EP0971060B1 - Method for making pile loops on a web by knitting, pile loop fabric made according to his method, and its application - Google Patents

Method for making pile loops on a web by knitting, pile loop fabric made according to his method, and its application Download PDF

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Publication number
EP0971060B1
EP0971060B1 EP99401676A EP99401676A EP0971060B1 EP 0971060 B1 EP0971060 B1 EP 0971060B1 EP 99401676 A EP99401676 A EP 99401676A EP 99401676 A EP99401676 A EP 99401676A EP 0971060 B1 EP0971060 B1 EP 0971060B1
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EP
European Patent Office
Prior art keywords
support
loops
loop
needles
lancet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99401676A
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German (de)
French (fr)
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EP0971060A1 (en
Inventor
Bernard Desgrand
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Aplix SA
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Aplix SA
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Publication date
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Publication of EP0971060A1 publication Critical patent/EP0971060A1/en
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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/02—Pile fabrics or articles having similar surface features
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B18/00—Fasteners of the touch-and-close type; Making such fasteners
    • A44B18/0023—Woven or knitted fasteners
    • A44B18/0034—Female or loop elements
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
    • D04B21/16—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes incorporating synthetic threads
    • D04B21/165—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes incorporating synthetic threads with yarns stitched through one or more layers or tows, e.g. stitch-bonded fabrics
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B23/00—Flat warp knitting machines
    • D04B23/08—Flat warp knitting machines with provision for incorporating pile threads
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2501/00—Wearing apparel
    • D10B2501/06—Details of garments
    • D10B2501/063—Fasteners
    • D10B2501/0632—Fasteners of the touch-and-close type

Definitions

  • hook-and-loop closures are of a widely used in the making of articles clothing, or in general, in applications servants.
  • Said closures consist of two parts.
  • a first part whose loops are intended to cooperate, in a separable attachment connection, with the additional elements of a second part, for example hooks, filiform elements with bulging heads or analogues, etc ...
  • a known economical process for making, by example in the form of bands, of the part comprising the buckles of this type of closures consists in making a laminate formed by a chained or screened fabric with loops laminated on a support.
  • the present invention therefore relates to a process for manufacturing a loop fabric, the steps of which are fewer and simpler than those involved in the production of a laminate.
  • a process of this kind is implemented on a knitting loom modified to produce a loop fabric, described in US Patent No. 4,003,222, published on 18 January 1977.
  • the modification consists of the transformation from the fixed lancet system to a mobile system.
  • the lateral displacement of the lancets then makes it possible to create high speed loops, with a very high degree of dimensional stability, on a knitted background.
  • Another known method consists in inserting curls in a leaf.
  • the material of the sheet can have all the desired characteristics at once of resistance and flexibility.
  • the main machine is the loom manufactured by the MALIMO company, which produces mesh loops from single or double knit weave.
  • the machine has a fixed lancet bar.
  • the fixity of the lancets has the harmful consequence the fact that the loops produced by these processes are lying on the surface of their support. Ease of attachment of the complementary elements of the closure is so naturally diminished compared to the result that we could expect the use of loops perfectly straight.
  • the present invention therefore relates to a method of formation by knitting loops on a support, by example a sheet, aimed at overcoming the disadvantages of previous manufacturing methods.
  • Its specific object is a method of looping, appealing, as a means known per se, to a crossbar of needles each comprising a closure wire and a hook, and at minus a crossbar of passettes. These bars are located on either side of said sheet, so conventional.
  • a crossbar of lancets longitudinal cantilever is also used.
  • the sheet is driven in continuous from upstream to downstream on a loom, these bars of which are the main components, especially for obtaining a loop fabric constituting one of the two cooperating parts of a hook-and-loop closure.
  • the longitudinal columns of loops are made on one side of the sheet by making pass the knitting threads brought by the passettes on the corresponding lancets, on the one hand.
  • loops are retained on the sheet by passing the son on the other side of the sheet.
  • one side of the fabric is obtained loops, alternately oriented left and right transversely, and on the other side of the fabric (below, side of the needles) stitches that hold the loops in approximately vertical position.
  • a large part up to 50% is used to form the stitches, the rest used for the loops.
  • the process according to the invention provides an additional step in which the stitches are pulled down, so that the wire on the upper part forming the intermediate loop is pressed against the fabric and the mesh threads are away from the fabric to form a double loop.
  • the impacts of the needles on the support are effected in a zigzag. This provides better retention of the loops on the support.
  • DE 1267372 describes a loop fabric according to the preamble to claim 1. This system has a complicated configuration of the retaining section network, this which slows down knitting. In addition, the loops are there poorly retained.
  • the present invention also relates to a fabric with loops according to claim 1.
  • the vast majority of the wire used to form the loops which is particularly advantageous in the case of a female part of an element Velcro where you want the thread to be used mainly for form the loops, which are the active elements of this female part.
  • each section of retainer is fully in contact with the support.
  • the length of wire used to form the sections of restraint is thus minimal.
  • each loop section consists of a double loop.
  • the loop fabric according to the present invention thus very advantageously columns of loops, formed by the meshes of the fabrics of the prior art, comprising a double loop per step, the feet of which are substantially perpendicular to the sheet.
  • the wires making up the loops are preferably polyamide or polyester yarns, while the sheet, or support, is preferably consisting of a polyester film or nonwoven, polyethylene or polypropylene with a grammage between 15 and 20 g / m2.
  • Typical use of loop fabric achieved by the process according to the invention is the manufacture of articles having parts of hook-and-loop fasteners advantageously fully constitutive of these articles instead of being reported, including diapers.
  • Figures 1a, 1b, 1c and 1d are the schematic views of a trade, suitable for implementing the process, showing the four essential stages of the first variant of the method of forming loops on a sheet by knitting according to the invention.
  • Figures 2a, 2b, 2c and 2d are the schematic views of a trade, suitable for implementing the process, showing the four essential stages of the second variant of the method of forming loops on a sheet by knitting according to the invention.
  • Figure 3a is a schematic top view (side chain) of a fabric produced according to the prior art.
  • Figure 3b is a schematic top view (side boucsle) of a fabric produced by the method according to the invention.
  • Figure 4 is a schematic top view of a other fabric according to the invention.
  • the sheet (2) is shown vertically and the loops (1) inserted horizontally, while in the in reality the needles (3) are most often vertical and below.
  • Closing wire operating devices (4) are also actually at the bottom, and therefore move from below at the top to close the needle (3) at the hook (5), and up and down to open it.
  • the needles are worn by a horizontal transverse bar, the cross section of which is not indicated as such. It is the same for the horizontal and transverse bar supporting the passettes (6), as well as for the lancet bar (7).
  • the wire (8) is brought on the passette (6) to form the loops (1) on the lancet (7) which will be fixed on the sheet (2) by the needle (3).
  • the profession represented is a profession operating in continuous: the loops (1) are knitted on the sheet (2) which moves from upstream to downstream (respectively from high below in the figures).
  • This needle-leaf-lancet-passette position is classic among manufacturers.
  • the loops are then, in known manner, carried out in the discarded position under the needle.
  • the loops (1) are made on a chain (from side opposite needles (3)), without throw, by displacement lancets (7).
  • Figure la shows the first stage of the knitting.
  • the needle (3) is in the low (or rear) position.
  • the wire (8) was pulled through the sheet (2) by the needle hook (5) (felling).
  • the closure wire (4) released the needle (3).
  • the leaf (2) advances by one stitch and the lancet (7) moves laterally by a needle (or several) to the right (9) (in the next cycle, the lancet will will move left (10)).
  • the passettes perform a lateral movement to the left (12) to wind the wire (8) on the lancet (7), under the needle (3) (thrown under).
  • the needle (3) advances towards the passette (6) and crosses the sheet (2).
  • the passette (6) passes through above the needle (3). It is then in position to engage the wire (8) in the hook (5) (thrown on) in step which follows, shown in Figure 1c.
  • the needle (3) begins its reverse (or descent), while the passette (6) is moves downstream (15) by placing itself under the needle (3). This has the effect of trapping the thread (8) in the needle (3), the closure wire (4) starting to close the latter.
  • the step shown in Figure 1d completes the cycle.
  • the closing thread (4) closed the needle (3).
  • the needle (3) continues its reverse (or descent) in driving the wire (8) through the previous stitch on the second side of the leaf (2) (felling).
  • the loop (2) is thus fixed on the first side (11), and the needle (3) continues to its lower position.
  • the closure wire (4) opens the needle and the cycle begins again.
  • the lancet (7) on the second side (16) of the sheet (2) that is to say on the side facing the needle, as seen on Figures 2a, 2b, 2c and 2d, is an unusual position for builders.
  • the loop is achieved by the mesh and is caused only by lateral displacement (9,10) of the lancet (7).
  • the four stages of the second variant of the process for training by knitting loops (1) on a sheet (2) according to the invention are similar to those set out above, relating to the first variant.
  • FIG. 3a shows schematically the tissue produced by the method of the prior art.
  • the grid intersections (G) represent the impact of the needle (3) through the sheet (2).
  • the loops (1) are shown in bold, viewed from above (side chain).
  • the dotted lines represent the wires (8) under the sheet (2) (mesh side).
  • the impact points are separated by a distance (Py), that is to say the pitch of the needles (3).
  • the punctures are distant from a predetermined distance (Px). This distance is at least equal to one needle pitch.
  • the method makes it possible to produce loops (1) of which the feet (20) are constituted by wires (8) emerging substantially perpendicular to the perforations of the support (2).
  • the process according to the invention makes it possible to make a loop fabric shown diagrammatically Figure 3b.
  • the loops (1) are shown in bold, seen from below (mesh side).
  • the dotted lines represent the wires (8) on the sheet (2) (chain side).
  • the loops (1) formed are double loops, the feet (21) of which are downstream, bites emerge substantially perpendicular to the sheet (2), and, upstream, are fixed by the following loop practically orthogonal to the support (2).
  • this percentage can be between 60% and 90%.
  • the loops (1) are not perfectly straight. They undergo a different orientation, but without common measurement with the articles produced by the formation by knitting on a sheet of the prior art.
  • a preferred embodiment of the fabric produced by the process according to the invention is a fabric made of a polyester film (2) or nonwoven (2), polyethylene or polypropylene with wire loops (1) (8) polyamide or polyester.
  • the grammage of the sheet (1) should preferably be between 15 and 20 g / m2.
  • loop fabric made by the method according to the invention does not contain loops over its entire surface. Only specific parts, adapted to the final article to be manufactured, are provided loops (1).
  • loops being an integral part of the article will be a plus high pull-out resistance compared to loops fixed on a support attached to the part.
  • the method according to the invention is therefore particularly suitable for the manufacture of articles for which the specifications of hook-and-loop closures are particularly severe, especially diapers.
  • FIG. 4 there is shown a following fabric an embodiment other than that of FIG. 3b.
  • the double loops are zigzag, this being due to a zigzag attack on the needles in the holder. We obtain thus better held double loops.

