DE10361339A1 - Cotton wool pad for cosmetic applications has specified strength and a surface pattern produced by water jetting with high proportion of recesses - Google Patents

Abstract

A cotton wool pad produced by water jet needling has a surface pattern on one side with recesses comprising at least 55 %, preferably 85 to 95 %, of the area, separated by narrow, e.g. less than 95 mm wide, ridges. The internal strength is at least 0.55 N, preferably 0.75 N per 25.5 cm2>. Preferably the area of a recess is 20 to 40 mm2>, the ridge spacing 0.5 to 1.5 mm, the ridge depth 0.1 to 0.2 mm, the pad 3 mm thick with a weight of 220 to 260 g/m2>. An independent claim is also included for the manufacturing process consisting of wetting a fiber layer with a pressure of 3 to 7 bar and then water-jet punching on both sides at 8 to 12 bar. This is followed by further water-jet punching on one side at 22 to 30 bar through a steel stencil or mask with the required pattern etched or laser cut in it, and which is mounted on a rotating drum.

Description

The The invention relates to a cosmetic cotton pad with elevations and formed by water jet needling, in the plane direction on all sides limited by elevations arealwide extended depressions. Furthermore, the invention relates to a Process for producing such a cosmetic cotton pad.

cosmetic Cotton pads have a diverse Application. So cotton pads are used to cleanse the skin, The skin is also freed from the skin's secretions, such as fat or previously applied layers, such as make-up or masks, wiped off. For For cleaning purposes, cotton pads are often used for cleaning supportive Liquid, such as As water, solvent-containing lotions or the like, wetted or soaked. Cotton pads are often used also as an aid for the application of cosmetic products, such as z. Creams, on the skin. It is also conceivable that cotton pads on the skin surface be applied and then as a means of distribution for cosmetic Extracts that are applied to the cotton pad serve.

Out The uses described above are specific Requirements for a cotton pad. It should give the user a soft feel benefits convey, but still connected a good cleaning effect with a high stability and strength. About that In addition, a sufficient absorbency and fluid retention capacity be given.

If above of cotton pads is the talk, so be sure In general, absorbent pad-shaped nonwoven articles understood, whose fiber content is formed from cotton fibers. It is expressly on it noted that also a pad-shaped Nonwoven articles whose fiber content is derived from other cellulosic Fibers or other than cellulosic fibers are still formed additions synthetic fibers such as e.g. thermoplastic fibers, for example made of polyester, polyamide, polyacrylic, polyolefins, polyurethane, too as multicomponent fibers, in particular as bicomponent fiber, and preferably as microfibers having a fiber thickness of ≦ 1 dtex, in particular Micro staple fibers of a length of at least 7mm, as a cotton pad in the sense of the preceding Invention and also referred to in the sense of traffic habits becomes. At least in principle would be too the production of a pad-shaped Nonwoven article imaginable, made for the most part of synthetic Fibers is formed. But in such a case would have to be quite significant Dimensions of hydrophilizing agent used to become an absorbent absorbent article why usually in the manufacture of cotton pads, cellulosic fibers, and preferably Cotton fibers as natural hydrophilic fibers are used. Cotton pads with a high, preferably 100% amount of cotton fiber content in terms of on a soft feeling and a good fluid intake behavior prefers.

In order to achieve a good cleaning effect in terms of both a good stripping effect and a good retention effect for detached contaminants, it has already been proposed to provide one or both sides of such a cosmetic cotton pad with a surface structuring. In particular, was with EP 1 106 723 A1 proposed to provide grooves on one or both sides, which are manufactured by water jet needling and have a distance between 1 and 8 mm. In particular, grooves could be provided on the one side grooves with a distance between 1 and 8 mm and on the other side grooves with a distance of only 0.4 to 1.2 mm. Such a cotton pad is known under the trademark "Demak'up Duo Pad" in the trade.

