MXPA06009285A - Method of producing a nonwoven material - Google Patents

Abstract

A method of producing a patterned and/or apertured nonwoven material wherein a web of continuous filaments (11) are formed on a forming member (12), the continuous filaments being free from each other without any thermal or adhesive bonds therebetween, and applying a wetformed fiber dispersion containing natural fibers and/or synthetic or regenerated staple fibers (13) on top of said synthetic filaments. The web is hydroentangled, from the side on which the natural fibers and/or staple fibers (13) are applied, in two subsequent hydroentangling stations (16;18) and is between said hydroentangling stations transferred from a first hydroentangling wire (12) having amesh value of at least 20 mesh/cm, to a second hydroentangling wire (17), having a mesh value of no more than 15 mesh/cm. A nonwoven material is obtained having one side with predominantly continuous filaments and one side with predominantly natural fibers and/or synthetic staple fibers, wherein the material on the side with predominantly natural fibers and/or synthetic staple fibers (13) has a three-dimensionally patterned structure and that natural fibers and/or synthetic staple fibers are penetrating into the layer of continuous filaments (11) and are protruding through the layer of continuous filament.

Description

METHOD FOR PRACTICE AN MATERIAL ÜO TISSUE Field of the Invention The present invention relates to a method for producing a non-woven material comprising a fibrous web of continuous filaments and natural fibers and / or synthetic staple fibers, and subsequently hydroreamed to the fibrous web as long as it is supported by a matting member.

Technical background The idroenmarañad © or ice cream by spinning is a technique introduced during the 1970s, see for example the document CA 841, 938. The method involves forming a weft of fiber that is laid in the air or laid wet, after which the fibers are entangled by means of jets of thin, high pressure under high pressure. Several rows of water jets are directed against the fiber web which is supported by a matting member in the form of a moving wire or a perforated rotating drum. The matted fiber web is then dried. The fibers which are used in the material can be synthetic or regenerated staple fibers, for example polyester, polypropylene, rayon or the like, pulp fibers or blends of pulp fibers and synthetic staple fibers. Spun yarn fabrics can be be produced with high quality at a reasonable cost and have high absorption capacity. They can be used for example as cleaning material for domestic or industrial use, as disposable materials in medical care and for hygiene purposes, etc. Through EP-B-333,211 and EP-B-333,228 it is known as hydroentangling a fiber mixture in which one type of the fibers is meltblown fibers. The polymers used for the continuous filaments are mainly chicken-olefins, especially polypropylene and polyethylene, or polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride etc. The base material, i.e. the fibrous material which is exerted for the matted material, consists of at least two preformed fibrous layers, wherein one layer is composed of melt blown fibers or of a "shaped material", in which an essentially homogeneous mixture of melt blown fibers and other fibers is laid on air on a wire. It is known from EP-A-308,320 to assemble a web of continuous filaments bonded with a fibrous material stretched in broth containing pulp fibers and staple fibers. The fibrous webs formed separately are hydroeprobe together to form a laminate. In said material the fibers of different fibrous webs will not be well integrated with each other since the continuous fibers are pre-treated. This pre-agglutination of the continuous filament will limit the mobility during the procedure and will therefore result in a material with limited integration. Through WO 92/08834 it is known that the staple fibers laid in the air on a forming wire on a forming wire and on the upper part thereof defibrated pulped fibers stretched to the air. The formed fibrous web is then subjected to three stages of hydroentanglement. In the first stage the web is hydroentangled against a fine mesh wire and then transferred to a coarse mesh screen on which it is exerted towards a second hydroentangling. In this second hydroentangling stage the water jets will press the loose fiber ends through the thick meshes in the wire. The web is then transferred to a third fine-mesh, hydroentangled wire a third time in order to ensure that the loose fiber ends will be folded against the fine mesh wire and will be entangled and firmly secured to the web. It is said that this produces a spunbond material that has a high wear resistance. From US Pat. No. 5,459,912 it is known how to make spunbond materials with pattern comprising fibers of wood pulp and synthetic fibers. The synthetic fibers may be in the form of textile staple fibers or spunbond fibers. Spunbond fibers are in the form of a filament spinning web, which means that the filaments are thermally bonded together and can not move and integrate with the other fibers during the spinning. WO 99/20821 discloses a method for making a composite nonwoven material, wherein fibers and a web of continuous filaments, such as a spunbond or meltblown web, are fabricated, a bonding material is applied to the plot, which is subsequently creped. Again the continuous filament web is a web where the filaments are bonded together. It is known from EP-B-938,601 to unite a web of continuous filaments with fibrous material formed into foam containing pulp fibers and synthetic staple fibers. The resulting web is then hydroentangled together with a composite material in a wetted stage. The continuous filaments are substantially free from each other before the hydroentanglement and the resulting material will show an integration between the material formed of foam and the continuous filaments. However, there is an opportunity for improvements especially with respect to hydroentangling materials having a patterned structure and / or with openings and a good integration between the continuous filaments and other fibers contained in the weft.

