EP0880327B2 - Heat-activatable reinforcing element for footwear, and footwear comprising same - Google Patents
Heat-activatable reinforcing element for footwear, and footwear comprising same Download PDFInfo
- Publication number
- EP0880327B2 EP0880327B2 EP97905205A EP97905205A EP0880327B2 EP 0880327 B2 EP0880327 B2 EP 0880327B2 EP 97905205 A EP97905205 A EP 97905205A EP 97905205 A EP97905205 A EP 97905205A EP 0880327 B2 EP0880327 B2 EP 0880327B2
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- EP
- European Patent Office
- Prior art keywords
- footwear
- reinforcing
- fabric
- heat
- article
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 230000003014 reinforcing effect Effects 0.000 title claims description 37
- 239000004744 fabric Substances 0.000 claims description 35
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 229920003235 aromatic polyamide Polymers 0.000 claims description 3
- 229920005648 ethylene methacrylic acid copolymer Polymers 0.000 claims description 3
- 230000000536 complexating effect Effects 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 claims description 2
- 241000531908 Aramides Species 0.000 claims 2
- 230000002787 reinforcement Effects 0.000 description 26
- 239000010410 layer Substances 0.000 description 16
- 239000000835 fiber Substances 0.000 description 10
- 239000002131 composite material Substances 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229920002994 synthetic fiber Polymers 0.000 description 6
- 229920006231 aramid fiber Polymers 0.000 description 5
- 239000004760 aramid Substances 0.000 description 4
- 229920005992 thermoplastic resin Polymers 0.000 description 4
- 238000009966 trimming Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 210000002683 foot Anatomy 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 229920003182 Surlyn® Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 210000003423 ankle Anatomy 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000012781 shape memory material Substances 0.000 description 1
- 229920000431 shape-memory polymer Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Images
Classifications
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B23/00—Uppers; Boot legs; Stiffeners; Other single parts of footwear
- A43B23/08—Heel stiffeners; Toe stiffeners
- A43B23/16—Heel stiffeners; Toe stiffeners made of impregnated fabrics, plastics or the like
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B1/00—Footwear characterised by the material
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B23/00—Uppers; Boot legs; Stiffeners; Other single parts of footwear
- A43B23/08—Heel stiffeners; Toe stiffeners
- A43B23/081—Toe stiffeners
- A43B23/086—Toe stiffeners made of impregnated fabrics, plastics or the like
Definitions
- the invention relates to a reinforcing element thermoactivable, in the form of a complex, and used in the manufacture of footwear.
- FR-A-2 065 960 describes a composite material made up of strips of fabrics impregnated with a dispersion synthetic elements of styrene-butadiene polymer carboxyl. The faces of the layer as well carried out are then, for one, coated with a dispersion synthetic materials suitable for said face the appearance of suede while being resistant to abrasion and, for the other, coated for example by a sticky coating allowing hot gluing in a shoe.
- thermoplastic resin is preferably an ethylene-methacrylic acid copolymer thermoactivable at a temperature below 100 ° C.
- US patent US-A-5,354,604 relates to also a composite material serving as reinforcement, consisting of a core of thermo-deformable thermoplastic resin, layers of woven being placed on the side and other of said soul and linked to them by layers resins.
- the woven layers have a sufficient thickness to impart rigidity and sufficient strength to the composite structure.
- a subject reinforced with a fibrous element included within of a thickness of synthetic material is subject to a first coating direct by the synthetic material, the fibrous element is then affixed to the plaster and pressed so that the molten coating enters the macroscopic openings defined between the fibers, a second coating is then applied in the molten state in order to fill the depressions on the surface of the reinforcing element, joining the first coating in the openings macroscopic of the fibrous element.
- the fibrous element is embedded by applying pressure within a single layer coating of synthetic material. In these two case, the process requires the submission of the article footwear at very high temperatures in order to apply the synthetic material melted in the form of a coating.
- the coating of the material to be reinforced by a synthetic material in molten form necessarily leads to high temperatures during the manufacturing cycle of the footwear which may cause damage to said material strengthen.
- the procedure for coating the material to be reinforced lengthens the manufacturing cycle time of said footwear.
- the method described envisages only the reinforcement directly on the material of the footwear during its manufacturing cycle, the material to be reinforced in front automatically be subject to temperature conditions severe previously mentioned.
- DE-A-41 20 134 describes a fiber support suitable for welding or bonding between two compounds that are not stickable or weldable one with the other, these compounds being able to constitute two elements to link with an article of footwear.
- the support fibrous has an outer layer on one side with which one of the compounds is identical or bondable or weldable and on the other side an outer layer with which the other compound is identical or bondable or weldable, either chemically or mechanically.
- the fiber support can optionally constitute plus a stiffening element between the two compounds.
- JP-A-3221001 a manufacturing process reinforced footwear using a body of reinforcement formed from a shape memory polymer and shaped previously in curved form along a form of shoe mold.
