contre-moule ou bien en positionnant la plaque sur un moule dans lequel une depression est appliquee, afin de venir plaquer par aspiration la piece composite contre les parois de  The present invention relates to the technical field of composite materials. More particularly, the object of the invention relates to a new process for shaping and reinforcing a piece of thermoplastic material, as well as the reinforced and shaped composite pieces capable of being obtained by such a process. Many sectors of activity, such as the packaging, automotive and building industries, use parts made of thermoplastic material of various shapes. A large part of these parts are obtained by thermoforming, a process grouping together different techniques making it possible, from parts of thermoplastic material in general plate form, to obtain parts in the form of thickness quasicons / ante. This widely used technique includes, as the main step, a step of shaping a thermoplastic material plate previously heated to a temperature sufficient to allow its deformation. This shaping can be carried out by different means, for example by stamping the plate between a mold and a counter-mold or else by positioning the plate on a mold in which a vacuum is applied, in order to press the part by suction. composite against the walls of

l'empreinte du motile.the motile imprint.

Ces techniques de thermoformage de pieces thermoplastiques, bien connues de l'homme de ['art, presentent differents avantages, tels que la mise en ceuvre d'outillage de faible cout et la possibilite de fabriquer des pieces de dimension relativement importante et ce a des cadences plus rapides qutavec des technologies mises en aeuvre sur les matieres thermodurcissables. Neanmoins, cette technique presente un inconvenient majeur qui reside dans les faibles proprietes mecaniques des pieces en forme obtenues. Les solutions proposees par l'art anterieur, consistent essentiellement, a renforcer la piece en forme de plaque, destinee a etre thermoformee. Pour cela, il est par exemple propose de co-extruder la matiere thermoplastique avec des fibres de renfort, le plus souvent des fibres de verre courses, longues ou continues. Cependant, de telles solutions ne donnent pas entiere satisfaction, car elles generent des defauts d' aspect a la surface des pieces thermoformees obtenues. De plus, la presence des fibres peut gener l'etirement de la matiere thermoplastique lors du thermoformage. Par ailleurs, de telles techniques entranent des modifications importantes du procede de thermoformage, notamment ['augmentation des temperatures de transformation utilisees et la necessite de mettre en ccuvre un moule et un contre-moule a des pressions plus elevees qui se  These techniques for thermoforming thermoplastic parts, well known to those skilled in the art, have various advantages, such as the implementation of low cost tools and the possibility of manufacturing parts of relatively large size and this at faster rates than with technologies used on thermosetting materials. However, this technique has a major drawback which resides in the weak mechanical properties of the shaped parts obtained. The solutions proposed by the prior art essentially consist in reinforcing the piece in the form of a plate, intended to be thermoformed. For this, it is for example proposed to co-extrude the thermoplastic material with reinforcing fibers, most often short, long or continuous glass fibers. However, such solutions are not entirely satisfactory, since they generate appearance defects on the surface of the thermoformed parts obtained. In addition, the presence of fibers can generate the stretching of the thermoplastic during thermoforming. In addition, such techniques entail significant modifications to the thermoforming process, in particular the increase in processing temperatures used and the need to implement a mold and a counter mold at higher pressures which

rapprochent des pressions utilisees en thermocompression.  approximate the pressures used in thermocompression.

Dans ce contexte, la presente invention se propose de fournir un nouveau procede pour mettre en forme et renforcer une piece de matiere thermoplastique, ledit procede permettant d'ameliorer les proprietes mecaniques de la piece obtenue, tout  In this context, the present invention proposes to provide a new process for shaping and strengthening a piece of thermoplastic material, said process making it possible to improve the mechanical properties of the piece obtained, while

en conservant un aspect de surface de la piece satisfaisant.  retaining a satisfactory surface appearance of the part.

Un autre objet de ['invention, est de proposer un procede qui soit egalement facile a mettre en ccuvre, utilisant un outillage proche de celui mis en couvre dans les techniques de thermoformage plastique, pouvant etre applique a des cadences rapides  Another object of the invention is to propose a process which is also easy to implement, using a tool close to that used in plastic thermoforming techniques, which can be applied at rapid rates.

et permettant de fabriquer des pieces de grande dimension.  and making it possible to manufacture large pieces.

