Perforated nonwoven material and method of its manufacture

 

(57) Abstract:

The invention relates to hygiene products, in particular to a perforated nonwoven material and method of its manufacturing. Material with a specific gravity of from 8 to 17 g/m2consists of intertwined continuous microfiber yarns with a linear density of from 0.05 to 0.40 decitex. Filaments composed of at least two thermoplastic polymers with different hydrophobicity. In cross-section fibers have the appearance of cells or hollow cells. Out of these threads are separated by splitting up the filament, and the perforation holes are made pure and free from split of filaments of the fiber. The method of obtaining the material is that split continuous fiber composed of at least two different thermoplastic polymers of different hydrophobicity, located in the cross section of the fibers in the form of alternating cells are placed in a non-woven material, split above of the fiber filament, and twist them with water jets under high pressure with the formation of twisted microfiber yarns and then perforined non-woven material with water jets under high pressure. The material according to of the Delilah to absorb secretions of the intestines, meets high opacity and higher softness and comfort side adjacent to the body replaces the two - and multi-layer materials and has a mass of fibrous material, which is significantly lower than the mass of modern perforated nonwoven materials currently used for the production of diapers and feminine sanitary pads. Improves the distribution of the secretions of the intestines without compromising the ability to absorb urine, provides for the passage of fluid through the perforated non-woven material without the use of surfactants and, therefore, reduces the relative content of surfactants commonly used in mass non-perforated protective non-woven material. 2 C. and 8 C.p. f-crystals, 5 tab., 6 Il.

The invention relates to hygiene products, in particular to a perforated nonwoven material and method of its manufacture.

Art

Hygienic products, absorbing a biological fluid, such as baby diaper, diapers for adults or female strip, typically include an absorbent inner portion (or layer), waterproof sealing of the lower substrate of a film or a laminate film/non-woven material and adjacent to tanesini in vacuum perforation in the form of a funnel, i.e., three-dimensional holes. The film, perforated vacuum surrounds the absorbent inner part, with the large holes facing outwards, i.e. to the body. Film made of a hydrophobic thermoplastic polymers such as polyethylene, polypropylene or a copolymer of ethylene and polyvinyl acetate and EVA. Due to this, the surface of the film with one side not wetted biological fluid, which is directed only to the absorbing inner part, and thanks to an internal funnel-shaped holes of the perforation reverse motion of the fluid is difficult, for example, when the load movement or squeezing. As is known, an absorbent inner layer along with the technical pulp usually contains overabsorbed particles (SAC). Overabsorbed polymers differ in that they are able to absorb large amounts of aqueous liquids and significant increase in the amount to form a gel mass with more or less low hardness. The presence of the SAC has the advantage that it allows to reduce the weight of the absorbent inner part and to reduce its thickness, and fluid under pressure is retained by the gel and does not drain out. However, the SAC have the disadvantage associated with the lock I meant this state, when the liquid cannot pass or move significantly slower. This problem is also solved by an appropriate design of shock-absorbing hygiene products. In this case, between the absorbent (inner) layer and protective coating) layer is placed voluminous non-woven material or other very open structures that are not blocked by contact with the liquid. This intermediate layer absorbs fluid instantly, i.e. spontaneously removes it from the surface of the diaper and distributes. This improves the distribution of the biological fluid. Under the distribution of biological fluid refers to the relationship many above have already partially mentioned factors, with the purpose of formation possibly the most comfortable feeling when using hygienic products.

It is known that as the surface facing the body of the layer of absorbent material is also used non-perforated non-woven material obtained in the process of forming fibers, and nonwoven staple fiber-based polyolefins.

Development of means for holding fluid, urine in children's diapers, diapers for adults and menstrie diaper should keep an optimal way to not only urine, but liquid discharge from the intestines. Non-perforated non-woven protective materials for this purpose are unsuitable. This biological fluid is a multiphase system comprising solid particles of different shape and texture with a tendency to separation of the phases primarily on the active surface or surfaces with a filter or precipitating property. These fluids are referred to below as the selection of the intestine. It turned out that non-perforated non-woven materials are unsuitable because they are not able to fully pass through the liquid discharge of the intestine, so that they fell into the absorbent inner part. On the contrary, there is a tendency of sedimentation of solid and/or highly viscous components of the secretions of the intestines on the outside of the diaper due to the separation, and in some cases, such solid and viscous components act as a barrier layer for the incoming biological fluid flowable consistency. As the separation of major components, and the associated block transfer fluid are a significant disadvantage of conventional diaper. Therefore, numerous suggestions improved the layer (protective non-woven material). While the perforation holes must be clean (free section). Cross-connecting the individual fibers or groups of fibers or the presence of any fiber jumper is undesirable. In addition to the perforated upper layers, in accordance with a special texture and related features of the liquid secretions of the intestines should also lead the design of the diaper and the configuration of the nonwoven material of the open structure located between the protective layer of non-woven fabric and absorbent inner part.