Besides are cotton pads with embossed surfaces known. This is an already pre-consolidated nonwoven material with Help of a stamping calender under the influence of heat provided with a surface structuring. By embossing can be arbitrary and complex surface structures generate, which also has a good cleaning effect, especially wiping action and retention effect exhibit the surface But the cotton pad is hardened by the embossing process, so that they are less suitable to give a soft feeling. cotton pads with one-sided and by embossing in the form of a check pattern or in the form of a dot pattern Structuring has become known under the names "Luxana" and "Tesco" in the trade.

EP 1 310 226 A2 discloses a cosmetic cotton pad, both sides of which are provided with a fine groove structure produced by water jet needling, wherein on at least one side of a structure of webs and recesses superimposed on the fine groove structure is additionally formed, wherein the recesses formed in a longitudinal direction either continuously or in the plane direction of the remaining Elevations are limited on all sides. With EP 1 310 226 A2 is aimed at achieving a strengthening effect by water jet needling only in surface areas of a relatively small thickness in order to achieve a firmer integration of individual fibers on the surface and thus a reduced lint effect. In a central core area of the cotton pad, the fibers remain in loose composite. The continuous surface structure by fine grooves also increase the tensile strength of the cotton pad, which is meant in the absence of further information probably in the plane direction.

The commercially available cosmetic cotton pads of the brand "Siempre" (Lidl) and "Duo-face" (Carrefour) point in the plane direction On all sides by elevations limited areally extended depressions on and are therefore generic. The area fraction the wells is about 40% and less. Both cotton pads are very prone to linting. Furthermore exists during the application and in particular by the action of shear forces strong tendency to delaminate. Also when removing the pads from an outer packaging, so if tensile forces perpendicular to the plane direction As the pad is initiated, the pads tend to be between the top and delaminate base.

Of these, The present invention is based on the object, to create a cotton pad, in addition to a very good soft feel, a good cleaning effect and a high liquid absorption capacity also one good fiber cohesion, so little tends to delaminate what in known cotton pads often already happened when removing from an outer packaging.

This object is achieved according to the invention in a cosmetic cotton pad of the type mentioned in that the areally extending depressions have an area fraction of at least 55% of the total area of the considered flat side in plan view and the cotton pad has an internal strength of at least 0.55 N / 25, 5 cm ² has.

With In the present invention, it has been found that the fiber cohesion can be improved if the area ratio of the plane direction On all sides by elevations limited areally extended depressions is enlarged, in particular to at least 65%, preferably to at least 75 to 85%, and more preferably up to 95%. Because the areal extended depressions formed by water jet needling As a result, a soft feel of the cotton pad is not in adversely affected. Moreover, can be needled by water jet also an entanglement of fibers in inner core areas of the Cotton pads and thus an increase the internal strength of the fiber composite can be achieved, the like is defined as follows: If of internal strength of a nonwoven article or Faserverbunds, so this is not the resistance with tensile stress of the article in the plane direction, ie in direction its areal Extension, understood as usually determined in a tensile tester can be. With inner strength, rather, by the three-dimensional Entanglement of fibers or otherwise achieved resistance against delamination of the nonwoven article. This Resistance is determined by the considered nonwoven article pulled apart substantially perpendicular to its planar extent becomes. However, when in use with a shearing stress, in the plane direction in opposite directions acting personnel attack on one top and one bottom of the pad, to one Delaminate the nonwoven article lead, so this too an insufficient one internal strength, so a lack of entanglement or other Attributed compound of the fibers inside the article. Quantitatively The internal strength is determined by the following Internal strength test.

