EP0880327B1 - Heat-activatable reinforcing element for footwear, and footwear comprising same - Google Patents

Heat-activatable reinforcing element for footwear, and footwear comprising same Download PDF

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Publication number
EP0880327B1
EP0880327B1 EP97905205A EP97905205A EP0880327B1 EP 0880327 B1 EP0880327 B1 EP 0880327B1 EP 97905205 A EP97905205 A EP 97905205A EP 97905205 A EP97905205 A EP 97905205A EP 0880327 B1 EP0880327 B1 EP 0880327B1
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EP
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Prior art keywords
footwear
reinforcing
fabric
heat
article
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EP97905205A
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German (de)
French (fr)
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EP0880327B2 (en
EP0880327A1 (en
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Jacques Lesauce
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JALLATTE
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JALLATTE
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Classifications

    • 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 heat-activating reinforcing element, as a complex, and used in manufacturing footwear.
  • FR-A-2 065 960 describes a composite material consisting of strips of fabric impregnated with a dispersion of elements synthetics of carboxylated styrene-butadiene polymer.
  • the faces of the layer thus produced are then, for one, coated with a dispersion of synthetic materials suitable for imparting to said face the appearance of suede while being abrasion resistant and, for the other, coated with example by a sticky coating allowing its sticking to hot in a shoe.
  • American patent US-A-5 354 604 also relates to a composite material serving as reinforcement, consisting of a core in thermo-deformable thermoplastic resin, layers of woven being placed on either side of said core and linked to these by layers of resins. Layers of woven material have sufficient thickness to impart sufficient rigidity and strength to the structure composite. It is preferable to use woven fibers carbon, glass or aramid. This composite material can then be shaped by heating in a mold.
  • a material reinforced with of a fibrous element included within a thickness of synthetic material is subjected to a first direct coating by the material synthetic, the fibrous element is then affixed to the plaster and pressed so that the molten plaster 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 element of reinforcement, joining the first plaster in the macroscopic openings of the fibrous element.
  • the fibrous element is embedded by applying pressure within a single layer coating of synthetic material. In both cases, the process requires submission of the footwear to very high temperatures in order to apply the material synthetic melted as a coating.
  • the coating of the material to be reinforced by a synthetic material in molten form necessarily high temperatures during the cycle manufacturing footwear that may cause damage of said material to be reinforced.
  • the coating procedure of the material to be reinforced lengthens the time of the manufacturing cycle of said footwear.
  • the described method envisages only the realization a reinforcement directly on the material of the article footwear during its manufacturing cycle, the material to be reinforced, which should automatically be severe temperature conditions previously mentioned.
  • DE-A-41 20 134 describes a fiber support suitable for allow welding or bonding between two compounds which are not stickable or weldable with each other, these compounds which may constitute two elements to be linked footwear.
  • the fibrous support comprises on one side an outer layer with which one of compounds is identical or bondable or weldable and the other side an outer layer with which the other compound is identical or bondable or weldable, chemical or mechanical.
  • the fiber support can possibly also constitute an element of stiffening 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 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 footwear.
  • any material is used thermoactivable at temperatures compatible with the manufacturing cycle of the footwear, having a shape memory such as an ethylene-acid copolymer metacrylic sold under the registered trademark SURLYN or of the type sold under the trademark IMPERFIRM.
  • 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 footwear.
  • the layer of the stiffening element can be made by direct coating of the reinforcing fabric by said resin.
  • the reinforcing fabric allows, for its part, to limit the creep of the other two laminated elements during a brief or permanent request such as crushing or slipping of the foot in the article footwear, insofar as the fibers of the fabric tensile stresses also have a low elongation capacity.
  • the reinforcement fabric is a fabric of low grammage included in a range of 40 to 80 g / m 2 and whose tensile breaking stress is greater than 1000 Mpa and the tensile modulus is greater than 30000 Mpa .
  • the reinforcing fabric is preferably an aramid fiber fabric whose grammage is 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 thermoactivable.
  • 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 reinforcing fabric and stiffening element are placed inside said footwear.
  • the reinforcing element thus produced allows a reinforcement of footwear without requiring significant change in the manufacturing cycle usual, the forming temperatures, in particular the deformation of the stiffening element and of the element with shape memory, being less than 100 ° C. So there more risk of degradation of the other constituents of footwear.
  • the reinforcing element is obtained by layering flat of the three separate layers.
  • the shape memory element 1 preferably has a cutting and a dimension suitable to constitute either a buttress is a standard hard end, its thickness being between 0.5 and 1.5 mm. It is coated on its external face by a hot-melt adhesive allowing its subsequent bonding on the upper 4 of an article of footwear. Her shape memory allows it to return to its original shape after deformation by shock or stress accidental.
  • the light weight reinforcement fabric 2 is, from preferably an aramid fiber fabric impregnated with the stiffening element 3.
  • Said stiffening element 3 is preferably consisting of poly "caprolactone" and has a point softening between 55 and 70 ° C. It covers the reinforcement fabric 2 so that it has a local thickness increase 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 fibers component of 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 memory element of form 1 and the stiffening element 3.
  • the dimensions of the layer of the stiffening element 3 and reinforcing fabric 2 are such that, preferably, their surface is between 90 and 40% of the surface of the shape memory element 1.
  • the element to shape memory 1 has a trimming 1 'so as 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 zone 1 'of the element with shape memory 1.
  • the stiffening element 3 also has a 3 'trim to obtain a variation in thickness and progressive stiffness for not to harm the comfort of the user and to preserve also the aesthetics of the footwear (absence of marking).
  • Layers 1, 2 and 3 can be assembled by the process said of complexing corresponding to the superposition of different layers during the assembly of the article footwear.
  • the impregnation of the fabric 2 by the stiffening element 3 intervenes during the softening of the stiffening element during forming.
  • the fabric 2 is then previously impregnated with direct coating with the stiffening element 3, then laminated to the shape memory element 1.
  • the reinforcing element is mounted on the rod 4 of the same so that a hard tip or a heat-activated buttress usual.
  • the rod 4 of a footwear constitutes the outer shell of the reinforcing element while the fabric 2 impregnated with the stiffening element 3 performs the role of skin inside in the fitted footwear.
  • the reinforcing element can however be covered internally with a protective fabric or film and cleanliness 6.
  • Such a reinforcing element allow reinforcement of footwear during a cycle of normal manufacturing without the need to excessive temperature increases but, in in addition, it gives said article of footwear an improvement stiffness and shock resistance characteristics of reinforced areas of said footwear during crushing or low energy shock.
  • the variation of the thickness of the reinforcing element preserves user comfort and aesthetics footwear.
  • this reinforcing element can be used to reinforce any part of the stem, the dimensions and the shape of said element then being chosen according to the rod area to be reinforced.