Description

Les fermetures dites auto-agrippantes sont d'un emploi extrêmement répandu dans la confection d'articles vestimentaires, ou en général, dans les applications domestiques.The so-called hook-and-loop closures are of a widely used in the making of articles clothing, or in general, in applications servants.

Lesdites fermetures sont constituées de deux parties. Une première partie dont les boucles sont destinées à coopérer, dans une liaison séparable d'accrochage, avec les éléments complémentaires d'une seconde partie, par exemple des crochets, des éléments filiformes à tête renflée ou analogues, etc...Said closures consist of two parts. A first part whose loops are intended to cooperate, in a separable attachment connection, with the additional elements of a second part, for example hooks, filiform elements with bulging heads or analogues, etc ...

Pour des raisons claires de prix de revient, particulièrement importantes lorsqu'il s'agit de produire en masse des articles à usage unique, notamment des couches-culottés, on est amené à rechercher des procédés économiques de fabrication.For clear cost reasons, particularly important when it comes to producing in mass of disposable articles, in particular diapers, we are led to seek economic processes Manufacturing.

Un procédé économique connu pour la confection, par exemple sous forme de bandes, de la partie comportant les boucles de ce type de fermetures, consiste à réaliser un laminé constitué par un tissu chaíné ou tramé à boucles contrecollé sur un support.A known economical process for making, by example in the form of bands, of the part comprising the buckles of this type of closures, consists in making a laminate formed by a chained or screened fabric with loops laminated on a support.

Cependant ce procédé est relativement compliqué dans la mesure où il exige la préparation séparée des deux couches extérieures du stratifié et ensuite une opération de collage techniquement complexe.However, this process is relatively complicated insofar as it requires the separate preparation of the two outer layers of the laminate and then an operation of technically complex collage.

La présente invention est donc relative à un procédé de fabrication d'un tissu à boucles dont les étapes sont moins nombreuses et plus simples que celles intervenant dans la réalisation d'un laminé.The present invention therefore relates to a process for manufacturing a loop fabric, the steps of which are fewer and simpler than those involved in the production of a laminate.

Un procédé de ce genre est mis en oeuvre sur un métier à tricoter modifié pour produire un tissu à boucles, décrit dans le brevet américain N° 4.003.222, publié le 18 janvier 1977. La modification consiste en la transformation du système de lancettes fixes en un système mobile. Le déplacement latéral des lancettes permet alors de créer des boucles à grande vitesse, avec un très haut degré de stabilité dimensionnelle, sur un fond de tricot.A process of this kind is implemented on a knitting loom modified to produce a loop fabric, described in US Patent No. 4,003,222, published on 18 January 1977. The modification consists of the transformation from the fixed lancet system to a mobile system. The lateral displacement of the lancets then makes it possible to create high speed loops, with a very high degree of dimensional stability, on a knitted background.

Le constructeur de cette machine, la société allemande LIBA MASCHINENFABRIK, avait ainsi résolu de façon originale et efficace le problème du contrôle optimal du fil.The manufacturer of this machine, the company German LIBA MASCHINENFABRIK, had thus resolved so original and effective the problem of optimal thread control.

C'est également en vue de l'augmentation de la vitesse et de la qualité de production que des passettes additionnelles peuvent être mises en oeuvre sur ce type de machine, comme par exemple, sur le métier à tricoter du même industriel, décrit dans la demande de brevet européen EP 511580, publiée le 4 novembre 1992.It is also with a view to increasing the speed and quality of production as passettes additional can be implemented on this type of machine, like for example, on the knitting loom of the same industrial, described in the European patent application EP 511580, published November 4, 1992.

Cependant, quelle que soit la qualité du produit réalisé, les problèmes inhérents à la structure mécaniquement fragile et dimensionnellement instable d'un tissu tricoté demeurent.However, regardless of the quality of the product realized, the problems inherent in the structure mechanically fragile and dimensionally unstable of a knitted fabric remain.

Un autre procédé connu consiste à insérer des boucles dans une feuille. Le matériau constituant la feuille pourra avoir toutes les caractéristiques voulues, à la fois de résistance et de souplesse.Another known method consists in inserting curls in a leaf. The material of the sheet can have all the desired characteristics at once of resistance and flexibility.

Il existe sur le marché plusieurs machines textiles pouvant mettre en oeuvre ce procédé.There are several textile machines on the market able to implement this process.

La principale machine est le métier fabriqué par la Société MALIMO, qui réalise des boucles maillées à partir d'une armure simple ou double tricot. La machine comporte une barre de lancettes fixe.The main machine is the loom manufactured by the MALIMO company, which produces mesh loops from single or double knit weave. The machine has a fixed lancet bar.

