BG64934B1 - Perforated bonded fiber fabric and method for producing same - Google Patents

Abstract

Disclosed is a perforated bonded fiber fabric with a surface weight of 8-17 g/m2. The inventive fabric consists of continuous intertwined microfiber filaments with a titer that ranges from 0.05 0.40 dtex. Said filaments consist of at least two different types of filaments made from thermoplastic polymers with different hydrofobicities and a fiber cross section resembling the portions of a cake. The filaments are devoid of any conglutinations or fusions, especially in the region of the perforations.

Description

The invention relates to perforated non-woven fabric is a unit weight of 8 to 17 g / m ² of interconnected endless microfiber filaments with a tiger in the range of 0.05 to 0.40 dtex, which is made up of at least two different filaments of thermoplastic polymers with different hydrophobicity and fiber cross-section are made in the form of honeycomb cells, whereby the filaments, especially in the area of perforations, are free from adhesions and blunts.

BACKGROUND OF THE INVENTION

Hygienic absorbent products such as diapers for children and adults or bandages are generally made up of an absorbent core that seals the back of foil or non-woven / foil laminate and a side to the body that consists of a permeable flat tissue of rubbing a soft non-woven fabric or vacuum-perforated foil fitted with funnel-shaped, i.e. three-dimensional openings. The vacuum-perforated film encloses the absorbent core, with the largest perforated opening pointing outwards, i.e. toward the body. The foil material is composed of a hydrophobic thermoplastic polymer such as polyethylene, polypropylene or a copolymer of ethylene and polyvinyl acetate (EVA). This ensures that one side of the foil surface does not get wet from the body fluid, only moves the body fluid in the direction of the absorbent core and prevents the fluid from returning during loading, movement or pressure by reducing perforations. It is known that the absorbent core typically contains, together with the predominantly cellulosic material, also Superabsorbent Particles (SAP). The superabsorbent polymers are characterized by the fact that they can absorb aqueous liquids in large quantities, thus forming at a noticeable increase in volume a gel-like substance with a greater or less hardness of the gel. The presence of SAP has the advantage that it saves on weight and thus can reduce the thickness of the absorbent core and prevent the fluid from being re-deposited under pressure, which greatly impedes the flow of fluid. However, SAP has the disadvantage that it leads to some known blockchain, and is more pronounced than the number of them. Gelblocking refers to the effect that fluid is no longer transported or transported much slower. Appropriate constructions of absorbent hygiene products can solve this problem as well. In this case, bulk nonwovens or other non-blocking materials with many open structures are placed between the absorbent core and the covering layer. This intermediate layer immediately absorbs the fluid, i.e. immediately removes it from the surface of the diaper and distributes it evenly. Such measures improve fluid management. By fluid management, we mean here the general action of many or some of the already mentioned influencing factors in order to achieve the best possible comfortable sensation of the body when using hygienic products.

As a planar layer of the sheath to the body of the absorbent material, it is known that no perforated spinner nonwovens and polyolefin based staple nonwovens are used.

The fluid management for urine in diapers for children and adults and for menstrual fluids in women's hygiene is very advanced. The diapers of the future must not only be able to cope with urine in the best way, but also with rare bowel exudates. However, for this purpose, perforated non-woven fabric covers are not suitable. Corresponding body fluid is a multiphase solid particle system of different shape and consistency and with a tendency to phase separation, especially on active surfaces or surfaces with filtration and separation effects. For these fluids, the term bowel fluid is used below. It turns out that non-perforated non-woven fabrics are not suitable for the complete passage of fluid from the intestine and its transfer to the absorbent core. Moreover, there is a tendency for the solid and / or high-viscous portion of the bowel fluid to separate and accumulate on the surface of the diaper and possibly act as a restraining layer for the subsequent fluid of a less fluid consistency. Both the separation of the coarser ingredients into themselves and the associated blocking of the next fluid transport are significant disadvantages of conventional diapers. Therefore, numerous suggestions have been made to resolve the problem of fluid leakage from the intestine, all of which rest on the placement of layers of perforated layers (covering non-woven fabrics) on top. The perforation must be clearly shaped. The presence of transverse individual fibers or bundles of fibers, respectively, of any fibrous bridges are not appropriate. The perforated upper layers and structures of the diapers, as well as the composition of the non-woven fabric lying between the covering non-woven fabric and the open-structure fabric, must be adapted to the particular consistency and associated specific properties of the bowel fluid.

