WO1997029657A1 - 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
WO1997029657A1
WO1997029657A1 PCT/FR1997/000282 FR9700282W WO9729657A1 WO 1997029657 A1 WO1997029657 A1 WO 1997029657A1 FR 9700282 W FR9700282 W FR 9700282W WO 9729657 A1 WO9729657 A1 WO 9729657A1
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WO
WIPO (PCT)
Prior art keywords
footwear
fabric
reinforcement
reinforcing
element according
Prior art date
Application number
PCT/FR1997/000282
Other languages
French (fr)
Inventor
Jacques Lesauce
Original Assignee
Jallatte
Priority date (The priority date 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 date listed.)
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9489234&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1997029657(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Jallatte filed Critical Jallatte
Priority to EP97905205A priority Critical patent/EP0880327B2/en
Priority to DE69700777T priority patent/DE69700777T3/en
Priority to AU18838/97A priority patent/AU1883897A/en
Publication of WO1997029657A1 publication Critical patent/WO1997029657A1/en

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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

  • Heat-activating reinforcing element for footwear and footwear comprising such a reinforcing element.
  • the invention relates to a heat-activating reinforcing element, in the form of a complex, and used in the manufacture of footwear.
  • FR-A-2 065 960 describes a composite material consisting of strips of fabrics impregnated with a dispersion of synthetic elements of styrene-butadiene carboxyl polymer.
  • the faces of the layer thus produced are then, for one, coated with a dispersion of synthetic materials capable of imparting to said face the appearance of suede while being resistant to abrasion and, for the other, coated for example by a sticky coating allowing its hot bonding in a shoe.
  • EP-A-0 102 414 also discloses a laminated structure comprising a core of thermoplastic resin, layers of fabric 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 adhesive which can be activated by solvent or by heating allowing the bonding of this laminated structure as reinforcement on a substrate.
  • American patent US Pat. No. 5,354,604 also relates to a composite material serving as reinforcement, consisting of a core of thermo-deformable thermoplastic resin, layers of woven fabric being placed on either side of said core and bonded to them. by layers of resins.
  • the layers of woven have sufficient thickness to give sufficient rigidity and strength to the composite structure.
  • woven carbon, glass or aramid fibers are used. This composite material can then be shaped by heating in a mold.
  • a material reinforced with a fibrous element included within a thickness of synthetic material is also known from patent FR-A-2,108,913 and its addition FR-A-2,106,526, a material reinforced with a fibrous element included within a thickness of synthetic material.
  • an area of a footwear component is subjected to a first direct coating with the synthetic material, the fibrous element is then affixed to the coating and pressed so that the molten coating penetrates into 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 coated in the macroscopic openings of the fibrous element.
  • the fibrous element is embedded by the application of pressure within a single layer of coating of synthetic material. In these two cases, the process requires subjecting the footwear to very high temperatures in order to apply the molten synthetic material in the form of a coating.
  • the coating of the material to be reinforced with a synthetic material in molten form necessarily results in high temperatures during the manufacturing cycle of the footwear which can cause damage to said material to be reinforced.
  • the procedure of coating the material to be reinforced lengthens the time of the manufacturing cycle of said footwear.
  • the method described only envisages the production of a reinforcement directly on the material of the footwear during its manufacturing cycle, the material to be reinforced having to be automatically subjected to the severe temperature conditions mentioned above.
  • DE-A-41 20 134 describes a fiber support capable of allowing welding or bonding between two compounds which are not bondable or weldable with each other, these compounds possibly constituting two elements to be bonded to an article of footwear .
  • the fibrous support comprises on one side an outer layer 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 this, either chemically or mechanically.
  • the fiber support can optionally also constitute a stiffening element between the two compounds.
  • JP-A-3221001 discloses a process for manufacturing reinforced footwear using a reinforcement body formed from a shape memory polymer and previously shaped in curved form along a shoe mold shape.
  • the reinforcement body is then heated and deformed in a plane form at a temperature below the molding temperature and is then introduced into a pocket then fixed on the shape retention area of the upper of the shoe. Then heated to a temperature allowing the reinforcing body to recover its original curved shape thus causing the shaping of the upper of the shoe.
  • the subject of the invention is a heat-activatable reinforcing element, in the form of a complex, intended to be put in place in an article of footwear and consisting of at least three layered elements, characterized in that said elements are: a thermoactivable shape memory element, a thermoactivable stiffening element, and a reinforcement fabric inserted between the first two elements, said stiffening element permeating said reinforcement 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 heat-activatable in the range of temperatures used during a manufacturing cycle for a footwear item.
  • said elements are: a thermoactivable shape memory element, a thermoactivable stiffening element, and a reinforcement fabric inserted between the first two elements, said stiffening element permeating said reinforcement 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 heat-activatable in the range of temperatures used
