FR2526818A1 - NON-WOVEN TEXTILE GRILLE - Google Patents

Abstract

PERFECTED UNWOVEN TEXTILE GRID OF THE TYPE CONSTITUTED BY A BUNDLE OF PARALLEL WEFT YARNS 1, TAPPED BETWEEN TWO LINES OF CHAIN THREADS ALSO PARALLEL AND IN WHICH THE SAID CHAIN THREADS ARE SUPERIMPOSED ONE ON THE OTHERS AND IN THE WEFT THREADS 1 COHESION OF THE ASSEMBLY IS OBTAINED BY COATING WITH AN APPROPRIATE RESIN, CHARACTERIZED IN THAT AT LEAST PART OF THE CHAIN THREADS3 ARE MULTIFILAMENTARY SYNTHETIC THREADS WITH LARGE VOLUMINOUS ELASTIC TEXTURES. APPLICATION: WATERPROOFING REINFORCEMENT.

Description

NON-WOVEN TEXTILE GRILLE

  The invention relates to a new type of grid

nonwoven fabric.

  As we know, a "grid" is a textile fabric

  Tile, woven or not, strongly open Most currently, at present, these grids are no longer woven and are obtained by the superposition of at least one sheet of warp threads on a sheet of weft son Preferably, a sheet of

  chain on either side of the weft

  in the center There are several techniques that

  For example, one of these techniques is described in our French patent application No. 77 22 475 of July 13, 1977, published under No. 2,397,479. no need to describe this technique

here in detail.

  In practice, the grid or network structure is consolidated by passing the textile assembly in a suitable glue or coating intended for gluing.

  the threads at their crossing points.

  Briefly, at present, we distinguish between

  two kinds of nonwoven grids: the first type in which the warp threads are shifted from one face to the other with respect to the weft threads; the second type in which the sons of

  string are superimposed with respect to the weft threads.

  The first staggered structure technique makes it possible to produce light weight grids, however

  the mechanical strength is insufficient for certain

  because cohesion is only realized

  at the respective crossing points.

  The second superimposed technique gives more resistant products because the warp yarns being superimposed, are glued together along their length and are also integral with the weft yarns at the crossover points. Unfortunately, these products are heavier and more expensive, which makes

  their use difficult or even prohibitive in some

some applications.

  In the manufacture of waterproofing screeds, we seek to combine lightness and strength, which is difficult with glass son Gold the market

  Demand for more and more such products.

  The invention overcomes these disadvantages.

  a product of the type in question which is at the same time economical, light, resistant and easier to conform,

  that is to say, more apt to marry various forms.

  This improved nonwoven fabric grid of

  type consisting of a sheet of parallel weft threads

  sandwiched between two layers of warp yarns

  parallel and in which said warp yarns are superimposed on each other on the weft yarns and in which the cohesion of the assembly is obtained by coating with a suitable resin, is characterized in that at least part of chain yarns are multifilament synthetic threads

  Textured elastic and high voluminosity.

In practice:

  one of the two sheets of warp yarns is made

  made entirely of synthetic multifilament yarn

  textured materials; the textured yarns are obtained by false twist,

reattached or not.

  The fact that the textured yarn is multifilament and has a large volume, facilitates the retention of the coating glue and thus the subsequent adhesion, so

the cohesion of the whole.

  The fact that the textured yarn is elastic and that these yarns are all arranged on the same side with respect to the weft yarns, facilitates the deformation of the whole

  and allows him to comply more easily.

  The manner in which the invention can be realized and the benefits derived therefrom will emerge more clearly

  following examples of

  dicative and not restrictive, in support of the figures

  Figure 1 is a section along the longitudinal axis of the weft yarn of such a preferred improved grid; Figure 2 is a section of the same grid but along the axis of the chain son bunk; Figure 3 is another embodiment in which the textured yarns are alternately arranged on one side and then the other of the central weft yarn; FIG. 4 is a schematic representation of an installation for the manufacture of a preferred grating according to FIGS. 1 and 2. In FIGS. 1, 2 and 4 (1) denotes the weft thread,

  (2) denotes the warp yarns of the lower

higher,

  (3) denotes the warp threads of the upper

  top in textured multifilament synthetic yarns

  by false torsion, remixed or not.

