FR2492418A1 - THERMOCOLATING ELASTIC WIRE - Google Patents

Abstract

ELASTIC THREAD. THE THERMO-ADHESIVE ELASTIC THREAD INCLUDES AN ELASTIC ELASTIC 1 ELEMENT WHICH IS ASSOCIATED AT LEAST WITH ANOTHER ELASTIC ELEMENT 2 CARRYING A THERMOSTICAL PRODUCT. APPLICATION TO BABY DIAPERS.

Description

The present invention relates to elastic yarns for

  be reported on flexible media, so that

  to perform a raking, at least local, of these.

  The technical field concerned is, more particularly,

  but not exclusively, that of clothing in the general sense, that is to say including all the elements that can be considered

  as contributing to the protection, beautification, cov-

  of all or part of the human body, that these elements

  In the technical field above, it is known to produce garments possessing, either locally or at the edges, collapsible areas which can be deformed in a glastic manner and which contribute to establishing an adequate support on the body but which is not binding on the body. topic. Until now it was known to make kinds of hems or loops in which were introduced elastic threads stitched under tension, so that after the release of the latter a gathering appears. Another known method also consists in weaving, at least locally with the constituent yarns of the garment, an elastic thread which is tensioned so as to produce, after loosening, a frown

  perpendicular to the alignment of the elastic thread.

  The methods above have certain advantages

  but are practically useless when the element

  the clothing of the garment is formed by a sheet, strip or sheet of woven or non-woven synthetic material, such methods are also not appropriate in the case of mass production of articles, because they do not allow production rates

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  high. In the cases above, it has been proposed to replace

  known solutions by the establishment of a band Elastic cons-

  tituee by a flat thread which is attached by gluing on the support to receive it.

  The known manufacturing technique in this field

  is to ensure the unfolding of a tensioned flat wire and

  on which are deposited points of glue. A subsequent operation

  quente then realizes the application of the wire on the support and the

  maintaining contact with the application of pressure and time

  temperature to achieve the polymerization of the glue.

  Such a manufacturing technique does not lend itself

  suitable for mass production because it is necessary to

  to introduce a relatively complex installation of unwinding of the elastic flat wire,

  the last one and remove glue points through

  small jets to prevent spinning or casting

of the latter.

  In addition to the high cost of these installations, it should be noted that their complexity requires a delicate maintenance that often disrupts the mass production line.

articles of mass circulation.

  The present invention aims to solve the problem

  above by proposing a new elastic yarn presenting the partic-

  the importance of carrying, itself, the means of connection with a support

  whatever, so that the connection of the two elements can inter-

  come easily and at high speed of scrolling, even in installations or catches manufacturing in very large series, without requiring important ancillary equipment, a high cost

  and a delicate and complex interview.

  An object of the invention is to provide an elastic thread that allows a significant saving of glue used, as well as a

  significant increase in production rates.

  Another object of the invention is to provide an elastic yarn which is of a lower cost price than that of

current elastic bands.

  To achieve the above goals, in accordance with the

  The fusible elastic yarn is characterized in that it comprises an elastic elongated member which is associated with at least one other elongated element with which it forms an elastically elastic complex, said second element being locally at least

carrier of a fusible product.

  Various other features of the invention are

  detailed description given below with reference to the

  drawings which show, by way of non-limiting examples,

  two embodiments of the subject of the invention.

  Fig. I is a partial view of an elastic thread con-

  form the invention in a power-on state.

  Fig. 2 is a view similar to FIG. 1 illustrating

an alternative embodiment.

  Figures 3 and 4 are partial elevations showing

  two other embodiments of the subject of the invention.

  Fig. 1 shows that, according to the first form of

  As illustrated, the yarn according to the invention comprises an elastic core I of any suitable material, which may preferably have a circular cross-section or, optionally, a square section or

  still rectangular, thus constituting a sort of deformed ribbon

mable plastically.

  The core 1 is associated with a wrapping wire 2 which is wound

  in successive turns, for example contiguous to the state of rest of the soul 1, that is to say when the latter is not subjected to any tension of elongation. The wrapping thread 2 may be constituted by

  a natural, artificial or synthetic fiber, monofilament or

  tibrins. The wrapping thread 2, hereinafter referred to as the exterior, is associated with a heat-sealing product deposited, at least locally,

  3. Preferably, the heat-sealable product is

  resin, for example that commercially available under the trademark "ELVAX 4310" and which may be defined as an ethylene / vinyl acetate / organic acid terpolymer (designation

2,492,418

  in English: ethylene / vinyl acetate / organics acids terpo-

  Lymer). The fusible product can be reported in several suitable ways on the turns 3 or can be reported on any

  the surface of the outer wrapping thread, in particular by coating.

  In some cases, it may be envisaged to report the fusible product on the turns 3, after winding of

these last on the soul 1.

  The elastic thread covered as above, can be

  switched on prior to its application on a medium.

  As illustrated in FIG. 1, this results in a relative spacing of the different turns 3 which then constitute points

  connection with the support via the thermo product.

  sticky that they wear. Application and linkage at the interface level can then be conveniently

  put the support and the guiped thread under tension between the

  pressure applicator at which a rise in temperature is achieved to sufficiently soften the fusible product, so as to establish a point connection between

the wire and the support.

  As an indication, in a context of application of the elastic yarn on a synthetic support, for example polyvinyl chloride, the implementation parameters to ensure the connection between the yarn according to the invention coated with the product known under the trademark " ELVAX 4310 '"and the support, are the following: - pressure .................. about 1 kg temperature .............. .. between 50 and 110 C - duration ....................

  less than or equal to 1 second In the case of application of the thread on a cotton support, the following parameters are applied: pressure ................. approximately 1 kg - temperature ................ between 50 and 1500 C - duration ..................... between I and 5 seconds The The voltage stress applied to the core I is, of course, a function of the characteristics of the constitutive material used and the rust to be obtained.