  • the reinforcing element therefore consists of three elements in separate layers, each of these elements having their own characteristics giving the reinforcing element specific properties.
  • the reinforcing element according to the invention can be defined 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 of a tip or buttress of standard type and the second part consisting of the reinforcing fabric and the stiffening element whose characteristics constitute a local reinforcement for the shape memory element.
  • the shape memory element gives the footwear an ability to recover its initial shape even after having undergone a deformation, for example by impact. It therefore contributes to maintaining the aesthetic integrity of said footwear.
  • any thermoactivatable material is used 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 registered trademark IMPERFIRM.
  • the stiffening element is a heat-activatable and heat-sealable resin chosen so as to locally stiffen the area of the reinforcing fabric at ambient temperature, which it impregnates by a local increase in thickness while having a low softening point, preferably less than 100 "C, to allow forming at temperatures compatible with the temperatures of the manufacturing cycle for an article of footwear.
  • the layer of the stiffening element can be produced by direct coating of the reinforcement fabric with said resin.
  • the reinforcing fabric makes it possible to limit the creep of the two other elements laminated during a brief or permanent stress such as crushing or sliding of the foot in the footwear, insofar as the fabric fibers stressed in tension 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 optimal reinforcement in terms of resistance to wear and tear and also limits the risk of irritation to the feet of the user.
  • the reinforcing element thus produced is mounted on the internal face of a rod to locally reinforce an article.
  • footwear in the same way as a usual thermoactivatable reinforcement.
  • the shape memory element which acts as a standard hard toe or buttress, is preferably attached to the upper of the footwear so that the reinforcement fabric and the stiffening element are placed at the inside said article of footwear.
  • the reinforcing element thus produced makes it possible to reinforce a footwear item without requiring significant modification in the usual manufacturing cycle, the forming temperatures, in particular the deformation of the stiffening element and of the memory element. in shape, being less than 100 "C. There is therefore no longer any risk of degradation of the other constituents of the footwear.
  • Figure 1 shows a sectional view of a reinforcing element according to the invention.
  • FIG. 2 represents a sectional view of an article of footwear reinforced by the reinforcement element of FIG. 1.
  • the reinforcing element is obtained by the flat superposition of the three distinct layers.
  • the shape memory element 1 preferably has a cutout and a dimension suitable for constituting either a buttress or a hard end of standard type, 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 upper 4 of a footwear item. Its shape memory allows it to return to its initial shape after deformation by impact or accidental stress.
  • the light-weight reinforcement fabric 2 is preferably an aramid fiber fabric impregnated with the stiffening element 3.
  • Said stiffening element 3 is preferably constituted by poly "caprolactone" and has a softening point between 55 and 70 * C. It covers the reinforcement fabric 2 so that it has a local increase in thickness included between 0.2 and 0.8 mm.
  • the reinforcing fabric 2 and the stiffening element layer 3 have the same dimensions and the fabric 2 is positioned so that the fibers making up the fabric are preferably oriented at +/- 45 * relative 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
  • the reinforcing element has a structure such that the reinforcing fabric 2 is located between the shape memory element 1 and the stiffening element 3.
  • the reinforcing fabric 2 are such that, preferably, their surface is between 90 and 40% of the surface of the shape memory element 1.
  • the shape memory element 1 has a trim 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 of the layer of the stiffening element 3 are also such that these do not cover the trimming zone l ′ of the shape memory element 1.
  • the stiffening element 3 also has a trimming 3 'in order to obtain a variation in thickness and progressive rigidity so as not to harm the comfort of the user and to also preserve the aesthetics of the footwear (absence of marking).
  • the layers 1, 2 and 3 can be mounted by the so-called complexing process corresponding to the superposition of the different layers during the mounting of the footwear.
  • the impregnation of the fabric 2 by the stiffening element 3 occurs during the softening of the stiffening element during forming.
  • the fabric 2 is then previously impregnated by direct coating with the stiffening element 3, then laminated to the shape memory element 1.
  • the reinforcing element is mounted on the rod 4 in the same way as a hard end or a usual thermoactivable buttress.
  • the upper 4 of an article of footwear constitutes the outer envelope of the reinforcing element while the fabric 2 impregnated with the stiffening element 3 acts as an inner skin in the fitted footwear.
  • the reinforcing element can however be covered internally with a fabric or a protective and cleanliness film 6. Not only does such a reinforcing element allow a reinforcement of footwear item during a normal manufacturing cycle without it being necessary to carry out excessive temperature increases but, moreover, it confers on said footwear item an improvement characteristics of rigidity and impact resistance of the reinforced areas of said footwear during crushing or low energy impact.
  • the variation in the thickness of the reinforcing element preserves the comfort of the user and the 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 as a function of the zone of the rod to be reinforced.