Pour atteindre de tels objectifs, le procede pour mettre en forme et renforcer une piece de matiere thermoplastique selon ['invention, comprend successivement les etapes suivantes: a) chauffer une piece de matiere thermoplastique en forme generale de plaque, une premiere grande face de la piece etant chauffee a une temperature autorisant son thermoformage ulterieur et la deuxieme grande face a une temperature superieure a la temperature de fusion de la matiere thermoplastique et inferieure a la temperature de degradation de ladite matiere; b) placer ladite piece ainsi chauffee sur un motile, la premiere face etant destinee a etre positionnee contre les parois de l'empreinte du moule et thermoformer la piece; c) sur au moins une partie de la deuxieme grande face de la piece ainsi thermoformee, ladite face etant toujours a une temperature superieure a la temperature de fusion de la matiere thermoplastique, appliquer un renfort en forme generale de plaque a base de fibres de renfort et d'une matiere thermoplastique identique a celle de la piece, ledit renfort ayant ete prealablement chauffe a une temperature superieure a la temperature de fusion de la matiere thermoplastique et inferieure a sa temperature de degradation; d) sur le renfort, appliquer un contre-moule avec une pression suffisante pour assurer la mise en forme du renfort et son soudage avec la piece thermoformee, la temperature du renfort et celle de la deuxieme face de la piece etant toujours a une temperature superieure a la temperature de fusion de la matiere thermoplastique; e) ['ensemble piece thermoformee/renfort maintenu entre le moule et le contremoule est refroidi pour obtenir le durcissement de la matiere thermoplastique. La presente invention a egalement pour objet les pieces composites renforcees  To achieve such objectives, the method for shaping and reinforcing a piece of thermoplastic material according to the invention successively comprises the following steps: a) heating a piece of thermoplastic material generally in the form of a plate, a first large face of the part being heated to a temperature allowing its subsequent thermoforming and the second large face at a temperature above the melting temperature of the thermoplastic material and below the degradation temperature of said material; b) placing said piece thus heated on a motile, the first face being intended to be positioned against the walls of the mold cavity and thermoforming the piece; c) on at least part of the second large face of the piece thus thermoformed, said face always being at a temperature above the melting temperature of the thermoplastic material, apply a reinforcement in the general form of a plate based on reinforcing fibers and of a thermoplastic material identical to that of the part, said reinforcement having been previously heated to a temperature higher than the melting temperature of the thermoplastic material and lower than its degradation temperature; d) on the reinforcement, apply a counter-mold with sufficient pressure to ensure the shaping of the reinforcement and its welding with the thermoformed part, the temperature of the reinforcement and that of the second face of the part being always at a higher temperature at the melting temperature of the thermoplastic; e) [the thermoformed piece / reinforcement assembly maintained between the mold and the countermold is cooled to obtain the hardening of the thermoplastic material. The present invention also relates to reinforced composite parts

et en forme susceptibles d'etre obtenues selon le procede ci-dessus.  and in shape capable of being obtained according to the above process.

Diverses autres caracteristiques ressortent de la description faite cidessous en  Various other characteristics will emerge from the description given below in

reference aux dessins annexes qui montrent, a titre d'exemples non limitatifs, des  reference to the accompanying drawings which show, by way of nonlimiting examples,

formes de realisation de ['objet de ['invention.  embodiments of the object of the invention.

Les Fig. 1, 2, 3 et 5 vent des vues schematiques des etapes du procede selon  Figs. 1, 2, 3 and 5 show schematic views of the process steps according to

1 5 ['invention.The invention.

La Fig. 4 est une vue en perspective partiellement arrachee d'un exemple de  Fig. 4 is a partially cutaway perspective view of an example of

renfort pouvant etre utilise dans le procede selon ['invention.  reinforcement which can be used in the process according to the invention.

La Fig. 6 represente une piece composite en forme et renforcee obtenue selon  Fig. 6 represents a shaped and reinforced composite part obtained according to

le procede de ['invention.the method of the invention.

La Fig. 7 illustre une variante du procede selon ['invention.  Fig. 7 illustrates a variant of the method according to the invention.