Il existe également des machines à crochets réalisant des boucles soit en trame, soit maillées, par insertion dans une feuille. Les lancettes sont toujours fixes.There are also hook machines making loops either in weft or mesh, by insertion in a sheet. Lancets are always fixed.

La fixité des lancettes a pour conséquence néfaste le fait que les boucles produites par ces procédés sont couchées sur la surface de leur support. La facilité d'accrochage des éléments complémentaires de la fermeture est donc naturellement diminuée par rapport au résultat que l'on pourrait attendre de l'emploi de boucles parfaitement droites. The fixity of the lancets has the harmful consequence the fact that the loops produced by these processes are lying on the surface of their support. Ease of attachment of the complementary elements of the closure is so naturally diminished compared to the result that we could expect the use of loops perfectly straight.

Il ressort donc de l'état de la technique tel que rappelé ci-dessus que des procédés de formation par tricotage de boucles sur une feuille sont connus, mais qu'il n'existe à ce jour aucun procédé simple et économique donnant toutes satisfactions. En particulier, les tissus à boucles produits par ces procédés ne présentent ni la stabilité dimensionnelle, ni les caractéristiques structurelles requises pour des utilisations très exigeantes, notamment pour les couches-culottes.It therefore appears from the state of the art such that recalled above that knitting training methods loops on a leaf are known, but there are no to date no simple and economical process giving all satisfaction. In particular, the loop fabrics produced by these processes exhibit neither stability dimensional nor structural characteristics required for very demanding uses, in particular for diapers.

DESCRIPTION GENERALE DE L'INVENTIONGENERAL DESCRIPTION OF THE INVENTION

La présente invention concerne donc un procédé de formation par tricotage de boucles sur un support, par exemple une feuille, visant à pallier les inconvénients des méthodes de fabrication antérieures.The present invention therefore relates to a method of formation by knitting loops on a support, by example a sheet, aimed at overcoming the disadvantages of previous manufacturing methods.

Elle a précisément pour objet un procédé de formation de boucles, faisant appel, en tant que moyens connus en soi, à une barre transversale d'aiguilles comportant chacune un fil de fermeture et un crochet, et à au moins une barre transversale de passettes. Ces barres sont situées de part et d'autre de ladite feuille, de façon conventionnelle. Une barre transversale de lancettes longitudinales en porte-à-faux est également utilisée.Its specific object is a method of looping, appealing, as a means known per se, to a crossbar of needles each comprising a closure wire and a hook, and at minus a crossbar of passettes. These bars are located on either side of said sheet, so conventional. A crossbar of lancets longitudinal cantilever is also used.

Dans ce procédé, la feuille est entraínée en continu d'amont en aval sur un métier, dont ces barres sont les principaux éléments constitutifs, notamment pour l'obtention d'un tissu à boucles constituant l'une des deux parties coopérantes d'une fermeture auto-agrippante.In this process, the sheet is driven in continuous from upstream to downstream on a loom, these bars of which are the main components, especially for obtaining a loop fabric constituting one of the two cooperating parts of a hook-and-loop closure.

De façon connue, les colonnes longitudinales de boucles sont réalisées d'un côté de la feuille en faisant passer les fils de tricotage amenés par les passettes sur les lancettes correspondantes, d'une part. D'autre part, les boucles sont retenues sur la feuille en faisant passer les fils de l'autre côté de la feuille.As is known, the longitudinal columns of loops are made on one side of the sheet by making pass the knitting threads brought by the passettes on the corresponding lancets, on the one hand. On the other hand, loops are retained on the sheet by passing the son on the other side of the sheet.

Suivant un procédé connu de formation par tricotage de boucles sur une feuille, après la formation d'au moins une première boucle sur une lancette, et avant et pour la formation d'une deuxième boucle sur cette lancette, on déplace transversalement dans un sens et d'une distance prédéterminée la lancette portant la première boucle, et, après la formation de la deuxième boucle sur cette lancette, on déplace à nouveau transversalement la lancette portant les première et deuxième boucles de la même distance et dans le sens inverse avant et pour la formation d'une troisième boucle sur cette lancette, le cycle de déplacement transversal de la lancette dans un sens puis dans l'autre se répétant toutes les deux boucles.According to a known method of training by knitting loops on a leaf, after at least one first loop on a lancet, and before and for the formation of a second loop on this lancet, we moves transversely in one direction and distance the lancet carrying the first loop, and, after the formation of the second loop on this lancet, the lancet carrying the first and second loops of the same distance and in the opposite before and for the formation of a third loop on this lancet, the displacement cycle transverse of the lancet in one direction then in the other repeating both loops.

Selon ce procédé, les lancettes sont situées contre le côté de la feuille faisant face aux passettes. Une variante se décompose en quatre étapes s'enchaínant cycliquement :

  • une première étape lors de laquelle, successivement, les aiguilles s'étant déplacées de la position basse vers la position arrière, l'abattage venant de s'effectuer, la feuille avance d'une maille, les lancettes se déplacent transversalement, et les passettes effectuent un premier déplacement latéral dans le sens inverse derrière les aiguilles,
  • une deuxième étape lors de laquelle, successivement, les aiguilles avancent vers les passettes, transpercent la feuille, passent à travers le peigne des lancettes, puis les passettes effectuent un premier déplacement longitudinal vers l'amont, suivi d'un second déplacement latéral d'un pas dans le premier sens,
  • une troisième étape lors de laquelle, successivement, les aiguilles commencent leur retour en position arrière, puis les passettes se placent sous les aiguilles par un second déplacement longitudinal vers l'aval, le second déplacement longitudinal ayant pour effet d'emprisonner chacun des fils dans le crochet, ensuite les fils de fermeture commencent à fermer les aiguilles,
  • une quatrième étape lors de laquelle, successivement, les fils de fermeture ayant fermé les aiguilles, celles-ci continuent leur retour arrière jusqu'au moment où, les fils passant à travers la feuille et réalisant les boucles sur ce premier côté, l'abattage est effectué, puis les aiguilles continuent vers leur position basse, enfin les fils de fermeture ouvrent lesdites aiguilles.
According to this method, the lancets are located against the side of the sheet facing the passettes. A variant is broken down into four stages which are linked cyclically:
  • a first step during which, successively, the needles having moved from the low position towards the rear position, the felling having just taken place, the sheet advances by one stitch, the lancets move transversely, and the passettes make a first lateral movement in the opposite direction behind the needles,
  • a second stage during which, successively, the needles advance towards the passettes, pierce the sheet, pass through the comb of the lancets, then the passettes carry out a first longitudinal displacement upstream, followed by a second lateral displacement of a step in the first direction,
  • a third step during which, successively, the needles begin their return to the rear position, then the passettes are placed under the needles by a second longitudinal displacement downstream, the second longitudinal displacement having the effect of trapping each of the threads the hook, then the closing threads start to close the needles,
  • a fourth step during which, successively, the closing threads having closed the needles, the latter continue their backward movement until the moment when the threads passing through the sheet and making the loops on this first side, the felling is carried out, then the needles continue towards their low position, finally the closing wires open said needles.

Selon ce procédé, on obtient d'un côté du tissu des boucles, en alternance orientées à gauche et à droite transversalement, et de l'autre côté du tissu (en bas, du côté des aiguilles) des mailles qui maintiennent les boucles en position à peu près verticales. Cependant, sur la totalité du fil utilisé, une grande partie (jusqu'à 50 %) est utilisée pour former les mailles, le reste servant pour les boucles.According to this process, one side of the fabric is obtained loops, alternately oriented left and right transversely, and on the other side of the fabric (below, side of the needles) stitches that hold the loops in approximately vertical position. However, out of all of the wire used, a large part (up to 50%) is used to form the stitches, the rest used for the loops.