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  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

A heat-activatable reinforcing element in the form of a complex intended to be placed in footwear and made up of at least three layer elements. Said elements are a heat-activatable shape-memory element (1), a heat-activatable stiffening element (3), and a reinforcing fabric (2) inserted between the first two elements (1, 3). Said stiffening element (3) impregnates said reinforcing fabric (2) and has a softening point lower than the melting point of the fibres in the reinforcing fabric (2). Said stiffening element (3) and said shape-memory element may be heat-activated within the temperature range used during one footwear production cycle. Said element may be used in footwear.

Description

Elément de renfort thermoactivable pour articles chaussants et article chaussant comportant un tel élément de renfort. Heat-activating reinforcing element for footwear and footwear comprising such a reinforcing element.
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, 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 establishment 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 carboxyle. 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 fabrics impregnated with a dispersion of synthetic elements of styrene-butadiene carboxyl polymer. The faces of the layer thus produced are then, for one, coated with a dispersion of synthetic materials capable of imparting to said face the appearance of suede while being resistant to abrasion and, for the other, coated for example by a sticky coating allowing its hot bonding in a shoe.
On connaît 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.EP-A-0 102 414 also discloses a laminated structure comprising a core of thermoplastic resin, layers of fabric 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 adhesive which can be activated by solvent or by 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 Pat. No. 5,354,604 also relates to a composite material serving as reinforcement, consisting of a core of thermo-deformable thermoplastic resin, layers of woven fabric being placed on either side of said core and bonded to them. by layers of resins. The layers of woven have sufficient thickness to give sufficient rigidity and strength to the composite structure. Preferably, woven carbon, glass or aramid fibers are used. 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 as to their workability and their protective properties, it turns out that these products are most of the time unsuitable for use during the current manufacture of footwear. Indeed, either it is necessary to heat the composite structures at high temperatures in order to be able to shape them, or it is necessary to subject the footwear article to subsequent cooking. In these two cases, there is a risk of degradation of the other components of the footwear as well as a non-negligible lengthening of the manufacturing cycle times.
On connaît 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.Also known from patent FR-A-2,108,913 and its addition FR-A-2,106,526, a material reinforced with a fibrous element included within a thickness of synthetic material. In a first embodiment, an area of a footwear component is subjected to a first direct coating with the synthetic material, the fibrous element is then affixed to the coating and pressed so that the molten coating penetrates into 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 coated in the macroscopic openings of the fibrous element. According to a second embodiment, the fibrous element is embedded by the application of pressure within a single layer of coating of synthetic material. In these two cases, the process requires subjecting the footwear to very high temperatures in order to apply the molten synthetic material in the form of a coating.
Là encore, l'enduction de la matière à renforcer par une matière synthétique sous forme fondue entraîne nécessairement des températures élevées au cours du cycle de fabrication de l'article chaussant pouvant entraîner 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.Here again, the coating of the material to be reinforced with a synthetic material in molten form necessarily results in high temperatures during the manufacturing cycle of the footwear which can cause damage to said material to be reinforced. In addition, the procedure of coating the material to be reinforced lengthens the time of the manufacturing cycle of said footwear. In addition, the method described only envisages the production of a reinforcement directly on the material of the footwear during its manufacturing cycle, the material to be reinforced having to be automatically subjected to the severe temperature conditions mentioned above.