Le procede selon ['invention comporte une premiere etape a) consistent a chauffer une piece 1 de matiere thermoplastique en forme de plaque, destinee a etre mise en forme, puis renforcee. Par piece de matiere thermoplastique, on entend une piece fabriquee a partir d'une matiere thermoplastique telle que le polypropylene, le polyethylene haute densite, le polyethylene basse densite, ltethylenvinylacetate (EVA), le polystyrene, le poly(methacrylate de methyle), le poly(chlorure de vinyle) (PVC), les polyamides ou les polycarbonates. Bien entendu, ces polymeres thermoplastiques peuvent etre combines avec differents additifs du type plastifiants, tensioactifs, lubrifiants, anti-oxydants, colorants, opascifiants, absorbeurs W. agents gonflants, charges minerales ou organiques, afin de modifier leurs caracteristiques. I1 est egalement possible d'utiliser des pieces fabriquees a partir d'un melange de  The method according to the invention comprises a first step a) consisting in heating a piece 1 of thermoplastic material in the form of a plate, intended to be shaped and then reinforced. The term “piece of thermoplastic material” means a piece made from a thermoplastic material such as polypropylene, high density polyethylene, low density polyethylene, ethylenvinylacetate (EVA), polystyrene, poly (methyl methacrylate), poly (vinyl chloride) (PVC), polyamides or polycarbonates. Of course, these thermoplastic polymers can be combined with different additives such as plasticizers, surfactants, lubricants, antioxidants, colorants, opascifiers, absorbents, swelling agents, mineral or organic fillers, in order to modify their characteristics. It is also possible to use parts made from a mixture of

polymeres thermoplastiques ci-dessus mentionnes.  above mentioned thermoplastic polymers.

La piece de matiere thermoplastique de depart est en forme generale de plaque et presente, par exemple, une epaisseur de 1 a 50 mm. Le chauffage de ladite piece peut etre effectue par differents moyens, tels que par conduction, convection ou radiation. La piece thermoplastique est generalement maintenue dans un cadre 2 de maintien et de support pour etre soumise a un chauffage, avantageusement en la placant entre deux rampes a rayonnement infra-rouge, afin de chauffer les deux grandes faces la et lb de ladite piece. L'une de ses grandes faces, par exemple la face la est destinee a etre positionnee contre les parois 3 de l'empreinte 4 du moule 5 servant ulterieurement dans ltetape de thermoformage. Cette premiere grande face la  The starting piece of thermoplastic material is generally in the form of a plate and has, for example, a thickness of 1 to 50 mm. The heating of said room can be carried out by various means, such as by conduction, convection or radiation. The thermoplastic part is generally held in a support and support frame 2 to be subjected to heating, advantageously by placing it between two ramps with infrared radiation, in order to heat the two large faces 1a and 1b of said piece. One of its large faces, for example the face 1a, is intended to be positioned against the walls 3 of the cavity 4 of the mold 5 used subsequently in the thermoforming step. This first big face

est chauffee a une temperature suffisante pour autoriser son thermoformage ulterieur.  is heated to a temperature sufficient to authorize its subsequent thermoforming.

Bien entendu, la temperature de chauffage doit etre inferieure a la temperature de degradation de la matiere thermoplastique. Le chauffage sera, par exemple, effectue a une temperature comprise entre la temperature de ramolissement et la temperature  Of course, the heating temperature must be lower than the degradation temperature of the thermoplastic material. The heating will, for example, be carried out at a temperature between the softening temperature and the temperature

de fusion de la matiere thermoplastique.  of fusion of the thermoplastic material.

La deuxieme grande face lb, quant a elle, est destinee a etre mise ulterieurement en contact avec un renfort 7 et doit etre chauffee a une temperature superieure a la temperature de fusion de la matiere thermoplastique et bien entendu, inferieure a la temperature de degradation de cette derriere, de maniere a permettre le soudage de la piece au renfort 7, tel que cela sera explique dans la suite de la  The second large face 1b, for its part, is intended to be brought into subsequent contact with a reinforcement 7 and must be heated to a temperature above the melting temperature of the thermoplastic material and of course, below the degradation temperature of this behind, so as to allow the welding of the part to the reinforcement 7, as will be explained in the rest of the

description. Avantageusement, cette deuxieme face lb sera chauffee a une  description. Advantageously, this second face 1b will be heated to a