Suivant l'invention, on inverse le rôle des mailles et des boucles. Une fois un tissu avec des boucles intermédiaires issues de la face supérieure et des mailles "cousues" dans la face inférieure du tissu obtenu, le procédé suivant l'invention prévoit une étape supplémentaire dans laquelle les mailles sont tirées vers le bas, de sorte que le fil sur la partie supérieure formant la boucle intermédiaire est plaqué contre le tissu et les fils de maille sont éloignées du tissu pour alors former une double boucle.According to the invention, the role of the meshes is reversed and curls. Once a fabric with loops intermediates from the upper side and meshes "sewn" into the underside of the fabric obtained, the process according to the invention provides an additional step in which the stitches are pulled down, so that the wire on the upper part forming the intermediate loop is pressed against the fabric and the mesh threads are away from the fabric to form a double loop.

Ainsi, on obtient beaucoup plus de boucles pour une même quantité de fils et beaucoup moins de fil est utilisé dans le simple but de maintien.So you get a lot more loops for a same amount of yarn and much less yarn is used for the simple purpose of maintenance.

Cela est obtenu par un procédé suivant l'invention, qui comporte les étapes qui consistent à

  • réaliser des colonnes longitudinales de boucles intermédiaires d'un côté du support et des colonnes de mailles de l'autre côté du support, en faisant passer le fil amené par des passettes se trouvant dudit un côté du support, à l'aide d'aiguilles, sur des lancettes se trouvant du même dit un côté du support,
  • retenir les boucles intermédiaires sur le support en faisant passer le fil de l'autre côté du support, après la formation d'au moins une première des boucles intermédiaires sur une des lancettes,
  • déplacer transversalement, dans un sens et d'une distance déterminée à l'avance la lancette portant la première boucle intermédiaire, en vue de la formation d'une deuxième boucle intermédiaire, et
  • après formation de la deuxième boucle intermédiaire sur la lancette, déplacer de nouveau transversalement la lancette portant les première et deuxième boucles intermédiaires de la même distance dans le sens opposé pour former une troisième boucle intermédiaire sur cette lancette, le cycle de déplacement transversal de la lancette dans un sens puis l'autre se répétant toutes les deux boucles intermédiaires, caractérisé en ce qu'il comporte en outre l'étape qui consiste à tirer les mailles intermédiaires en les éloignant du support pour ainsi former les boucles, les boucles intermédiaires étant alors plaquées contre le support pour former les tronçons de retenue.
This is obtained by a method according to the invention, which comprises the steps which consist in
  • make longitudinal columns of intermediate loops on one side of the support and mesh columns on the other side of the support, by passing the lead wire through passettes located on said one side of the support, using needles , on lancets located on the same side of the support,
  • retain the intermediate loops on the support by passing the wire on the other side of the support, after the formation of at least one of the first intermediate loops on one of the lancets,
  • displacing the lancet carrying the first intermediate loop transversely, in a direction and by a predetermined distance, with a view to forming a second intermediate loop, and
  • after forming the second intermediate loop on the lancet, move the lancet transversely again carrying the first and second intermediate loops by the same distance in the opposite direction to form a third intermediate loop on this lancet, the transverse movement cycle of the lancet in one direction then the other repeating each two intermediate loops, characterized in that it further comprises the step which consists in pulling the intermediate meshes away from the support so as to form the loops, the intermediate loops then being pressed against the support to form the retaining sections.

Suivant un perfectionnement de l'invention, on applique sur le support du côté des tronçons de retenue des moyens de collage des tronçons de retenue au support, notamment une couche de colle.According to an improvement of the invention, we applies to the support on the side of the retaining sections of means for bonding the retaining sections to the support, including a layer of glue.

Suivant un autre mode de réalisation de l'invention, un procédé suivant l'invention comporte les étapes qui consistent à :

  • réaliser des colonnes longitudinales de boucles d'un côté du support et des colonnes de tronçons de retenue de l'autre côté du support en faisant passer le fil amené par des passettes se trouvant dudit autre côté du support, à l'aide d'aiguilles, sur des lancettes se trouvant dudit un côté du support,
  • retenir les boucles sur le support en faisant passer le fil de l'autre côté du support, après la formation d'une première boucle sur une des lancettes,
  • déplacer transversalement dans un sens et d'une distance déterminée à l'avance la lancette portant la première boucle, en vue de la formation d'une deuxième boucles, et
  • après formation de la deuxième boucle sur la lancette, déplacer de nouveau transversalement la lancette portant les première et deuxième boucles de la même distance dans le sens opposé pour former une troisième boucle sur cette lancette, le cycle de déplacement transversal de la lancette dans un sens puis dans l'autre se répétant toutes les deux boucles.
According to another embodiment of the invention, a method according to the invention comprises the steps which consist in:
  • make longitudinal columns of loops on one side of the support and columns of retaining sections on the other side of the support by passing the lead wire through passettes located on the other side of the support, using needles , on lancets located on said one side of the support,
  • retain the loops on the support by passing the wire on the other side of the support, after the formation of a first loop on one of the lancets,
  • displacing the lancet carrying the first loop transversely in a direction and by a predetermined distance, with a view to forming a second loop, and
  • after forming the second loop on the lancet, move the lancet carrying the first and second loops the same distance in the opposite direction again transversely to form a third loop on this lancet, the cycle of transverse displacement of the lancet in one direction then in the other repeating each two loops.

Dans cette variante de l'invention la formation des boucles sur la face inférieure du tissu est réalisée directement par le positionnement côté aiguille des lancettes et le tirage des boucles finales vers le bas s'effectue directement par les aiguilles.In this variant of the invention the formation of loops on the underside of the fabric is made directly by the needle side positioning of the lancets and the final loops are pulled down directly by the needles.

Suivant un perfectionnement de l'invention, le procédé comprend

  • une première étape lors de laquelle, successivement, lesdites aiguilles s'étant déplacées de la position basse vers la position arrière, l'abattage venant de s'effectuer, le support avance d'une maille, lesdites lancettes se déplacent transversalement, et lesdites passettes effectuent un premier déplacement latéral dans ledit sens inverse derrière lesdites aiguilles,
  • une deuxième étape lors de laquelle, successivement, lesdites aiguilles avancent vers lesdites passettes, transpercent le support, passent à travers le peigne des lancettes, puis lesdites passettes effectuent un premier déplacement longitudinal vers ledit amont, suivi d'un second déplacement latéral d'un pas dans ledit sens,
  • une troisième étape lors de laquelle, successivement, lesdites aiguilles commencent leur retour en position arrière, puis lesdites passettes se placent sous lesdites aiguilles par un second déplacement longitudinal vers ledit aval, ledit second déplacement longitudinal ayant pour effet d'emprisonner chacun desdits fils dans ledit crochet, ensuite lesdits fils de fermeture commencent à fermer lesdites aiguilles,
  • une quatrième étape lors de laquelle, successivement, lesdits fils de fermeture ayant fermé lesdites aiguilles, lesdites aiguilles continuent leur retour arrière jusqu'au moment où, lesdits fils passant à travers le support et réalisant lesdites boucles sur ledit premier côté, l'abattage est effectué, puis lesdites aiguilles continuent vers leur position basse, enfin lesdits fils de fermeture ouvrent lesdites aiguilles,
   lesdites première, seconde, troisième et quatrième étapes étant enchaínées cycliquement.According to an improvement of the invention, the method comprises
  • a first step during which, successively, said needles having moved from the low position towards the rear position, the felling having just taken place, the support advances by one mesh, said lancets move transversely, and said passettes carry out a first lateral movement in said opposite direction behind said needles,
  • a second step during which, successively, said needles advance towards said passettes, pierce the support, pass through the comb of the lancets, then said passettes carry out a first longitudinal movement towards said upstream, followed by a second lateral movement of a not in that sense,
  • a third step during which, successively, said needles begin their return to the rear position, then said passettes are placed under said needles by a second longitudinal movement towards said downstream, said second longitudinal movement having the effect of trapping each of said threads in said hook, then said closure threads begin to close said needles,
  • a fourth step during which, successively, said closure threads having closed said needles, said needles continue their backward movement until the moment when said threads passing through the support and producing said loops on said first side, the felling is carried out, then said needles continue towards their low position, finally said closing wires open said needles,
said first, second, third and fourth steps being linked cyclically.

