HU176337B - Method for producing multiple textile material - Google Patents

Abstract

Reinforced sheet textile material, esp. fleece, is produced by 1 ocally heating one or several fibrous components and a thermoplastic component and mechanically compacting these before and/or during and/or after heating. Pref. heating is effected by an electron beams or laser beams impinging on a uniaxial film of polypropylene, or an acrylic acid soln. and/or polymers such as unsatd. polyester resins. A non-thermoplastic component such as PAN fibres can also be used.

Description

FIELD OF THE INVENTION The present invention relates to a method for producing a multilayer fabric comprising combining one or more prefabricated textile flat shapes, preferably non-woven fabrics, and at least one thermoplastic stretchable, preferably polypropylene film in an axial direction, locally heated and mechanically compacted.

Methods for producing multilayer textiles have long been known. They are mainly intended to reinforce non-woven fabrics made up of filamentary fibers, such as mechanical processes, needle knotting, felting, and the like. by. A common disadvantage of such procedures is that the reinforcing effect of reinforcement is generally unsatisfactory.

The reinforcement of the nonwoven fabrics has also been carried out by polymerization or condensation of monomeric or polymeric structural materials, with the disadvantage that the process has rendered the multilayer textile material stiff, losing its textile properties, in particular its smoothness and elasticity.

It is also known to produce multilayer textile materials from films. In doing so, the films are subjected, prior to mechanical treatment, to enea radiation, such as electron radiation, to improve their fiber tendency, and then the nonwoven fabric is formed. The disadvantage of such materials is that they can be used essentially only for technical purposes and are almost completely unsuitable for dressing purposes. 30

It is also known to process a wet drawn fibrous material, such as polyacrylonitrile, to obtain a gel state by an ion exchange process. The material is then refined, for example, by radiochemical means. However, the multilayer textiles produced in this way have only a lower strength.

In another known process, individual layers of multilayer textiles were subjected to radiation, for example to form reactive groups, and then the individual layers were combined. However, the multilayer textile material resulting from such a process is largely usable for technical purposes and is almost unsuitable for the manufacture of garments.

Thus, in the prior art, it can be summarized that in the production of multilayer textiles, the main focus was on increasing the strength of the material, less on the dyeing, dyeing, processability and applicability of the material.

It is an object of the present invention to further improve the prior art processes while eliminating all the drawbacks associated therewith.

SUMMARY OF THE INVENTION The object of the present invention is therefore to provide a process for producing a multilayer textile material which, on the one hand, is capable of producing a dyed, dyed, dyed textile material which is of sufficient strength and, on the other hand, is easy to process.

The present invention is based on the discovery that the object of the present invention is simply solved by properly combining the thermoplastic film with the textile flat sheet and then irradiating it.

Thus, in the process of the present invention, it is a further development to irradiate the thermoplastic film and the textile flat sheet with high energy radiation after they have been united, but prior to heating and compression, and preferably heat-blast the thermoplastic film. This, on the one hand, brings about the increased strength of the multilayer textile material and, on the other hand, the material becomes suitable for clothing without further treatment. Thus, as will be seen in more detail, despite the relative simplicity of the measure, it fully ensures the simultaneous fulfillment of the complex requirements mentioned above.

According to the invention, it is expedient to contact the flat stack before and / or after heating and / or irradiation with high energy radiation, in particular with monomers and / or polymers. The monomers are preferably aqueous acrylic acid and the polymer is unsaturated polyester resin. In this way, the properties of the multilayer textile material are further improved, its strength is increased and the fabricability of the garment industry is increased.

The non-thermoplastic component of the present invention is preferably wet-drawn, ion-exchange and displacement-modified polyacrylonitrile fibrous material 30, which greatly enhances the strength of the multilayer fabric.

It is advisable to use a laser beam to heat the flat shapes, since this solution is perfect for local heating. 35 In order to properly develop and enhance the strength of the multilayer fabric, it is expedient to heat the planar array by laser radiation at points, along lines, in raster form, and / or some combination thereof. 40

The invention will be described in more detail by reference to the drawing, which illustrates, by way of example, some preferred embodiments of the process. In the drawing it is

Fig. 1 is a flow diagram of a multilayer fabric made from two nonwoven fabrics and a polypropylene film,

Fig. 2 is a schematic flow diagram of the production of a multilayer fabric consisting of two carded nonwoven fabrics and three films;

Figure 3 is a manufacturing sketch of a multilayer fabric made of ion-exchanged polyacrylonitrile fibers and film,

Figure 4 is a block diagram of the production of polyacrylonitrile-polypropylene non-woven fabric 55,

Fig. 5 is a schematic diagram of a linear deflection of a laser beam and a

Figure 6 is a linear schematic diagram of raster-like deflection of a laser beam. ⁶⁰

Example 1

Composite needle web of needles made of two 4-needle felt felts of viscose fibers weighing 70 g / m ² each, plus one 5-ply polypropylene foil with one 4-needle webs of 4 gauge thickness and 5 g of electron radiation previously exposed to 7 · 10 ⁶ radios összenemezelünk. In the above operation, the film is split into filaments. The subsequent irradiation of 2 laser radiation sources with suitable wavelengths and intensities of radiation at specific points of the felt results in the fusion of the filaments, thereby significantly increasing their strength properties and characteristics, thereby obtaining reinforced nonwoven fabrics (Figure 1). .