Brief Description of the Invention The object of the present invention is to provide a method for making a non-woven, non-woven material comprising continuous filaments and natural fibers and / or synthetic staple fibers, in which the continuous filaments are well integrated with the other fibers and the material has a structure with pattern and / or openings. This has been obtained according to the invention by forming a web of continuous filaments on a forming member, the continuous filaments that are free of each other without any thermal bond or adhesive between them, and applying a dispersion of fiber formed in wet containing natural fibers and / or synthetic fibers or regenerated in the upper part of said synthetic filaments, thereby forming a fibrous web containing said continuous filaments and natural fibers and / or staple fibers and subsequently hydroentangling the fibrous web, the web during the hydrophoretic which is supported by a first entangling member, wherein the fibrous web is hydroentangled, from the side on which the natural fibers and / or staple fibers are applied, in two subsequent hydroentanglement stations and is between the stations of scratched hydroin transferred from the first entangled member to a second my entangled embroider, wherein the first entanglement member has a mesh value of at least 20 mall / cm and the second entanglement member has a mesh value of not more than 15 maila / c. After the second hydrogen peroxide station the screen is dried without additional hydroentangling. According to one aspect of the invention no hydroentangling of the fibrous web takes place from the side on which the continuous filaments are applied. According to one embodiment, the natural fibers and / or synthetic staple fibers are deposited at the top of a web of continuous filaments. According to an additional embodiment, the natural fibers and / or the synthetic staple fibers are applied in the form of a wet or foamed fiber dispersion on top of the continuous filaments. In an aspect of the invention the first matting wire has a mesh value of at least 30 mesh / cm, preferably a mesh value between 30 and 50 alla / cm. In addition it may have a title value of at least 17, preferably of at least 23 title / cm, and more preferably has a title value between 23 and 35 trtulo / em. In a further aspect of the invention, the second matting wire has a mesh value of not more than 12 mesh / cm, preferably no more than 10 mm / cm and less than 10 mesh / cm. most preferable mode has a mesh value between 6 and 1.0 maKa c. The second matting wire can also have a titer value of no more than 15, preferably no more than 12, more preferably no more than 11, and most preferably a titer value between 6 and 1. 1 title / cm. In one embodiment the continuous filaments are spunbond filaments.

In a further embodiment the fibrous web comprises between 0.5 and 50% by weight, preferably between 15 and 30% by weight, of continuous filaments. In one aspect of the invention the fibrous web comprises between 20 and 85% by weight, preferably between 40 and 75% by weight of natural fibers. The natural fibers according to one embodiment are pulp fibers. In a further aspect of the invention the fibrous web comprises between 5 and 50% by weight, preferably between 5 and 20% by weight of synthetic or regenerated staple fibers. According to one embodiment, at least one main part of the synthetic staple fibers has a fiber length between 3 and 7 mm. In accordance with the aspect of the invention, openings are formed in the fibrous web in the second season of matting.