Internal strength test areal Non-woven products:

For this purpose, a tensile testing machine to DIN 51221, class 1 and two auxiliary sheets and double-sided adhesive tape can be used. A planar circular disk-shaped sample of 57 mm diameter is glued by means of the double-sided adhesive tape between an upper and a lower auxiliary sheet, protrudes perpendicularly a clampable holding web (T-shape). If only smaller pads are available or can be tested, it is also possible to work with a circular disk-shaped sample of 28.5 mm diameter, which should then be indicated in the results. In this case, the result is to be normalized to a test area of 25.5 cm ² . The two auxiliary sheets are clamped in the tensile testing machine and then moved apart at a speed of 100 mm / min; meanwhile the tensile force is measured. It is then determined the maximum traction. By the maximum tensile force is meant the maximum force at which the cohesion of the cotton pad is destroyed. If previously measured higher force peaks in the course of stretching, so this is the highest traction in the sense of this test.

21a) and b) show schematically the experimental setup. One recognizes the disk-shaped test specimen in the form of a cotton pad 40 , as well as each adjacent the double-sided tape 42 and the auxiliary sheets 44 that with her protruding jetty 46 in clamp receptacles 48 the tensile tester are clamped.

at The double-sided adhesive tape is an adhesive tape of Company 3M (Tape 410) with natural rubber as adhesive coating and a defined adhesive force of 19.3 +/- 2.2 N / 25 mm after the German Pharmacopoeia of 1996 (removal method described there).

to sample preparation becomes one of the size of the cotton pad corresponding portion of the above-mentioned double-adhesive tape, respectively glued on top and bottom of the cotton fleece layer of the cotton pads to be tested. The composite obtained in this way becomes (after removal of the outer cover layers of the adhesive tape) between the two auxiliary sheets and centric positioned. Then the auxiliary sheets by means of a weight weighted down a mass of 1 kg for 1 min, making the composite off Cotton pad and double adhesive tape and auxiliary sheets intimately with each other is connected. This composite is then placed in the tensile testing machine clamped according to DIN 51221, and with the mentioned speed of 100 mm / min, the terminals are pulled apart and thereby the tensile force determined. From at least five Single measurements are averaged and given in N.

For the reproducible execution Measurements will increase the adhesive power of the double sided adhesive tape after the mentioned Abziehmethode of the German Pharmacopoeia in 1996 specified or standardized. For this is the one Force required to make tapes (e.g., plasters) of one level ground at an angle of 180 ° at a constant speed deducted. Again, a tensile tester according to DIN 51221 class 1 for this related. There are stainless steel plates, 150 × 50 × 2 mm mechanically polished and longitudinal roughened for use.

The exam becomes at 23 ° C and 50% relative humidity. Before that are the samples Store for 24 hours under these standard conditions. The Steel plates are mixed with a cotton wool soaked in toluene before starting cleaned, then they are in a suitable container with the vapors brought in contact with boiling toluene without the liquid however, touch directly. The resulting vapors sweep along the plate surfaces for 5 minutes. After that, the plates are Allow to cool for 30 minutes in standard atmosphere.

It then strips of 400 mm in length and given width cut from the roll of 12.5 or 25 mm, and cut to the cleaned Metal plates applied so that air pockets are avoided. By means of a "Tape Applicator" is under a Pressure of 20 N / cm sample width of the adhesive tape strips rolled (where the back Cover paper of the adhesive tape has not yet been removed). After 10 minutes waiting time then the measurement takes place.

to Measurement is beaten back the upper free end of the sample strip and subtracted about 25 mm from the top of the steel plate. This The end of the steel plate is placed in the upper clamp of the tensile testing machine clamped in and the struck back End of the sample strip is placed in the bottom clamp of the tensile testing machine clamped. The deduction angle is thus 180 °, with it on to pay attention that the sample backs parallel to each other, but not rub against each other. The tensile testing machine is set to a take-off speed of 300 +/- 30 mm / min.

to Determining the adhesive force is to determine the force curve and record. From the resulting force peaks is then the middle Adhesive strength according to one of the methods described below A) to C).

at deviant curves is optionally according to the methods described below To evaluate A or B In these cases, the evaluation procedure to be indicated in the result information.