There are many ways of applying perforations and nonwovens and composites of nonwoven materials. In European application EP-A-0215684 described a method of creating a perforation in nonwovens using a water jet. As the basis for placement of the fibers and the processing of their jets of water do not use a regular strainer, and perforated cylinder, provided with protuberances. This device ensures the application of a clear perforation. In U.S. patent 5628097 described another method of applying a perforation and other perforated products, according to which the non-woven material to form grooves in the longitudinal direction by means of ultrasound and is, consisting of two nested into each other corrugated rolls. Thanks to sever proflavine grooves and open the perforation holes. Described non-woven fabrics of staple fibers and continuous filaments, fibrous nonwoven materials produced by the aerodynamic method from the melt (melt blown), and multilayer non-woven fabrics of staple fiber and blow continuous filaments, which are indicated, for example, as SM (composite, made spunbond method/aerodynamic method from the melt) and SMS (composite, made spunbond method/aerodynamic method from the melt/spunbond method).

Perforated nonwoven for hygiene purposes should not only distribute the allocation of the intestine, but to have the highest possible degree of whiteness or high protective ability and very good softness, at least adjacent to the body side. It is known that the last two properties depend on the elasticity and softness themselves used fibers. And this relationship is the higher the lower linear density of the fiber, thus, it is proposed to use a thin, thin and ultra-thin fibers. Ultrathin fibers in the materials are also composed of microfibers size of about 1-10 microns.

Famous baby diaper production company Unicharm, covered with a perforated nonwoven material, which is manufactured by the aforementioned method water jet perforation and consists of a composite material PP/PE (polypropylene/polyethylene) made spunbond method, and the resulting aerodynamic method from the melt layer PP. Indeed, thanks to this multi-layered structure made some contribution to improving the distribution of the secretions of the intestines, achieved the softness blow molding composite (on the side adjacent to the body) and high protective properties. However, these multi-layer structures and methods for their manufacture are significant disadvantages. The obtained aerodynamic method (from melt blown) layer does not make any contribution or makes a minor contribution to the overall strength, respectively, of the total structural integrity. The mass of the components is above the generally accepted level for today. Reducing weight to values lower than about 30 g/m2in connection with high strength requirements in the direction of travel of the machine for the manufacture of diaper material is impossible. High material consumption leads to higher prices of products. Wydown is sustained fashion thermally attached to the substrate in a multilayer non-woven material to prevent the tendency to stratification. This requires a two-component fiber (conjugated fiber) with concentric or eccentric location of the protective component of the low-melting polymer as a layer obtained by the aerodynamic method. However, this perforated multilayer material SM on the soft side M is considerably inferior in wear made spunbond method PP materials or pressed non-woven materials of PP staple fibers, which are currently used for diapers and feminine sanitary pads. In products other purposes, such as diapers or nonwovens ERS that require wear resistance, therefore the absence of cotton, you can only use SMS. With this coating is blown layer side adjacent to the body, the advantage blown layer is rendered useless.

In U.S. patent 4840829 described nonwoven fabric with a unit weight of the surface in the range from 10 to 150 g/m2that are made from staple fibers ranging in length from 20 to 100 mm and a linear density in the range from 0,555 to 16,65 decitex. These nonwovens are round or elliptical holes, which are produced using water-jet processing on the substrate with vystuplenie, moreover, these materials consist of multicomponent filaments, which upon hardening them in a non-woven material is divided into separate components of their threads and weave twisting.

The invention

The present invention is the creation of a perforated nonwoven material, superior in its characteristics of non-woven materials used to present the products to absorb secretions of the intestines, satisfying the requirements of high opacity and higher softness and comfort side adjacent to the body, replacing two - and multi-layer materials and having a mass of fibrous material, which is significantly lower than the mass of modern perforated nonwoven materials currently used for the production of diapers and feminine sanitary pads.

Another object of the invention is the improved distribution of the secretions of the intestines without compromising the ability to absorb urine.