Numerous methods of punching are known as well as non-woven fabrics and compositions of non-woven fabrics. EP-A-0 215 684 describes the perforation of non-woven fabrics by means of a water-jet technique. Unfamiliar sieves are used as the medium for tissue deposition and treatment with water jets, and they are replaced by a dewatering cylinder with projections. They are responsible for accurate punching. U.S. Pat. No. 5,628,097 describes another method of perforation and other perforated products in which the nonwoven fabric is ultrasonically or thermally split lengthwise and by passing through a pair of rollers consisting of one or two bonded grooved joints (wavy). ) rollers are drawn transversely. The slits are separated at the melting points and opened for perforation. Non-woven fabrics of staple fibers and endless filaments, Melt-blown-non-woven fabrics and staple fabrics, and endless filaments of Melt-blown, which may be referred to as SM (Komposit Spunbond / Melt-blown) or SMS ( Spunbond / Meltblown / Spunbond composite).

Perforated non-woven fabric, applicable in the field of hygiene, requires not only a good distribution of fluid from the intestine, but also a high degree of whiteness, a correspondingly greater covering force and a very great softness, at least for the facing body side. Both properties are known to depend on the flexibility and softness of the fibers used. They are as good as the lower titre of the fibers, so the use of fine, finest or even ultra-fine fibers is suggested. Ultrafine fibers are also referred to as microfibers. They may be based on woven or non-woven fabrics. Also, Melt-blown non-woven fabrics consist of microfibers measuring about 1-10 μm in size.

Known diapers for children from the manufacturer Unicharm, which are coated with a perforated non-woven fabric, which is obtained according to the special water punching method described above, and which consists of a combination of PP / PE-Spunbond and a layer of PPMelt- blown. This combination of fabrics enhances intestinal fluid uptake, good Melt-blown side softness (= body side side) and a high degree of coverage. However, this construction of the material and the method of its production show significant disadvantages. The Melt-blown layer does not make a significant contribution to the overall strength, respectively, to the overall integration of the material. Weights far outweigh the usual current weights. It is not possible to reduce the weight to below 30 g / m ² due to the rigidity requirements for machine arrangement of the diapers. Applying many materials is expensive. The Melt-blown layer itself is not abrasion resistant and needs to be further heat treated in addition to water jet to attach to the Spunbond nonwoven fabric and to avoid delimiting trends. This in turn requires conjugated fibers with a centric or eccentric envelope of a lower-melting polymer than that of the Meltblown layer. However, this perforated SM bandage to the M-side is far from achieving the abrasion resistance of PP-Spunbonds or PP-by compressing the bonded staple nonwoven fabric used today for diapers and bandages. For other applications, such as diaphragm sealing sleeves or OP non-woven fabrics, which require erasure resistance or Lint-freedom respectively, only SMS can be used. Such coverage of the Melt-blown layer towards the body side would lose the benefits of the Melt-blown layer.

OtUS 4 840 829 are known nonwovens with a surface weight of 10 to 150 g / m ² , which are obtained from staple fibers of length 20 to 100 mm and a titre of 0.555 to 16.65 dtex. These non-woven fabrics have circular or elliptical openings which are obtained by treatment with water jets on a support provided with projections.

In addition, document WO 1998/023804 discloses hardened non-woven fabrics and a method for producing them consisting of multicomponent fibers and which, upon hardening to non-woven fabric, are separated into their individual constituent fibers and entangled.

It is an object of the invention to create a perforated non-woven fabric which has better properties in absorbing the fluid from the intestine with respect to the present non-woven fabrics, which is not inferior to the requirements for surface coverage, softness and delicacy of the body, which makes unnecessarily the construction of two or more layers and has significantly less weight of the fibrous material than the previously used perforated non-woven fabrics. It is further an object of the invention to improve the uptake of fluid from the intestine without affecting the uptake of urine. It is also an object of the invention to achieve the passage of liquids through the perforated non-woven fabric without the use of detergents, respectively, to reduce their application to a fraction of the amount commonly used in non-perforated nonwoven fabric.

SUMMARY OF THE INVENTION

The invention relates to a perforated non-woven fabric with a surface weight of 7 to 25 g / m ² of co-interlaced endless microfiber filaments with a titer of the order of 0.05 to 0.40 dtex, which are made up of at least two thermoplastic polymers with different hydrophobicity and filamentous cross-section of Pie or Hollow-Pie shape, from which the cut filaments are removed, whereby the perforations are clearly expressed and are free of cut filamentous filaments.