- the reinforcement body is then heated and deformed into a plane form at a temperature below the molding temperature and is then introduced into a pocket then attached to the conservation of shape of the shoe upper.
- the invention relates to a reinforcing element thermoactivable, intended to be set up in a footwear, said element being in the form of complex and made up of at least three layered elements, said elements being: a thermoactivable element at shape memory which is an ethylene-acid copolymer methacrylic, a stiffening element thermoactivable, and a reinforcement fabric of aramid fibers inserted between the first two elements, said element of stiffening permeating said reinforcing fabric and having a softening point lower than the fusion of the fibers of said reinforcing fabric, said element of stiffening and said shape memory element being thermoactivable at a temperature below 100 ° C, i.e. within the range of temperatures used at during a manufacturing cycle of an article of footwear.
- the reinforcing element therefore consists of three elements in separate layers, each of which has specific characteristics giving the element of reinforcement of specific properties.
- the reinforcing element according to the invention can be define in two parts of distinct functions, one constituting a hard end or buttress and the other a reinforcement of said hard end or buttress, the first part being constituted by the shape memory element whose dimensions and characteristics are similar to those a standard type butt or buttress and the second part consisting of the reinforcing fabric and the stiffening element whose characteristics constitute a local reinforcement for the memory element of form.
- the shape memory element provides the footwear an ability to recover its original shape even after undergone deformation, for example by impact. He contributes therefore maintaining the aesthetic integrity of said article fit.
- a thermoactivable material is used at temperatures compatible with the manufacturing cycle of the footwear, having a shape memory, to know an ethylene-methacrylic acid copolymer sold under the registered trademark SURLYN or of the type sold under the IMPERFIRM trademark.
- the stiffening element is a heat-activated resin and heat-sealed chosen so as to stiffen locally at room temperature the tissue area of reinforcement that it permeates by a local increase thick while having a softening point low, preferably below 100 ° C, to allow forming at temperatures compatible with manufacturing cycle temperatures of an item fit.
- the layer of the stiffening element can be made by direct coating of the reinforcing fabric by said resin.
- the reinforcement fabric of aramid fibers allows to limit the creep of the other two elements laminated during a brief request or permanent such as crushing or slipping of the foot in the footwear, insofar as the fibers of the tensile fabrics also have a low elongation capacity.
- the aramid fiber fabric has a basis weight of 60 g / m 2 .
- This aramid fiber fabric provides reinforcement optimal in terms of resistance to wear, tearing and also limits the risk of foot irritation the user.
- the reinforcing element thus produced is mounted on the face internal of a rod to locally reinforce an article footwear in the same way as a usual reinforcement heat-activated.
- the shape memory element which plays the role of a standard hard butt or buttress is preferably attached to the upper of the footwear so that the reinforcement fabric and the stiffening element are placed inside said footwear.
- the reinforcing element thus produced makes it possible to reinforce footwear without require significant modification in the cycle of usual manufacturing, forming temperatures, in in particular the deformation of the stiffening element and of the shape memory element, being less than 100 ° C. There is therefore no longer any risk of degradation of other components of the footwear.
- the reinforcing element is obtained by superimposition flat of the three separate layers.
- the shape memory element 1 has, from preferably, a cut and a dimension specific to constitute either a buttress or a hard end of the type standard, its thickness being between 0.5 and 1.5 mm. It is coated on its external face with a hot-melt adhesive allowing its subsequent bonding on the rod 4 an article of footwear. Its shape memory allows it return to its original shape after deformation by a shock or accidental stress.
- Reinforcement fabric of light weight 2 is preferably a fabric of aramid fibers impregnated by the stiffening element 3.
- Said stiffening element 3 is preferably consisting of poly "caprolactone" and present a softening point between 55 and 70 ° C. he covers the reinforcement fabric 2 so that it has a local increase in thickness between 0.2 and 0.8 mm.
- Reinforcement fabric 2 and element layer of stiffening 3 have the same dimensions and the fabric 2 is positioned so that the component fibers the fabric are preferably oriented at +/- 45 ° with respect to the longitudinal axis of the footwear. This position of the fibers is held in place in the reinforcing element by impregnating the reinforcing fabric 2 by the stiffening element 3.
- the reinforcing element has a structure such that the reinforcement fabric 2 is located between the element to shape memory 1 and the stiffening element 3.
- the dimensions of the element layer stiffening 3 and reinforcing fabric 2 are such that, from preferably, their surface is between 90 and 40% of the surface of the shape memory element 1.
- the element with shape memory 1 presents a trimming at the end not to mark the shoe after mounting on the upper 4 and in a sole 5.
- the dimensions of the reinforcing fabric 2 and the layer of the stiffening element 3 are also such that these do not cover the trimming area 1 'of the shape memory element 1.
- the stiffening element 3 also presents a trimming 3 'so to obtain a variation in thickness and stiffness progressive so as not to harm user comfort and also to preserve the aesthetics of the article footwear (no marking).