The next task of the present invention is the provision of fluid passing through the perforated non-woven material without the use of surfactants and, accordingly, decrease of the relative content of surfactants in usually ispolzuemaya by creating a perforated nonwoven material with a specific gravity of from 7 to 25 g/m2from intertwined continuous (here and hereinafter, the term "continuous filament" refers to a filament (fiber), not cut and not torn to pieces unlike staple fibres) microbolometer yarns with a linear density in the range from 0.05 to 0.40 decitex, which is composed of at least two thermoplastic polymers with different hydrophobicity with a cross-section in the form of cells or hollow cells, resembling the structure of the cake, from which is separated by cleavage of the filament, and the perforation holes is made perfect (in particular, have a clear outline) and do not contain any of filaments of fibers obtained by splitting microfiber yarns.

Despite the extremely low weight of the nonwoven material according to the invention has a very high strength and the low mass of fibers is characterized by a very clear structure of holes. This makes it possible to guarantee a high permeability to fluids, especially of the secretions of the intestines, in the absence of or with small additives of at least one surfactant with a low surface tension (wetting agents) and to perform the material in the form of dry coatings hygienic is nanou density in the above range. Preferably the perforation holes put regular (ordered), and the orifice is from 0.01 to 0.60 cm2.

Perforated nonwoven material according to the invention is preferably characterized by the fact that the time of passage of fluid through it is less than 3 seconds after one minute transmission fluid (or from the beginning of test). Limit load in the longitudinal direction is preferably at least 30 N/5 see Indicator reverse wetting is preferably less than 0.5 g

For the formation of non-woven materials can be used, for example, two different strands of thermoplastic polymers, taken in a mass ratio in the range from 20: 80 to 80:20. Below we discuss the formation of non-woven fibrous material on the basis of two elementary filaments F1 and F2.

In addition, the invention relates to a method for producing such perforated nonwoven materials by stacking split continuous fiber having a cross-section of at least two different thermoplastic polymer with different hydrophobicity, which are located in the cross section in the form of alternating cells (like cake), non-woven material, subsequent cleavage of nepreryvnyh thread and subsequent perforation formed material using water jets under high pressure.

This perforation is preferably carried out on the drums for water drainage and holes having a protuberance on the outer surface.

The following describes the polymers used for the manufacture of nonwoven material according to the invention, and then in more detail the method of manufacture.

At least one of the two polymer elementary fibers F1 and F2 is hydrophobic and is made preferably from a range of polyolefins, such as polyethylene, polypropylene and their copolymers, one of the polymers is in excess. The other polymer may be hydrophobic, and hydrophilic, but preferably not hydrophilic and weakly hydrophobic, such as polypropylene. In this case, F1 indicates a more hydrophobic polymer fiber, a F2 - less hydrophobic polymer fiber. F1 preferably consists of polypropylene (PP) or polyethylene (PE), or mixtures thereof. F2 can be, for example, a fiber from a number of polyesters such as polyethylene terephthalate, polybutylene terephthalate, polypropyleneimine or copolymer and PE. Regarding the selection of the polymer as F1 and F2 there are no restrictions, except that of the above polymer clay is by fiber.

Both F1 and F2, or one of them may consist of thermoplastic elastomers. An example of an elastic polyolefin for non-woven fabric obtained in the molding process of the fiber described in patent EP-A-0625221, and the sample catalyzed by metallocene LLDPE in the patent EP-A-0713546, which describes well as representatives slaboperemennykh elastomers, such as polyurethane, copolymer of ethylene-butylene copolymer poly(ethylene-butylene)styrene (Kraton), paediat-ester and the elastomer of the complex/simple polyester (Hytrel). For such elastomers is known that non-woven material obtained in the molding process of the fiber, it is possible to generate aerodynamic method from the melt or by using a combination of SMS (spunbond method/aerodynamic method from the melt/spunbond method). The introduction of such elastomer in the composition of F1 and/or F2 increases softness and elasticity perforated microfiber nonwovens. In addition, it was found that only perforated non-woven materials, which consist of twisted microfiber yarns (threads microfiber), have excellent properties in respect of transmission and distribution of liquid. Perforated non-woven fabrics of twisted Ah materials on the machine for the manufacture of the diaper (high traction load in the machine direction), their weight should increase on average three times compared to the non-woven material made of continuous fibers, with the obvious loss of quality perforation, elasticity, softness, durability and capacity for transmission and distribution of fluid.