On obtient ainsi un maintien particulièrement bon des boucles du tissu.This gives particularly good support fabric loops.

Suivant un perfectionnement de l'invention, les impacts des aiguilles sur le support s'effectuent en zig-zag. On obtient ainsi un maintien meilleur des boucles sur le support.According to an improvement of the invention, the impacts of the needles on the support are effected in a zigzag. This provides better retention of the loops on the support.

DE 1267372 décrit un tissu à boucle suivant le préambule de la revendication 1. Ce système présente une configuration compliquée du réseau de tronçon de retenue, ce qui en ralentit le tricotage. En outre, les boucles y sont mal retenues.DE 1267372 describes a loop fabric according to the preamble to claim 1. This system has a complicated configuration of the retaining section network, this which slows down knitting. In addition, the loops are there poorly retained.

La présente invention vise également un tissu à boucles suivant la revendication 1.The present invention also relates to a fabric with loops according to claim 1.

Suivant l'invention, la grande majorité du fil sert à former les boucles, ce qui est particulièrement avantageux dans le cas d'une partie femelle d'un élément auto-agrippant où l'on souhaite que le fil serve surtout à former les boucles, qui sont les éléments actifs de cette partie femelle.According to the invention, the vast majority of the wire used to form the loops, which is particularly advantageous in the case of a female part of an element Velcro where you want the thread to be used mainly for form the loops, which are the active elements of this female part.

Suivant un perfectionnement de l'invention, chaque tronçon de retenu est entièrement en contact avec le support. La longueur de fil utilisée pour former les tronçons de retenue est ainsi minimale.According to an improvement of the invention, each section of retainer is fully in contact with the support. The length of wire used to form the sections of restraint is thus minimal.

Suivant encore un perfectionnement de l'invention, chaque tronçon de boucle est constitué d'une boucle double.According to a further improvement of the invention, each loop section consists of a double loop.

Le tissu à boucles suivant l'invention présent ainsi très avantageusement des colonnes de boucles, formées par les mailles des tissus de l'art antérieur, comportant une boucle double par pas, dont les pieds sont sensiblement perpendiculaires à la feuille.The loop fabric according to the present invention thus very advantageously columns of loops, formed by the meshes of the fabrics of the prior art, comprising a double loop per step, the feet of which are substantially perpendicular to the sheet.

Les fils constituant les boucles sont préférentiellement des fils de polyamide ou de polyester, tandis que la feuille, ou support, est préférentiellement constituée par un film ou un non-tissé de polyester, polyéthylène ou polypropylène d'un grammage compris entre 15 et 20 g/m2.The wires making up the loops are preferably polyamide or polyester yarns, while the sheet, or support, is preferably consisting of a polyester film or nonwoven, polyethylene or polypropylene with a grammage between 15 and 20 g / m2.

Une utilisation caractéristique du tissu à boucles réalisé par le procédé selon l'invention est la fabrication d'articles comportant des parties de fermetures auto-agrippantes avantageusement intégralement constitutives de ces articles au lieu d'être rapportées, notamment des couches-culottes. Typical use of loop fabric achieved by the process according to the invention is the manufacture of articles having parts of hook-and-loop fasteners advantageously fully constitutive of these articles instead of being reported, including diapers.

On comprendra bien l'invention à la lecture de la description qui va suivre et en référence aux dessins annexés qui font partie de la description et dans lesquels :The invention will be clearly understood on reading the description which follows and with reference to the accompanying drawings which are part of the description and in which:

Figures 1a, 1b, 1c et 1d sont les vues schématiques d'un métier, propre à mettre en oeuvre le procédé, montrant les quatre étapes essentielles de la première variante du procédé de formation par tricotage de boucles sur une feuille selon l'invention.Figures 1a, 1b, 1c and 1d are the schematic views of a trade, suitable for implementing the process, showing the four essential stages of the first variant of the method of forming loops on a sheet by knitting according to the invention.

Figures 2a, 2b, 2c et 2d sont les vues schématiques d'un métier, propre à mettre en oeuvre le procédé, montrant les quatre étapes essentielles de la seconde variante du procédé de formation par tricotage de boucles sur une feuille selon l'invention.Figures 2a, 2b, 2c and 2d are the schematic views of a trade, suitable for implementing the process, showing the four essential stages of the second variant of the method of forming loops on a sheet by knitting according to the invention.

Figure 3a est une vue de dessus schématique (côté chaínette) d'un tissu réalisé suivant l'art antérieur.Figure 3a is a schematic top view (side chain) of a fabric produced according to the prior art.

Figure 3b est une vue de dessus schématique (côté boucsle) d'un tissu réalisé par le procédé selon l'invention.Figure 3b is a schematic top view (side boucsle) of a fabric produced by the method according to the invention.

Figure 4 est une vue de dessus schématique d'un autre tissu suivant l'invention.Figure 4 is a schematic top view of a other fabric according to the invention.

DESCRIPTION D'UNE FORME D'EXECUTION PREFEREE DE L'INVENTIONDESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION

Les références aux Figures 1a, 1b, 1c et 1d, ainsi qu'aux Figures 2a, 2b, 2c et 2d serviront à expliquer les différentes étapes caractéristiques des deux variantes du procédé de formation de boucles sur une feuille selon l'invention.References to Figures 1a, 1b, 1c and 1d, as well that in Figures 2a, 2b, 2c and 2d will be used to explain the different stages characteristic of the two variants of the method of forming loops on a sheet according to the invention.

Les différentes références montrent les éléments mécaniques, pour la plupart connus, d'un métier du type de ceux construits par la société LIBA. Les vues, très stylisées et sans indication des coupes dans un but de simplicité, sont celles de ces éléments vus à partir d'un plan vertical compris entre deux colonnes de boucles.The different references show the elements mechanical, mostly known, of a trade of the type those built by the company LIBA. The views, very stylized and without indication of the cuts for the sake of simplicity, are those of these elements seen from a vertical plane between two columns of loops.

Selon une représentation conventionnelle, la feuille (2) est représentée verticalement et les boucles (1) qui y sont insérées, horizontalement, alors que dans la réalité les aiguilles (3) sont le plus souvent verticales et en bas. Les dispositifs de manoeuvre des fils de fermeture (4) sont aussi en réalité en bas, et se déplacent donc de bas en haut pour fermer l'aiguille (3) au niveau du crochet (5), et de haut en bas pour l'ouvrir. Les aiguilles sont portées par une barre horizontale transversale, dont la section n'est pas indiquée en tant que telle. Il en est de même pour la barre horizontale et transversale supportant les passettes (6), ainsi que pour la barre de lancettes (7). Le fil (8) est amené sur la passette (6) pour former les boucles (1) sur la lancette (7) qui seront fixées sur la feuille (2) par l'aiguille (3).According to a conventional representation, the sheet (2) is shown vertically and the loops (1) inserted horizontally, while in the in reality the needles (3) are most often vertical and below. Closing wire operating devices (4) are also actually at the bottom, and therefore move from below at the top to close the needle (3) at the hook (5), and up and down to open it. The needles are worn by a horizontal transverse bar, the cross section of which is not indicated as such. It is the same for the horizontal and transverse bar supporting the passettes (6), as well as for the lancet bar (7). The wire (8) is brought on the passette (6) to form the loops (1) on the lancet (7) which will be fixed on the sheet (2) by the needle (3).