- Layers 1, 2 and 3 can be mounted by the so-called complexing process corresponding to the superposition of the different layers during the fitting of the footwear.
- the impregnation fabric 2 by the stiffening element 3 intervenes during the softening of the element of stiffening during forming.
- the fabric 2 is then previously impregnated by direct coating with the stiffening element 3, then laminated to the memory element of form 1.
- the reinforcing element is mounted on the rod 4 of the same way as a hard tip or a heat-activated buttress usual.
- the rod 4 of footwear constitutes the outer shell of the reinforcing element while the fabric 2 impregnated with the stiffening element 3 performs the role of inner skin in the fitted footwear.
- the reinforcing element can however be covered internally a protective fabric or film and cleanliness 6.
- the variation of the thickness of the element reinforcement preserves user comfort and aesthetics of the footwear.
- this reinforcing element can be used to reinforce any part of the rod, the dimensions and the shape of said element then being chosen in depending on the area of the rod to be reinforced.
Landscapes
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Description
L'invention concerne un élément de renfort thermoactivable, sous forme de complexe, et utilisé dans la fabrication d'articles chaussants.The invention relates to a reinforcing element thermoactivable, in the form of a complex, and used in the manufacture of footwear.
Il est connu de consolider des articles chaussants au cours de leur fabrication en prévoyant la mise en place de contreforts au niveau du talon et de la cheville ainsi que de bouts durs à l'avant desdits articles.It is known to consolidate footwear during their manufacture by providing for the placing in place of buttresses at the heel and ankle as well as hard ends at the front of said articles.
FR-A-2 065 960 décrit un matériau composite constitué de bandes de tissus imprégnés par une dispersion d'éléments synthétiques de polymère de styrène-butadiène carboxylé. Les faces de la couche ainsi réalisée sont ensuite, pour l'une, enduite d'une dispersion de matières synthétiques propres à conférer à ladite face l'aspect du daim tout en étant résistant à l'abrasion et, pour l'autre, enduite par exemple par un enduit collant permettant son collage à chaud dans une chaussure.FR-A-2 065 960 describes a composite material made up of strips of fabrics impregnated with a dispersion synthetic elements of styrene-butadiene polymer carboxyl. The faces of the layer as well carried out are then, for one, coated with a dispersion synthetic materials suitable for said face the appearance of suede while being resistant to abrasion and, for the other, coated for example by a sticky coating allowing hot gluing in a shoe.
On connaít également par EP-A-0 102 414 une structure laminée comportant une âme en résine thermoplastique, des couches de tissus étant placées de part et d'autre de ladite âme en résine thermoplastique, les fibres du tissu piégées en partie dans ladite résine étant également imprégnées par un adhésif activable par solvant ou par chauffage permettant le collage de cette structure laminée en tant que renfort sur un substrat. Les couches de tissu imprégné d'adhésif permettent également de rigidifier la structure. La résine thermoplastique est de préférence un copolymère éthylène-acide méthacrylique thermoactivable à une température inférieure à 100°C.We also know from EP-A-0 102 414 a laminated structure comprising a thermoplastic resin core, layers of tissue being placed on either side of said thermoplastic resin core, the fibers of the fabric partially trapped in said resin also being impregnated with an activatable adhesive by solvent or by heating allowing the bonding of this laminated structure as reinforcement on a substrate. The layers of fabric impregnated with adhesive also allow stiffen the structure. The thermoplastic resin is preferably an ethylene-methacrylic acid copolymer thermoactivable at a temperature below 100 ° C.
Le brevet américain US-A-5 354 604 concerne également un matériau composite servant de renfort, constitué d'une âme en résine thermoplastique thermo-déformable, des couches de tissé étant placées de part et d'autre de ladite âme et liées à celles-ci par des couches de résines. Les couches de tissé présentent une épaisseur suffisante pour conférer une rigidité et une force suffisantes à la structure composite. On utilise, de préférence, des tissés de fibres de carbone, de verre ou d'aramide. Ce matériau composite peut ensuite être mis en forme par chauffage dans un moule.US patent US-A-5,354,604 relates to also a composite material serving as reinforcement, consisting of a core of thermo-deformable thermoplastic resin, layers of woven being placed on the side and other of said soul and linked to them by layers resins. The woven layers have a sufficient thickness to impart rigidity and sufficient strength to the composite structure. We use, preferably woven carbon fiber, glass or aramid. This composite material can then be put shaped by heating in a mold.
Si ces structures composites décrites présentent de bonnes caractéristiques quant à leur oeuvrabilité et leurs propriétés de protection, il s'avère que ces produits sont la plupart du temps inadaptés pour être utilisés au cours de la fabrication courante d'articles chaussants. En effet, soit il est nécessaire de chauffer les structures composites à de hautes températures pour pouvoir les mettre en forme, soit il est nécessaire de faire subir à l'article chaussant une cuisson ultérieure. Dans ces deux cas, il existe un risque de dégradation des autres composants de l'article chaussant ainsi qu'un allongement non négligeable des temps de cycle de fabrication.If these composite structures described have good characteristics regarding their workability and their protective properties, it turns out that these products are mostly unsuitable to be used during routine manufacture of articles footwear. Indeed, either it is necessary to heat composite structures at high temperatures to be able to format them, either it is necessary to subject the footwear to subsequent cooking. In these two cases, there is a risk of degradation other components of the footwear as well as a significant lengthening of the manufacturing cycle.