Evaluation method C:

This Procedure is to be applied if the chart is more than 20 clearly having noticeable force peaks.

requirement is that the variations occurring within the chart do not occur periodically. If that is the case, the evaluation procedure is B apply.

outgoing from the middle of that chart length 1, which ranges from the first power point to the demolition, are four vertical lines at equal intervals of 1/10 of this diagram length submit to both sides.

These distances are rounded up to whole millimeters. The nine peaks that closest to these lines are to be used to determine the bond strength.

Separate extremely high peaks from the curve are added not included in the evaluation.

The Result is the mean of at least five exams in N / 25 mm to one After decimal place to be rounded. Further information is permitted.

F_i = Kraftspitzen F₁, F₂ ..... F_n
n = Anzahl der ausgewerteten Kraftspitzen The bond strength is calculated as follows:

F _i = force peaks F ₁ , F ₂ ..... F _n
n = number of evaluated force peaks

The Evaluation can also be done with a suitable PC program.

Evaluation method A:

This Procedure should be applied if the chart is clear by five having distinguishable force peaks. The mean of the values This force peaks must be determined.

in the If only one force peak occurs in the diagram, the corresponding one is Value as "mean".

Evaluation method B:

This Procedure is applicable if six to ten clearly distinguishable Force peaks appear in the diagram.

The Peak values of the middle 80% of those chart area that with the first power point begins and ends with the demolition used to determine the bond strength.

The The above description of the adhesive strength serves, as already mentioned, standardized reproducible conditions for the one described above To create test of internal strength to be used adhesive tape.

It It has been found that cotton pads according to the invention have a lower Have a tendency to delaminate as known products.

According to preferred embodiments of the present invention, the areally extending recesses in the plane direction are limited by elevations whose width is less than 2 mm, in particular less than 1.5 mm, in particular less than 1.2 mm, in particular less than 1 mm and further in particular which is less than 0.95 mm.

Furthermore, it proves to be advantageous if the areal direction in the plane direction by elevations limited areally extending depressions an area of 5 to 85 mm ² , in particular from 10 to 70 mm ² , in particular from 15 to 55 mm ² and more particularly from 20 to 40 mm ² .

To a further embodiment The present invention encompasses the two-dimensionally extended depressions a groove structure formed by water jet needling with a groove spacing of 0.5 to 1.5 mm, that is compared to the areal Extension of the depression is preferably much smaller, so that at the bottom or bottom of the recess a fine groove structure looming. This fine groove structure advantageously has a depth of only 0.1 to 0, 2 mm.

It is further proposed that the cotton pad according to the invention with a weight per unit area of 150 to 350 g / m ² , in particular from 200 to 280 g / m ² and more particularly from 220 to 260 g / m ^{2 is} formed. The thickness of the cotton pad is expediently at least 2.6 mm, in particular at least 2.8 mm and more particularly at least 3.0 mm, measured at a test pressure of 0.5 kPa.

In a further embodiment of the invention of particular importance, the cotton pad according to the invention has an internal strength of at least 0.60 N / 25.5 cm ² , preferably of at least 0.65 N / 25.5 cm ² , more preferably of at least 0.70 N. / 25.5 cm ² , and more preferably at least 0.75 N / 25.5 cm ² .

It understands that for the cotton pad according to the invention also the tear strength in a longitudinal direction and a transverse direction by introduction of opposite tensile forces Clamping of the cotton pad can be determined in a tensile tester can. The cotton pad according to the invention advantageously has a tear strength of more than 7 N / 25 mm, in particular more than 9 N / 25 mm and preferably from more than 10 N / 25 mm.