temperature legerement superieure a la temperature de fusion de la matiere thermoplastique, par exemple a une temperature de 5 a 20 C superieure a la temperature de fusion de la matiere thermoplastique. L'etape b) du procede, consiste a placer ladite piece ainsi chauffee sur un motile, de sorte que la premiere face la de la piece 1 soit placee en face de ltempreinte 4 du moule 5. L'etape de thermoformage est avantageusement effectuee en appliquant une depression 6 sur le moule 5. Cette depression permet d' aspirer la plaque 1 dans l ' empreinte 4 du moule 5 en etirant et deformant la matiere thermoplastique pour venir plaquer la face la de la piece 1 contre les parois 3 de l'empreinte 4. Comme le montre la Fig. 2, la piece 1 adopte la forme de l'empreinte 3, correspondent a la forme desiree pour la piece composite finale. Bien entendu, une autre technique de thermoformage, tel que ltestampage pourra^t etre utilisee, la seule condition a respecter etant de conserver pour la face lb de la piece 1 une temperature superieure a la temperature de fusion de la matiere  temperature slightly higher than the melting temperature of the thermoplastic material, for example at a temperature of 5 to 20 C higher than the melting temperature of the thermoplastic material. Step b) of the method consists in placing said piece thus heated on a motile, so that the first face of the piece 1 is placed opposite the imprint 4 of the mold 5. The thermoforming step is advantageously carried out in applying a depression 6 on the mold 5. This depression makes it possible to aspirate the plate 1 in the cavity 4 of the mold 5 by stretching and deforming the thermoplastic material so as to press the face of the piece 1 against the walls 3 of the fingerprint 4. As shown in Fig. 2, the part 1 adopts the shape of the imprint 3, correspond to the desired shape for the final composite part. Of course, another thermoforming technique, such as stamping could be used, the only condition to be respected being to keep for the side lb of the piece 1 a temperature higher than the melting temperature of the material.

thermoplastique, pour la mise en ccuvre des etapes ulterieures c) et d).  thermoplastic, for the implementation of subsequent stages c) and d).

L'etape c) consiste a positionner sur la piece 1 ainsi thermoformee, un renfort 7. Ce renfort 7 peut etre prevu pour renforcer la totalite de la piece 1 et sera done applique sur toute la surface lb ou bien pour n'effectuer d'un renfort local et sera alors applique que sur la partie concernee de la face lb. Ce renfort egalement en forme generale de plaque est compose, d'une part, de fibres de renfort et, d'autre  Step c) consists in positioning on the piece 1 thus thermoformed, a reinforcement 7. This reinforcement 7 can be provided to reinforce the whole of the piece 1 and will therefore be applied to the entire surface 1b or else to effect a local reinforcement and will then be applied only on the affected part of the face lb. This reinforcement also in general plate form is composed, on the one hand, of reinforcing fibers and, on the other

part, d'une matiere thermoplastique identique a celle constitutive de la piece 1.  part, of a thermoplastic material identical to that constituting the part 1.

Differents renforts 7 pourront etre utilises. Generalement, un tel renfort comporte au moins une nappe fibreuse constituee de fibres de renfort, telles que des fibres de verre, carbone ou aramide, eventuellement en melange. Une telle nappe de fibres peut se presenter sous la forme d'un tissu ou encore d'un non-tisse, les fibres pouvant etre orientees de facon mono, bi ou pluri directionnelle. Ce reseau fibreux est allie a une matrice de matiere thermoplastique, se presentant par exemple sous la forme d'un film auquel les fibres vent intimement liees. De facon avantageuse, on utilisera un renfort homogene dans lequel les fibres vent comelees a la matiere thermoplastique. Le renfort presente de facon avantageuse une epaisseur comprise entre 0,1 a lOmm. A titre d'exemple, la Fig. 4 illustre un exemple de renfort 7 qui se compose d'une feuille 8 en matiere thermoplastique associee a une premiere nappe 9 de fils de renfort s'etendant parallelement entre eux et a une deuxieme nappe 10 de fils de renfort paralleles entre eux et s'etendant transversalement a la premiere nappe 9 sans entrelacements. Selon une autre variante, un tel renfort ne pourra comporter qu'une senle nappe de fils de renfort stetendant parallelement entre eux, cesdits fils de renfort pouvant etre cdmeles avec des fils de matiere thermoplastique de meme nature ou de nature differente que la matiere constitutive du film 8. Les nappes peuvent etre constituees de fils jointifs ou bien de fils disposes en faisceaux regulierement espaces. Le film 8 peut presenter une epaisseur comprise entre 25 et 1 200,um, sa masse surfacique pouvant etre comprise entre 20 et 1 000 g/m2. Le cas echeant, les fils constitutifs des nappes peuvent etre textures. Le film 8 et le reseau de fils vent intimement lies de sorte que les fils vent imprimes au moins pour partie dans l' epaisseur du film 8 sans qut il en resulte un etat de surface deforme. De tels renforts vent realises selon des techniques classiques, par exemple par calandrage a chaud  Different reinforcements 7 can be used. Generally, such a reinforcement comprises at least one fibrous sheet made up of reinforcing fibers, such as glass fibers, carbon or aramid, possibly in a mixture. Such a sheet of fibers can be in the form of a fabric or even a nonwoven, the fibers being able to be oriented in a mono, bi or multi-directional manner. This fibrous network is combined with a matrix of thermoplastic material, for example in the form of a film to which the fibers are intimately linked. Advantageously, a homogeneous reinforcement will be used in which the fibers are entangled with thermoplastic material. The reinforcement advantageously has a thickness of between 0.1 to 10 mm. By way of example, FIG. 4 illustrates an example of reinforcement 7 which consists of a sheet 8 of thermoplastic material associated with a first ply 9 of reinforcing threads extending parallel to each other and to a second ply 10 of reinforcing threads parallel to each other and s' extending transversely to the first ply 9 without interleaving. According to another variant, such a reinforcement may only comprise a ply of reinforcement son stetendant parallel to each other, said reinforcement son being able to be coupled with son of thermoplastic material of the same nature or of a different nature than the material constituting the film 8. The sheets may be made up of contiguous threads or else of threads arranged in regularly spaced bundles. The film 8 can have a thickness of between 25 and 1,200 μm, its surface mass possibly being between 20 and 1,000 g / m2. If necessary, the constituent threads of the sheets can be textured. The film 8 and the network of wires are intimately linked so that the wind wires are printed at least partly in the thickness of the film 8 without resulting in a deformed surface state. Such wind reinforcements produced according to conventional techniques, for example by hot calendering