Le métier représenté est un métier fonctionnant en continu : les boucles (1) sont tricotées sur la feuille (2) qui se déplace de l'amont vers l'aval (respectivement de haut en bas sur les figures).The profession represented is a profession operating in continuous: the loops (1) are knitted on the sheet (2) which moves from upstream to downstream (respectively from high below in the figures).

Certaines machines textiles comportent des barres de passettes (6) supplémentaires dans le but de mieux contrôler le mouvement des fils (8). Elles ne seront pas représentées ici, par souci de ne pas compliquer l'exposé du procédé de tricotage de boucles sur une feuille (2) selon l'invention.Some textile machines have bars additional passettes (6) in order to better check the movement of the wires (8). They will not represented here, for the sake of not complicating the presentation of the method of knitting loops on a sheet (2) according to the invention.

La référence (7) sur les Figures 1a, 1b, 1c et 1d montre que les lancettes sont situées contre la feuille (2), du côté faisant face aux passettes (6). Cela correspond à l'une des deux configurations possibles convenant à la mise en oeuvre du procédé, et constitue la première variante.The reference (7) in Figures 1a, 1b, 1c and 1d shows that the lancets are located against the sheet (2), on the side facing the passettes (6). This corresponds to one of the two possible configurations suitable for placing implementation of the method, and constitutes the first variant.

Cette position aiguille-feuille-lancette-passette est classique chez les constructeurs. Les boucles sont alors, de manière connue, réalisées en position jetée sous l'aiguille.This needle-leaf-lancet-passette position is classic among manufacturers. The loops are then, in known manner, carried out in the discarded position under the needle.

Selon la première variante du procédé selon l'invention, dont les différentes étapes sont décrites ci-après, les boucles (1) sont réalisées sur une chaínette (du côté opposé aux aiguilles (3)), sans jeté, par déplacement des lancettes (7).According to the first variant of the method according to the invention, the various stages of which are described below, the loops (1) are made on a chain (from side opposite needles (3)), without throw, by displacement lancets (7).

La Figure la montre la première étape du cycle de tricotage. L'aiguille (3) est en position basse (ou arrière). Le fil (8) a été tiré au travers de la feuille (2) par le crochet (5) de l'aiguille (abattage). Le fil de fermeture (4) a libéré l'aiguille (3).Figure la shows the first stage of the knitting. The needle (3) is in the low (or rear) position. The wire (8) was pulled through the sheet (2) by the needle hook (5) (felling). The closure wire (4) released the needle (3).

Dans cette étape la feuille (2) avance d'une maille et la lancette (7) se déplace latéralement d'une aiguille (ou de plusieurs) à droite (9) (au prochain cycle, la lancette se déplacera à gauche (10)).In this step the leaf (2) advances by one stitch and the lancet (7) moves laterally by a needle (or several) to the right (9) (in the next cycle, the lancet will will move left (10)).

Afin de créer une boucle (1) de ce premier côté (11) de la feuille (2), les passettes effectuent un déplacement latéral à gauche (12) pour enrouler le fil (8) sur la lancette (7), sous l'aiguille (3) (jeté sous).In order to create a loop (1) on this first side (11) of the sheet (2), the passettes perform a lateral movement to the left (12) to wind the wire (8) on the lancet (7), under the needle (3) (thrown under).

A l'étape suivante, schématisée sur la Figure 1b, l'aiguille (3) avance vers la passette (6) et traverse la feuille (2). En effectuant un déplacement longitudinal vers l'amont (13) (haut) et un déplacement latéral à droite (14) de l'intervalle d'une aiguille, la passette (6) passe par dessus l'aiguille (3). Elle se trouve alors en position pour engager le fil (8) dans le crochet (5) (jeté sur) à l'étape qui suit, représentée sur la Figure 1c.In the next step, shown schematically in Figure 1b, the needle (3) advances towards the passette (6) and crosses the sheet (2). By making a longitudinal movement towards upstream (13) (top) and lateral displacement to the right (14) the interval of a needle, the passette (6) passes through above the needle (3). It is then in position to engage the wire (8) in the hook (5) (thrown on) in step which follows, shown in Figure 1c.

Lors de cette étape, l'aiguille (3) commence son retour arrière (ou descente), tandis que la passette (6) se déplace vers l'aval (15) en se plaçant sous l'aiguille (3). Ceci a pour effet d'emprisonner le fil (8) dans l'aiguille (3), le fil de fermeture (4) commençant à fermer celle-ci.During this step, the needle (3) begins its reverse (or descent), while the passette (6) is moves downstream (15) by placing itself under the needle (3). This has the effect of trapping the thread (8) in the needle (3), the closure wire (4) starting to close the latter.

L'étape représentée sur la Figure 1d termine le cycle. Le fil de fermeture (4) a fermé l'aiguille (3). L'aiguille (3) continue son retour arrière (ou descente) en entraínant le fil (8) au travers de la maille précédente sur le second côté de la feuille (2) (abattage). La boucle (2) est ainsi fixée sur le premier côté (11), et l'aiguille (3) continue vers sa position basse. Le fil de fermeture (4) ouvre l'aiguille et le cycle recommence.The step shown in Figure 1d completes the cycle. The closing thread (4) closed the needle (3). The needle (3) continues its reverse (or descent) in driving the wire (8) through the previous stitch on the second side of the leaf (2) (felling). The loop (2) is thus fixed on the first side (11), and the needle (3) continues to its lower position. The closure wire (4) opens the needle and the cycle begins again.

Une seule boucle (1), alignée sur l'axe de la colonne de boucles, est formée à chaque cycle.A single loop (1), aligned on the axis of the column of loops, is formed in each cycle.

Si la première variante du procédé s'appuyait sur une configuration matérielle classique, en revanche, la lancette (7) du second côté (16) de la feuille (2), c'est-à-dire du côté faisant face à l'aiguille, comme on le voit sur les Figures 2a, 2b, 2c et 2d, est une position inhabituelle pour les constructeurs.If the first variant of the process was based on a conventional hardware configuration, however, the lancet (7) on the second side (16) of the sheet (2), that is to say on the side facing the needle, as seen on Figures 2a, 2b, 2c and 2d, is an unusual position for builders.

Dans cette position aiguille-lancette-feuille-passette, la boucle se réalise par la maille et est provoquée uniquement par le déplacement latéral (9,10) de la lancette (7). In this needle-lancet-leaf-passette position, the loop is achieved by the mesh and is caused only by lateral displacement (9,10) of the lancet (7).

Les quatre étapes de la seconde variante du procédé de formation par tricotage de boucles (1) sur une feuille (2) selon l'invention sont similaires à celles exposées ci-dessus, relatives à la première variante.The four stages of the second variant of the process for training by knitting loops (1) on a sheet (2) according to the invention are similar to those set out above, relating to the first variant.

Il va de soi que, au cours de la quatrième étape du cycle, représentée sur la Figure 2d, la boucle n'est pas fixée sur le premier côté (11) de la feuille (2), face aux lancettes (7): dans ce cas, le fil (8), tiré par l'aiguille (3), fixe en réalité la boucle (1), formée au cycle précédent, sur le second côté (16), face à l'aiguille (3).It goes without saying that during the fourth stage of the cycle, shown in Figure 2d, the loop is not fixed on the first side (11) of the sheet (2), facing the lancets (7): in this case, the thread (8), pulled by the needle (3), actually fixes the loop (1), formed on the cycle previous, on the second side (16), facing the needle (3).