On connait également par le brevet FR-A-2.108.913 et son addition FR-A-2.106.526, une matière renforcée à l'aide d'un élément fibreux compris au sein d'une épaisseur de matière synthétique. Dans une première forme de réalisation, une zone d'un composant d'article chaussant est soumis à une première enduction directe par la matière synthétique, l'élément fibreux est ensuite apposé sur l'enduit et pressé afin que l'enduit fondu pénètre dans les ouvertures macroscopiques définies entre les fibres, un second enduit est alors appliqué à l'état fondu afin de remplir les dépressions à la surface de l'élément de renforcement, rejoignant le premier enduit dans les ouvertures macroscopiques de l'élément fibreux. Selon une seconde forme de réalisation, l'élément fibreux est noyé par application d'une pression au sein d'une seule couche d'enduction de matière synthétique. Dans ces deux cas, le procédé nécessite la soumission de l'article chaussant à des températures très élevées afin d'appliquer la matière synthétique fondue sous forme d'enduit.We also know by patent FR-A-2,108,913 and its addition FR-A-2.106.526, a subject reinforced with a fibrous element included within of a thickness of synthetic material. In a first embodiment, an area of a component footwear is subject to a first coating direct by the synthetic material, the fibrous element is then affixed to the plaster and pressed so that the molten coating enters the macroscopic openings defined between the fibers, a second coating is then applied in the molten state in order to fill the depressions on the surface of the reinforcing element, joining the first coating in the openings macroscopic of the fibrous element. According to one second embodiment, the fibrous element is embedded by applying pressure within a single layer coating of synthetic material. In these two case, the process requires the submission of the article footwear at very high temperatures in order to apply the synthetic material melted in the form of a coating.
Là encore, l'enduction de la matière à renforcer par une matière synthétique sous forme fondue entraíne nécessairement des températures élevées au cours du cycle de fabrication de l'article chaussant pouvant entraíner des endommagements de ladite matière à renforcer. En outre, la procédure d'enduction de la matière à renforcer allonge le temps du cycle de fabrication dudit article chaussant. De plus, le procédé décrit envisage uniquement la réalisation d'un renfort directement sur la matière de l'article chaussant au cours de son cycle de fabrication, la matière à renforcer devant automatiquement être soumise aux conditions de température sévères évoquées auparavant.Again, the coating of the material to be reinforced by a synthetic material in molten form necessarily leads to high temperatures during the manufacturing cycle of the footwear which may cause damage to said material strengthen. In addition, the procedure for coating the material to be reinforced lengthens the manufacturing cycle time of said footwear. In addition, the method described envisages only the reinforcement directly on the material of the footwear during its manufacturing cycle, the material to be reinforced in front automatically be subject to temperature conditions severe previously mentioned.
DE-A-41 20 134 décrit un support de fibres propre à permettre un soudage ou collage entre deux composés qui ne sont pas collables ou soudables l'un avec l'autre, ces composés pouvant constituer deux éléments à lier d'un article chaussant. A cet effet, le support fibreux comporte d'un côté une couche extérieure avec laquelle l'un des composés est identique ou collable ou soudable et de l'autre côté une couche extérieure avec laquelle l'autre composé est identique ou collable ou soudable et ce, de manière chimique ou mécanique. Le support de fibres peut éventuellement constituer en plus un élément de rigidification entre les deux composés. Cependant, ceci s'applique en particulier à des composés tels que, dans la plage de température de fusion de l'un, l'autre reste stable. Une telle structure ne peut donc être utilisée pour obtenir un renfort d'article chaussant thermoformable.DE-A-41 20 134 describes a fiber support suitable for welding or bonding between two compounds that are not stickable or weldable one with the other, these compounds being able to constitute two elements to link with an article of footwear. For this purpose, the support fibrous has an outer layer on one side with which one of the compounds is identical or bondable or weldable and on the other side an outer layer with which the other compound is identical or bondable or weldable, either chemically or mechanically. The fiber support can optionally constitute plus a stiffening element between the two compounds. However, this applies in particular to compounds such as, in the one's melting temperature range, the other remains stable. Such a structure cannot therefore be used for obtain a thermoformable footwear reinforcement.