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  • 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 heat-activating reinforcing element, as a complex, and used in manufacturing 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 of their manufacture by providing for the establishment of heel and ankle buttresses 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 consisting of strips of fabric impregnated with a dispersion of elements synthetics of carboxylated styrene-butadiene polymer. The faces of the layer thus produced are then, for one, coated with a dispersion of synthetic materials suitable for imparting to said face the appearance of suede while being abrasion resistant and, for the other, coated with example by a sticky coating allowing its sticking to hot 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. We also know from EP-A-0 102 414 a structure laminated with 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 solvent-activated adhesive or heating allowing the bonding of this laminated structure as reinforcement on a substrate.

Le brevet américain US-A-5 354 604 concerne également un matériau composite servant de renfort, constitué d'une âme en résine thermoplastique thermodéformable, 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. American patent US-A-5 354 604 also relates to a composite material serving as reinforcement, consisting of a core in thermo-deformable thermoplastic resin, layers of woven being placed on either side of said core and linked to these by layers of resins. Layers of woven material have sufficient thickness to impart sufficient rigidity and strength to the structure composite. It is preferable to use woven fibers carbon, glass or aramid. This composite material can then be 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 protective properties, it turns out that these products are mostly unsuitable for use during of the current manufacture of footwear. Indeed, either it is necessary to heat the structures composites at high temperatures to be able to put them in form, or it is necessary to subject the article putting on a subsequent cooking. In both cases, it there is a risk of degradation of the other components of the article of footwear and a significant elongation manufacturing cycle times.

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 material reinforced with of a fibrous element included within a thickness of synthetic material. In a first form of realization, an area of a footwear component is subjected to a first direct coating by the material synthetic, the fibrous element is then affixed to   the plaster and pressed so that the molten plaster 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 element of reinforcement, joining the first plaster in the macroscopic openings 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 both cases, the process requires submission of the footwear to very high temperatures in order to apply the material synthetic melted as 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 high temperatures during the cycle manufacturing footwear that may cause damage of said material to be reinforced. In addition, the coating procedure of the material to be reinforced lengthens the time of the manufacturing cycle of said footwear. Of more, the described method envisages only the realization a reinforcement directly on the material of the article footwear during its manufacturing cycle, the material to be reinforced, which should automatically be severe temperature conditions 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 allow welding or bonding between two compounds which are not stickable or weldable with each other, these compounds which may constitute two elements to be linked footwear. To this end, the fibrous support comprises on one side an outer layer with which one of compounds is identical or bondable or weldable and the other side an outer layer with which the other compound is identical or bondable or weldable, chemical or mechanical. The fiber support can possibly also constitute an element of stiffening 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 et comprenant un élément à mémoire de forme thermoactivable, caractérisé en ce qu'il est sous forme de complexe et constitué d'au moins trois éléments en couches, lesdits éléments étant:

