HU199913B - Method for producing product of lattice web or lattice net character of artificial fibre base - Google Patents

Abstract

The present invention relates to a process for producing synthetic fiber-based lattice fabric or lattice-like product, in which fibers are made of synthetic fibers. The process is characterized in that the expanded fibers are woven into a mesh with a dreher linkage while both the lower and upper chain wires are rotated and the warps are loaded with equal tension, and the weft is a monofilament of weft, and the weft from the weft is immediately thirty to 70 t impregnated with a polymer solution containing 20% acrylic acid copolymer or 20 to 701% low plasticizer plastic, heat-treated at a temperature of 80 to 180 ° C and then wound with a peripheral drive. EN 199913 A Scope of the specification. 4 pages without alm -1

Description

FIELD OF THE INVENTION The present invention relates to a process for the production of lattice or lattice-like products of a synthetic material.

A 2.531.222. U.S. Patent No. 5,600,300 discloses a filter cloth whose knots are made with a weft knit and which have two weft fibers, one of which is not circular in shape, but oval or sponge-shaped. A 2.633.372. U.S. Patent No. 5,663,500 discloses a filter fabric whose knots are made with a regular dreher bonding using a circular weft fiber. However, both solutions provide a non-fixed web of webs which tend to shrink and are, for example, unsuitable for the production of shell-like products.

A 3.120.661. U.S. Pat. No. 5,198 discloses a mesh fabric whose knots are made by dreher bonding using two weft strands, and the strands are coated with bitumen or neoprene to prevent adhesion to one another. The main disadvantage of this solution is that the anti-slip binders are chemically incompatible with the plastics commonly used for coating shell-like fibrous fabrics with a coating on both surfaces.

In the plastics industry, such materials, coated on both surfaces with a fibrous web, are widely used. These materials are used to make various shell structures, such as tents, truck covers or tarpaulins.

For example, this type of material can be produced by applying a special PVC-plastisol film to both sides of a fabric made of synthetic fiber such as polyester. However, this solution has the disadvantage that the lubricated film has very poor adhesion to the fibrous web. There is no doubt that other solutions to overcome this poor adhesion are known. According to this solution, a two-component polyurethane additive is used to form a film with good adhesion upon exposure to heat. However, this improved solution also has significant disadvantages. For example, this technology requires a quadruplicate lubrication, which obviously increases the production cost enormously. A further disadvantage is that the polyester fabric used as the base fabric must have a very rich fabric structure in order to provide adequate tensile strength. A further disadvantage is that only emulsion PVC can be used for this technology, which is known to be extremely expensive. These solutions can be used economically to produce high tensile products in particular.

However, in many areas of life, lower tensile strengths of up to 2000 N / 5 cm are required.

The most widespread method for producing these types of products is to use a thermoplastic process to laminate a PVC layer on a lattice fabric made of synthetic fibers, such as polyester fibers. PVC film obtained by other slurry polymerization can also be used for this method. The PVC films are thermoplastically bonded through the voids of the mesh. Thus, there is no need to use the highly costly two-component polyurethane additive used in any of the above-mentioned technologies. A further advantage of this solution is that the production of the fibrous mesh used as the base material is a much less material intensive operation than the dense weave fabric used in the previous solution. Finally, it should be emphasized that this technology is more productive in terms of calendering than the lubrication operation under the previously mentioned technology.

For example, for this technology, the French company Shawanoz produces webs using monofilament fibers for this purpose. Monofilament is used to make woven fabrics on a weaving machine. This fabric is then transformed into a mesh structure using special technology treated as a factory secret, in which the crosslinks are thermoplastic bonded at the points of contact. It is believed that the construction of the mesh structure involves highly sophisticated mechanical equipment which involves not only thermoplastic treatment but also impregnation with techniques not described. The disadvantage of this solution is that, on the one hand, monofilament threads must be used on the other hand, and the said fastening technique requires very complicated and expensive equipment. Undoubtedly, this method can be used to produce a tissue-based product for a variety of technical purposes by properly controlling the quality of monofilament fibers and the density of the tissue. By the way, the PVC films are laminated to this web according to the technological method described above.

Finally, for the sake of completeness, it is noted that polypropylene is also formed by extrusion mesh, but it is unstable, strongly shrinkable, easily ruptured, and can therefore only be used as a fence or wrapper.

It is an object of the present invention to provide a technology that is suitable for the production of fiber-based products that can be used in any given technical field without disadvantages of the solutions described above.

It has been found that if both the lower and upper yarns are spun in the weaving system, the two yarns in the web will be unstressed. Thus, in the case of two knitting yarns, the fibers are equally involved in the spinning and thus encircle the weft yarn.

We also discovered that when the finished mesh immediately after weaving is PVC or acrylic-21

EN 199913 Impregnated with amide polymer, good net stability can be achieved economically.

The present invention relates to a process for the production of lattice or grid-like products made of a synthetic fiber material. According to the present invention, a synthetic fiber is formed into a dyed fiber, the dyed fiber is woven into a mesh while the lower and upper strands are twisted and the strands are equally tensioned and the weft is woven directly from the weft. - impregnated with a solution containing 701% acrylic acid copolymer or 20-70% by weight of low plasticizer PVC plasticisol, heat-treated at a temperature of 80-180 ° C, and then rolled up using a peripheral drive.