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 1•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 capable of allowing welding or bonding between two compounds which are not bondable or weldable with each other, these compounds possibly constituting two elements to be bonded to an article of footwear . To this end, the fibrous support comprises on one side an outer layer 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 this, either chemically or mechanically. The fiber support can optionally also constitute a stiffening element between the two compounds. However, this applies in particular to compounds such that, in the melting temperature range of one, the other remains stable. Such a structure cannot therefore be used to obtain a reinforcement of thermoformable footwear article.
On connaît 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 entraînant ainsi la mise en forme de la tige de la chaussure.JP-A-3221001 discloses a process for manufacturing reinforced footwear using a reinforcement body formed from a shape memory polymer and previously shaped in curved form along a shoe mold shape. The reinforcement body is then heated and deformed in a plane form at a temperature below the molding temperature and is then introduced into a pocket then fixed on the shape retention area of the upper of the shoe. Then heated to a temperature allowing the reinforcing body to recover its original curved shape thus causing the shaping of 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 insofar as it is only applicable to a reinforcement body made up solely of a shape memory material and cannot be applied to composite structures of which one of the elements would not be not with shape memory, which limits the properties of the reinforcement 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 drawback should therefore be remedied by proposing a reinforcement which can be used during the manufacture of a reinforced footwear, for example in the front and rear areas, without it being necessary to impose significant modifications to current manufacturing techniques. , in particular as regards the temperature and the time of the manufacturing cycle while offering good, even better, reinforcing properties.
A cet effet, l'invention a pour objet un élément de renfort thermoactivable, sous forme de complexe, destiné à être mis en place dans un article chaussant et constitué d'au moins trois éléments en couches, caractérisé en ce que lesdits éléments sont : 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 heat-activatable reinforcing element, in the form of a complex, intended to be put in place in an article of footwear and consisting of at least three layered elements, characterized in that said elements are: a thermoactivable shape memory element, a thermoactivable stiffening element, and a reinforcement fabric inserted between the first two elements, said stiffening element permeating said reinforcement 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 heat-activatable in the range of temperatures used during a manufacturing cycle for a footwear item.
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 these elements having their own characteristics giving the reinforcing element 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 defined 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 of a tip or buttress of standard type and the second part consisting of the reinforcing fabric and the stiffening element whose characteristics constitute a local reinforcement for the shape memory element.
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 copolymere éthylène-acide métacrylique vendu sous la marque déposée SURLYN ou encore du type vendu sous la marque déposée IMPERFIRM.The shape memory element gives the footwear an ability to recover its initial shape even after having undergone a deformation, for example by impact. It therefore contributes to maintaining the aesthetic integrity of said footwear. Preferably, any thermoactivatable material is used 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 registered 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-activatable and heat-sealable resin chosen so as to locally stiffen the area of the reinforcing fabric at ambient temperature, which it impregnates by a local increase in thickness while having a low softening point, preferably less than 100 "C, to allow forming at temperatures compatible with the temperatures of the manufacturing cycle for an article of footwear. The layer of the stiffening element can be produced by direct coating of the reinforcement fabric with 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 makes it possible to limit the creep of the two other elements laminated during a brief or permanent stress such as crushing or sliding of the foot in the footwear, insofar as the fabric fibers stressed in tension 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 optimal reinforcement in terms of resistance to wear and tear and also limits the risk