  • l'un élément à mémoire de forme thermoactivable,
  • un élément de rigidification thermoactivable, et
  • un tissu de renfort 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 dans la plage des températures utilisées au cours d'un cycle de fabrication d'un article chaussant.
    • To this end, the subject of the invention is a thermo-activatable reinforcing element intended to be put in place in an article of footwear and comprising a thermo-activatable memory element, characterized in that it is in the form of a complex and consists of at least three elements in layers, said elements being:
  • one thermoactivable shape memory element,
  • a thermoactivable stiffening element, and
  • a reinforcing fabric inserted between the first two elements, said stiffening element permeating said reinforcing fabric and having a softening point lower than the melting point of the fibers of said reinforcing fabric, said stiffening element and said shape memory element being thermoactivable in the range of temperatures used 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. De préférence, on utilise tout matériau thermoactivable à des températures compatibles avec le cycle de fabrication de l'article chaussant, présentant une mémoire de forme tel qu'un copolymère éthylène-acide métacrylique 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 footwear. Preferably, any material is used thermoactivable at temperatures compatible with the manufacturing cycle of the footwear, having a shape memory such as an ethylene-acid copolymer   metacrylic sold under the registered trademark SURLYN or of the type sold under the trademark IMPERFIRM.

    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 footwear. The layer of the stiffening element can be made by direct coating of the reinforcing fabric by said resin.

    Avantageusement, le tissu de renfort 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 reinforcing fabric allows, for its part, to limit the creep of the other two laminated elements during a brief or permanent request such as crushing or slipping of the foot in the article footwear, insofar as the fibers of the fabric tensile stresses also have a low elongation capacity.

    A cet effet, le tissu de renfort est un tissu de faible grammage compris dans une plage de 40 à 80 g/m2 et dont la contrainte à la rupture en traction est supérieure à 1000 Mpa et le module de traction est supérieur à 30000 Mpa. For this purpose, the reinforcement fabric is a fabric of low grammage included in a range of 40 to 80 g / m 2 and whose tensile breaking stress is greater than 1000 Mpa and the tensile modulus is greater than 30000 Mpa .

    Le tissu de renfort est de préférence un tissu de fibres d'aramide dont le grammage est de 60 g/m2. The reinforcing fabric is preferably an aramid fiber fabric whose grammage is 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 thermoactivable. 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 reinforcing fabric and 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 allows a reinforcement of footwear without requiring significant change in the manufacturing cycle usual, the forming temperatures, in particular the deformation of the stiffening element and of the element with shape memory, being less than 100 ° C. So there more risk of degradation of the other constituents of footwear.

    On décrira maintenant l'invention plus en détail en référence au dessin dans lequel :

  • la figure 1 représente une vue en coupe d'un élément de renfort selon l'invention ; et
  • la figure 2 représente une vue en coupe d'un article chaussant renforcé par l'élément de renfort de la figure 1.
    • The invention will now be described in more detail with reference to the drawing in which:
  • Figure 1 shows a sectional view of a reinforcing element according to the invention; and
  • FIG. 2 represents a sectional view of an article of footwear reinforced by the reinforcement element of FIG. 1.

    • L'élément de renfort est obtenu par la superposition à plat des trois couches distinctes. The reinforcing element is obtained by layering 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 shape memory element 1 preferably has a cutting and a dimension suitable to constitute either a buttress is a standard hard end, its thickness being between 0.5 and 1.5 mm. It is coated on its external face by a hot-melt adhesive allowing its subsequent bonding on the upper 4 of an article of footwear. Her shape memory allows it to return to its original shape after deformation by shock or stress accidental.   The light weight reinforcement fabric 2 is, from preferably an aramid fiber fabric impregnated with the stiffening element 3.

    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 stiffening element 3 is preferably consisting of poly "caprolactone" and has a point softening between 55 and 70 ° C. It covers the reinforcement fabric 2 so that it has a local thickness increase between 0.2 and 0.8 mm.

    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. Reinforcement fabric 2 and element layer of stiffening 3 have the same dimensions and the fabric 2 is positioned so that the fibers component of 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.

    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 à90° par rapport à l'axe longitudinal de l'article chaussant) pourrait être retenue sans faire novation. This positioning of the fibers gives the reinforcing element ease of forming insofar as this avoids the fold formation. However, another orientation of fibers making up the reinforcement fabric (from 0 to 90 ° relative to to the longitudinal axis of the footwear) could be retained without 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 reinforcement fabric 2 is located between the memory element of form 1 and the stiffening element 3.