dans des conditions de temperature et de pression bien connues de l'homme de ['art.  under conditions of temperature and pressure well known to those skilled in the art.

Le renfort 7 utilise dans le procede selon ['invention se caracterise par une faculte de deformation elastique lui donnant une aptitude a la conformation lors de l'etape  The reinforcement 7 used in the method according to the invention is characterized by a faculty of elastic deformation giving it an aptitude for conformation during the step

ulterieure d).d).

Cette etape d) consiste a appliquer sur le renfort 7 un contre-moule 11 avec une pression suffisante pour assurer la mise en forme du renfort 7 et son soudage a la piece 1 thermoformee. Il est important qu'entre l'etape a) de chauffage de la piece 1 et l'etape d) de compression, la temperature du renfort ainsi que celle de la deuxieme face de la piece restent tonjours superieure a la temperature de fusion de la matiere thermoplastique. C'est pourquoi, les differentes etapes a) a d) vent enchanees rapidement, afin d'eviter un refroidissement trop important des deux elements a associer. Le renfort prechauffe 7 est done positionne sur la piece 1 thermoformee, immediatement apres la mise en forme de celle-ci, puis le contre-moule 11, egalement appele poincon est aussitOt descendu. La pression appliquee sur le poincon, lorsque le moule 5 et son contremoule 11 vent en position fermee comme illustre a la Fig. 5 est comprise, par exemple, entre O,l.lOs et 106 Pa,  This step d) consists in applying to the reinforcement 7 a counter-mold 11 with sufficient pressure to ensure the shaping of the reinforcement 7 and its welding to the thermoformed part 1. It is important that between step a) of heating of the piece 1 and step d) of compression, the temperature of the reinforcement as well as that of the second face of the piece always remain higher than the melting temperature of the thermoplastic material. This is why, the different steps a) to d) are quickly enchanced, in order to avoid excessive cooling of the two elements to be combined. The preheated reinforcement 7 is therefore positioned on the thermoformed part 1, immediately after the latter is shaped, then the counter-mold 11, also called the punch, is immediately lowered. The pressure applied to the punch, when the mold 5 and its countermold 11 are in the closed position as illustrated in FIG. 5 is comprised, for example, between 0.110.sup.106 Pa,

avantageusement egale a 0,5.105 Pa.advantageously equal to 0.5.105 Pa.

L'elongation de la matiere thermoplastique lors de l'etape de thermoformage pouvant entraner de legeres differences d'epaisseur, lthomme du metier pourra prevoir d'adapter le contre-moule 11 en consequence, afin d'obtenir un bon soudage  As the elongation of the thermoplastic during the thermoforming step can result in slight differences in thickness, the skilled person may plan to adapt the counter mold 11 accordingly, in order to obtain good welding

sans perturber ['aspect de surface de la piece.  without disturbing the surface appearance of the part.