On connaít par JP-A-3221001 un procédé de fabrication d'articles chaussants renforcés utilisant un corps de renfort formé d'un polymère à mémoire de forme et conformé préalablement sous forme courbe le long d'une forme de moule de chaussure. Le corps de renfort est ensuite chauffé et déformé sous une forme plane à une température inférieure à la température de moulage et est ensuite introduit dans une pochette fixée ensuite sur la zone de conservation de forme de la tige de la chaussure. On chauffe ensuite à une température permettant au corps de renfort de recouvrer sa forme courbe d'origine entraínant ainsi la mise en forme de la tige de la chaussure.We know from JP-A-3221001 a manufacturing process reinforced footwear using a body of reinforcement formed from a shape memory polymer and shaped previously in curved form along a form of shoe mold. The reinforcement body is then heated and deformed into a plane form at a temperature below the molding temperature and is then introduced into a pocket then attached to the conservation of shape of the shoe upper. We then heats to a temperature allowing the body to reinforcement to recover its original curved shape thus shaping the upper of the shoe.
Un tel procédé reste cependant insatisfaisant dans la mesure où il n'est applicable qu'à un corps de renfort constitué uniquement d'un matériau à mémoire de forme et ne peut s'appliquer à des structures composites dont l'un des éléments ne serait pas à mémoire de forme, ce qui limite les propriétés du corps de renfort.However, such a method remains unsatisfactory in the since it is only applicable to a reinforcement body made only of shape memory material and does not can be applied to composite structures, one of the elements would not be shape memory, which limits the properties of the reinforcing body.
Il convient donc de remédier à cet inconvénient en proposant un renfort utilisable lors de la fabrication d'un article chaussant renforcé, par exemple dans les zones avant et arrière, sans qu'il soit nécessaire d'imposer des modifications importantes aux techniques actuelles de fabrication, en particulier en ce qui concerne la température et le temps du cycle de fabrication tout en offrant de bonnes, voire meilleures, propriétés de renforcement.This disadvantage should therefore be remedied by offering a reinforcement that can be used during the manufacture of a reinforced footwear, for example in areas front and rear, without the need to impose significant changes to current techniques of manufacturing, particularly with regard to the temperature and time of the manufacturing cycle while offering good, if not better, properties of enhancement.
A cet effet, l'invention a pour objet un élément de renfort thermoactivable, destiné à être mis en place dans un article chaussant, ledit élément étant sous forme de complexe et constitué d'au moins trois éléments en couches, lesdits éléments étant : un élément thermoactivable à mémoire de forme qui est un copolymère éthylène - acide méthacrylique, un élément de rigidification thermoactivable, et un tissu de renfort en fibres d'aramide inséré entre les deux premiers éléments, ledit élément de rigidification imprégnant ledit tissu de renfort et présentant un point de ramollissement inférieur au point de fusion des fibres dudit tissu de renfort, ledit élément de rigidification et ledit élément à mémoire de forme étant thermoactivables à une température inférieure à 100°C, c'est-à-dire dans la plage des températures utilisées au cours d'un cycle de fabrication d'un article chaussant.To this end, the invention relates to a reinforcing element thermoactivable, intended to be set up in a footwear, said element being in the form of complex and made up of at least three layered elements, said elements being: a thermoactivable element at shape memory which is an ethylene-acid copolymer methacrylic, a stiffening element thermoactivable, and a reinforcement fabric of aramid fibers inserted between the first two elements, said element of stiffening permeating said reinforcing fabric and having a softening point lower than the fusion of the fibers of said reinforcing fabric, said element of stiffening and said shape memory element being thermoactivable at a temperature below 100 ° C, i.e. within the range of temperatures used at during a manufacturing cycle of an article of footwear.
L'élément de renfort est donc constitué de trois éléments en couches distinctes, chacun de ces éléments présentant des caractéristiques propres conférant à l'élément de renfort des propriétés particulières.The reinforcing element therefore consists of three elements in separate layers, each of which has specific characteristics giving the element of reinforcement of specific properties.
Ainsi, l'élément de renfort selon l'invention peut se définir en deux parties de fonctions distinctes, l'une constituant un bout dur ou contrefort et l'autre un renfort dudit bout dur ou contrefort, la première partie étant constituée par l'élément à mémoire de forme dont les dimensions et les caractéristiques sont similaires à celles d'un embout ou contrefort de type standard et la seconde partie étant constituée par le tissu de renfort et l'élément de rigidification dont les caractéristiques constituent un renfort local pour l'élément à mémoire de forme.Thus, the reinforcing element according to the invention can be define in two parts of distinct functions, one constituting a hard end or buttress and the other a reinforcement of said hard end or buttress, the first part being constituted by the shape memory element whose dimensions and characteristics are similar to those a standard type butt or buttress and the second part consisting of the reinforcing fabric and the stiffening element whose characteristics constitute a local reinforcement for the memory element of form.