    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 layer of the stiffening element 3 and reinforcing fabric 2 are such that, preferably, their surface is between 90 and 40% of the surface of the shape memory element 1.

    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 to shape memory 1 has a trimming 1 'so as not to   mark the shoe after mounting on the upper 4 and in a sole 5.

    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 fabric 2 and the layer of the stiffening element 3 are also such that these do not cover the trimming zone 1 'of the element with shape memory 1. The stiffening element 3 also has a 3 'trim to obtain a variation in thickness and progressive stiffness for not to harm the comfort of the user and to preserve also the aesthetics of the footwear (absence of marking).

    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. Layers 1, 2 and 3 can be assembled by the process said of complexing corresponding to the superposition of different layers during the assembly of the article footwear. In this case, the impregnation of the fabric 2 by the stiffening element 3 intervenes during the softening of the stiffening element during forming.

    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 the entire element of reinforcement. The fabric 2 is then previously impregnated with direct coating with the stiffening element 3, then laminated to the shape memory element 1.

    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 rod 4 of the same so that a hard tip or a heat-activated buttress usual.

    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 rod 4 of a footwear constitutes the outer shell of the reinforcing element while the fabric 2 impregnated with the stiffening element 3 performs the role of skin inside in the fitted footwear. Of course, the reinforcing element can however be covered internally with a protective fabric or film and cleanliness 6.  

    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 cycle of normal manufacturing without the need to excessive temperature increases but, in in addition, it gives said article of footwear an improvement stiffness and shock resistance characteristics of reinforced areas of said footwear during crushing or low energy shock.

    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 reinforcing element preserves user comfort and aesthetics 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 stem, the dimensions and the shape of said element then being chosen according to the rod area to be reinforced.

    Claims (10)

    1. Heat-activatable reinforcing element intended to be placed in an article of footwear and comprising a heat-activatable, shape-retaining element (1), characterised in that it is in a complex form and is made up of at least three elements in layers, said elements being:
      the heat-activatable shape-retaining element (1),
      a heat-activatable stiffening element (3), and
      a reinforcing fabric (2) 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.
    2. Reinforcing element according to claim 1, characterised in that the reinforcing fabric (2) is a fabric of low weight within a range of 40 to 80 g/m2, and the tension breaking pressure of which fabric is greater than 1000 Mpa, and the modulus of tension thereof is greater than 30000 Mpa.
    3. Reinforcing element according to one of claims 1 and 2, characterised in that the reinforcing fabric (2) is a fabric of aramide fibres weighing 60 g/m2.
    4. Reinforcing element according to one of claims 1 to 3, characterised in that the stiffening element (3) is a heat-activatable and heat-adherable resin, the softening point of which is lower than 100° C.
    5. Reinforcing element according to claim 4, characterised in that the stiffening element (3) is formed by poly "caprolactone" 6.
    6. Reinforcing element according to one of claims 1 to 5, characterised in that the shape-retaining element (1) is a thermoplastic material such as an ethylene-methacrylic acid copolymer.
    7. Reinforcing element according to one of claims 1 to 6, characterised in that the layers (1), (2) and (3) are fitted by a method known as complexing.
    8. Reinforcing element according to one of claims 1 to 6, 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).
    9. Article of footwear comprising a reinforcing element according to any one of claims 1 to 8.
    10. Article of footwear according to claim 9, 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.
    EP97905205A 1996-02-15 1997-02-14 Heat-activatable reinforcing element for footwear, and footwear comprising same Expired - Lifetime EP0880327B2 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    FR9601882A FR2744889B1 (en) 1996-02-15 1996-02-15 HEAT-ACTIVABLE REINFORCEMENT MEMBER FOR FOOTWEAR AND FOOTWEAR COMPRISING SUCH A REINFORCEMENT MEMBER
    FR9601882 1996-02-15
    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 true EP0880327B1 (en) 1999-11-10
    EP0880327B2 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)

    Family Cites Families (5)

    * Cited by examiner, † Cited by third party
    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
    US4717496A (en) † 1984-12-03 1988-01-05 Giulini Chemie Gmbh Stiffening material with melt-adhesive properties
    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

    Also Published As

    Publication number Publication date
    DE69700777T3 (en) 2003-04-10
    FR2744889A1 (en) 1997-08-22
    FR2744889B1 (en) 1998-04-03
    ES2138860T5 (en) 2003-03-01
    ES2138860T3 (en) 2000-01-16
    EP0880327B2 (en) 2002-08-14
    DE69700777T2 (en) 2000-06-08
    WO1997029657A1 (en) 1997-08-21
    AU1883897A (en) 1997-09-02
    DE69700777D1 (en) 1999-12-16
    EP0880327A1 (en) 1998-12-02

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