Description of the drawings The invention will now be described more narrowly with reference to a mode shown in the accompanying drawings. Figure 1 schematically shows one embodiment of a process for producing a material n > or hydroentangled fabric according to the invention. Figures 2-4 show ESEM images of a nonwoven material produced according to the invention.

Description of the modalities The hydrocarbon composite material according to the invention comprises a mixture of continuous filaments and natural fibers and / or synthetic staple fibers. These different types of fibers are defined as follows.

Continuous filaments The continuous filaments are fibers that in proportion to their diameter are very long, in principle without end. They can be produced by extrusion of a molten thermoplastic polymer through fine nozzles, after which the polymer will be cooled and extracted, preferably by the action of a flow of air blown at one end along the polymer streams, and solidified into strands that can be treated by extraction, stretch © folded. Chemical agents can be added to the surface for additional functions. The filaments may also be regenerated fibers produced through the chemical reaction of a solution of fiber-forming reagents entering a reaction medium, for example by spinning regenerated cellulose fibers from a solution of xantat® from cellulose into acid suifúF? eo. Examples of regenerated cellulose fibers are rayon, viscose or lyocell fibers. The continuous filaments may be in the form of spunbond filaments or meltblown filaments. The spunbond filaments are produced by extruding a molten polymer, cooled and stretched to an appropriate diameter. The fiber diameter is usually more than 10 μm, for example between 10 and 100 μm. The production of spunbond filaments is described, for example, in U.S. Patents 4,813,864 and 5,545,371. The meltblown filaments are formed by means of meltblowing equipment 10, for example of the type shown in the United States of America Molecular Patents 3,849,241 or 4,048,364. In summary the method involves that a molten polymer is extruded through a nozzle in very fine streams and converging air currents are directed towards the polymer streams so that they are extracted in the continuous filaments with a very small diameter. The filaments can be microfibers or macrofibres depending on their size. The microfibers have a diameter of more than 20 μm, although they are usually in the range between 2 and 12 μ in diameter. The macrofibers have a diameter of more than 20 μ, for example between 20 and 100 μm. All thermoplastic polymers can in principle be used to produce spunbond filaments and single filaments. Examples of useful polymers are polyolefins, such as polyethylene and polypropylene, polyamides, polyesters and polylactides. Of course, copolymers of these polymers can also be used. Bast is another type of filament, which is usually the starting material in the production of staple fibers, although it is also sold and used as a product by itself. In the same way as in the production of spinning fibers by spinning, the tow is produced from thin streams of pofimer that are extracted and stretched, but instead of being laid on a moving surface to form a weft, they are maintained. in a beam to finish the extraction and stretching. When staple fibers are produced, this bundle of filaments is treated with chemical spin finishing agents, are often bent and then fed into a cutting stage where a wheel with blades will cut the filaments in different lengths of fiber that They are packaged in bales to be shipped and used as staple fibers. When tow is produced, the filament bundles are packaged, with or without chemical finishing agents, in bales or boxes. The continuous filaments will be described below as fibers spun by hiatus, although it is understood that also other types of continuous filamentsFor example, meltblown fibers can be used. Preferably, the spunbond filaments are used, since they result in a stronger material. In this case it is an advantage to have stronger spunbond filaments, since they resist the mechanical agitation exerted by the water jets. The spunbond filaments are easily movable by the action of the water jets and will create patterns and openings in the weft material. The meltblown filaments plus debites may break during hydroentanglement.

Natural fibers Natural fibers are usually cellulose fibers, such as pulp fibers or fibers from grass or straw. Pulp fibers are the most commonly used natural fibers and are used in the material for their tendency to absorb water and for their tendency to create a coherent sheet. Both coniferous wood fibers and hardwood fibers are suitable, and recycled fibers can also be used, as well as combinations of these types of fibers. The fiber lengths will vary from approximately 2-3 mm for coniferous wood fibers and approximately 1- 1.5 mro for hardwood fibers, and even shorter for recycled fibers.