Example 2

A composite flat molding consisting of two carded cotton webs 7 and two transversely stretched polypropylene films 8 and longitudinally stretched polypropylene films 9 having a surface weight of 60 g / m ^{2 is} applied. The polypropylene films used, each having a thickness of 30 gm, were previously exposed to electron irradiation at a dose of 6 x 10 ⁷ radios to improve the scattering tendency. The above layered flat form is sewn together in needle needle bed 6 needles while the films are broken into filaments. The subsequent irradiation of the laser beam 2 with suitable wavelengths and intensities at certain points of the felt results in the fusion of the filaments, whereby the strength properties are significantly increased, thereby obtaining a reinforced non-woven fabric (Fig. 2).

EXAMPLE 3 A PVM fiber blanket 11 is laminated onto a gm thick unidirectional polypropylene film 10 and irradiated with a dose of 10 ⁷ electron beam 14 under the electron accelerator beam 12. It is solidified by means of a needle bed 6 arranged between the pairs of rollers 15 while the film is broken into filaments. The laser source 2 produces spot-like welds which significantly increase the strength of the nonwoven fabric. As a result of the heat effect, the active reaction nuclei formed in the PVY fiber coat 11 with the electron beam 14 are disintegrated at certain points simultaneously. The non-woven fabric so pretreated is transferred to a grafting vessel 16, where it is grafted at 70 ° C with a 15% aqueous acrylamide solution. The acid dye mixed with the graft bath is absorbed only at the graft sites, resulting in a color pattern. After pulling through 17 dryers, the reinforced non-woven fabric is wound (Figure 3).

Example 4

Cotton fabrics weighing 150 g / m ² are fed into a sheeting machine together with two polypropylene films previously subjected to irradiation. As a result, mailpol planes are formed, whereby the foils, by the action of the needles, burst into filaments and are incorporated into the cotton fabric. Thereafter, a heat treatment is performed which results in the melting of the polypropylene fibers, resulting in fused lumps which provide sufficient reinforcement without losing the textile nature of the material.

EXAMPLE 5 Polyacrylonitrile Fibers 18 made by known ion exchange processes and having 180 g / m <^2> surface-weighted felts are irradiated with an electron beam 14 at a dose of 5 x 10 ⁶ under the beam 12 of an electron accelerator. During this process, the felt 18 produces reactive cores for subsequent graft copolymerization, while the unidirectional stretched polypropylene films 10 tend to become fibrous. Using a needle bed 6, the polypropylene films 10 are broken into filaments and homogenized with the felt 18. The post-treated felt 18 is passed between a pair of press rolls 19 and then subjected to a laser source 2. The spot irradiation is carried out using pulsed laser sources known per se and the appropriate optics for this laser source. However, several pulsed laser sources can be used for this purpose without optics. After laser irradiation, the J 8 felt is grafted into a 10% aqueous acrylic acid solution, where dye is also mixed, and the contact time is selected for 30 seconds. After grafting, the felt 18 is washed in a washing machine 21 and then dried in a dryer 17 and collected on a rewinder 22. The above reinforced structured nonwoven fabric exhibits particularly good dressing physiological and representative properties (Figure 4).

Example 6

The nonwoven fabric produced in Example 5 is subjected to laser radiation using line irradiation produced by the use of roller lenses 23 of known design (Figure 5). Further treatment of the product is carried out as described in the previous example.

Example 7 'The nonwoven fabric produced in Example 5 is subjected to mesh-like laser radiation, which results in, for example, a dull structural effect. The irradiation is performed with two pulsed laser sources 2 (Fig. 6).

Patent claims:

Claims (7)

0 Patent claims: A method for producing a multilayer textile material comprising: one or more prefabricated, textile flat shapes, preferably nonwoven, and at least 5 a thermoplastic film, preferably in the direction of an axis, preferably made of polypropylene, is superficially combined, heated locally and mechanically compressed, characterized in that it is heat-sealed and heat-sealed after being combined and heat-pressed the thermoplastic film is preferably mixed by pin-cracking. 2. The method of claim 1, wherein the planar shape is heated. Prior to and / or after irradiation with high energy radiation, it is contacted with chemicals, in particular monomers and / or polymers. 3. The process of claim 2 wherein the monomers are aqueous acrylic acid and the polymer is unsaturated polyester resin. 4. A process according to any one of claims 1 to 5, characterized in that the non-thermoplastic component is a wet-drawn polyacrylonitrile fiber modified by an ion exchange and displacement process. 5. A method as claimed in any one of claims 1 to 4, characterized in that the flat assembly is heated locally by laser radiation. i 6. A method as claimed in any one of claims 1 to 4, characterized in that the planar shape is heated by laser radiation at points, along lines, in raster form and / or any combination thereof. 7 drawings, 7 figures Responsible for publishing: Director of Economic and Legal Publishing 814150 - Zrínyi Printing House, Budapest