FR2792952A1 - Reinforcing product for use as reinforcing framework for cement, concrete, plastic and resin structures, consists of two sheets of reinforcing threads and linking sheet of linking threads between them - Google Patents

Abstract

The product consists of two sheets of reinforcing threads and linking sheet of linking threads between them. The product for use as semi-rigid coherent type reinforcement framework, based on sheets of intersecting threads, is composed of primary sheet hung with reinforcing threads parallel to each other and transverse sheet of reinforcing threads intersecting (but not interlacing) with the threads of primary sheet and linked together, at least at points, by fusion with linking fibres, at least partially melted and based on thermoplastic material. The product may also consist of two primary sheets of reinforcing fibers parallel between each other and between sheets, and transverse sheet whose reinforcing thread are imprisoned between the threads of primary sheets. The threads of two primary sheets can be superimposed or shifted in relation to each other, and the threads of transverse sheet are oblique in relation to the threads of primary sheets. Reinforcing threads can be linked with linking threads independent of them or associated with them. Reinforcing threads can be mono-strand and mesh type.

Description

The present invention relates to the field of reinforcement products

  of a coherent nature, which are more particularly intended to constitute

reinforcements.

  The object of the invention relates, more particularly, to products intended to constitute reinforcements by being incorporated into a matrix. In many fields, it is desired to be able to reinforce a product manufactured so as to increase certain mechanical characteristics conferred by the

  constituent material used for the production of the composite product.

  It is thus known to use reinforcing reinforcements in relation to

  cement, concrete, plastics and resins.

  In the above fields, a reinforcing reinforcement is formed, generally from a mesh network which is made up or produced from fibers which can be unidirectional for certain applications or

  woven in widths of varying width.

  Unidirectional plies certainly have advantages but find limited applications, due to their weak characteristics of

  resistance to elongation in the cross direction of the fiber alignment.

  Reinforcement reinforcements based on woven fibers offer, by the different possible armours, a greater variety of embodiments, but have a drawback which is to be attributed to the method of their manufacture. Indeed, produced by weaving, such frames are composed of layers of threads, generally qualified as warp for one and weft for the other, threads which are intertwined and which are responsible for a more or less significant embuvage which does not make it possible to obtain a reinforcement with stretched wires giving greater

solidity with reinforced material.

  Neither does such a misting make it possible to have a flat reinforcement

on both sides.

  The object of the invention is to remedy this drawback by proposing a new product intended to constitute a reinforcing reinforcement which has a coherent and semi-rigid character, while being in a planar form. By consistency, it should be considered that the reinforcement is made so as to

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  present a clean outfit capable of withstanding certain constraints

  handling, or even implementation for obtaining a subsequent semifini product.

  To achieve the above objective, the new openwork product is characterized in that it is composed of at least a first stretched ply of reinforcing threads and a transverse ply of reinforcing threads, said threads being crossed without interlacing therefore without embuvage and being linked, at least locally by fusion of a

  bonding material based on thermoplastic material at least partially melted.

  Another objective of the invention is to propose a new product which can be manufactured easily and at an attractive cost price, industrially, according to variable widths, as well as to present suitable opening factors.

targeted applications.

  Various other characteristics of the subject of the invention emerge from the

  description given below with reference to the attached drawing which shows, by way of

  non-limiting examples, embodiments of the subject of the invention.

  Fig. I is a partial perspective representing, schematically, a

  portion of new product according to the invention.

  Fig. 2 is a sectional elevation taken, on a larger scale, according to the

line H-II of fig. 1.

  Figs. 3 to 6 are partial views illustrating, on a larger scale, different embodiments of some of the elements of the openwork product

according to fig. 1.

  Fig. 7 is an elevation, similar to FIG. 2, illustrating an alternative embodiment. Fig. 8 is a transverse view taken substantially along the line

VIII-VIII of fig. 7.

  Fig. 9 is an elevation illustrating an alternative embodiment from

that shown in fig. 8.