The non-woven fabrics of the invention, despite their extremely light weight, show great strength and have a clear hole structure based on this small fibrous mass. It is therefore possible to rapidly pass the body fluids, in particular those of the intestine, without or with the minimum use of low surfactant (wetting) surfactants and to provide a dry surface of the upper layer for diapers and bandages.

The various filaments show a caption in the range given below. The perforations are mostly evenly arranged and have a single hole surface of 0.01 to 0.60 cm ² .

The nonwoven fabric according to the invention preferably has a Stricke Through value after 1 min less than 3 s. The highest tensile strength is preferably at least 30 N / 5 cm. The rewet value is preferably less than 0.5 g.

For example, two different filaments of thermoplastic polymers in a weight ratio in the range of 20: 80 to 80: 20 may be used for the construction of the non-woven fabric. The construction of the non-woven non-woven fabric based on two F1 and F2 filaments is explained below.

The invention also relates to a method for producing such perforated non-woven fabrics by depositing cut pie or hollow pie endless fibers, whose cross-section shows at least two different thermoplastic polymers with different hydrophobicity in changing arrangement like bee cells , the subsequent cutting and interlacing of the fibers in interwoven endless filaments by means of high-pressure water jets and the subsequent perforation of the formed non-woven fabric with high-pressure water jets.

This results in perforation mainly on dewatering and hole-forming drums that have projections on the surface.

The following is a description of the polymers used for the preparation of the nonwoven fabric of the invention and then the method of preparation.

Of the two fibrous polymers F1 and F2, at least one of the two is hydrophobic and is derived primarily from a number of polyolefins such as polyethylene, polypropylene or copolymers thereof, in which one of the two is in excess. The other may be either hydrophobic or hydrophilic, but preferably it is not hydrophilic but less hydrophobic than polypropylene. Here, the more hydrophobic fibrous polymer is designated F1 and the less hydrophobic fibrous polymer is F2. F1 consists predominantly of polypropylene (PP) or polyethylene (PE) or a mixture of both. F2 may for example be a fiber of the type of polyesters such as polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate or their copolyester and PE. Both F1 and F2 are not subject to restrictions on polymer selection, and furthermore, through known methods of spinning fibrous materials, can be transferred to conjugated fibers.

F1 and F2 may either or both consist of a thermoplastic elastomer. Examples of elastic polyolefins for spinning non-woven fabric are found in EP-A-0 625 221 and for metallocene-catalyzed LLDPE in EP-A-0 713 546, which also describes representatives of less hydrophobic elastomers such as polyurethanes, ethylene-butylene- copolymers, poly (ethylene-ethylene) styrene copolymers (Kraton), poly-adipate-ester and polyester ester-elastomer (Hytrel). These elastomers are known to be extruded into spinning non-woven fabrics with Meltblown or SMS combinations. The incorporation of such elastomers into F1 and / or F2 increases the softness and elasticity of the perforated microfiber nonwoven fabric. In addition, it has been shown that only perforated non-woven fabrics consisting of interconnected microfiber endless filaments have excellent fluid absorption properties. Perforated non-woven fabrics of similarly interwoven microfiber staple fibers do not achieve these improved properties. Only for processing on diaper machines (high pulling force required in the direction of the machine), should the weight of the diaper be increased an average of three times, with a significant reduction in perforation, flexibility, softness, abrasion resistance and fluid intake.

Additions of Masterbatches polymeric melt-enhancing agents are also possible for the purpose of antistatic equipment, spinning dyeing, matting, softening, bonding and elasticity of fibers, enhancing or reducing the repulsive properties of liquids (such as water, alcohols, hydrocarbons, oils), fats and multidispersed systems, such as bowel fluids and other body fluid exudates such as urine and menstrual fluid.

Ingredients may also be applied which alter the surface tension of the microfacer surface by subsequent application after generation, respectively, of the release of the microfiber filaments into the already perforated fibrous material. Such substances are, for example, dissolved in water or in dispersed form of wetting agents, which today are provided with many diaper roofing nonwoven fabrics for better absorption of urine.

Non-woven fabrics of the present invention can be used predominantly without such wetting agents, respectively, with only minimal amounts relative to the amounts used so far. The construction of perforations, ie their size of holes, their shape, the arrangement of the individual perforations with one another (for example, through holes or in a row) and on the open surface on one side, as well as the extremely softness of the barrier consisting of interwoven endless microfiber filaments (the area between the perforations) and their very low weight make it possible to reduce these wetting agents to their complete elimination.