Flashes cut The staple fibers used can be produced from the same substances and through the same processes as the filaments described above. They can be synthetic fibers or regenerated cellulose fibers, such as rayon, viscose or lyocell. The cutting of the fiber bundles is executed in a normal way in a single length of cut, which can be altered by varying the distances between the blades of the cutting wheel. The fiber lengths of the conventional wet-laid hydro-spun-bonded nonwovens are usually in the range of 12-18 mm. However, shorter fiber lengths, from about 2-3 mm, can also be employed according to the present invention.

The process According to the embodiment shown in FIG. 1, the continuous filaments 11 in the form of spunbond fibers are produced by extrusion of a molten polymer, cooled and stretched to an appropriate diameter. The fiber diameter is usually above about 10 μ, for example between 10 and 100 μ. In an alternative embodiment, meltblown fibers are formed by means of melt-blown equipment. The meltblowing technique involves, in short, that a molten polymer is extracted through a nozzle in very fine streams and converging air streams are directed towards the polymer streams so that they are extracted in continuous filaments with a very small diameter.

The fibers can be microfibers or macrofibers depending on their size. Membrane fibers have a diameter of more than 20 μm, although they are usually in the range between 2 and 12 μ in diameter. The macrofibers have a diameter of more than 20 μm, for example between 20 and 100 μm. All thermoplastic polymers can in principle be used to produce spunbond fibers and meltblown fibers. Examples of useful polymers are polyolefins, such as polyethylene and polypropylene, polyamides, polyesters and polylactides. Of course, copolymers of these polymers can also be used. According to the embodiment shown in FIG. 1, the spin-spun fibers 11 are laid directly on a forming wire 12 where they are allowed to form an open, relatively loose weft structure in which the fibers are relatively free. of the others. This is achieved by making the distance between the spinning nozzle and the wire relatively large, so that the filaments are allowed to cool before they are laid on the wire 12. The basis weight of the spinning layer formed will be between 2 and 50 g / m2 and the volume between 5 and 15 cm3 / g. An aqueous or foamed fibrous dispersion 13 from a head box 14 is laid on top of the spunbond filaments. In the wet laying technique the fibers are dispersed in water, with optional additives, and the fiber dispersion is dried on a forming fabric to form a fibrous web laid wet. In the foam forming technique, which is a special variant of wet laying, a fibrous web is formed from a dispersion of fibers in a foamed liquid containing water and a surfactant. The foaming technique is? Ectite for example in ßB 1,329, 409, US 4,443,297, WO 98/02701 and EP-A-0 938 601. A fibrous web formed with foam has very uniform fiber formation. For a more detailed description of the foaming technique reference is made to the documents mentioned above.

The spunbond filaments and the fiber dispersion of natural fibers and smcotic fiber fibers can be formed on the same or different wires. The web of spunbond filaments laid on the wire 12 has a rather low base weight and substantially is not bonded, which means that the web is very weak and has to be handled and transferred to the next forming station, the 14 head box, very gently. In order to provide a certain consolidation of the spinning filament weft and to prevent the weft from damaging in its course towards the head box, the humidity according to one embodiment of the invention is applied to the weft by means of a bar. spraying 15 or soft spraying before laying the fiber dispersion formed wet or with foam on the web of the continuous filaments. By this the continuous filament web is flattened and a firm contact is established between the web and the forming wire before it enters the headbox area, in which the fiber dispersion formed in wet or with foam it is laid on top of the continuous filament web. The wetting of the filaments takes place at low pressure so that there is no substantial aggradation or lateral displacement of the fibers. The surface tension of the water will adhere the fitaments to the wire so that the formation will not distort as it enters the head box. The term "without substantial agtutinism" as used herein means that there will be no substantial agglutination effect in addition to that which is caused by the surface tension of the liquid used. In some cases, when the hydrophobic polymers are used for the formation of spunbond filaments, a small amount of a surfactant, between 0.001 and 0.1% by weight, can be added to the water used to wet the spun filaments. spinning Fibers of many different kinds and in different mixing ratios may be used to make the fibrous web stretched wet or formed with foam. It is therefore possible to use pulp fibers or blends of pulp fibers and synthetic staple fibers, for example potassium, polypropylene, rayon, cellulose, etc. Variable fiber lengths can be employed. However, according to the invention, it is advantageous to use relatively small staple fibers, below 10 mm, preferably in the range of 2 to 8 mm and more preferably 3 to 7 mm. This is an advantage for some applications because the small fibers will mix and integrate more easily with the filaments spun by spinning than the larger fibers. There will also be more fiber ends extending from the material, which increases the softness and textile feel of the material. For small staple fibers, air laying or foaming techniques can be used. As a substitute for pulp fibers other natural fibers can be used with a short length, for example esparto grass, phalaris arundinacea and straw from crop seed. It is preferred that the fibrous web comprises at least between 20 and 85% by weight, preferably between 40 and 75% by weight of natural fibers, for example pulp fibers. It is further preferred that the fibrous web contain between 10 and 50% by weight, preferably between 15 and 30% by weight, of continuous filaments, for example in the form of spunbond filaments or meltblown filaments. The fiber dispersion lying on top of the spunbond filaments is dried through suction boxes (not shown) placed under the wire 12. The small pulp fibers and the synthetic staple fibers are formed on the upper part of the fiber. the spun-spinning weft, which provides the necessary narrowness and acts as an extra sieve for the formation of short fibers.