The synthetic fiber of the present invention is preferably a polyester or polyamide type fiber.

The following examples illustrate the invention, in particular:

Example 1

Three 167 dtex polyester filaments were passed through a 150 C C deflection chamber for bulking. A single strand of 540 dtex is pulled out of the tail chamber by stretching.

From this fiber, the dreher bond of the present invention is used to form a mesh by threading two fibers of 540 dtex, threading two threads of the same quality in the strand so that they move up and down, and warp the threaded thread. As a result of the movement, the two strands moving in the chain direction merge into a single filament, thus having a value of 1080 dtex. The weft thread is also 1080 dtex.

The tissue thus prepared is passed through an aqueous dispersion acrylic acid ester-based bath so that the residence time of the tissue in the bath is one minute.

The composition of the bath is as follows:

component Weight (g) Binder LB (manufactured by Mattery Cooperative, acrylic acid copolymer) 70.0 Binder LK (manufactured by Mattery Cooperative, acrylic acid copolymer) 30.0 chalk (filler) 10.0 Polymekon 1488 (Antifoam) 0.3 ethylene glycol 3.0 concentrated aqueous ammonium hydroxide solution 4.0 Rohagit SA15 (product of Rohm German company, thickener) 5.0 water 35.0 Preventol A3 {a Bayer Federal Product, Mold Additive) 0.3

After impregnation, the fabric is passed between two rubber rollers to squeeze excess impregnation bath. The fabric is then passed through a drying oven having a temperature of 145-175 ° C and a residence time of 4 minutes.

The resulting impregnated and dried fabric is finally subjected to wind-controlled winding to obtain a 1500 m bale.

The main characteristics of the resulting lattice product are as follows:

tensile strength: 350 N / 5 cm elongation at break: 28% linear dimensional change (after heat treatment at 80 ° C for 6 hours): less than 1%.

For example, a roof lining film can be formed by thermoplastic laminating the exemplary lattice product between two 80 μm PVC films.

Example 2

The fabric was prepared according to the method described in Example 1, but with the difference that 2 to 2540 dtex fiber is stitched into the linen, while the weft fiber used is 1500 dtex monofil polyester fiber from Hoechst Germany. This produces 2160 dtex yarn in the chain.

The tissue thus obtained was impregnated as described in Example 1 in a bath of the following composition:

Component_Weight (g)

Solvic 376 NC (Low Softening Emulsion PVC, a product of the Belgian company Solvay 70

Ongrovil S160 (Low Softening Micro-Suspension PVC, a product of BVK) 30

Eviplast 79 (Phthalic ester of 7 to 9 carbon oxoalcohols, manufactured by the United Chemicals) 50 diisodecyl phthalate 30

Ongrostab BKZ21 (stabilizer, product of BCK) 2

Mironol 410 (product of Stockhausan Germany, viscosity reducing and stabilizing agent) 4

After impregnation, the fabric is passed through rubber rollers as described in Example 1, and then dried or gelled in a 175 ° C oven for 5 minutes.

The impregnated and dried fabric is then wound into a 1500 m bale as described in Example 1.

HU 199913 A

The resulting lattice product has the following characteristics:

tensile strength 1000/950 N / 5 cm elongation at break 20% (length);

15% (transverse) 5 linear size changes (under the conditions of Example 1): less than 1%.

For example, the grid-like product is thermoplastically castrated between two 0.3 mm PVC films to provide a material which can be used, for example, to form a flexible mining pipe, truck cover or waterproofing material for reservoirs.

Example 3

All of the procedures described in Example 2 were followed except that the following impregnation bath was used:

Component ___ Weight (g)

Solvic 550 GA 20 (emulsion PVC, a Solvay is a Belgian company products) Paraloid K120N {a Product of Röhm, Germany, acrylic acid 6.5 25 -ester) 3.5 butanone 40.0 ethyl acetate 40.0 petrol 10.0 3Q

The product thus obtained has the same physical characteristics and uses as the product of Example 2.

The main advantages of the process according to the invention can be summarized as follows. 35

1) The process according to the invention provides a lattice or mesh product having properties suitable for a variety of applications.

2) The process according to the invention does not require special, complicated and expensive target machines, but can be carried out with essentially conventional textile and impregnation equipment.

3) Immediately after weaving, impregnate, dry and roll. This is a very economical, productive and network stable procedure.

4) Few fibers, depending on the fiber quality - textured or blended fiber - can be made into a highly impregnable, stable mesh product with good physical parameters. The web-based finished product is very advantageous because of the cost-effectiveness of the net making and the extremely low technology of the finished product.

Claims (2)

PATENT CLAIMS CLAIMS 1. A method of producing a lattice or lattice web product of a synthetic fiber material, comprising forming a fiber-reinforced filament by dreher-weaving the bonded synthetic fibers while twisting the lower and upper warp yarns and the same warp in weaving, monofilament is used as the weft, and the fabric coming out of the loom immediately after weaving with a polymer solution containing 30 to 70% by weight of acrylic acid copolymer or 20 to 70% by weight. impregnated with low plasticizer PVC plasticisol, heat-treated at a temperature of 80-180 ° C and then wound using a peripheral drive. 2. A process according to claim 1 wherein the synthetic fiber is polyamide or polyester fiber.