Il y a alors, évidemment, deux fils par maille constituant une boucle double (1), dont les deux anses sont sensiblement réparties symétriquement par rapport à un plan vertical passant par la ligne de piqûre.There are then, obviously, two threads per mesh constituting a double loop (1), the two handles of which are substantially distributed symmetrically with respect to a plane vertical passing through the stitch line.

Les caractéristiques détaillées du tissu obtenu par ces deux variantes du procédé seront décrites en liaison avec les Figures 3a et 3b.The detailed characteristics of the fabric obtained by these two variants of the process will be described in conjunction with Figures 3a and 3b.

Pour compléter la présentation des deux variantes du procédé, mais sans que cela en constitue une caractéristique essentielle, on notera, comme les représentent les Figures 1a, 1b, 1c et 1d et les Figures 2a, 2b, 2c et 2d, que la platine d'abattage (17) et la platine anti-remontée aval (18) ont été conservées. Dans le cas de la seconde variante, on remarquera la mise en oeuvre d'une platine anti-remontée amont (19), rendue possible par la position de la barre de lancettes (7) de l'autre côté (16) de la feuille (2).To complete the presentation of the two variants of the process, but without that constituting one essential characteristic, we note, as the represent Figures 1a, 1b, 1c and 1d and Figures 2a, 2b, 2c and 2d, that the felling plate (17) and the plate downstream anti-lift (18) have been retained. In the case of second variant, note the implementation of a upstream anti-lift plate (19), made possible by the position of the lancet bar (7) on the other side (16) of the sheet (2).

La Figure 3a montre schématiquement le tissu réalisé par le procédé de l'art antérieur.Figure 3a shows schematically the tissue produced by the method of the prior art.

Les intersections de la grille (G) représentent l'impact de l'aiguille (3) à travers la feuille (2). Les boucles (1) sont représentées en gras, vues de dessus (côté chaíne). Les pointillés représentent les fils (8) sous la feuille (2) (côté maille).The grid intersections (G) represent the impact of the needle (3) through the sheet (2). The loops (1) are shown in bold, viewed from above (side chain). The dotted lines represent the wires (8) under the sheet (2) (mesh side).

Dans le sens longitudinal (de l'amont vers l'aval), les points d'impacts sont séparés par une distance (Py), c'est-à-dire le pas des aiguilles (3). In the longitudinal direction (from upstream to downstream), the impact points are separated by a distance (Py), that is to say the pitch of the needles (3).

Dans le sens transversal, les piqûres sont distantes d'une distance prédéterminée (Px). Cette distance est au moins égale à un pas d'aiguille.In the transverse direction, the punctures are distant from a predetermined distance (Px). This distance is at least equal to one needle pitch.

Le procédé permet de produire des boucles (1) dont les pieds (20) sont constitués par des fils (8) émergeant sensiblement perpendiculairement des perforations du support (2).The method makes it possible to produce loops (1) of which the feet (20) are constituted by wires (8) emerging substantially perpendicular to the perforations of the support (2).

Le procédé suivant l'invention permet de confectionner un tissu à boucles représenté schématiquement Figure 3b. Les boucles (1) sont représentées en gras, vues de dessous (côté maille). Les pointillés représentent les fils (8) sur la feuille (2) (côté chaíne). Les boucles (1) formées sont des boucles doubles, dont les pieds (21), en aval, émergent des piqûres sensiblement perpendiculairement à la feuille (2), et, en amont, sont fixés par la boucle suivante de façon pratiquement orthogonale au support (2).The process according to the invention makes it possible to make a loop fabric shown diagrammatically Figure 3b. The loops (1) are shown in bold, seen from below (mesh side). The dotted lines represent the wires (8) on the sheet (2) (chain side). The loops (1) formed are double loops, the feet (21) of which are downstream, bites emerge substantially perpendicular to the sheet (2), and, upstream, are fixed by the following loop practically orthogonal to the support (2).

Près de 80 % du fil sert à former les boucles, et seul 20 % du fil sert à maintenir les boucles.Nearly 80% of the wire is used to form the loops, and only 20% of the wire is used to hold the curls.

Suivant la dimension souhaitée des boucles et des tronçons de support, ce pourcentage peut être compris entre 60 % et 90 %.Depending on the desired size of the loops and support sections, this percentage can be between 60% and 90%.

Les boucles (1) ne sont pas parfaitement droites. Elles subissent une orientation différente, mais sans commune mesure avec les articles réalisés par les procédés de formation par tricotage sur une feuille de l'art antérieur.The loops (1) are not perfectly straight. They undergo a different orientation, but without common measurement with the articles produced by the formation by knitting on a sheet of the prior art.

Un mode de réalisation préférentiel du tissu produit par le procédé selon l'invention est un tissu constitué d'un film (2) ou d'un non-tissé (2) de polyester, polyéthylène ou polypropylène avec des boucles (1) en fil (8) de polyamide ou polyester.A preferred embodiment of the fabric produced by the process according to the invention is a fabric made of a polyester film (2) or nonwoven (2), polyethylene or polypropylene with wire loops (1) (8) polyamide or polyester.

Selon l'usage qui sera réservé au tissu ainsi fabriqué, le grammage de la feuille (1) sera de préférence compris entre 15 et 20 g/m2.Depending on the use that will be reserved for the fabric as well manufactured, the grammage of the sheet (1) should preferably be between 15 and 20 g / m2.

L'homme de métier pourra envisager facilement de nombreuses utilisations du tissu à boucles confectionné par le procédé selon l'invention. En particulier, le tissu fabriqué dans certaines circonstances, ne comporte pas de boucles sur toute sa surface. Seules des parties déterminées, adaptées à l'article final qui sera manufacturé, sont munies de boucles (1).A person skilled in the art can easily envisage many uses for the loop fabric made by the method according to the invention. In particular, the fabric manufactured in certain circumstances, does not contain loops over its entire surface. Only specific parts, adapted to the final article to be manufactured, are provided loops (1).

En coopération avec les parties complémentaires, comportant par exemple des crochets, l'avantage des boucles faisant intégralement partie de l'article sera une plus grande résistance à l'arrachement par comparaison à des boucles fixées sur un support rapporté sur la pièce.In cooperation with the complementary parties, with hooks for example, the advantage of loops being an integral part of the article will be a plus high pull-out resistance compared to loops fixed on a support attached to the part.

Le procédé selon l'invention est donc particulièrement adapté à la fabrication d'articles pour lesquelles les spécifications des fermetures de type auto-agrippante sont particulièrement sévères, notamment les couches-culottes.The method according to the invention is therefore particularly suitable for the manufacture of articles for which the specifications of hook-and-loop closures are particularly severe, especially diapers.

Bien entendu, l'invention n'est pas limitée aux modes de mise en oeuvre, non plus qu'au mode d'application, qui ont été décrits. On pourrait au contraire concevoir diverses variantes sans sortir pour autant de son cadre.Of course, the invention is not limited to modes of implementation, no more than the mode of application, that have been described. On the contrary, we could conceive various variants without departing from its scope.

A la figure 4, il est représenté un tissu suivant un mode de réalisation autre que celui de la figure 3b. Les boucles doubles sont réalisées en zigzag, cela étant dû à une attaque en zigzag des aiguilles dans le support. On obtient ainsi des boucles doubles mieux tenues.In Figure 4, there is shown a following fabric an embodiment other than that of FIG. 3b. The double loops are zigzag, this being due to a zigzag attack on the needles in the holder. We obtain thus better held double loops.

