FR2933899A1 - ARTICLE FOR PRODUCING COMPOSITE SANDWICH PIECES BY RESIN INFUSION PROCESSES - Google Patents

ARTICLE FOR PRODUCING COMPOSITE SANDWICH PIECES BY RESIN INFUSION PROCESSES Download PDF

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Publication number
FR2933899A1
FR2933899A1 FR0854873A FR0854873A FR2933899A1 FR 2933899 A1 FR2933899 A1 FR 2933899A1 FR 0854873 A FR0854873 A FR 0854873A FR 0854873 A FR0854873 A FR 0854873A FR 2933899 A1 FR2933899 A1 FR 2933899A1
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France
Prior art keywords
textile
core
article
layer
article according
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Granted
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FR0854873A
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French (fr)
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FR2933899B3 (en
Inventor
Thomas Roure
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Chomarat Composites SAS
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Chomarat Composites SAS
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Priority to FR0854873A priority Critical patent/FR2933899B3/en
Priority to ES200801863U priority patent/ES1068720Y/en
Priority to DE202008012572U priority patent/DE202008012572U1/en
Publication of FR2933899A1 publication Critical patent/FR2933899A1/en
Application granted granted Critical
Publication of FR2933899B3 publication Critical patent/FR2933899B3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C70/40—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
    • B29C70/48—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 the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by 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
    • 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
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/546—Measures for feeding or distributing the matrix material in the reinforcing structure
    • B29C70/547—Measures for feeding or distributing the matrix material in the reinforcing structure using channels or porous distribution layers incorporated in or associated with the product
    • 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
    • B29L2031/608—Honeycomb structures

Abstract

Article (1) destiné à la réalisation de pièces sandwich composites par des procédés d'infusion, comportant une âme centrale (2) incluant un panneau en structure (4) de nid d'abeille, caractérisé en ce qu'il comporte sur chacune des faces de l'âme, un complexe textile (10,11) incluant une couche drainante (6) et un ensemble d'au moins une couche textile de renfort (12-15). L'article (1) peut-être utilisé sous forme de panneaux rectangulaires ou pré-découpés tel un kit à assembler pour réaliser des pièces sandwich composites de grandes dimensions en infusion. Pour ce faire, il comporte des zones de débordements du ou des complexes textiles (10-11) pour faciliter la construction du kit et assurer le transfert des contraintes mécaniques au niveau des différentes jonctions de panneaux que la pièce finie aura nécessité.An article (1) for the production of composite sandwich parts by infusion processes, comprising a central core (2) including a structure panel (4) of honeycomb, characterized in that it comprises on each of faces of the core, a textile complex (10,11) including a draining layer (6) and a set of at least one reinforcing textile layer (12-15). The article (1) can be used in the form of rectangular panels or pre-cut such as a kit to assemble to make composite sandwich pieces of large dimensions in infusion. To do this, it includes overflow areas of the textile complex or (10-11) to facilitate the construction of the kit and ensure the transfer of mechanical stresses at the different panel junctions that the finished part will have required.

Description

-1- ARTICLE DESTINE A LA REALISATION DE PIECES SANDWICH COMPOSITES PAR DES PROCEDES D'INFUSION DE RESINE -1- ARTICLE FOR THE PRODUCTION OF COMPOSITE SANDWICH PIECES BY RESIN INFUSION METHODS

DOMAINE TECHNIQUE L'invention se rattache au domaine de l'industrie des composites, plus particulièrement de réalisation de panneaux obtenus par des procédés d'infusion de résine. Elle vise plus particulièrement une nouvelle structure de pièces sandwiches permettant de combiner les propriétés mécaniques du panneau obtenu, avec une facilité de manipulation lors des différentes étapes de fabrication. TECHNICAL FIELD The invention relates to the field of the composite industry, more particularly to the production of panels obtained by resin infusion processes. It relates more particularly to a new structure of sandwich pieces to combine the mechanical properties of the panel obtained, with ease of handling during the various stages of manufacture.