In addition, the melt polymer fibers in the form of masterbatches can be added components to impart antistatic properties, dyeing chemical fibers in the spinning process, matting, softness, stickiness and elasticity, improving and reducing the protective properties of liquids (such as water, alcohol, hydrocarbons, oils, fats and polydisperse systems, such as the selection of the intestine, and other liquid secretions, such as urine and menstrual flow.

Components that modify the surface tension on the outer surface of the microfibers (phase boundary) can also be applied subsequently after the formation or selection of microfiber yarns already perforated non-woven material. Examples of such substances are wetting agents in the form of an aqueous solution or dispersion, which currently add to many nonwovens used as protective (top) layer of the diaper, with the aim of improving the passage of urine through them.

However, the nonwoven material of the present invention is preferably obtained without EXT is quality. The nature of the perforation, i.e., the size of the holes, the shape, the location of the individual holes relative to each other (for example, in the interval or row) and open the plane with one hand, and extremely high elasticity of the bridge (the area between the holes), consisting of interlaced continuous microfiber yarns, and very low weight allow to reduce the addition of wetting agents or completely eliminate them.

List of figures and other materials

The invention further clarify the drawings shown in Figures 1-6.

In Fig. 1-6 shows the form of individual openings K and their location on the plane.

In Fig. 1 the letter K is an idealized hole in the shape of an equilateral hexagons, where party a and b are equal. Distance means the shortest distance between centre holes K and face and. Faces a and b are in each case at a constant distance g from any adjacent hole K. Around each hole K in each case shows large equilateral hexagons with sides e and f parallel to a and b. In Fig.1 e= f. So get cell location hole K. the Faces a and b holes K in each of the Anya "and" with "and" and "a" with "b" in the non-woven material present in rounded form. These rounded edges i and j shown in Fig.1 for the case i=j. These curves the initial distance d, and e hexagon reduced to q and r. In Fig.1 q=r.

In Fig. 2 shows that all the curves i and j in the limiting case can be extended so that the hole K takes the form of a circle.

In Fig. 3 holes K differ from the holes shown in Fig.1, except that b significantly more and and rounding i was stronger than j.

In Fig. 4 shows that in the limiting case of rounding i and j can be extended so that the hexagon K takes the form of an ellipse.

In Fig.5 and Fig.6 shows other possible types of location holes.

Information confirming the possibility of carrying out the invention

It turned out that the hexagonal shape of holes (pores) K or form, which is formed by the rounding, and the location of the holes, as shown in Fig. 1-4, are preferred for liquid distribution. It is in the case of an equilateral hexagonal holes K and rounded variants liquid body always has the shortest path from the surface of the diaper to the inner layer.

However, the invention is not limited techgene options and also the irregular distribution of these and other holes. Less fit these holes and their location, which hinder part of the released fluid, very remote from the edge of the hole, quickly pass through the pores K.

This arrangement of the holes is represented, for example, in Fig.5 and Fig.6.

The distance from the furthest point in w to a rounded corner of the quadrangle is significantly greater than the distance h.

The ratio u/h, i.e. the maximum distance on the surface to the hole K to the minimum distance, in the ideal case should be 1:1, and in the least favorable case is 2:1.

The area of the individual holes is in the range from 0.01 to 0.60 cm2preferably from 0.04 to 0.40 cm2. All the individual holes may have the same shape and the same holes have the same size. Both openings or only one of the two may vary, but the above explanation refers only to the ratio u/h less than/equal to 2:1.

The open area of the holes is in the range from 8 to 40%, preferably from 12 to 35%.

Super fine grain twisted continuous filament's form around the holes of the frame L. the Punch is defined wettability or residual hydrophilic. These compounds should be included after the water-jet punching way wet. Make the number ranges from 0 to 0.60 wt.% in calculating the masses of non-woven material, preferably between 0 and 0.20%. Their quantity is calculated considering the area of the individual holes and the total open area. More than the specified area, the more can be reduced content of such surfactants. Considerations of optimal bioterrorist content of at least one surfactant seek to reduce to 0%.