The drawings indicated in Figures 1 to 6 further illustrate the invention.

Figures 1 to 6 show the shape of the individual openings K and their arrangement in the planar structure. In Fig. 1K, an opening is presented in the form of an equilateral hexagon, with the lengths of sides a and b being the same. The distance o is the shortest distance from the center with the aperture K and the edge a. The edges a and b are always at the same distance g to each adjacent K. About each individual aperture K may, in parallel with a and b, follow a larger equilateral hexagon with edges e and f. In figure 1, f = f. This results in a beekeeping arrangement of the openings K. The edges a and b of one hole K are always parallel to the adjacent edges a and b of the adjacent hole K. The distance h = 5.9. The tips of the tangles of the aces, respectively a with b, are in the non-woven fabric in rounded shape. These rounds i and j at the vertices are given in figure 1 for i = j. These rounds reduce the initial distances d to e of the hexagon to q and y. In the case of Figure 1, again q = g.

The rounds i and j may in the extreme be so extended that K becomes circular, as shown in Figure 2.

The openings K in Figure 3 are different from those in Figure 1 in that b is significantly longer than a and rounding i is more pronounced OTj.

The rounding i and j may, in the extreme, be so extended that a hexagonal K is elliptical in shape as given in Figure 4.

The hexagonal shapes of the openings K or those obtained by the rounding and arrangement thereof, as given in Figures 1 to 4, are particularly suitable for absorbing the liquid. Particularly at simultaneous hexagonal openings K with their rounded deviations, body fluid has the shortest path from the surface of the diaper to its interior.

However, the invention is not limited to such uniform shapes and arrangements. Other polygons for K and their rounded derivatives are also considered, as well as uneven distributions of such and other openings. However, such openings are less suitable and the arrangement thereof, which constitutes an obstruction to the emitted body fluid furthest from the end of the opening, can quickly flow through the opening K. Such arrangements are given, for example, in Figures 5 and 6. .

The distance of the farthest point w to the (rounded) corner of the quadrilateral is significantly greater than the distance h. The ratio of u / h at the maximum distance not from the hole K to the minimum distance should ideally be 1/1 and at worst it should not exceed 2/1.

The area of the individual hole is in the order of 0.01 to 0.60 cm ² , in particular between 0.04 and 0.40 cm ² . The individual holes of the holes can have the same shape and the same surface of the holes. However, they may have both, or only one of the two forms, as described above for u / h, being less than or equal to 2/1.

The open surface of the holes is in the range of 8 to 40%, preferably between 12 and 35%.

Microfine, interwoven endless filaments S form the frame L of the openings. Perforated non-woven fabric, as previously stated, may contain surfactants that give it a washable, delayed wash, or residual hydrophilicity. It is advisable to apply them after wet-to-wet perforation. The amount to be applied is between 0 and 0.60 theta. % by weight of the fibrous material, preferably between 0 and 0.20%. The dosage is determined according to the area of the individual holes and the open common surface. The larger they are, the more the content of these surfactants can be reduced. For reasons of optimum bioavailability, the aim is to reduce to 0% the content of surfactants.

It is particularly advantageous not to apply the surfactant over the entire frame, but to confine it directly to the periphery of the hole. From this point, the suction action of the liquid towards the perforation is manifested. The multidisperse fluid system is thus not subjected to dewatering or phase separation, respectively. This prevents the perforations from being blocked and deposited on the frame. The layer between the absorbent core and the surface layer which absorbs and distributes the fluid, which also has wetting properties, provides additional immediate removal of body fluid from the surface of the diaper.

Get the perforated non-woven fabric (top layer)

The method is to cut non-woven fabrics of endless filaments from sliced pie or hollow pie endless fibers using spinning non-weaving technology. The cross sections of the uncut nozzles emerging from the nozzle consist of two different polymeric constituents, Ni F2, which are arranged in varying sequence as bee cells next to each other (typically 4 to 16 such bee cells). As a prerequisite for subsequent cutting, the use of such 2 polymer-chemically highly different constituents which exhibit as little adhesion as possible on their common boundary planes. However, chemically similar polymer constituents, such as polyethylene terephthalate and one copolymer or polypropylene and polyethylene, may be used if measures are taken to reduce the adhesion of the boundary surfaces of the two constituents, such as by adding separating agents in at least one fibrous polymer component. If the cut fiber has inside (circular) hollow space, then it is called the so-called Hollow-Pie fiber, otherwise it is Pie-fiber.