The thus formed fibrous web comprising spunbond filaments and other fibers is then brazed in a first entangling station 16 which includes several rows of nozzles, from the very thin jets of water under high pressure directed against the fibrous web. In the embodiment shown, the same wire 12 is used to hold the weft in the first entanglement station 16 for the formation of the weft. Alternatively, the fibrous web before being hydroentangled can be transferred to a special mat wire. In both cases the web is entangled from the natural / cut fiber side in order to obtain a penetration of the natural short fibers / staple fibers into the filament web. The wire or screen 12 that holds the weft in the first stage of hydroentangling is relatively thin mesh, at least 20 maila / cm and preferably at least 30 mesh / cm. More preferably, the wire supporting the web in the first hydroentangling station has a mesh value between 30 and 50 mesh / cm. For a woven wire mesh vator is defined in The present is the monofilament strand number in the warp direction of the wire. The wire 12 can be woven wire or other fluid permeable screen member adapted to support a fibrous web during the wetted wire. An example of such a screen is a narrow mesh screen molded of thermoplastic material as described in WO 01/88261. The mesh number is defined in this case as the number of strands of the thermoplastic material that extend between the screen openings in the machine direction. A similar definition is given to the mesh value for other types of sieves adapted for hydroentangling. The wire also has a titer of at least 17 and preferably at least 23 titer / c. More preferably, it has a titre value between 23 and 35 titer / cm. For a woven wire the value of t? O is defined as the number of monofilament strands in the weft direction per cm of the wire. For other types of screens that are not woven wires, the title value is defined as the number of strands of material that extend between the screen openings in the transverse direction. After the first hydroentanglement station the raster is transferred to a second wire or hydroentangling sieve 17, which holds the fibrous web in a second hydroentangling station 18 which includes several nozzle phytas, from which water jets very Fine under high pressure are directed against the fibrous web. The hydroentangling takes place from the same side of the fibrous web as in the first hydroentangled station, ie from the natural fiber / cut side. The wire or screen 17 used in the second hydroentangling stage is relatively thick and has a mesh value of no more than 15, preferably no more than 12 and more preferably no more than 10 mesh / cm. More preferably, the wire 17 has a mesh value between 6 and 19 mesh / cm. The mesh value is defined for woven wires and for the other sieves as before. The wire or sieve 17 further has a titre value, as defined above, of no more than 15, preferably no more than 12 titre / cm and preferably no more than 11. More preferably it has one vator of title between 6 and 11 title / cm. It is important that the filaments are relatively unglutinated and detached after the first hydroentangling stage, in order to allow a certain rearrangement and mobility of the fibers and filaments in the second hydroentangling station 18 by means of the action of the water jets. . This will create a good penetration of the natural short fibers / fibers cut within the filament web and therefore a good integration of the fibers and filaments. Due to the relatively thick wire or sieve 17, a pattern forming effect and even the creation of openings in the fibrous material in the second hydroentangling station 18 are obtained. In a preferred embodiment, a woven wire is used at least in the second stage. of hydroentangled, since a woven wire normally has a more pronounced three-dimensional structure compared to a sieve of another type. The fibrous webs having a three-dimensional pattern structure and / or openings have certain advantages for example when used as a cleaning material, since they provide an improved cleaning effect especially for viscous substances and particles. After hydroentangling the material 17 is dried and rolled. The material is then covered in a known manner for a suitable format and is packaged. Since it is preferred to have narrow cycles of process water as far as possible, water that has been dried out in the formation, wetting and hydroentanglement stages is preferably recircuted.