Tear strength in longitudinal and Transverse direction:

The aforementioned tear strength can by using a standard tensile testing machine according to DIN 51221 the following test method It will be determined from cotton pads to be tested, and preferably from a middle area of the cotton pad samples of a clamping width of 25 mm and a clamping length cut out of 30 mm, preferably punched out. These Samples are clamped vertically in clamping receptacles of the mentioned tensile testing machine. To carry out The clamping recordings are then measured at a test speed of 100 mm / min in opposite directions, but in the plane direction the clamped sample moved apart, and thereby the by the clamps were applied to the sample and plane tension is constantly measured. Under the maximum traction is understood as the maximum force at which the cotton pad tears. If previously higher Force peaks are measured in the course of stretching, so put these the maximum traction in the sense of this test It can be advantageously used in measurements of longitudinal and the transverse direction, which is usually the machine direction or the direction transverse thereto, several, especially five, Carry out individual measurements and calculate their mean value. It shows itself, that the cotton pad according to the invention also in this one Superior number of previously known cotton pads is what is discussed below will be. According to a further advantageous Auführungsform the cotton pad according to the invention Can at least one of the tops of the cotton pad with an abrasive be provided effective coating. In this context will to the entire contents of PCT / EP 03-07628, which hereby is made the subject of the present application.

• a) Zuführen eines Fasergeleges
• b) Befeuchten des Fasergeleges
• c) Wasserstrahlvernadeln einer ersten Oberseite des Fasergeleges
• d) Wasserstrahlvernadeln einer gegenüberliegenden zweiten Oberseite des Fasergeleges
• e) Bereichsweises Wasserstrahlvernadeln einer der Seiten des Fasergeleges derart, dass auf dieser Seite des Wattepads flächenhaft erstreckte Vertiefungen, die in Ebenenrichtung allseits von Erhebungen begrenzt sind, gebildet werden.

The present invention also relates to a method for producing a cosmetic cotton pad according to the invention. This process comprises the following process steps a) to e).

• a) feeding a fiber fabric
• b) moistening the fiber fabric
• c) water jet needling a first top of the fiber fabric
• d) water jet needling an opposite second upper side of the fiber fabric
• e) area-wise water jet needling one of the sides of the fiber fabric such that on this side of the cotton pad areally extending depressions, which are bounded in the direction of the plane on all sides of surveys are formed.

According to process step a) is a Fasergelege which either be immediately before in be random web forming process or taken from a storage station fed. This fiber fabric preferably comprises cellulosic fibers, in particular cotton and / or viscose fibers; but it can also additives synthetic fibers such. Example of polyester, polyamide, polyacrylic, polyolefins, polyurethane, as Merkmomponentenfasern, in particular as bicomponent fibers include, which are preferably as microfibers with a fiber thickness of ≤ 1 dtex, in particular as micro-staple fibers of a length of at least 7 mm, provided.

Preferably become cotton noils used previously in known treatment processes, such as degreasing, bleaching, carding or carding, were processed.

The supplied Fiber fabric is moistened in step b) in any desired manner. The step b) of moistening could also at the same time as the subsequent step c) of water jet needling a first surface performed the fiber fabric become. The moistening of the fiber fabric can, for example, also by water jets of a relatively small Water pressure between 2 to 8 bar, preferably between 3 to 7 bar, carried out become. By moistening the fiber material is easily puffed up and learns thereby a slight entanglement of the fibers also in the interior of the Fiber fabric. This step also serves to vent what a more even water needling of the fiber fabric in the next Step allows.

in the Process step c) is a first flat side or top of the Fiber-blended water jet needles. This will be a large number from jets of water coming from jet bars emerge and impinge on the first top of the fiber fabric, uses.

To the Water jet needles are nozzle bars with outlet openings for the Water jets with a diameter of less than 0.20 mm, in particular less than 0.15 mm, in particular between 0.13 and 0.10 mm used. In this case, preferably, nozzle bars are used with 40 outlet openings each 2.54 cm in length of the nozzle bar intended.