La piece renforcee en forme ainsi obtenue est ensuite refroidie entre le moule 5 et le contre-moule 11 toujours en position fermee. Puis la piece est enfin demoulee et eventuellement decoupee en fonction des dimensions de ['article final desire. La Fig. 6 montre une vue en coupe schematique d'une piece composite I obtenue selon le procede de ['invention. Cette piece composite I est composee d'une part de la piece 1 thermoplastique et du renfort 7 intimement lies et tous deux mis en forme  The piece reinforced in shape thus obtained is then cooled between the mold 5 and the counter-mold 11 still in the closed position. Then the piece is finally unmolded and possibly cut according to the dimensions of the desired final article. Fig. 6 shows a schematic sectional view of a composite part I obtained according to the method of the invention. This composite part I is composed on the one hand of the thermoplastic part 1 and of the reinforcement 7 which are intimately linked and both are shaped

selon la forme imposee par le moule 5 et son contre-moule 11.  according to the shape imposed by the mold 5 and its counter-mold 11.

Selon un mode de realisation prefere, on pourra utiliser un moule 5 et un contre-moule 11 dont les empreintes et contre empreintes ne vent pas exactement complementaires. L'utilisation d'une empreinte et d'une contreempreinte non congruantes permet, comme illustre a la Fig. 7, d'effectuer un soudage local entre le renfort 7 et la piece 1 en menageant des espacements 12 entre ces deux elements. La presence de tels espacements 12 permet d'ameliorer la rigidite de la piece composite  According to a preferred embodiment, it will be possible to use a mold 5 and a counter-mold 11 whose imprints and counterprints are not exactly complementary. The use of a non-congruent impression and counter impression allows, as illustrated in FIG. 7, to carry out local welding between the reinforcement 7 and the part 1 by providing spacings 12 between these two elements. The presence of such spacings 12 makes it possible to improve the rigidity of the composite part

S en forme renforcee obtenue.S in reinforced form obtained.

Les pieces composites en forme renforcees susceptibles d'etre obtenues par le present procede se distinguent des pieces connues de l' art anterieur par leurs proprietes mecaniques ameliorees alliees a un etat de surface satisfaisant. Il faut remarquer qutil est essentiel dans le procede selon ['invention d'effectuer le lO renforcement apres ltetape de thermoformage, afin justement d'obtenir un etat de  The composite parts in reinforced form capable of being obtained by the present process differ from the parts known from the prior art by their improved mechanical properties combined with a satisfactory surface finish. It should be noted that it is essential in the process according to the invention to carry out the reinforcement after the thermoforming step, in order precisely to obtain a state of

surface satisfaisant.satisfactory surface.

Les pieces composites selon ['invention pourront etre utilisees pour la fabrication d' articles notamment dans l'industrie automobile et le batiment, tels que des carters de protection sous moteur, des passages de roue de camion, des tablettes arrieres, des panneaux de coffre, des pieces resistantes au choc (pare-chocs, absorbeurs de choc, poutres), des pieces de protection exterieure de vehicule tout terrain, des <<hard-top > >, des logements de roue de secours, des containers, des  The composite parts according to the invention may be used for the manufacture of articles in particular in the automobile industry and the building industry, such as engine undercarriages, truck wheel arches, rear shelves, trunk panels. , impact-resistant parts (bumpers, shock absorbers, beams), external protection parts for all-terrain vehicles, "hard-top">, spare wheel housings, containers,

palettes, des elements de salle de bain ou des bagages.  pallets, bathroom items or luggage.

L'inventi on n' est b ien entendu pas limite e aux exempl es de crits et represente s car  The inventi on is of course not limited to exemplars of crits and represented because

diverges modifications peuvent y etre apportees sans sortir de son cadre.  various modifications can be made without departing from its scope.