EXPOSE DE L'INVENTION L'invention concerne donc un article destiné à la réalisation de pièces sandwiches composites par des procédés d'infusion. Parmi les procédés d'infusion, on connaît en particulier les procédés d'infusion par le vide, mais aussi les procédés connus sous l'appellation RTM pour Resin Transfert Molding ou RTM light. De façon classique, ces articles comportent une âme centrale incluant un panneau qui présente une structure de nid d'abeille. Cette âme centrale confère l'épaisseur à l'article et donc au final, au produit obtenu après infusion. SUMMARY OF THE INVENTION The invention therefore relates to an article for the production of composite sandwich pieces by infusion processes. Among the infusion processes, the vacuum infusion processes are known in particular, but also the processes known by the name RTM for Resin Transfer Molding or RTM light. Conventionally, these articles comprise a central core including a panel which has a honeycomb structure. This central core confers the thickness to the article and thus ultimately to the product obtained after infusion.

Conformément à l'invention, cet article se caractérise en ce qu'il comporte sur chacune des faces de l'âme, un complexe textile incluant une couche drainante et un ensemble d'au moins une couche textile de renfort. According to the invention, this article is characterized in that it comprises on each of the faces of the core, a textile complex including a draining layer and a set of at least one reinforcing textile layer.

Autrement dit, la structure en nid d'abeille est recouverte sur ses deux faces d'un complexe incluant une couche facilitant la diffusion de la résine lors du procédé d'infusion et une ou plusieurs couches de renfort qui imprégnées de cette résine confèrent les propriétés mécaniques de renfort à l'article. De par cette superposition sandwich, le composite se comportent comme une poutre : l'épaisseur de l'âme apporte la rigidité et la résistance en flexion, les peaux composites encaissent les efforts de compression et de flexion. L'épaisseur du nid d'abeille a une influence directe sur les contraintes : il augmente l'inertie selon l'épaisseur à la puissance cube. Au final, avec une âme légère, on peut obtenir une pièce sandwich avec un rapport légèreté/rigidité très élevé. 2933899 -2- Avantageusement, l'âme comporte un film étanche en matière polymérique recouvrant au moins une des faces de la structure en nid d'abeille. Autrement dit, le nid d'abeille est ainsi approprié au procédé d'infusion, puisqu'il est ainsi rendu étanche par le film plastique qui est avantageusement soudé sur les alvéoles. On empêche ainsi toute 5 accumulation inutile de résine dans les alvéoles du nid d'abeille. In other words, the honeycomb structure is covered on both sides with a complex including a layer facilitating the diffusion of the resin during the infusion process and one or more reinforcing layers which impregnated with this resin confer the properties mechanical reinforcement to the article. By this sandwich superposition, the composite behaves like a beam: the thickness of the core provides rigidity and flexural strength, the composite skins absorb compression and bending forces. The thickness of the honeycomb has a direct influence on the stresses: it increases the inertia according to the thickness to the cube power. In the end, with a light soul, one can obtain a sandwich piece with a ratio very lightness / stiffness. Advantageously, the core comprises a tight film of polymeric material covering at least one of the faces of the honeycomb structure. In other words, the honeycomb is thus suitable for the infusion process, since it is thus sealed by the plastic film which is advantageously welded to the cells. This prevents any unnecessary build-up of resin in the cells of the honeycomb.

Avantageusement en pratique, l'âme peut comporter sur au moins une de ses deux faces une couche en un matériau non tissé, au contact duquel vient le complexe textile. Autrement dit, l'âme en nid d'abeille et plus précisément son film d'étanchéité reçoit un 10 non tissé, typiquement à base de polyester, rajouté pour faciliter l'accroche avec le complexe textile qui va le recouvrir, en particulier la couche drainante. Advantageously in practice, the core may comprise on at least one of its two faces a layer of a nonwoven material, in contact with which comes the textile complex. In other words, the honeycomb core and more specifically its sealing film receives a nonwoven, typically based on polyester, added to facilitate the bonding with the textile complex which will cover it, in particular the layer draining.

