FR2846346A1 - Material with surface loops e.g. for hook and loop fastening comprises backing layer with two sets of interlaced loops - Google Patents

Abstract

The looped material consists of backing layer (1) of film or non-woven fabric, covered with first set of loops (2), each loop having 2 legs (3,4) projecting from backing layer. The material has second set of loops (6), each with 2 legs (7,8) projecting from backing layer and interlaced with first set, i.e. first section (5) of first loop interlaced with second section (9) of second loop. The looped material consists of backing layer (1) of film or non-woven fabric, preferably plastic, covered with first set of loops (2), especially of knitted material, each loop having two legs (3,4) projecting from backing layer. The material has second set of loops (6), each with two legs (7,8) projecting from backing layer and interlaced with first set, i.e. with a first section (5) of first loop being interlaced with second section (9) of second loop. The backing layer is coated with an adhesive on the opposite side to the loops.

Description

The present invention relates to tablecloths comprising a film or

  a non-woven plastic, and loops from the film and in particular knitted in this film. These plies are in particular used as female elements of a self-gripping element, in particular for closures of diapers at the waist, but also for example for the fixing of seat covers in the automobile, or also for fixing

  pavilions or door trim in an automobile.

  Furthermore, the present invention also applies to the field of abrasive discs, in particular with reference to the disc fixing system.

like this to a sander.

  A sheet of this kind is already known in the prior art, comprising a plastic film or nonwoven, and a first network of knitted loops in the sheet. These layers of the prior art have several drawbacks. First of all, the loops are all formed by being oriented in the same direction, i.e. the top of each loop is on a given side (left or right) of the feet of the loop for all the loops of the tablecloth. This results in less good hooking of the hooks of a hook-and-loop fastener in one direction compared to the other direction. On the other hand, these plies have the disadvantage that the loops tend to lie against the film. The attachment is thus hampered. "0 In addition, the manufacture of these plies requires the use of a wire which is large enough to obtain a certain overall resistance of the structure. It follows that these plies of the prior art are expensive to manufacture, the wire being the most expensive part of the manufacturing process. In addition, the loop networks used are such, in order to obtain a sufficiently resistant structure, that the linear production of these na-ppes is

2 5 slow.

  The present invention aims to overcome the drawbacks of the plies of the prior art by proposing a ply which on the one hand has loops oriented in both directions relative to their foot, which on the other hand has loops which tend to be better kept straight with their apex at a distance from the film so as to obtain better adhesion, which furthermore

  requires a smaller wire for manufacturing, the structure being simplified, while however being as strong or even more resistant than the structures of the prior art and in particular by requiring less pitting in the plastic film so that it it retains its integrity better and does not tear.

  According to the invention, the sheet, intended to be fixed on a support, comprising a film or a nonwoven, in particular of plastic material, and a first network of loops coming from the film (or film) or from the nonwoven, in particular by being knitted there, each of the first loops consisting of two first feet from the film or nonwoven, and a first section of yarn connecting the first two feet, each first section being on a given side of the two first feet for all the first loops, is characterized in that it comprises a second network of loops from film or nonwoven, and in particular knitted in this film or this nonwoven, each of the second loops being made up of two second feet from the film or nonwoven and from a second section of yarn connecting the two second feet, each second section being in relation to these two second feet eds of the I0 side opposite to a given side of the first two feet, a first section of a

  first loop intertwined with a second section of a second loop.

  A sheet is thus obtained, which can in particular be used as female parts for hook-and-loop devices, which has loops oriented in both directions and which are well kept away from the film or non-woven fabric so as to allow introduction easy hooks for good hanging. In addition, this structure is particularly simple to manufacture and in particular can be implemented on a knitting loom with the use of a single bar, or even two bars, which makes it possible to increase the production rate.

  compared to the prior art system.

  0 What is more, we obtain a set which is more resistant, because the loops being interlaced, they also ensure a certain resistance of the overall structure, so that the sheet has less tendency to tear. As the overall resistance is greater, we can use thinner wire while obtaining

  a resistance of the structure as good as that of the prior art.

  D 5Finally, as the resistance of the assembly is greater thanks to this new arrangement of the loops, it is possible to provide for a greater spacing between the rows of loop feet and consequently a less piercing of the film or of the nonwoven, of so that the tear resistance of the film and the nonwoven

is bigger.

  According to an improvement of the invention, a layer of

  glue on the face of the tablecloth on the side opposite the loops.

  Thus, the feet of the loops and the loops are kept in position, in particular by preventing the thread from sliding through the film.

  In particular, the tablecloth can be transported to a post in a È> manufacturing plant, for example a diaper, for fixing it to a diaper for example, without the loops tending to come loose during the

  travel or during handling to place the tablecloth in the production line.

  Preferably, the adhesive layer is applied continuously

all over the face of the tablecloth.

  According to another embodiment, a film or film, in particular made of plastic, is bonded to the face of the ply on the side opposite the loops.

  According to a preferred embodiment of the invention, the first O legs are arranged in rows and columns and the second legs are arranged in rows and columns, in particular a first leg lying midway between

  two second feet and vice versa.