A particular advantage is that the surfactant can be distributed not uniformly throughout the structure of the material, and in close proximity to the periphery of the holes. From this place the substance is forcibly supplied to the holes providing fluid inward suction action. Polydisperse liquid system is not subjected to dehydration, and, accordingly, does not occur phase separation. Prevents plugging of holes and the emergence of sediment throughout the structure of the material. Receiving and distributing the liquid layer located between the absorbent inner layer and the upper layer and which is wettable further contributes neurula (upper layer)

The method according to the invention is that the split fiber honeycomb structure having a cross-section in the form of cells or hollow cells, with the help of technology education nonwoven materials in the molding process, the fiber is placed in a non-woven fabric composed of continuous filaments. In the cross-section of the filaments emerging from the Spinneret in unsplit condition, consist of two different polymer components F1 and F2, which are alternately adjacent to each other in separate cells like pieces of cake (usually fiber is composed of 4-16 such cells). As a condition subsequent cleavage should preferably several (in most cases two such widely differing chemical properties of polymeric components on a common boundary surface have as low as possible adhesion. In addition, you can use similar chemical properties of the polymer components, for example, such as polyethylene terephthalate and copolyester or polypropylene and polyethylene, if we take measures to reduce adhesion on the common boundary surface, for example, by adding the separating means is at least one polymer fiber components. If rassal the Ola cells), otherwise, the fiber having a cross-section view of a solid cell.

Linear density (titer) of the continuous filaments in the nonwoven material is to split materials, usually from 1.0 to 4.0 dtex, preferably from 1.6 to 3.3 dtex. Finally, at the first stage of processing continuous filament non-woven fabric obtained in the molding process of the fiber, twist by known methods using water jets under high pressure (see , for example, an application EP-A-0215684) and simultaneously decompose with the formation of cellular structures resembling part of the cake. In the case of a fiber having a cross-section view of a cell with a linear density of 1.6 dtex, containing 16 segments (elementary filaments of the fiber), which include the 8 segments of each of the polymer fibers, after splitting receive elementary fibers with a linear density of 0.10 dtex. After receiving extremely lightweight nonwoven material according to the invention suitable as a base, on which is placed the material to use completely non-perforated substrate, and not a sieve or a substrate with perforation. Because of this, due to the reflection on this substrate, water jets, you can use the reflective action of the base and SAMINA them put surfactant method wet with the goal of making the surface hydrophilic properties. This is done using known methods of soaking in the tub, unilateral management, combing up or packing. In a preferred embodiment, the surfactant (wetting agent) is applied by stamping on the template so that affected only the area of the skeleton of the fiber, the edge with the holes. In this case it is necessary to use special printing templates, which caused the pattern of perforation, and special measures to control the definition of the application of the wetting means in the manufacturing process.

Example 1

Non-woven material obtained in the process of molding the fiber mass per unit of surface 13 g/m2that contains up to 100% of the fibers of the honeycomb structure with a linear density of 1.6 dtex, placed on a sieve. Fiber cellular structure in its cross-section consist of alternating elementary segments (threads): 8 segments of polypropylene and 8 segments of polyethylene terephthalate. The size of the individual polypropylene segments is chosen so that the mass portion of the polypropylene was 30%, and the polyethylene terephthalate - 70%.

Unsplit non-woven fabric of continuous fibers are placed on a sieve for dehydration of 100 mesh and condense the water jetting Yes ovalocyte of filaments of polyethylene terephthalate.

After splitting is formed, respectively, the same number microfiber segments of polypropylene and polyethylene terephthalate. Separate linear density microfiber segments of polypropylene is 0.06 decitex, and segments of poly (ethylene terephthalate) to 0.14 decitex. The conversion value in measuring the diameter (in the ideal case of fibers with a round cross-section) showed that the diameter of the polypropylene elementary fibers (density of 0.91 g/cm3) is 2.36 μm, and polyethylene terephthalate elementary fibers (density of 1.37 g/cm3) was 4.42 μm.

After splitting fibers by water jets the surface of the fiber perforined using jets of water under high pressure (a pressure of 70 kg/cm2). For this purpose, as described in the application EP-A-0215684 drums for water drainage and holes having a protuberance on the outer surface, instead of the commonly used screens for dewatering.

After drying receive very soft surrounding material with a distinct perforation. In the ideal case, all the individual perforation holes have a circular shape and the same size. The location of the holes is an orthogonal lattice with step a, priceeven 6,0 mm Open surface (OP) is 34% of the total surface.

For perforated nonwoven material determine the maximum load in the longitudinal direction according to the instructions EDANA 20.289, the time of "passing" liquid according to the instructions EDANA 150.3-96 and the ability to reverse the wetting (also called re-wet) according to the instructions EDANA 151.1-96.

Timing the passage of fluid is performed with an interval of 1 min and repeat only twice without overlay filter paper if the problem persists. Presented values, respectively, are average values obtained from three measurements.