Example A hydroentangled fibrous web containing a combination of spunbond filaments and pulp fibers was produced. The following ratio of filaments and fibers was used: 25% by weight of spunbond filaments, PP 3 dtex; 75% by weight of pulp fibers. The pulp fibers were supplied by wet laying. The fibrous web was hydroentangled in a first hydroentangling station while it is supported on a Flex 310 K wire supplied by Aibany International, which has a malt value of 41 and a titre value of 30.5 per cm. The energy input in the first hydroentangling stage was relatively low, approximately 100 k / t. The first hydroentangling station comprised 1 row of nozzles with a pressure of 79 bar x 79 bar). The frame was fed through the first station at a speed of 24 m / min. The web was subsequently hydroentangled in a second hydroentangling station while held in a Combo 213 B wire supplied by Atbany International having a mesh of 9 and a titer of 10 per cm. The second hydroentangling station comprised 3 nozzle phytas with a pressure of 100 bar (3 x 100 bar). The frame was fed through the second station of steam at a speed of 144 m / min and the power input at the second hydroentangling station was 80 k / t. The resulting material had a thickness of 799 μ, a grammage of 86.7 g / m2 and a volume of 9.2 g / m3. The ESEfiA images of the material are shown in Figures 2-4, where Figure 2 shows a cross section through the material in a magnification of 200x. Figure 3 shows the material in a 65x magnification from the pulp fiber / cut fiber side and Figure 4 shows the material in a 65x magnification from the spunbond side of the filament. The spunbond filaments are designated by number 11 and the shorter pulp fibers / staple fibers are denoted by number 13. It can be seen from the images that the material has a different three-dimensional structure as seen from the pulp fiber / fiber cut side, from which it has been hydroentangled. The openings 20 extending through the material have also been created which can be seen from Figures 3 and 4. Figures 1 and 2 further show that the pulp / staple fiber fibers have penetrated into and even through. of the spunbond filament web and are projecting from the spunbond side of the material. This indicates a good integration between the different types of fibers contained in the material. The mechanical properties of the material produced are shown in Table 1 below. The properties are satisfactory and show that the patterned material and openings according to the invention can be achieved without sacrificing other properties.

Table 1

Claims (17)

1. A method for producing a patterned and / or apertured nonwoven material comprising forming a web of continuous filaments on a forming member (12), the continuous filaments that are free from each other without thermal bonds or adhesives between them, and applying a fiber dispersion formed wet or with foam containing natural fibers and / or synthetic or regenerated staple fibers on top of said synthetic filaments, thereby forming a fibrous web containing said continuous filaments and natural fibers and / or staple fibers and subsequently hydroentangling the weft fibrous web during the hydroentanglement which is supported by a first entanglement member (12), characterized in that the fibrous web is hydroentangled, from the side on which the natural fibers are applied and / or staple fibers, in two subsequent hydroentanglement stations (16; 18) and is transferred between said stations of hydroentangling from the first entangling member (12) to a second entangling member (17), wherein said first entangling member has a mesh value of at least 20 mesh / cm and the second entangling member has a value of of mesh of not more than 15 mesh / cm, and that after the second hydroentangling station the screen is dried without additional hydroentanglement.