  According to a preferred embodiment of the invention, the sheet has a basis weight between 20g / m2 and 150g / m2, and in particular between 20g / m2 and 10 40g / m2 for a diameter of the loop threads between 17 and 120 decitex and in particular between 22 and 70 decitex. These ranges of weight and thickness of threads are particularly suitable for an application in the field of diapers, in particular because of an excellent value for money compared

to the prior art.

  The present invention also relates to methods of

  manufacture of a sheet according to the invention.

  A first method of manufacturing a looped ply according to the invention, on a knitting loom comprising rows of needles and rows of passettes corresponding to the rows of needles, comprises steps' 0 which consist in disposing needles in every second place where the passettes for the loom pass, and to use a passbar in 1.0-3.4 weave,

  all the passettes being filled with thread.

  Thus, at a first needle (at position 0.1), a mesh is formed with a jetty on (between the 1 and the 0), then at a point arranged at a distance between two adjacent needles, point known as without needle, a mesh is formed with a jetty on (between the 3 and the 4). As there is no needle in this location, there can be no mesh formed and it turns into a weft

  This is the formation of a loop section while in 0.1 it is the foot of a loop which is formed.

  Another method of manufacturing a tablecloth according to the invention, on a warp loom comprising rows of needles and rows of passettes corresponding to the rows of needles, comprises the steps which consist in placing the needles at a location on two passers of passage, and to use two bars, a first weave bar 00-2.3 and a second weave bar 35 1.0-3.3, the passettes being filled with wire only at a rate of one in two , with offset between the two bars, the first bar first forming a weft connection in position 00 then a jetty on in position 2.3 while the second bar first forms a mesh with jetty on in position 1.0 then a weft in

position 3.3.

  This avoids in both cases of making too many needlesticks. The present invention also relates to a laminate assembly comprising a sheet according to the invention fixed to a support, in particular by laminating.

  In particular, the invention relates to a laminated assembly whose support is

a diaper.

  The film has a weight between 20g / m2 and 50g / m2, preferably between 15g / m2 and 20g / m2.

  The ply of the present invention also has significant advantages for application in the field of fixing abrasive discs, for example on a sander. In fact, the sheet according to the present invention provides a particularly robust and effective fixing, and with a manufacturing

  very simple fixing system compared to the prior art.

  In particular, for application to the abrasive disc, a weight of the ply I5 * of between 40 g / m2 and 100 g / m2, with threads having a denier of between 20 and

  décitex, provides a binding with a very good value for money.

  In addition, the present invention relates to a diaper comprising a female self-gripping part comprising a ply according to the invention.

  Preferred embodiments of the invention will now be described, given solely by way of example with reference to the drawing in which FIG. 1 represents a graph of the manufacture on a needle loom of a loop ply along 'invention, using a single bar with a weave 1.0-3.4 Figure 2 shows a graph of manufacturing a web according to' 5 the invention on a needle loom using two bars, the first bar in a weave 00- 2.3 and the second bar following armor 1.0-3.3; Figure 3a is a top view of the looped ply according to the invention, obtained by the method of Figure 1 or Figure 2; FIG. 3b is a side view of the loop ply of FIG. 3a.O and

  Figure 4 is a descriptive diagram showing a knitting loom to obtain the tablecloth according to the invention.

  3a shows, in top view., The loop network obtained 35 after removal of the web of the loom made according to the arrangement of Figures 1 or 2. On a film or film or nonwoven of polyethylene, polypropylene, polyester, etc. ., it is formed two networks of loops. The first loop network

  consists of loops 2, each consisting of two feet 3 and 4 and a section 5 connecting the two feet. All of these loops 2 are all formed to the right of their respective feet 3, 4 in the figure. All of the loops 2 of this first network are turned to the right in the figure with respect to their respective feet. A second network of loops 6 is also formed. Each loop 6 has two feet 7 and 8 respectively of which extends a section of wire 9 connecting the two feet.

  All of the loops 6 of this second network are turned to the left in the figure, that is to say in the opposite direction to that in which the loops 2 of the first network are rotated. Each foot of a loop 6 of the second network 10 (respectively of the second network) is midway between two feet 7, 8

  of a loop 2 of the first network (respectively of the second network). Each loop 2 of the first network is interleaved with two loops 6 of the second network.

  and reciprocally. Thus, the loops of the two networks tend to be maintained

  mutually straightened up.

  According to a first possible embodiment, the wire forming the loops is a polyamide wire of 44 decitex, so that the total assembly weighs

  between 23 and 28 g / m2, i.e. 8 g / m2 of loop wire and 15 to 20 g / m2 of film.

  According to another possible embodiment, a 76 decitex polyester yarn is used, the whole then weighing between 29 and 34 g / m2, namely 14 g / m2 of

  -0 loop thread and 15 to 20 g / m2 of film.