of irritation to the feet of 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 internal face of a rod to locally reinforce an article. footwear in the same way as a usual thermoactivatable reinforcement. The shape memory element, which acts as a standard hard toe or buttress, is preferably attached to the upper of the footwear so that the reinforcement fabric and the stiffening element are placed at the inside said article of 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 a footwear item without requiring significant modification in the usual manufacturing cycle, the forming temperatures, in particular the deformation of the stiffening element and of the memory element. in shape, being less than 100 "C. There is therefore no longer any risk of degradation of the other constituents of the footwear.
On décrira maintenant l'invention plus en détail en référence au dessin dans lequel :The invention will now be described in more detail with reference to the drawing in which:
la figure 1 représente une vue en coupe d'un élément de renfort selon l'invention ; etFigure 1 shows a sectional view of a reinforcing element according to the invention; and
la figure 2 représente une vue en coupe d'un article chaussant renforcé par l'élément de renfort de la figure 1.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 the flat superposition of the three distinct 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 cutout and a dimension suitable for constituting either a buttress or a hard end of standard type, 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 upper 4 of a footwear item. Its shape memory allows it to return to its initial shape after deformation by impact or accidental stress. The light-weight reinforcement fabric 2 is 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 constituted by poly "caprolactone" and has a softening point between 55 and 70 * C. It covers the reinforcement fabric 2 so that it has a local increase in thickness included 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 renfortThe reinforcing fabric 2 and the stiffening element layer 3 have the same dimensions and the fabric 2 is positioned so that the fibers making up the fabric are preferably oriented at +/- 45 * relative 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 par l'élément de rigidification 3.2 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 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 reinforcing fabric 2 is located between the shape memory element 1 and the stiffening element 3.
Les dimensions de la couche de l'élément de rigidificationThe dimensions of the layer of the stiffening element
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 1.3 and the 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 shape memory element 1 has a trim 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 l' 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 of the layer of the stiffening element 3 are also such that these do not cover the trimming zone l ′ of the shape memory element 1. The stiffening element 3 also has a trimming 3 'in order to obtain a variation in thickness and progressive rigidity so as not to harm the comfort of the user and to also preserve 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.The layers 1, 2 and 3 can be mounted by the so-called complexing process corresponding to the superposition of the different layers during the mounting of the footwear. In this case, the impregnation of the fabric 2 by the stiffening element 3 occurs 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.It is also possible to prefabricate the whole of the reinforcing element. The fabric 2 is then previously impregnated by 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 in the same way as a hard end or a usual thermoactivable buttress.
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. 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.As can be seen in FIG. 2, the upper 4 of an article of footwear constitutes the outer envelope of the reinforcing element while the fabric 2 impregnated with the stiffening element 3 acts as an inner skin in the fitted footwear. Of course, the reinforcing element can however be covered internally with a fabric or a protective and cleanliness film 6. Not only does such a reinforcing element allow a reinforcement of footwear item during a normal manufacturing cycle without it being necessary to carry out excessive temperature increases but, moreover, it confers on said footwear item an improvement characteristics of rigidity and impact resistance of the reinforced areas of said footwear during crushing or low energy impact.
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 in the thickness of the reinforcing element preserves the comfort of the user and the 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 as a function of the zone of the rod to be reinforced.