Avantageusement, la mise en place du complexe textile sur l'âme centrale peut être facilitée par la présence d'une couche d'adhésif repositionnable, présente sur le complexe 15 textile et/ou sur l'âme centrale. Ceci permet en particulier d'assembler le complexe textile et l'âme centrale directement dans le moule d'infusion, après découpe des différents éléments individuellement si nécessaire. L'assemblage est fait lors de la fabrication du panneau, avant ou après découpe des éléments individuellement. Mais le caractère repositionnable de l'adhésif permet également d'effectuer des opérations d'ajustement 20 successives lors de la manipulation dans le moule. De simple outils de découpes (ciseaux, cutter, scie sauteuse) peuvent permettre de découper des angles, arrondis et autres formes sans difficultés au niveau du complexe textile et du nid d'abeille. Advantageously, the establishment of the textile complex on the central core can be facilitated by the presence of a repositionable adhesive layer present on the textile complex and / or on the central core. This allows in particular to assemble the textile complex and the central core directly into the infusion mold, after cutting the various elements individually if necessary. The assembly is done during the manufacture of the panel, before or after cutting individual elements. However, the repositionable nature of the adhesive also makes it possible to carry out successive adjustment operations during handling in the mold. Simple cutting tools (scissors, cutter, jigsaw) can cut corners, rounds and other shapes without difficulty in the textile complex and the honeycomb.

Avantageusement en pratique, le complexe textile peut déborder de l'âme centrale, de 25 manière à permettre lors de la juxtaposition l'assemblage de différents panneaux entre eux, de juxtaposer d'assurer une continuité entre les complexes textiles sur deux panneaux adjacents, et ainsi faciliter permettre le transfert des efforts mécaniques entre deux panneaux juxtaposés. Comme le reste du complexe textile, ces débordements peuvent être adhésivés afin de faciliter la jonction des panneaux en se liant sur les 30 complexes textiles des panneaux juxtaposés. Ces débordements peuvent même être optimisés entre les deux faces de la pièce sandwich (dessus/dessous), en répartissant ces zones entre les panneaux juxtaposés. - 3 En pratique, les complexes textiles peuvent être de nature très différente en fonction de l'application recherchée. Ainsi, en plus de la couche drainante, le complexe peut comprendre une ou plusieurs couches de renfort comprises parmi le groupe comprenant : - les mats de fibres, de verre en particulier ; - les tissus ; - les nappes unies ou pluridirectionnelles ; - les non-tissés. Advantageously in practice, the textile complex may protrude from the central core, so as to allow, during the juxtaposition, the assembly of different panels between them, to juxtapose to ensure continuity between the textile complexes on two adjacent panels, and thus facilitating the transfer of mechanical forces between two juxtaposed panels. Like the rest of the textile complex, these overflows can be tacky in order to facilitate the joining of the panels by bonding to the textile complexes of the juxtaposed panels. These overflows can even be optimized between the two faces of the sandwich piece (top / bottom), by distributing these areas between the juxtaposed panels. In practice, the textile complexes can be very different in nature depending on the desired application. Thus, in addition to the draining layer, the complex may comprise one or more reinforcing layers included among the group comprising: fiber mats, in particular glass; - tissues ; - plain or multi-directional webs; - nonwovens.

DESCRIPTION SOMMAIRE DES DESSINS L'exemple illustré à la figure unique permet de visualiser la manière dont les différentes couches sont agencées entre elles avant leur assemblage. SUMMARY DESCRIPTION OF THE DRAWINGS The example illustrated in the single figure shows how the different layers are arranged between them before assembly.

MANIERE DE REALISER L'INVENTION Ainsi, l'âme centrale 2 comporte une structure en nid d'abeille 4 tel qu'en particulier celle commercialisée sous la référence NIDAPLAST 8RI par la société NIDAPLAST. Une telle structure est appréciée pour sa légèreté et ses performances mécaniques importantes en compression et cisaillement ainsi que des propriétés thermiques et acoustiques très intéressantes. La structure en nid d'abeille 4 reçoit un film étanche plastique 3 soudé sur les alvéoles typiquement à base de polyuréthane polypropylène, c'est-à-dire un matériau similaire ou identique à celui de la structure 4 en nid d'abeille. Ces films d'étanchéité 3 reçoivent par collage une couche d'un non tissé 5 typiquement à base de polyester permettant l'accroche avec les couches textiles des complexes qui seront rapportés. Les épaisseurs de l'âme centrale sont variables, de l'ordre de 5 à 80 mm. In this way, the central core 2 comprises a honeycomb structure 4 such as in particular that sold under the reference NIDAPLAST 8RI by the company NIDAPLAST. Such a structure is appreciated for its lightness and its significant mechanical performance in compression and shear as well as thermal and acoustic properties very interesting. The honeycomb structure 4 receives a sealed plastic film 3 welded to the cells typically based on polypropylene polyurethane, that is to say a material similar or identical to that of the honeycomb structure 4. These sealing films 3 receive, by gluing, a layer of a non-woven fabric 5 typically based on polyester which makes it possible to bond the complexes which will be reported with the textile layers. The thicknesses of the central core are variable, of the order of 5 to 80 mm.