  The yarn guipe according to the invention can be made at a low cost and its application on media does not require complex and delicate installation of glue point deposition. This makes it possible to reduce, notably, the cost price and the cost of maintenance of the machines for applying such a wire to any support. It also becomes possible to produce continuous production lines of articles or garments that can be mass-produced at a lower cost than the cost.

current.

  Another advantage of the object of the invention governs in that it results, as the experiments have shown, a glue economy used since the product according to

  the invention involves a greater distribution that does not require

  not the occasional removal of large masses of glue

  as in currently known techniques.

  The subject of the invention can be used in many

  many areas and, more particularly, in the field of clothing.

  In this area, it is important to note the production of diapers for

  baby, protective masks, caps or caps,

  dust, underwear and tracksuits.

  Another area of application is that of linen

  house and, for example, sheets-houses.

  Fig. 2 shows an alternative embodiment according to the-

  the yarn according to the invention is constituted from the core 1 on which a yarn 4, called inner yarn, is wound in turns 5 joined to the rest state of the core 1. Preferably, the yarn outer wrapping 2, described above, is then wound on the core core I - inner wrapping wire 4, in a winding direction opposite to the wire 4, so as to obtain

  two layers of winding superimposed.

  Such a structure makes it possible to confer a good balance

  finished wire and eliminate the risk of twisting of

  the soul I associated with a single wire wrapping.

  In some cases, it may be envisaged to use an inner wrapping thread 4, with the same characteristics as the outer wrapping thread 2, with regard to the texture, the nature of the

  the constituent material, as well as the title.

  In some cases, too, the inner wrapping yarn

  4 can be associated with a fusible product deposited as described above, for example at the level of the coils 5 previously. the winding of the outer wrapping thread 2, or by prior coating of the wire 4. In such a case, the relative pressurization. a given temperature and during a

  determined time between the wire according to the invention and a support some-

  conque, allows to multiply the points of contact between these

  and also to secure the turns 3 and 5 to each other,

  level of their crossing or junction.

  Fig. 3 shows an alternative embodiment according to which the yarn according to the invention comprises a strand elastic, shown in the drawing as having a circular section. It should be understood that any other section may also be provided. The strand la, which assumes the same function as the soul I of the preceding examples $ is associated. a second strand 6 may be of such a composition as the yarns 2 or 4 and previously coated, as these

last, fusible product.

  The strand 6 and the strand 1a are associated by twisting and milling performed under tension of the elastic strand 1a. It results

  a complex formed, a. the state of rest of the strand la, by the

  of adjoining turns 7 and 8 successively belonging to the strand

elastic and stranded 6.

  The implementation of the above wire is carried out as said above by subjecting the complex. an elongation tension having the effect of spreading the different successive turns 7 and 8o The complex thus stretched is then placed on a support as previously said with application of a pressure and a temperature for a given time. This produces the softening of the heat-sealing product, at least at the portions of turns 8 in contact with the support. This results in a collage by suessive points which are all the more distant from each other than the tension

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  of elongation initially applied was great.

  Fig. 4 illustrates another embodiment of the elastic thread according to the invention. In this form, the wire comprises an elastic strand 1b that can be assimilated to the core 1. This strand 1b is energized and associated with a strand 9 which is knitted to form successive meshes 10 stretched & in the illustrated tension state. to the drawing. The strand 9 can be mono or multifilament, as described above, and is coated, at least locally, the heat-sealable product, preferably before being knitted around the elastic strand lb. The stretched state of the complex thus formed is chosen to

  show that the yarn obtained involves, for each mesh, the

  horizontally on the strand lb, on the one hand, a flange and, on the other hand, two and that the lateral distribution of these flanges is reversed from one mesh to the next. The different flanges thus represent, after application as mentioned above, connection points between

  the support and the complex via the thermo-product

  tights. In the foregoing, it is stated that the yarn is stretched and then applied to a support. It is certain that this mode of connection may concern the entire length of a segment of wire to be entirely applied to a support or only a part of the length of a segment to be otherwise formed, for example, a connecting element, such as a flange, a buckle,

etc ...

  The invention is not limited to the examples described and represented, since various modifications can be made to it.

without leaving his frame.

Claims (6)

CLAIMS:   1 - fusible elastic yarn, characterized in that it comprises an elastic elongated element which is associated with at least one other elongated element with which it forms a stretchy complex   Plasiquement, said second element being locally at least   of a fusible product. 2 - fusible elastic thread according to claim 1, characterized in that it comprises an elastic core and an outer wrapping thread wound in turns on the core, the wrapping thread being   associated with an at least local layer of a fusible product.   3 - Thread according to claim 2, characterized in that it comprises an elastic core, a so-called inner wrapping wire wound in turns on the core and a so-called outer wrapping wire wound in turns on the first wire wrapping according to a winding direction opposite to that of the latter, said outer thread being associated with a layer   at least local of a fusible product.   4 - Thread according to claim 3, characterized in that the inner wrapping wire is associated with a layer at least local a fusible product.   - Elastic thread according to claim 1, characterized in that it comprises an elastic element and a strand carrying a   relatively twisted fusible product.   6 - Elastic thread according to claim 1, characterized   in that it comprises an elastic element associated with an element   of a heat-bonding product knitted around said elastic element   tick around which it forms successive meshes.   7 - Elastic thread according to one of claims 1 to   6, characterized in that the element carrying the fusible product is single-stranded   8 - Elastic thread according to one of claims 1 to 6,   characterized in that the carrier element of the fusible product is multi-stranded.