  Fig. 1 shows that the new product, designated as a whole by the reference 1, is composed of at least a first taut sheet 2 of reinforcing threads 3 which extend parallel to each other, with a constant interval in the example

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  illustrated. These reinforcing threads 3 can be qualified as warp threads, by analogy with a

  manufacturing process which would be similar to weaving.

  The new product 1 is also composed of a second ply 4 of reinforcing threads 5 which also extend parallel to each other, also in the example at a constant interval, preferably but not exclusively, identical to that determining the spacing between the threads 3. By convention still, the threads 5 can be qualified as weft threads and, in the example illustrated, extend in a general direction which is orthogonal to that of the threads 3. It must, however, be considered that 'a

  oblique orientation could also be retained.

  The ply 4 of wires 5 is placed on the same side of the ply 2 while being

  located below or above as illustrated in fig. 2.

  The wires 3 are preferably of the same nature and composition for the whole of the ply 2. The same is true for the wires 5 which, if necessary, can

  be different in nature and composition of the wires 3.

  Figs. 3 to 5 show the possibility of retaining, for the wires 3 and 5, each time, a single strand 6 of circular cross section or the like, a single strand 7 with a flat character or a multifilament shape 8, spread or not, in the manner a wick or, again, organized so that the filaments extend

parallel to each other.

  By way of example, the wires 3 and 5 can be made entirely or based on glass fibers, carbon fibers, aramid fibers, high polyester

tenacity, polyamide.

  The plies 2 and 4 are combined to have a relative strength which gives a coherent character to the new product 1. To this end, the wires 3 and 5 are linked together by a binding material 9 with a thermoplastic base. This material is advantageously constituted by fibers or binding threads 9 which are produced, at least in part, based on thermoplastic material and which are, at least locally, subjected to melting or softening, so as to establish, in the plane of the product 1, a

  connection between fibers 3 and fibers 5.

  In an illustrated example, each spacing between two wires 3 or 5 is occupied by a binding wire 9 bearing the reference 92 or 94, depending on whether they correspond to

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  the ply 2 or the ply 4. The wires 9 are also organized into two corresponding plies, so as to constitute an internetwork having connection points, such as 10, with the fibers 3 and connection points, such as 11, with the fibers 5. In addition, the fibers 92 and 94 have, between them, connecting points 12 at the right of their crossings. The fibers 9 may be of any suitable nature meeting the qualification of thermoplastic, preferably being constituted by

  monofilaments, for example polypropylene, polyethylene, polyamide.

  Within the meaning of the invention, it must be considered that each fiber 9 can advantageously be formed by a core of one of the constituent materials of the threads 3 or 5 having undergone, prior to the constitution of the new product, a coating or sheathing with a thermoplastic suitable for the binding function

  and for its compatibility with the material of the core.

  If fig. 1 highlights the use of binding fibers independent of the reinforcing threads 3 and 5, it is preferable, within the meaning of the invention, to implement a constructive principle consisting in associating the binding fibers 9 with the threads reinforcement 3 and 5. The association can result from an addition during the prior formation of the wires 3 or 5 in the multifilament form or wicks such as

so-called comele sons.

  Fig. 6 shows that it may also be advantageous to associate, with each wire 3

  or 5 constituted by a monofilament 6, a fiber or a wire 9 for binding.

  To illustrate the object of the invention, various types of embodiment are

given below.

EXAMPLES

EXAMPLE 1:

  Nature of reinforcement threads: glass Nature of binding threads: co-PA coated glass Opening factor: 4 mm x 4 mm

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EXAMPLE 2:

  Type of reinforcement threads: glass Type of binding threads: co-PA coated glass Opening factor: 10 mm x 8 mm

EXAMPLE 3:

  Nature of the reinforcement threads: PET HT Nature of the binding threads: Co-PA coated glass Opening factor: 5 mm x 5 mm

EXAMPLE 4:

  Nature of the reinforcement threads: glass / comelé PP Nature of the binding threads: glass / comélé PP Opening factor: 10 mm x 10 mm Consideration of fig. 2 shows that the new product 1, due to the tense nature of the reinforcing wires 3 constituting the ply 2, or even the wires 5 constituting the ply 4, determines a mesh network in which the two constituent plies each remain established in its plane, so that the finished product is free of fogging, as happens with interlacing or

  interweaving of woven fibers.