2. A method according to claim 1, characterized in that there is no hydroentangling of the fibrous web from the side on which the continuous filaments (11) are applied.

3. A method according to claim 1 or 2, characterized in that the natural fibers and / or the synthetic staple fibers are deposited at the top of a web of continuous filaments.

4. A method according to claim 3, characterized in that the natural fibers and / or the synthetic staple fibers are applied in the form of a fiber dispersion formed wet or with foam on top of the continuous filaments.

5. A method of compliance c &n any of the preceding claims, characterized in that the first entangling member (17) has a malt value of at least 30? T? Alla / cms preferably a mesh value between 30 and 50 mesh / cm. A method according to any one of the preceding claims, characterized in that the first entangling member 17) has a malt value of not more than 12 mesh / cm, preferably not more than 10 mesh / cm and more preferably preferable has a malt vatoF between 6 and 10 malia / cm. A method according to any of the preceding claims, characterized in that the first entangling member (17) has a titer value of at least 17, preferably of at least 23 titer / cm, and more preferably has a title value between 23 and 35 title / c. A method according to any of the preceding claims, characterized in that the second entangling member (17) has a titer value of not more than 15, preferably not more than 12, more preferably not more than 1 1 and most preferably has a title value between 6 and 1 1 title / cm. 9. A method according to any of the preceding claims, characterized in that at least the second entangling member (17) is a woven wire. 10. A method according to any of the preceding claims, characterized in that the continuous filaments are filaments spun by h? Tatefra. 11. A method according to any of the preceding claims, characterized in that the fibrous web comprises between 0.5 and 50% by weight, preferably between 15 and 30% by weight, of continuous filaments. 12. A method according to any of the preceding claims, characterized in that the fibrous web comprises between 20 and 85% by weight, preferably between 40 and 75% by weight of natural fibers. 13. A method according to claim 12, characterized in that the natural fibers are pulp fibers. A method according to any of the preceding claims, characterized in that the fibrous web comprises between 5 and 50% by weight, preferably between 5 and 20% by weight of synthetic or regenerated staple fibers. 15. A method according to claim 14, characterized in that at least one main part of the synthetic staple fibers has a fiber length between 3 and 7 mm. 1

6. A method according to any of the preceding claims, characterized in that the openings are formed in the fibrous web in the second matting station (18). 1

7. A hydroentangled nonwoven material comprising continuous filaments (11) and natural fibers and / or synthetic staple fibers (13), said material having one side with predominantly continuous filaments and one side with predominantly natural fibers and / or synthetic staple fibers , characterized in that the non-woven material on the side with predominantly natural fibers and / or synthetic staple fibers (13) has a three-dimensional structure with pattern structure and that the natural fibers and / or synthetic staple fibers are penetrating into the layer continuous filaments (11) and are protruding through the continuous filament layer. SUMMARY OF THE INVENTION A method for producing a nonwoven material with pattern and / or openings in which a continuous filament web (1 1) is formed on a forming member (12), the continuous filaments that are free of those without any thermal link or adhesive between them, and applying a wet-formed fiber dispersion containing natural fibers and / or synthetic or regenerated staple fibers (13) on top of said synthetic filaments. The web is hydroentangled from the side on which the natural fibers and / or staple fibers (13) are applied, in two subsequent hydroentanglement stations (16; 18) and is transferred between said hydroentangling stations from a first hydroentangled wire ( 12) having a mesh value of at least 20 mesh / cm, towards a second hydroentangled wire (17), having a mesh value of not more than 15 malia / cm. A non-woven material is obtained having one side with predominantly continuous filaments and one side with predominantly natural fibers and / or synthetic staple fibers, wherein the material on the side with predominantly natural fibers and / or synthetic staple fibers (13) has a structure with three-dimensional pattern and that the natural fibers and / or synthetic staple fibers are penetrating within the continuous filament layer (11) and are protruding through the continuous filament layer. &0