L'élément à mémoire de forme procure à l'article chaussant une capacité à recouvrer sa forme initiale même après avoir subi une déformation, par exemple par choc. Il contribue donc au maintien de l'intégrité esthétique dudit article chaussant. On utilise un matériau thermoactivable à des températures compatibles avec le cycle de fabrication de l'article chaussant, présentant une mémoire de forme, à savoir un copolymère éthylène-acide méthacrylique vendu sous la marque déposée SURLYN ou encore du type vendu sous la marque déposée IMPERFIRM.The shape memory element provides the footwear an ability to recover its original shape even after undergone deformation, for example by impact. He contributes therefore maintaining the aesthetic integrity of said article fit. A thermoactivable material is used at temperatures compatible with the manufacturing cycle of the footwear, having a shape memory, to know an ethylene-methacrylic acid copolymer sold under the registered trademark SURLYN or of the type sold under the IMPERFIRM trademark.
L'élément de rigidification est une résine thermoactivable et thermocollable choisie de manière à rigidifier localement à température ambiante la zone du tissu de renfort qu'elle imprègne par une augmentation locale d'épaisseur tout en présentant un point de ramollissement bas, de préférence inférieur à 100°C, pour permettre un formage à des températures compatibles avec les températures du cycle de fabrication d'un article chaussant. La couche de l'élément de rigidification peut être réalisée par enduction directe du tissu de renfort par ladite résine.The stiffening element is a heat-activated resin and heat-sealed chosen so as to stiffen locally at room temperature the tissue area of reinforcement that it permeates by a local increase thick while having a softening point low, preferably below 100 ° C, to allow forming at temperatures compatible with manufacturing cycle temperatures of an item fit. The layer of the stiffening element can be made by direct coating of the reinforcing fabric by said resin.
Avantageusement, le tissu de renfort en fibres d'aramide permet, quant à lui, de limiter le fluage des deux autres éléments contrecollés lors d'une sollicitation brève ou permanente telle qu'un écrasement ou un glissement du pied dans l'article chaussant, dans la mesure où les fibres du tissu sollicitées en traction présentent en outre une faible capacité d'allongement.Advantageously, the reinforcement fabric of aramid fibers allows to limit the creep of the other two elements laminated during a brief request or permanent such as crushing or slipping of the foot in the footwear, insofar as the fibers of the tensile fabrics also have a low elongation capacity.
De préférence, le tissu de fibres d'aramide a un grammage de 60 g/m2.Preferably, the aramid fiber fabric has a basis weight of 60 g / m 2 .
Ce tissu de fibres d'aramide permet d'obtenir un renfort optimal quant à la résistance à l'usure, au déchirement et limite en outre les risques d'irritation des pieds de l'utilisateur.This aramid fiber fabric provides reinforcement optimal in terms of resistance to wear, tearing and also limits the risk of foot irritation the user.
L'élément de renfort ainsi réalisé est monté sur la face interne d'une tige pour renforcer localement un article chaussant de la même façon qu'un renfort habituel thermoactivable. L'élément à mémoire de forme, qui joue le rôle d'un bout dur ou contrefort standard est de préférence accolé à la tige de l'article chaussant de sorte que le tissu de renfort et l'élément de rigidification sont placés à l'intérieur dudit article chaussant.The reinforcing element thus produced is mounted on the face internal of a rod to locally reinforce an article footwear in the same way as a usual reinforcement heat-activated. The shape memory element, which plays the role of a standard hard butt or buttress is preferably attached to the upper of the footwear so that the reinforcement fabric and the stiffening element are placed inside said footwear.
L'élément de renfort ainsi réalisé permet de réaliser un renforcement d'article chaussant sans nécessiter de modification importante dans le cycle de fabrication habituel, les températures de formage, en particulier la déformation de l'élément de rigidification et de l'élément à mémoire de forme, étant inférieures à 100°C. Il n'y donc plus de risques de dégradation des autres constituants de l'article chaussant.The reinforcing element thus produced makes it possible to reinforce footwear without require significant modification in the cycle of usual manufacturing, forming temperatures, in in particular the deformation of the stiffening element and of the shape memory element, being less than 100 ° C. There is therefore no longer any risk of degradation of other components of the footwear.
On décrira maintenant l'invention plus en détail
en référence au dessin dans lequel :
L'élément de renfort est obtenu par la superposition à plat des trois couches distinctes.The reinforcing element is obtained by superimposition flat of the three separate layers.
L'élément à mémoire de forme 1 présente, de
préférence, une découpe et une dimension propre à
constituer soit un contrefort soit un bout dur de type
standard, son épaisseur étant comprise entre 0,5 et 1,5
mm. Il est enduit sur sa face externe par une colle thermofusible
permettant son collage ultérieur sur la tige 4
d'un article chaussant. Sa mémoire de forme lui permet
de reprendre sa forme initiale après déformation par un
choc ou une contrainte accidentelle. Le tissu de renfort
de faible grammage 2 est, de préférence, un tissu de
fibres d'aramide imprégné par l'élément de rigidification
3.The
Ledit élément de rigidification 3 est de préférence
constitué par du poly" caprolactone " et présente
un point de ramollissement compris entre 55 et 70°C. Il
recouvre le tissu de renfort 2 de telle sorte qu'il présente
une augmentation locale d'épaisseur comprise entre
0,2 et 0,8 mm.Said
Le tissu de renfort 2 et la couche d'élément de
rigidification 3 présentent les mêmes dimensions et le
tissu 2 est positionné de telle sorte que les fibres composant
le tissu sont de préférence orientées à +/- 45°
par rapport à l'axe longitudinal de l'article chaussant.