The results:

The breaking load in the longitudinal direction and 32.3 N/5 cm (see table.1).

Reverse wetting 0,09 g

Example 2

Perforated material obtained according to example 1 is impregnated with the aqueous emulsion nonionic wetting agent based on polysiloxane with the help of the so-called method of total immersion in the bath. The number of firmly applied material after drying is 0,042 wt.%. In this example, the following results are obtained:

The breaking load in the longitudinal direction 30,2 N is pavanna material, obtained in the process of forming fibers from polypropylene fibers of continuous polypropylene filaments with a linear density of 2.2 dtex and a weight per surface unit 10 g/m2form drag method from the melt layer of fibrous nonwoven material with a mass per surface unit 20 g/m2. The average diameter of the microfibers formed from a layer of fibrous nonwoven material (aerodynamic method from the melt) is 3,82 μm. The bonding surface extruded nonwoven material obtained in the molding process of the fiber, is 5.2%.

Such a two-layer laminate is treated as described in example 1, using water jets and perforined on tape 20 mesh. Calculated open surface is 18.4%. Such a two-layer non-woven material is also characterized by pronounced softness, but has insufficient value of the breaking load and the time of passage of liquid compared with values obtained in examples 1 and 2. Time the passage of fluid and the reverse wetting, respectively, determined from PP non-woven fabric obtained by the aerodynamic method from the melt.

The breaking load in prodcost through the upper surface is clearly too high values.

The example for comparison 2

The nonwoven material described in example comparison 1, put 0,40% nonionic wetting agent based on polysiloxane. The results obtained indicate that, despite the apparent reduction of the time of passage of fluid, while there is an incomparably high value back-wetting, which is unacceptable for the production of diapers.

The breaking load in the longitudinal direction of 24.6 N/5 cm (see table.4).

Reverse wetting 2,35,

The layer of nonwoven material formed aerodynamic method from the melt, gives upper surface softness. However, in the presence of the wetting agent layer acts like a sponge. Thus, this design proved to be unsuitable as cover for the suction of the material.

The example for comparison 3

Two-layer material described in the example for comparison 1, processed by water jets, as described in example 1. The radius of the holes r after perforation on the water jet apparatus is of 1.28 mm, step and does not change and is equal to 6,0 mm Open surface OP is 28.6%.

The results:

The breaking load in prohozhdenie fluid are also too high.

1. Perforated non-woven material with a specific gravity of from 8 to 17 g/m2containing intertwined continuous microfiber yarns with a linear density of from 0.05 to 0.40 dtex, consisting of at least two thermoplastic polymers with different hydrophobicity, having a cross-section in the form of cells or hollow cells from these microfiber strands are separated by splitting up the filament, and the perforation holes are made pure and free from split of filaments of fiber.

2. Perforated nonwoven material under item 1, characterized in that the perforation holes are arranged in an orderly fashion, the area of each hole is from 0.01 to 0.60 cm2.

3. Perforated nonwoven material under item 1 or 2, characterized in that the ratio of the maximum and minimum distances from points on the outer surface of the material to the nearest hole is from 1: 1 to 2: 1.

4. Perforated nonwoven material according to any one of paragraphs. 1-3, characterized in that the open area of the holes is from 8 to 40%.

5. Perforated nonwoven material according to any one of paragraphs. 1-4, characterized in that it is formed from a polyolefin and p is Arial according to any one of paragraphs. 1-5, characterized in that it contains the impregnation of at least one surfactant in an amount of from 0 to 0.60 wt. % relative to the weight of the nonwoven material.

7. Perforated nonwoven material according to any one of paragraphs. 1-6, characterized in that it has the following characteristics: time of passage of fluid through the minute, is less than 3, the reciprocal of wetting of less than 0.5 g and the maximum load in the longitudinal direction of at least 30 N/5 cm

8. Perforated nonwoven material according to any one of paragraphs. 1-7, characterized in that it is made in the form of a coating of hygiene products such as diapers and feminine pads.

9. A method of manufacturing a perforated nonwoven material according to any one of paragraphs. 1-8, namely, that split continuous fiber, which consist of at least two different thermoplastic polymers of different hydrophobicity, located in the cross section of the fibers in the form of alternating cells are placed in a non-woven material, split above of the fiber filament, and twist them with water jets under high pressure with the formation of twisted microfiber yarns and then perforined formed nonwoven hydrated non-woven material perforined drums for water drainage and holes, having a protuberance on the outer surface.

 

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