The endless filament tiger is pre-cut as a rule of 1.0 to 4.0 dtex, preferably 1.6 to 3.3 dtex. Then, the endless filaments of the spinning nonwoven fabric, by known methods of high pressure jetting technology, are intertwined in one first successive step and at the same time cut into their beehive ingredients. For Pie fibers with a tiger of 1.6 dtex and a total of 16 segments consisting of 8 segments of the two fiber polymers, after cutting, the microfibers have a tiger of 1.0 dtex. Since the invention relates to a non-woven fabric of very low weight, it is advantageous not to use a mesh or a perforated mat, but to be completely imperforated, as a support on which the non-woven fabric is placed. In this case, the energy of the collision can be utilized by reflecting the water jets on the substrate and thus minimizing the energy loss.

After perforation, the material may be dried, or before that, it is expedient to apply the wet-to-wet application method before the surface-active substance to be dried for surface hydrophilisation. This can be done by known methods such as total bath impregnation, unilateral fullation, by smearing or under pressure. According to a more particular embodiment, the surfactant is applied in a pattern in such a way that only the boundary locations of the fiber perforation frame are affected. This requires the placement of special compression molds, which must be consistent with the perforation pattern, as well as measures to control the sharpness of the surfactant pressure circuits during operation.

Examples of carrying out the invention

Example 1.

A non-woven fabric with a surface weight of 13 g / m ² consisting of 100% Pie-fiber with a titer of 1.6 dtex is placed on the sieve. The pie fiber consists in its cross section of alternating 8 polypropylene segments with 8 polyethylene terephthalate segments. The size of the individual polypropylene segments is so selected that the weight of the polypropylene is 30% and that of the polyethylene terephthalate is 70%.

The uncut filamentous nonwoven nonwoven fabric is placed on a 100 mesh dewatering sieve and fixed with a 180 mbar water jet, whereby the endless filaments are cut into their 8 microfiber segments of 8 propylene and 8 microfiber segments of polyethylene terephthalate.

After cutting, the same number of microfibrous segments of polypropylene and polyethylene terephthalate are obtained each time. The microfiber segments of polypropylene have a single tiger of 0.06 dtex, and the segments of polyethylene terephthalate have a single tiger of 0.14 dtex. Calculating dtex in fiber diameter (idealized on a circular cross-section) gives a value of 2.36 μ for polypropylene (density 0.91 g / cm ³ ) and a value of 4.42 μ for polyethylene terephthalate (density 1.37 g / cm ³ ).

After cutting the fibers through water jets, the planetary formation is also subjected to perforation by means of high pressure water jets of 70 kg / cm ² . For this purpose, the drums with holes projecting on the surface of the drum described in EP-A-0 215 684 are used instead of the usual dewatering sieves. 5

Drying produces a very soft, flexible non-woven fabric with clearly formed perforations. The individual holes of the perforation are all (ideally) circular and the same size. The arrangement of the holes takes place in an orthogonal grid with the distance of the grids a, whereby a planar centered top arranges a new mesh with holes.

The radius r averages 1.4 mm and the distance a = 6.0 mm. The open area of OF is 34% of the total area.

The perforated non-woven fabric measures the maximum tensile strength (re-wetting) according to EDANA 20.289, the Liquid Strike Through Time according to EDANA 150.3-96 and the Coverstock Wet Back (also called Rewet) according to EDANA 151, 1-96.

Strike Through is measured after a waiting time of 1 minute each with a total of 2 repetitions without changing the filter paper pads. The aforementioned data are averaged values from a total of 3 unit measurements.

Results:

Maximum tensile strength in length: 32.3 N / 5 cm

1. Strike Through (sec) 2. Strike Through (sec) 3. Strike Through (sec) directly in 1 minute after another 1 minute 1.82 2.42 2.44

Rewet: 0.09 g

Example 2.

The perforated non-woven fabric of Example 1 is soaked in Foulard by the so-called whole-bath method with a water emulsion of a non-ionic wetting agent based on polysiloxane. The amount of substance applied after drying is 0.042 wt. %. The following test results are obtained with this sample:

Maximum tensile strength in length: 30.2 N / 5 cm

1. Strike Through (sec) 2. Strike Through (sec) 3. Strike Through (sec) directly in 1 minute after another 1 minute 1.58 2.10 2.11

Rewet: 0.31 g

Comparative Example 1.