Cette position des fibres est maintenue en place dans
l'élément de renfort par l'imprégnation du tissu de renfort
2 par l'élément de rigidification 3.
Ce positionnement des fibres confère à l'élément de renfort une aisance de formage dans la mesure où on évite ainsi la formation de plis. Toutefois une autre orientation des fibres composant le tissu de renfort (de 0 à 90° par rapport à l'axe longitudinal de l'article chaussant) pourrait être retenue sans faire novation.This positioning of the fibers gives the element to reinforce an ease of forming in the measurement where it avoids the formation of folds. However another orientation of the fibers making up the reinforcement fabric (from 0 to 90 ° relative to the longitudinal axis of the footwear) could be retained without making novation.
L'élément de renfort présente une structure
telle que le tissu de renfort 2 est situé entre l'élément à
mémoire de forme 1 et l'élément de rigidification 3.The reinforcing element has a structure
such that the
Les dimensions de la couche de l'élément de
rigidification 3 et du tissu de renfort 2 sont telles que, de
préférence, leur surface est comprise entre 90 et 40 %
de la surface de l'élément à mémoire de forme 1.The dimensions of the element layer
stiffening 3 and reinforcing
Ainsi qu'on peut le voir aux figures 1 et 2, l'élément
à mémoire de forme 1 présente un parage 1'afin
de ne pas marquer la chaussure après montage sur la
tige 4 et dans une semelle 5.As can be seen in Figures 1 and 2, the element
with
Les dimensions du tissu de renfort 2 et de la
couche de l'élément de rigidification 3 sont également
telles que ceux-ci ne recouvrent pas la zone de parage
1' de l'élément à mémoire de forme 1. L'élément de rigidification
3 présente également un parage 3' afin
d'obtenir une variation de l'épaisseur et de la rigidité
progressive pour ne pas nuire au confort de l'utilisateur
et pour préserver également l'esthétique de l'article
chaussant (absence de marquage).The dimensions of the reinforcing
Les couches 1, 2 et 3 peuvent être montées
par le procédé dit de complexage correspondant à la
superposition des différentes couches au cours du
montage de l'article chaussant. Dans ce cas, l'imprégnation
du tissu 2 par l'élément de rigidification 3 intervient
au cours du ramollissement de l'élément de
rigidification lors du formage.
On peut également préfabriquer l'ensemble de
l'élément de renfort. Le tissu 2 est alors préalablement
imprégné par enduction directe avec l'élément de rigidification
3, puis contrecollé sur l'élément à mémoire de
forme 1.We can also prefabricate all of
the reinforcing element. The
L'élément de renfort est monté sur la tige 4 de
la même façon qu'un bout dur ou un contrefort thermoactivable
usuel.The reinforcing element is mounted on the
Ainsi qu'on peut le voir à la figure 2, la tige 4
d'un article chaussant constitue l'enveloppe extérieure
de l'élément de renfort tandis que le tissu 2 imprégné de
l'élément de rigidification 3 assure le rôle de peau intérieure
dans l'article chaussant monté. Bien entendu,
l'élément de renfort peut cependant être recouvert intérieurement
d'un tissu ou d'un film de protection et de
propreté 6.As can be seen in Figure 2, the
Non seulement un tel élément de renfort permet un renforcement d'article chaussant au cours d'un cycle de fabrication normal sans qu'il soit nécessaire de procéder à des augmentations de températures trop importantes mais, en outre, il confère audit article chaussant une amélioration des caractéristiques de rigidité et de tenue aux chocs des zones renforcées dudit article chaussant lors d'écrasements ou de chocs d'énergie faible.Not only does such a reinforcing element allow reinforcement of footwear during a normal manufacturing cycle without the need to proceed with temperature increases too important but, moreover, it confers said article fitting improved stiffness characteristics and shock resistance of the reinforced areas of said footwear during crushing or impact of low energy.
Enfin, la variation de l'épaisseur de l'élément de renfort préserve le confort de l'utilisateur et l'esthétique de l'article chaussant.Finally, the variation of the thickness of the element reinforcement preserves user comfort and aesthetics of the footwear.
Bien entendu, cet élément de renfort peut être utilisé pour renforcer toute partie de la tige, les dimensions et la forme dudit élément étant alors choisies en fonction de la zone de la tige à renforcer.Of course, this reinforcing element can be used to reinforce any part of the rod, the dimensions and the shape of said element then being chosen in depending on the area of the rod to be reinforced.