Cette âme centrale 2 reçoit sur ses faces supérieure et inférieure les complexes textiles 10,11 qui comportent une première couche drainante 6. Cette couche drainante 6 peut typiquement être à base d'un tricot chaîne polyester, ou bien encore un voile de verre à filaments continus, avantageusement choisi pour ses propriétés d'aspiration de la résine. This central core 2 receives on its upper and lower faces the textile complexes 10, 11 which comprise a first draining layer 6. This draining layer 6 may typically be based on a polyester warp knit or even a filament glass wrap. continuous, advantageously chosen for its suction properties of the resin.

Cette couche drainante 6 améliore le fluage de la résine lors du procédé de l'injection. Ces deux complexes textiles sont assemblés sur l'âme centrale par un adhésif repositionnable, avec la couche drainante au contact du nid d'abeille (du non tissé 2933899 -4- polyester). Cette couche drainante est assemblée par un adhésif repositionnable 7 sur l'âme centrale 2. This draining layer 6 improves the creep of the resin during the injection process. These two textile complexes are assembled on the central core by a repositionable adhesive, with the draining layer in contact with the honeycomb (nonwoven 2933899 -4- polyester). This draining layer is assembled by a repositionable adhesive 7 on the central core 2.

Le complexe textile 10,11 comporte également des couches supérieures 12,13,14,15 5 en un nombre variable en fonction de l'application. Ces renforts 12-15 peuvent être en particulier des mats à base de fibres de verre ou des tissus, ou bien encore des nappes unidirectionnelles, ou multidirectionnelles voire bidirectionnelles, ou bien encore de non tissés ou autre nappe fibreuses en fonction des propriétés mécaniques et de l'aspect de surface recherchés. 10 Le complexe textile 10,11 déborde avantageusement de l'âme centrale afin de pouvoir recouvrir les panneaux adjacents et faciliter le transfert des efforts. The textile complex 10, 11 also comprises upper layers 12, 13, 14, 15 in a variable number depending on the application. These reinforcements 12 - 15 may in particular be mats based on glass fibers or fabrics, or alternatively unidirectional, or multidirectional or even bi-directional, or else non-woven or other fibrous webs depending on the mechanical properties and the desired surface appearance. The textile complex 10, 11 advantageously overflows from the central core in order to cover the adjacent panels and facilitate the transfer of forces.

Un tel produit présente de multiples avantages dans la mesure où il permet un 15 assemblage final comme un kit, directement dans le moule en fonction de la géométrie des pièces à réaliser. Un tel produit est particulièrement adapté pour les procédés d'infusion sur des pièces de grande largeur. On peut citer à titre d'exemple les nacelles d'éoliennes, les planchers de véhicules, les ponts de bateaux, les panneaux muraux et les bassins de piscines en particulier. Such a product has many advantages in that it allows a final assembly as a kit, directly in the mold according to the geometry of the parts to be produced. Such a product is particularly suitable for infusion processes on large parts. Examples include wind turbine nacelles, vehicle floors, boat decks, wall panels and pool ponds in particular.

Claims (1)