  These two superimposed chains (2) and (3) are

  placed on the weft web (1) by any known technique, in particular by that described in the Applicant's French patent application published under the

  No. 2,397,479 recalled in the preamble,

grooved bars (10).

  The network structure obtained (4) is taken continuously firstly on a forming cylinder (5), then on a gluing cylinder (6) where it is brought into a sizing tray containing a suitable resin

  such as: pvc, vinyl acetate, polyvinyl alcohol.

  The glued grid (8) then passes into a system

  presser-gluer (9) and finally in a system of se-

  chase drum (11) to give a finite grid (12), ie coated not only at cross points (see Fig. 2) (13) and (14) respectively lower warp threads (2) and upper (3) on the weft yarns (1), but also on the portions (15) of covering the warp yarns (2) and (3) between two successive weft yarns (1). In the embodiment shown diagrammatically in FIG. 3, the textured warp yarn (3) is superimposed on another warp yarn (2), but is arranged alternately by

relative to the frame (1).

  With the assembly of FIG. 4, a grid according to FIGS. 1 and 2 with a weft (1) and a lower chain (2), a glass 51-silionne wire of upper chain (3), 110 dtex / 32-strand textured polyester yarn fused by false twist

(FTF),

  a thread of 4 warp threads and 4 screen shots per centimeter, a glue (7) of suspended vinyl acetate

aqueous.

  This gives a finite grid, that is to say glued weighing about 50 g / m 2 in which the weight

  glue represents about 10 g / m 2.

  Such a grid is very advantageous in the indus-

  sorting of the building, especially as reinforcement of the sealing screeds, because of its lightness, its high mechanical strength, its low cost, especially since one can use textured son of second choice, its excellent resistance to sliding as a result of the superimposed structure, namely the gluing in

(15);

  its ability to fold and conformation, because during such deformation, the elasticity of the textured yarn (3) can play in length and absorb

the differences.

  -5- Now, until today, we could not and we did not

  did not know how to get all these properties, including some

  Part of it was clean to either structural gratings

  superimposed such as resistance and slip resistance

  the grid structure, such as lightness and cost, but which were not at all

  common to both, and that, moreover, the original characteristic

  of the invention makes it possible to obtain new properties, namely the conformational aptitude. Furthermore, it was not possible to obtain a grid that was as light even with a close texture when

  we used a grid made entirely of glass.

  In this way, we can use these grids successfully in many applications We can mention 1 S sealing in the building, the reinforcement of films, papers, sails 6 -

Claims (4)

  1 / an improved non-woven textile grid of the type constituted by a sheet of parallel weft yarns (1) sandwiched between two sheets of parallel chain yarns and in which said warp yarns are superimposed on each other on the weft yarns (1) and in which the cohesion of the whole is obtained   by coating with a suitable resin, which is   characterized in that at least part of the warp threads (3) are textured multifilament synthetic threads   elastics with great voluminosity.   2 / Grid according to claim 1, characterized in   what one (3) of the two plies of warp threads (2-   3)) is made entirely with synthetic threads. multifilamentary textures.   3 / Grid according to claims 1 and 2, characterized   in that the textured yarns (3) are obtained by false twist fixed or not.   4 / Advanced non-woven textile grid,   characterized in that it consists of: a ply of parallel weft yarns (1), a first ply of parallel warp yarns (2) arranged perpendicularly under the ply of weft yarns (1), a second ndppe (3) ) of parallel warp threads   in multifilament synthetic textured yarns   high voluminous ticks (3), arranged on the ply of weft threads (1) and superimposed on the warp threads (2) of the first lower ply, the set of weft (1) and warp threads   (2-3) being stuck together at their crossing points   respectively (13-14) and meeting (15) by means of of a suitable resin.