Claims (8)
- Heat-activatable reinforcing element intended to be placed in an article of footwear, said element being in a complex form and made up of at least three elements in layers, said elements being:a heat-activatable shape-retaining element (1), which is an ethylene-methacrylic acid copolymer,a heat-activatable stiffening element (3), anda reinforcing fabric (2), formed from aramide fibres and inserted between the first two elements (1 and 3), said stiffening element (3) impregnating said reinforcing fabric (2) and having a softening point lower than the melting point of the fibres of said reinforcing fabric (2), said stiffening element (3) and said shape-retaining element (1) being heat-activatable at a temperature lower than 100° C, that is to say in the range of temperatures used in the course of a manufacturing cycle for an article of footwear.
- Reinforcing element according to claim 1, characterised in that the fabric of aramide fibres has a weighting of 60g/m2.
- Reinforcing element according to one of claims 1 to 2, characterised in that the stiffening element (3) is a heat-activatable and heat-adhesable resin, the softening point of which is lower than 100° C.
- Reinforcing element according to claim 3, characterised in that the stiffening element (3) is formed by poly "caprolactone" 6.
- Reinforcing element according to one of claims 1 to 4, characterised in that the layers (1), (2) and (3) are fitted by a method known as complexing.
- Reinforcing element according to one of claims 1 to 5, characterised in that it is prefabricated by prior counter-adhesion on the shape-retaining element (1) of the assembly formed by the fabric (2) impregnated by direct coating of the stiffening element (3).
- Article of footwear comprising a reinforcing element according to any one of claims 1 to 6.
- Article of footwear according to claim 7, characterised in that the reinforcing fabric (2) is positioned in the article of footwear so that the fibres making up said fabric (2) are orientated at +/- 45° relative to the longitudinal axis of the article of footwear.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9601882 | 1996-02-15 | ||
| FR9601882A FR2744889B1 (en) | 1996-02-15 | 1996-02-15 | HEAT-ACTIVABLE REINFORCEMENT MEMBER FOR FOOTWEAR AND FOOTWEAR COMPRISING SUCH A REINFORCEMENT MEMBER |
| PCT/FR1997/000282 WO1997029657A1 (en) | 1996-02-15 | 1997-02-14 | Heat-activatable reinforcing element for footwear, and footwear comprising same |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0880327A1 EP0880327A1 (en) | 1998-12-02 |
| EP0880327B1 EP0880327B1 (en) | 1999-11-10 |
| EP0880327B2 true EP0880327B2 (en) | 2002-08-14 |
Family
ID=9489234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97905205A Expired - Lifetime EP0880327B2 (en) | 1996-02-15 | 1997-02-14 | Heat-activatable reinforcing element for footwear, and footwear comprising same |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0880327B2 (en) |
| AU (1) | AU1883897A (en) |
| DE (1) | DE69700777T3 (en) |
| ES (1) | ES2138860T5 (en) |
| FR (1) | FR2744889B1 (en) |
| WO (1) | WO1997029657A1 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0183912A1 (en) † | 1984-12-03 | 1986-06-11 | Giulini Chemie GmbH | Stiffening material with hot melt adhesive properties |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA863308A (en) * | 1971-02-09 | Addison W. Closson, Jr. | Shoe lining and counter stiffener | |
| JPH064726B2 (en) * | 1984-11-13 | 1994-01-19 | 住友ゴム工業株式会社 | Rubber / plastic composite |
| JPH03221001A (en) * | 1990-01-27 | 1991-09-30 | Asahi Corp | Manufacture of shoe upper skin |
| DE4120134C2 (en) * | 1991-06-19 | 1996-05-30 | Uhl Sportartikel Karl | Shoe, in particular sports shoe |
-
1996
- 1996-02-15 FR FR9601882A patent/FR2744889B1/en not_active Expired - Fee Related
-
1997
- 1997-02-14 ES ES97905205T patent/ES2138860T5/en not_active Expired - Lifetime
- 1997-02-14 WO PCT/FR1997/000282 patent/WO1997029657A1/en active IP Right Grant
- 1997-02-14 DE DE69700777T patent/DE69700777T3/en not_active Expired - Fee Related
- 1997-02-14 AU AU18838/97A patent/AU1883897A/en not_active Abandoned
- 1997-02-14 EP EP97905205A patent/EP0880327B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0183912A1 (en) † | 1984-12-03 | 1986-06-11 | Giulini Chemie GmbH | Stiffening material with hot melt adhesive properties |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1883897A (en) | 1997-09-02 |
| DE69700777T2 (en) | 2000-06-08 |
| DE69700777D1 (en) | 1999-12-16 |
| WO1997029657A1 (en) | 1997-08-21 |
| ES2138860T3 (en) | 2000-01-16 |
| DE69700777T3 (en) | 2003-04-10 |
| EP0880327B1 (en) | 1999-11-10 |
| ES2138860T5 (en) | 2003-03-01 |
| EP0880327A1 (en) | 1998-12-02 |
| FR2744889B1 (en) | 1998-04-03 |
| FR2744889A1 (en) | 1997-08-22 |
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