REVENDICATIONS1/ Article (1) destiné à la réalisation de pièces sandwich composites par des procédés d'infusion, comportant une âme centrale (2) incluant un panneau en structure (4) de nid d'abeille, caractérisé en ce qu'il comporte sur chacune des faces de l'âme, un complexe textile (10,11) incluant une couche drainante (6) et un ensemble d'au moins une couche textile de renfort (12-15). 2/ Article selon la revendication 1, caractérisé en ce que l'âme (2) comporte un film étanche (3) en matière polymérique recouvrant au moins une des faces de la structure (4) en nid d'abeille. 3/ Article selon la revendication 2, caractérisé en ce que le film (3) est soudé à la 15 structure (4) en nid d'abeille. 4/ Article selon la revendication 1, caractérisé en ce que l'âme (2) comporte sur au moins une de ses faces une couche (5) en un matériau non tissé, au contact duquel vient le complexe textile (10,11). 5/ Article selon la revendication 1, caractérisé en ce que le complexe textile et/ou l'âme sont recouverts d'une couche (7) d'adhésif repositionnable. 6/ Article selon l'une quelconque des revendications précédentes, caractérisé en ce 25 que le complexe textile (10,11) déborde de l'âme centrale. 7/ Article selon l'une quelconque des revendications précédentes, caractérisé en ce que l'ensemble des couches textiles de renfort (12-15) comprend des éléments choisis dans le groupe comprenant les mats de fibres, les tissus, les nappes unies ou 30 pluridirectionnelles et les non tissés. 20 CLAIMS1 / Article (1) intended for producing composite sandwich pieces by infusion processes, comprising a central core (2) including a honeycomb structure panel (4), characterized in that it comprises on each of the faces of the core, a textile complex (10,11) including a draining layer (6) and a set of at least one reinforcing textile layer (12-15). 2 / Article according to claim 1, characterized in that the core (2) comprises a sealing film (3) of polymeric material covering at least one of the faces of the structure (4) honeycomb. 3 / Article according to claim 2, characterized in that the film (3) is welded to the structure (4) honeycomb. 4 / Article according to claim 1, characterized in that the core (2) has on at least one of its faces a layer (5) of a nonwoven material, in contact with which comes the textile complex (10,11). 5 / Article according to claim 1, characterized in that the textile complex and / or the core are covered with a layer (7) of repositionable adhesive. 6 / Article according to any one of the preceding claims, characterized in that the textile complex (10,11) protrudes from the central core. 7 / Article according to any one of the preceding claims, characterized in that the set of reinforcing textile layers (12-15) comprises elements selected from the group consisting of fiber mats, fabrics, plain webs or 30 multi-directional and non-woven. 20
FR0854873A 2008-07-17 2008-07-17 ARTICLE FOR PRODUCING COMPOSITE SANDWICH PIECES BY RESIN INFUSION PROCESSES Expired - Lifetime FR2933899B3 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR0854873A FR2933899B3 (en) 2008-07-17 2008-07-17 ARTICLE FOR PRODUCING COMPOSITE SANDWICH PIECES BY RESIN INFUSION PROCESSES
ES200801863U ES1068720Y (en) 2008-07-17 2008-09-15 ARTICLE FOR THE REALIZATION OF COMPOSITE SANDWICH PARTS THROUGH RESIN INFUSION PROCEDURES
DE202008012572U DE202008012572U1 (en) 2008-07-17 2008-09-22 Article for the production of sandwich composite components by resin infusion process

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Application Number Priority Date Filing Date Title
FR0854873A FR2933899B3 (en) 2008-07-17 2008-07-17 ARTICLE FOR PRODUCING COMPOSITE SANDWICH PIECES BY RESIN INFUSION PROCESSES

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FR2933899A1 true FR2933899A1 (en) 2010-01-22
FR2933899B3 FR2933899B3 (en) 2012-02-24

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2433779B1 (en) * 2010-09-23 2015-08-12 AIRBUS HELICOPTERS DEUTSCHLAND GmbH Composite element made from a preform and a multi-layer thermoplastic foil
CN102107362B (en) * 2010-12-11 2012-11-07 东方电气集团东方汽轮机有限公司 Cellular band processing device
US10220593B2 (en) 2013-07-26 2019-03-05 Learjet Inc. Composite material incorporating water ingress barrier
DE102014017200A1 (en) 2014-11-21 2016-05-25 Airbus Defence and Space GmbH Process for the production of fiber composite parts and a fiber composite part
DE102014017201A1 (en) 2014-11-21 2016-05-25 Airbus Defence and Space GmbH Process for the production of fiber composite parts and a fiber composite part
DE102015005492B4 (en) 2015-04-30 2023-05-04 Airbus Defence and Space GmbH Flow aid for an infusion structure and infusion structure and method for infiltrating a fibrous material
DE102015111537A1 (en) * 2015-07-16 2017-01-19 Fvv Gmbh & Co. Kg Component made of a composite material and method for its production

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ES1068720U (en) 2008-11-16
FR2933899B3 (en) 2012-02-24
ES1068720Y (en) 2009-02-16
DE202008012572U1 (en) 2008-12-24

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