  Such a new product is able to provide improved reinforcement characteristics due to its stretched threads and also has flat faces which make it possible to produce a finished or semi-finished part in which at least one of the faces must have an appearance uniform, smooth and regular. Such a result can be obtained by orienting the new product, when it is used as a reinforcing reinforcement, in such a way that the ply 2 is oriented towards the face.

  to present the smooth and regular surface condition.

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  Fig. 7 shows an alternative embodiment in which the new perforated product I involves two stretched sheets 2a and 2b which meet the characteristics given above and between which the wires 5 of the

tablecloth 4.

  In such an exemplary embodiment, as illustrated in FIG. 8, the wires 3a and 3b, constituting the layers 2a and 2b are arranged in superposition of planes, while a variant according to FIG. 9 consists in placing them alternately, from the ply 2a to the ply 2b, for example by a half-pitch spacing between two constituent wires 3

of the same tablecloth.

  It goes without saying that the new product according to the invention can be manufactured in any width, at an attractive cost price, without requiring installations

particularly complex.

  The new product obtained can be used as a reinforcement by being completely embedded in a matrix or by simply being associated with a material of

filling on one side only.

  The object of the invention, as illustrated by the drawings, is represented in the form of a perforated planar product. It should, however, be understood that within the meaning of the invention the opening factor can be variable and that it can even be close to zero when it is chosen to form the plies 2 and / or 4 with wires. , fibers or wicks which are joined together in parallel. In such a case, the rate of

coverage then tends to 100%.

  The invention is not limited to the examples described and shown since

  various modifications can be made without departing from its scope.

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Claims (9)

CLAIMS:   1 - New product, intended to constitute a flat reinforcing reinforcement, of a coherent, semi-rigid character, based on plies of crossed wires, characterized in that it is composed of at least a first stretched ply (2) of reinforcing threads (3) parallel to each other and to a transverse ply (4) of reinforcing threads (5), said threads being crossed without interlacing therefore without shrinking and being linked, at least locally by fusion of binding fibers (9 ) based on material   thermoplastic at least partially melted.   2-New product according to claim 1, characterized in that it comprises two stretched plies (2a, 2b) of reinforcing threads, mutually parallel in each ply and for the two plies and a transverse ply whose threads   reinforcement are trapped between the reinforcement wires (3a, 3b) of the stretched sheets.   3 - New product according to claim 2, characterized in that the son   reinforcement of the stretched sheets (2a, 2b) coincide in superposition of planes.   4 - New product according to claim 2, characterized in that the son   reinforcement of the stretched sheets (2a, 2b) are offset by a half-spacing step.   - New product according to one of claims 1 to 4, characterized in that   that the reinforcing wires (5) of the transverse ply (4) are oblique to the   reinforcing threads (3) of the stretched sheet or sheets.   6 - New product according to one of claims 1 to 5, characterized in that   that the reinforcing threads are linked by binding threads independent of said reinforcing threads.   7 - New product according to one of claims 1 to 5, characterized in that   that the reinforcing threads are linked by tying threads which are associated with said reinforcing threads.   8 - New product according to one of claims 1 to 7, characterized in that   that the reinforcing threads are solid.   9 - New product according to one of claims 1 to 8, characterized in that   that the reinforcing threads are formed by wicks.   - New product according to one of claims 1 to 9, characterized in   that the reinforcing threads are made of a material chosen from the following: glass,   carbon, aramid, high tenacity polyester, polyamide. 8 2792952   11 - New product according to one of claims 1 to 10, characterized in   that the reinforcing threads are linked by tying threads which are, at least in part, constituted by a thermoplastic material chosen from the following families:   polypropylene, polyethylene, polyamide.