  In Figure 1, there is shown a first method of manufacturing a sheet according to Figure 3. A plastic film 1 is deposited on a knitting machine. This knitting loom has rows of needles and threads facing the needles. A single guide bar will move from needle N5 to needle. The bar will move from pass passage position to

  Passage passage knowing that in Figure 1 there is only one needle disposed every two bar passage positions, that is to say that the bar will alternately move to a position with a needle then to a position in which there is no needle. On the other hand, all the passettes are full, that is to say loaded with a thread.

  In FIG. 1, the stroke of the bar for the formation of the loops is carried out according to a weave 1.0-3.4.

  The bar cycle is as follows.

  At first, it knits in a needle with a throw on 35 (1.0), then in a needle location where there is no needle (3.4), so that there is then unraveling and therefore formation of a weft. Thus, at the first needle, the bar forms the foot of a first loop then forms at the location where there is

  more needle, the top of this first loop.

  Then passing to the next row it will first unravel and then mesh, so that the second network of loops is formed.

  The two loop networks are thus obtained. In Figure 2, there is shown another armor system with two bars. The needles here again are arranged in a row of needles. On the other hand, there are provided in this second embodiment two bars of passettes Bi and B2. In each of the two bars, the passettes are only filled with thread every second pass (one full, one empty) (offset one by

  compared to each other). Similarly, only one needle in two is fitted.

  The armor of the first Bi bar is 00-2.3 while the armor of the

second bar B2 is 1.0-3.3.

  The first bar will therefore alternately screen and mesh while the second bar will do the opposite, namely mesh and screen. Whatever the manufacturing method used, the same final ply is obtained from the loom D 5 described above and shown in FIG. 3.

  At the place where the bar (s) unravel or squeeze (where the loop sections are formed) it is necessary to provide a pool bar or lancet comprising claws, in order to obtain a sufficient height of the loops when removes the looped tablecloth from the loom, knowing that there are no more needles at the location -0 of this unraveling or of this screening to ensure by retention a sufficient height

curls.

  In either case, you can use a gauge 18 by positioning only one needle out of two or even use a gauge 28 and knit only one needle out of 3. However, it goes without saying that obviously all another 25 gauge can be used.

  You can apply a layer of glue on the face of the tablecloth on the side opposite the loops. The glue can take any possible form, for example a

  powder glue or thermo-glue.

Claims (10)

R E V E N D I C A T IO N S   1. Tablecloth intended to be fixed on a support, comprising a film (1) or a nonwoven, in particular of plastic material, and a first network of loops (2) coming from the film or of the nonwoven, in particular by being knitted therein , 5 each of the first loops (2) consisting of two first feet (3, 4) from the film or nonwoven, and a first section (5) of wire connecting the two feet, each first section being on a given side of the first two feet for all the first loops, characterized in that it comprises a second network of loops (6) from film or nonwoven, each of the second 10 loops being made up of two second feet (7, 8) from film or   nonwoven, and of a second section (9) of thread connecting the two second feet, each second section lying with respect to its two second feet on the side opposite to said one side of the first two feet, a first section (5) a first loop (2) intertwined with a second section (9) of a second loop (6).   2. Tablecloth according to claim 1, characterized in that there is applied a layer of adhesive on the face of the ply on the side opposite the loops.   3. Tablecloth according to claim 1 or 2, characterized in that the film or film or the nonwoven has a weight of between 20g / m2 and 50g / m2, preferably between 1 5g / m2 and 20g / m2.   4. Tablecloth according to one of claims 1 to 3, characterized in that the first legs are arranged in rows and columns and the second legs are arranged in rows and columns, in particular, a first leg lying at   mid distance between two second feet and vice versa.   5. Tablecloth according to one of claims 1 to 4, characterized in that   that it has a grammage between 20g / m2 and 150g / m2, and in particular between 20g / m2 and 40g / m2 for a diameter of the loop wires between 17 and 120   decitex and in particular between 22 and 70 decitex.   6. Method for manufacturing a looped ply according to one of claims 1 to 5, on a loom comprising rows of needles and   rows of sieves in correspondence with the rows of needles, characterized in that it comprises the steps which consist in placing the needles in one of the two places where the sieves pass through, and in using a bar   passette following a weave 1.0-3.4, all the passettes being filled with wire.   7. A method of manufacturing a sheet according to one of claims   1 to 5, on a warp loom comprising rows of needle and rows of passettes in correspondence with the rows of needles, characterized in that it comprises the steps which consist in placing the needles at one of two passage locations of passettes, and to use two bars, a first armor 00-2.3 and a second armor 1.0-3.3, the passettes being filled only once in two, with offset between the two bars, the first bar first forming a weft link in position 00 then a jetty on in position 2.3 while 5 the second bar first forms a mesh with jetty on in position 1 0 then a frame in position 3.3.   8. Female part of a hook-and-loop fastener comprising a ply according to one of claims 1 to 5.   9. Diaper comprising a closure having a female part 10 according to claim 8.   10. Abrasive disc comprising on one of its faces, in particular by adhesive fixing, a ply according to one of claims 1 to 5, the ply having   a basis weight between 30 g / m2 and 100 g / m2.