Claims (5)

REVENDICATIONS 1- Procede pour mettre en forme et renforcer une piece (1) de matiere thermoplastique comprenant successivement les etapes suivantes: a) chauffer une piece (1) de matiere thermoplastique en forme generale de plaque, une premiere grande face (la) de la piece etant chauffee a une temperature autorisant son thermoformage ulterieur et la deuxieme grande face (lb) a une temperature superieure a la temperature de fusion de la matiere thermoplastique et inferieure a la temperature de degradation de ladite matiere; b) placer ladite piece (1) ainsi chauffee sur un moule (5) , la premiere face (la) etant destinee a etre positionnee contre les parois (3) de l'empreinte (4) du moule (5) et thermoformer la piece (1); c) sur au moins une partie de la deuxieme grande face (lb) de la piece (1) ainsi thermoformee, ladite face etant toujours a une temperature superieure a la temperature de fusion de la matiere thermoplastique, appliquer un renfort (7) en forme generale de plaque a base de fibres de renfort et d'une matiere thermoplastique identique a celle de la piece, ledit renfort ayant ete prealablement chauffe a une temperature superieure a la temperature de fusion de la matiere thermoplastique et inferieure a sa temperature de degradation; d) sur le renfort (7), appliquer un contre-moule (11) avec une pression suffisante pour assurer la mise en forme du renfort (7) et son soudage avec la piece (1) thermoformee, la temperature du renfort (7) et celle de la deuxieme face (lb) de la piece etant toujours a une temperature superieure a la temperature de fusion de la matiere thermoplastique; e) ['ensemble piece thermoformee/renfort maintenu entre le moule (5) et le contremoule (11) est refroidi pour obtenir le durcissement de la matiere thermoplastique. 2 - Procede selon la revendication 1, caracterise en ce qu'a ltetape b) le  1- Method for shaping and reinforcing a piece (1) of thermoplastic material successively comprising the following steps: a) heating a piece (1) of thermoplastic material in general plate form, a first large face (la) of the piece being heated to a temperature permitting its subsequent thermoforming and the second large face (lb) at a temperature above the melting temperature of the thermoplastic material and below the degradation temperature of said material; b) placing said piece (1) thus heated on a mold (5), the first face (la) being intended to be positioned against the walls (3) of the cavity (4) of the mold (5) and thermoforming the piece (1); c) on at least part of the second large face (lb) of the part (1) thus thermoformed, said face always being at a temperature higher than the melting temperature of the thermoplastic material, apply a reinforcement (7) in the form general of a plate based on reinforcing fibers and on a thermoplastic material identical to that of the part, said reinforcement having been previously heated to a temperature above the melting temperature of the thermoplastic material and lower than its degradation temperature; d) on the reinforcement (7), apply a counter mold (11) with sufficient pressure to ensure the shaping of the reinforcement (7) and its welding with the thermoformed part (1), the temperature of the reinforcement (7) and that of the second face (lb) of the part being always at a temperature higher than the melting temperature of the thermoplastic material; e) ['thermoformed piece / reinforcement assembly maintained between the mold (5) and the countermold (11) is cooled to obtain the hardening of the thermoplastic material. 2 - Method according to claim 1, characterized in that at step b) the thermoformage de la piece est obtenu par depression (6) d'air dans le moule.  thermoforming of the part is obtained by vacuum (6) of air in the mold. 3 - Procede selon la revendication 1 ou 2, caracterise en ce que l'empreinte du moule (5) et la contre-empreinte du contre-moule (11) vent choisies de facon qutapres application du contre-moule a l'etape d), il existe des espacements (12)  3 - Method according to claim 1 or 2, characterized in that the mold cavity (5) and the counter-cavity of the counter-mold (11) wind chosen so that after application of the counter-mold in step d) , there are gaps (12) entre le renfort (7) et la piece (1), le soudage ntetant effectue que localement.  between the reinforcement (7) and the part (1), ntetant welding only takes place locally. 4 - Procede selon les revendications 1 a 3, caracterise en ce que le renfort (7)  4 - Method according to claims 1 to 3, characterized in that the reinforcement (7) applique a l'etape c) se compose d'une feuille (8) en matiere thermoplastique associee a une premiere nappe (9) de fils de renfort s'etendant parallelement entre eux et a une deuxieme nappe (10) de fils de renfort paralleles entre eux et stetendant  applied to step c) consists of a sheet (8) of thermoplastic material associated with a first ply (9) of reinforcing threads extending parallel to each other and to a second ply (10) of parallel reinforcing threads between them and stetendant transversalement a la premiere nappe (9) sans entrelacement.  transversely to the first ply (9) without interlacing. - Procede selon les revendications 1 a 4, caracterise en ce que le renfort applique  - Method according to claims 1 to 4, characterized in that the reinforcement applies a l' etape c) se compose d' au moins un film (8) de matiere thermoplastique allie a au moins un reseau (9) de fils de renforts tendus, comeles avec des fils de matiere thermoplastique.  in step c) consists of at least one film (8) of thermoplastic material combined with at least one network (9) of stretched reinforcing threads, mixed with threads of thermoplastic material. 6 - Procede selon l'une des revendications 1 a 5 mis en ccuvre pour la realisation  6 - Method according to one of claims 1 to 5 implemented for the realization d' articles dans le domaine de [ 'automobile ou du batiment.  of articles in the field of automobile or building. 7 - Pieces composites (I) renforcees et en forme susceptibles d'etre obtenues selon  7 - Reinforced and shaped composite parts (I) capable of being obtained according to
FR0206519A 2002-05-28 2002-05-28 NEW PROCESS FOR FORMING AND STRENGTHENING THERMOPLASTIC PIECES Expired - Fee Related FR2840246B1 (en)