By compression bonded spun non-woven of polypropylene with endless filaments with a titre of 2.2 dtex and a basis weight 10 g / m ² is nadprida Meltblown-layer ot20 g / m ^2. The average 45 diameter of the Meltblown-forming microfibers was 3.82 μ. The welded surface of the pressed nonwoven fabric is 5.2%.

This two-layer laminate was sewn according to the method described in Example 1 with water jets and then perforated on a conventional 20 mesh sieve. The open plane is calculated at 18.4%. This two-layer non-woven fabric is also very soft, but shows significant drawbacks in terms of maximum tensile strength and Strike Through tests compared to the values measured in Examples 1 and 2. Strike Through and Rewet are always tested on PPMeltblown country.

Maximum tensile strength in length:

25.4 N / 5 cm

1. Strike Through (sec) 2. Strike Through (sec) 3. Strike Through (sec) directly in 1 minute after another 1 minute 3.81 4.92 4.96

Rewet: 0.10 g

Strike Through values are too high for top layer.

Comparative Example 2.

0.40% polysiloxane-based non-ionic wetting agent was applied to the sample of comparative test 1. As the results of the measurements show, Strike Through values can be significantly reduced, but Rewet increases incomparably. Such a high wetting cannot be accepted in diapers.

Results:

Maximum tensile strength in length: 24.6 N / 5 cm

1. Strike Through (sec) 2. Strike Through (sec) 3. Strike Through (sec) directly in 1 minute after another 1 minute 1.23 2.35 2.40

Rewet: 2.35 g

The Meltblown-Plate imparts a great softness to the top layer. In the presence of wetting agents, this Meltblown layer acts as a sponge. Such a construction proves unsuitable as a coating of the fluid-absorbing layer.

Comparative Example 3.

The double-double fin structure described in Comparative Example 1 is treated with water jets according to Example 1.

The average radius of the holes after perforation with water jets is g = 1.28 mm. The distance a remains unchanged a = 6.0 mm. Open plane OF = 28.6% was obtained.

Maximum tensile strength in length: 24.2 N / 5 cm

1. Strike Through (sec) 2. Strike Through (sec) 3. Strike Through (sec) directly in 1 minute after another 1 minute 2.93 3.78 3.84

Rewet: 0.10 g

Strike Through values are again too high.

Claims (9)

1. Perforated non-woven fabric of unit weight 8 to 17 g / m ² of interconnected continuous microfiber filaments with a tiger in the range 0.05-0.40 dtex, which is composed of at least two thermoplastic polymers with different hydrophobicity and filament cross section with pie- or hollow-pie-shape from which the filaments are removed, whereby the perforations are clearly expressed and are free of the filamentous filaments. 2. Perforated non-woven fabric according to claim 1, characterized in that the perforations are evenly spaced and the area of the single hole ranges from 0.01 to 0.60 cm ² . 3. Perforated non-woven fabric according to claim 1 or 2, characterized in that in the non-woven fabric the ratio of the maximum distance from the points of the surface of the non-woven fabric to the next perforation to the minimum such distance is from 1: 1 to 2: 1. 4. Perforated non-woven fabric according to claims 1 to 3, characterized in that the open surface of the hole is from 8 to 40%. 5. Perforated non-woven fabric according to claims 1 to 4, characterized in that the perforated non-woven fabric is made of polyolefin and polyester filaments in a weight ratio ranging from 20: 80 to 80: 20. 6. Perforated non-woven fabric according to claims 1 to 5, characterized in that the non-woven fabric is impregnated with 0 to 0.60 wt. % by weight of the nonwoven fabric with at least one surfactant. Ί. Perforated non-woven fabric according to claims 1 to 6, characterized in that the value at the Strike Through breakthrough test after 1 min is less than 3 s, the rewet re-wetting value is less than 0.5 g and the maximum the tensile strength is at least 30 N / 5 cm. Method for producing perforated non-woven fabrics according to claims 1 to 7, characterized in that it consists of depositing pie- or hollow-pie continuous fibers whose cross-section shows at least two different thermoplastic polymers with varying hydrophobicity in beekeeping cells, in non-woven fabric, then slicing and weaving the cut filaments into interlaced microfiber filaments using water jets under pressure and then perforating the formed non-woven fabric with high pressure water jets. Method according to claim 8, characterized in that the perforation is performed on dewatering and hole-forming drums having projections on the surface. Use of perforated non-woven fabric according to claims 1 to 7 as a top coat in hygienic products such as diapers and bandages.