Claims (9)

  1. Loop cloth including a textile film (2) and at least one string (8), the string defining loop sections on one side of the film and restraining sections on the other side, the length of a restraining section being less that the length of a loop section, characterized in that each loop section extends itself between a first extremity and a second extremity, and a restraining section corresponds to a loop section and extends itself between said first and second extremity of the loop section.
  2. Loop cloth following claim 1, characterized in that restraining sections are entirely in contact against the support.
  3. Loop cloth following claims 1 and 2, characterized in that each loop section constitutes of a double loop.
  4. Loop cloth following claim 3, characterized in that the feet (21) of a double loop are sensibly perpendicular to the support (2).
  5. The process of creating loops on a cloth by knitting following any one of the above claims, including the following steps:
    to realize longitudinal columns of intermediary loops on one side of the support (2), and columns of stitches on the other side of the support (2), by driving a string (8) brought by small strainers (6) on the one side of said support (2), with needles (3), onto lancets which are on the same side of said support (2);
    to retain the intermediary loops on the support (2) by driving the string (8) on the other side of the support (2), after the creation of at least the first of the intermediary loops on one of the lancets;
    to move transversally (9), in one direction and by a pre-determined distance the lancet (7) holding the first intermediary loop, with a view to create a second intermediary loop; and
    after the creation of the second intermediary loop on the lancet (7), to again move the lancet (7) holding both the first and second intermediary loops transversally (10), by the same distance but in the opposite direction, so as to create a third intermediary loop on this lancet. The cycle of transversal movement (9, 10) of the lancet (7) in one direction then the other is repeating every two intermediary loops, characterized in that it includes a further step consisting of pulling the intermediary stitches away from the support (2) to create the loops (1). The intermediary loops being therefore pressed against the support (2) to create the retaining sections.
  6. The process of creating loops on a cloth by knitting following one of claims 1 to 4, including the following steps:
    realizing longitudinal columns of loops on one side of the support (2), and columns of retaining sections on the other side of the support (2), by driving a string (8) brought by small strainers (6) on the other side of said support, with needles, onto lancets which are on the one side of said support (2);
    retaining the loops on the support (2) by driving the string (8) on the other side of the support (2), after the creation of at least the first of the loops on one of the lancets;
    moving transversally (9), in one direction and by a pre-determined distance the lancet (7) holding the first loop, with a view to create a second loop; and
    after the creation of the second loop on the lancet, to again move the lancet (7) holding both the first and second loops transversally (10), by the same distance but in the opposite direction, so as to create a third loop on this lancet. The cycle of transversal movement (9,10) of the lancet in one direction then the other is repeating every two loops.
  7. The process following either claim 5 or claim 6, characterized in that compounds to glue the retaining sections to the support are applied on the support (2) on the side of the retaining sections, notably a layer of glue.
  8. The process of creating loops (1) on a cloth (2) by knitting following either claim 5, 6 or 7, characterized in that it includes:
    a first step during which, successively, said needles (3) having moved from the lower position to the back position, the felling having just completed, the support (2) advances by one stitch, said lancets (7) move transversally (9,10) and said small strainers (6) accomplish a first lateral movement (12) in the said opposite direction behind said needles,
    a second step during which, successively, said needles (3) move towards said small strainers (6), punch through the support (2), move through the comb of the lancets (7), then said small strainers (6) accomplish a first longitudinal movement towards said top (13), followed by a second lateral movement (14) of a step towards the said initial direction,
    a third step during which, successively, said needles (3) begin their return to the back position, then said small strainers (6) move under said needles (3) by a second longitudinal movement (15) towards said bottom, said second longitudinal movement (15) having for effect to snare each of said strings (8) in said hook (5), then said closing strings (4) begin to close said needles (3),
    a fourth step during which, successively, said closing strings (4) having closed said needles (3), said needles (3) carry on their return to the back position until the moment when, said strings (8) moving through the support (2) and forming said loops (2) on said first side (11), the fell' is
    a fourth step during which, successively, said closing strings (4) having closed said needles (3), said needles (3) carry on their return to the back position until the moment when, said strings (8) moving through the support (2) and forming said loops (2) on said first side (11), the fell1 is completed. Said needles (3) carry on towards the lower position and finally said closing strings (4) open said needles (3).
       said first, second, third and fourth steps taking place in a cyclical fashion.
  9. A diaper including a cloth according to one of claims 1 to 4, the cloth being fixed on to the diaper.
EP99401676A 1998-07-08 1999-07-05 Method for making pile loops on a web by knitting, pile loop fabric made according to his method, and its application Expired - Lifetime EP0971060B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9808739 1998-07-08
FR9808739A FR2780989B1 (en) 1998-07-08 1998-07-08 METHOD OF FORMING BY KNITTING LOOPS ON A SHEET, LOOP FABRIC REALIZED ACCORDING TO THIS METHOD, AND ITS USE

Publications (2)

Publication Number Publication Date
EP0971060A1 EP0971060A1 (en) 2000-01-12
EP0971060B1 true EP0971060B1 (en) 2003-10-08

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EP99401676A Expired - Lifetime EP0971060B1 (en) 1998-07-08 1999-07-05 Method for making pile loops on a web by knitting, pile loop fabric made according to his method, and its application

Country Status (6)

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US (1) US6209359B1 (en)
EP (1) EP0971060B1 (en)
JP (1) JP2000070011A (en)
DE (1) DE69911857T2 (en)
ES (1) ES2209355T3 (en)
FR (1) FR2780989B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6367291B2 (en) * 1997-10-22 2002-04-09 Milliken & Company Hook and loop fastening structure
DE202006002210U1 (en) * 2006-02-11 2007-06-21 Coroplast Fritz Müller Gmbh & Co. Kg Self-windable adhesive tape with textile backing
ITMI20100223A1 (en) 2010-02-15 2011-08-16 Velcro Ind FIXING ARTICLE, PROCEDURE FOR THE REALIZATION OF SUCH ITEM AND EQUIPMENT FOR THE PURPOSE OF SUCH PROCEDURE
TWI457088B (en) * 2010-10-26 2014-10-21 Taiwan Paiho Ltd Velcro with hair surface manufacturing methods, manufacturing equipment and velcro hair surface
JP6564356B2 (en) * 2016-11-25 2019-08-21 大王製紙株式会社 Tape type disposable diaper

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US2890579A (en) * 1954-04-19 1959-06-16 Tullmaschb Veb Textile material and manufacture
DE1585449A1 (en) * 1963-10-12 1969-10-30 Naehwirkmaschb Malimo Karl Mar Warp knitting machine, such as sewing machine or the like. for the production of plush goods
DE1267372B (en) * 1964-10-02 1968-05-02 Naehwirkmaschb Malimo Karl Mar Method for producing a pile fabric
US3540238A (en) * 1967-12-13 1970-11-17 Burlington Industries Inc Warp knit fabric and method and apparatus for making the same
US3452561A (en) * 1968-01-29 1969-07-01 Burlington Industries Inc Novelty yarns as sewing threads in stitch bonded fabrics
US3611754A (en) * 1969-06-02 1971-10-12 Nahwirkmaschinenbau Malimo Kar Textile material and manufacture
DD96994A1 (en) * 1972-01-24 1973-04-12
DE2435312C2 (en) * 1974-07-23 1976-09-09 Liba Maschf Warp knitting machine for the production of pile fabric
US4931343A (en) * 1985-07-31 1990-06-05 Minnesota Mining And Manufacturing Company Sheet material used to form portions of fasteners
DE4114012C3 (en) * 1991-04-29 1996-07-04 Liba Maschf Warp knitting machine with individually movable thread guides attached to a bar
JP2867113B2 (en) * 1994-07-25 1999-03-08 大和紡績株式会社 Hook fastener female material

Also Published As

Publication number Publication date
FR2780989A1 (en) 2000-01-14
FR2780989B1 (en) 2000-12-22
ES2209355T3 (en) 2004-06-16
EP0971060A1 (en) 2000-01-12
US6209359B1 (en) 2001-04-03
DE69911857D1 (en) 2003-11-13
DE69911857T2 (en) 2004-07-22
JP2000070011A (en) 2000-03-07

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