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WO2005095087A2 (en) * 2004-01-26 2005-10-13 General Electric Company Reinforced resinous article and method of making the reinforced resinous article
WO2006010409A1 (en) * 2004-07-22 2006-02-02 Decoma (Germany) Gmbh Method for machining a film
CN1914024B (en) * 2004-01-26 2011-06-29 沙伯基础创新塑料知识产权有限公司 Structurally reinforced resinous article and method of making
EP2433780A1 (en) * 2010-09-28 2012-03-28 Eurocopter Deutschland GmbH Improved automated manufacturing process for high performance composite material part
FR2982237A1 (en) * 2011-11-04 2013-05-10 Eads Europ Aeronautic Defence Structure part for aircraft, has structural layer made of composite material, and protection layer for protecting surface of structural layer and comprising thermoplastic polymeric resin matrix that comprises polyaromatic thermostable resin
WO2014096403A1 (en) * 2012-12-21 2014-06-26 Dieffenbacher GmbH Maschinen- und Anlagenbau Method for producing complex geometric structures from a plurality of moulded parts
EP2736707A4 (en) * 2011-07-27 2015-12-02 Dieffenbacher Gmbh Maschinen Methods and systems for forming reinforced composite articles having variable thickness corners
WO2021074115A1 (en) * 2019-10-16 2021-04-22 Safran Seats Method for manufacturing a finished part

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FR1377016A (en) * 1963-11-21 1964-10-31 Ici Ltd Improvements in the molding of objects
GB2088281A (en) * 1980-12-03 1982-06-09 Goodyear Aerospace Corp Fabric-reinforced Composite Material for a Flexible-walled Container and Method of Making Said Container
US4779459A (en) * 1985-02-12 1988-10-25 Flonic, S.A. Gas meter including a synthetic membrane
EP0247359A2 (en) * 1986-04-25 1987-12-02 Inoac Corporation Interior material for vehicles and method for its manufacture
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005095087A2 (en) * 2004-01-26 2005-10-13 General Electric Company Reinforced resinous article and method of making the reinforced resinous article
WO2005095087A3 (en) * 2004-01-26 2006-01-26 Gen Electric Reinforced resinous article and method of making the reinforced resinous article
AU2005228938B2 (en) * 2004-01-26 2010-03-11 Sabic Global Technologies B.V. Reinforced resinous article and method of making the reinforced resinous article
CN1914024B (en) * 2004-01-26 2011-06-29 沙伯基础创新塑料知识产权有限公司 Structurally reinforced resinous article and method of making
WO2006010409A1 (en) * 2004-07-22 2006-02-02 Decoma (Germany) Gmbh Method for machining a film
EP2433780A1 (en) * 2010-09-28 2012-03-28 Eurocopter Deutschland GmbH Improved automated manufacturing process for high performance composite material part
EP2736707A4 (en) * 2011-07-27 2015-12-02 Dieffenbacher Gmbh Maschinen Methods and systems for forming reinforced composite articles having variable thickness corners
FR2982237A1 (en) * 2011-11-04 2013-05-10 Eads Europ Aeronautic Defence Structure part for aircraft, has structural layer made of composite material, and protection layer for protecting surface of structural layer and comprising thermoplastic polymeric resin matrix that comprises polyaromatic thermostable resin
WO2014096403A1 (en) * 2012-12-21 2014-06-26 Dieffenbacher GmbH Maschinen- und Anlagenbau Method for producing complex geometric structures from a plurality of moulded parts
WO2021074115A1 (en) * 2019-10-16 2021-04-22 Safran Seats Method for manufacturing a finished part
FR3102083A1 (en) * 2019-10-16 2021-04-23 Safran Seats MANUFACTURING PROCESS OF A FINISHED PART

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