Claims

REVENDICATIONS
1. Elément de renfort thermoactivable, sous forme de complexe, destiné à être mis en place dans un article chaussant et constitué d'au moins trois éléments en couches, caractérisé en ce que lesdits éléments sont : un élément à mémoire de forme thermoactivable (1), un élément de rigidification thermoactivable (3), et un tissu de renfort (2) inséré entre les deux premiers éléments (1 et 3), ledit élément de rigidification (3) imprégnant ledit tissu de renfort (2) et présentant un point de ramollissement inférieur au point de fusion des fibres dudit tissu de renfort (2), ledit élément de rigidification (3) 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.1. thermoactivable reinforcing element, in the form of a complex, intended to be put in place in an article of footwear and consisting of at least three elements in layers, characterized in that said elements are: a thermoactivatable memory element ), a thermoactivable stiffening element (3), and a reinforcing fabric (2) inserted between the first two elements (1 and 3), said stiffening element (3) permeating said reinforcing fabric (2) and having a point softening point below the melting point of the fibers of said reinforcing fabric (2), said stiffening element (3) and said shape memory element being heat-activatable in the range of temperatures used during a manufacturing cycle of a footwear.
2. Elément de renfort selon la revendication 1, caractérisé en ce que le tissu de renfort (2) 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.2. Reinforcement element according to claim 1, characterized in that the reinforcement fabric (2) is a fabric of low grammage included in a range of 40 to 80 g / m 2 and whose tensile strength is greater at 1000 Mpa and the traction module is greater than 30,000 Mpa.
3. Elément de renfort selon l'une des revendications 1 et3. Reinforcement element according to one of claims 1 and
2, caractérisé en ce que le tissu de renfort (2) est un tissu de fibres d'aramide de grammage 60 g/m2.2, characterized in that the reinforcing fabric (2) is a fabric of aramid fibers having a grammage of 60 g / m 2 .
4. Elément de renfort selon l'une des revendications 1 à 3, caractérisé en ce que l'élément de rigidification (3) est une résine thermoactivable et thermocollable dont le point de ramollissement est inférieur à 100*C.4. Reinforcement element according to one of claims 1 to 3, characterized in that the stiffening element (3) is a heat-activated and heat-bondable resin whose softening point is less than 100 * C.
5. Elément de renfort selon la revendication 4, caractérisé en ce que l'élément de rigidification (3) est constitué par du poly" caprolactone " 6.5. Reinforcement element according to claim 4, characterized in that the stiffening element (3) consists of poly "caprolactone" 6.
6. Elément de renfort selon l'une des revendications 1 à 5, caractérisé en ce que l'élément à mémoire de forme (1) est un matériau thermoplastique tel qu'un copolymere éthylène- acide métacrylique.6. Reinforcement element according to one of claims 1 to 5, characterized in that the shape memory element (1) is a thermoplastic material such as an ethylene-metacrylic acid copolymer.
7. Elément de renfort selon l'une des revendications 1 à 6, caractérisé en ce que les couches (1), (2) et (3) sont montées par un procédé dit de complexage.7. Reinforcement element according to one of claims 1 to 6, characterized in that the layers (1), (2) and (3) are mounted by a process called complexing.
8. Elément de renfort selon l'une des revendications 1 à 6, caractérisé en ce qu'il est préfabriqué par contrecollage préalable sur l'élément à mémoire de forme (1) de l'ensemble constitué par le tissu (2) imprégné par enduction directe de l'élément de rigidification (3).8. Reinforcement element according to one of claims 1 to 6, characterized in that it is prefabricated by prior lamination on the shape memory element (1) of the assembly constituted by the fabric (2) impregnated with direct coating of the stiffening element (3).
9. Elément de renfort selon l'une des revendications 7 et 8, caractérisé en ce que le tissu de renfort (2) est positionné dans l'article chaussant de telle sorte que les fibres composant ledit tissu (2) soient orientées à +/- 45* par rapport à l'axe longitudinal de l'article chaussant.9. Reinforcement element according to one of claims 7 and 8, characterized in that the reinforcement fabric (2) is positioned in the footwear so that the fibers making up said fabric (2) are oriented at + / - 45 * relative to the longitudinal axis of the footwear.
10. Article chaussant comportant un élément de renfort selon l'une quelconque des revendications 1 à 9. 10. Footwear comprising a reinforcing element according to any one of claims 1 to 9.
PCT/FR1997/000282 1996-02-15 1997-02-14 Heat-activatable reinforcing element for footwear, and footwear comprising same WO1997029657A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP97905205A EP0880327B2 (en) 1996-02-15 1997-02-14 Heat-activatable reinforcing element for footwear, and footwear comprising same
DE69700777T DE69700777T3 (en) 1996-02-15 1997-02-14 HEAT ACTIVATING REINFORCEMENT ELEMENT FOR SHOES AND SHOES WITH SUCH AN ELEMENT
AU18838/97A AU1883897A (en) 1996-02-15 1997-02-14 Heat-activatable reinforcing element for footwear, and footwear comprising same

Applications Claiming Priority (2)

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
FR96/01882 1996-02-15

Publications (1)

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WO1997029657A1 true WO1997029657A1 (en) 1997-08-21

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PCT/FR1997/000282 WO1997029657A1 (en) 1996-02-15 1997-02-14 Heat-activatable reinforcing element for footwear, and footwear comprising same

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EP (1) EP0880327B2 (en)
AU (1) AU1883897A (en)
DE (1) DE69700777T3 (en)
ES (1) ES2138860T5 (en)
FR (1) FR2744889B1 (en)
WO (1) WO1997029657A1 (en)

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Publication number Priority date Publication date Assignee Title
JPS61118443A (en) * 1984-11-13 1986-06-05 Sumitomo Rubber Ind Ltd Rubber-plastic composite material
JPH03221001A (en) * 1990-01-27 1991-09-30 Asahi Corp Manufacture of shoe upper skin
DE4120134A1 (en) * 1991-06-19 1992-12-24 Uhl Sportartikel Karl Transfer support securing different materials together - is of fibre with coverings glued or welded to materials

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Publication number Priority date Publication date Assignee Title
CA863308A (en) * 1971-02-09 Addison W. Closson, Jr. Shoe lining and counter stiffener
US4717496A (en) † 1984-12-03 1988-01-05 Giulini Chemie Gmbh Stiffening material with melt-adhesive properties

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Publication number Priority date Publication date Assignee Title
JPS61118443A (en) * 1984-11-13 1986-06-05 Sumitomo Rubber Ind Ltd Rubber-plastic composite material
JPH03221001A (en) * 1990-01-27 1991-09-30 Asahi Corp Manufacture of shoe upper skin
DE4120134A1 (en) * 1991-06-19 1992-12-24 Uhl Sportartikel Karl Transfer support securing different materials together - is of fibre with coverings glued or welded to materials

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Title
DATABASE WPI Section Ch Week 8629, Derwent World Patents Index; Class A, AN 86-186077 (29) *
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PATENT ABSTRACTS OF JAPAN vol. 15, no. 504 (C - 0896) 19 December 1991 (1991-12-19) *

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FR2744889B1 (en) 1998-04-03
DE69700777D1 (en) 1999-12-16
EP0880327B2 (en) 2002-08-14
ES2138860T3 (en) 2000-01-16
ES2138860T5 (en) 2003-03-01
EP0880327B1 (en) 1999-11-10
DE69700777T2 (en) 2000-06-08
FR2744889A1 (en) 1997-08-22
EP0880327A1 (en) 1998-12-02
DE69700777T3 (en) 2003-04-10
AU1883897A (en) 1997-09-02

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