For water jet needling the mentioned first top of the fiber fabric are preferably pressures of 7 to 15 bar, particularly preferably from 8 to 12 bar used. This is the cotton pad over its entire first top continuous in the machine direction concerned water-jet needled.

in the subsequent Process step d) also becomes the opposite second flat side or top of the fiber fabric water jet needles, namely preferably by means of water jets, the one under process step c) higher Water pressure of 20 to 35 bar, preferably from 22 to 30 bar, stand. This results in a better depth effect and thus a higher proportion of entanglement and internal connection of the fiber fabric also in greater distance reached from the respective top.

After this process step, at least one upper side, preferably the first upper side of the fiber fabric after method step c), is subjected to further zone-wise water-jet needling in such a way that depressions extending in a planar manner on the side of the cotton pad and bounded or surrounded by elevations in the plane direction are formed become. To produce these elevations, water jets which are under a pressure of from 20 to 35 bar, in particular from 22 to 30 bar, are preferably used in process step e). As explained above in connection with the cotton pad according to the invention, the surface portion of these recesses is at least 55% of the considered total area of the upper side or flat side in plan view. Each individual (not open-edged) depression has an area of 5 to 85 mm ² .

These Depressions that are surrounded on all sides by elevations in the plane direction or are limited, are preferably using a template means formed, with the water jets directed to the stencil means and according to the openings this stencil agent be passed therethrough. The Recesses correspond to the recesses of the template means and the surveys correspond to the areas of the template which their openings surround.

Advantageously, stencils are used made of steel, which are suitable to withstand the application of water jet. The templates can be designed in any desired manner, in particular in a planar design. They are advantageously integrated in a rotatable drum. By rotation of the drum, the stencil means can roll at quasi machine speed and thus in speed of the fiber fabric, so that the fiber fabric as in an exposure process according to the Stencil openings are exposed to water jets. In particular, the drum itself could comprise a steel jacket which at the same time constitutes the template means.

Further Features, details and advantages of the invention will become apparent the drawing and the following description of inventive cotton pad. In the drawing shows:

1a a schematic representation of a plant for the production of cotton wool pads according to the invention;

1b a schematic representation of a template means of in 1 sketched plant and a three-dimensional surface structure of a cotton pad produced with the plant and punched out of the fiber fabric;

1c a partial sectional view of the cotton pad after 1b)

2 a diagrammatic representation of a preferred embodiment of a cotton pad according to the invention in plan view;

3 a 2 corresponding representation of a known cotton pad of the trademark "Siempre";

4 a 2 corresponding representation of another known cotton pad of the trademark "Duo-face" and

5 to 20 further embodiments of cotton pads according to the invention;

Figures schematic representation of the test setup for the 21a , b Determination of internal strength.

1 shows a schematic representation of a system for producing inventive cosmetic cotton pads. It becomes a fiber web formed just before 2 or a nonwoven fabric previously prepared in a separate process in a machine direction 4 fed to further treatment stations. In a humidification station 6 becomes the fiber fabric 2 passed under a curtain of under relatively moderate pressures of only 2 to 8 bar standing water jets. As a result, a wetting and only a very small entanglement of the fibers and a venting of the fiber fabric is effected. In a subsequent station 8th becomes a water jet needling a first top 10 of the fiber fabric 2 carried out, which means that water jets of an elevated pressure of 7 to 15 bar, preferably from 8 to 12 bar on this first surface 10 be irradiated. The water jets are generated by outlet openings 12 a nozzle bar 14 with an opening cross section of less than 0.2 mm, preferably from 0.13 to 0.10 mm. Inside the nozzle bar 14 In this case, a pressure of 5 to 15, preferably 8 to 12 bar provided.

In process step d), another water jet needling takes place at a subsequent station 16 where water jets those of the first top 10 opposite second top 18 of the fiber fabric 2 apply. The liquid is under a pressure of 20 to 35, preferably 22 to 30 bar.

Thereafter, in a third processing station 20 for carrying out the method step e) again the first upper side 10 fed to a further areawise water jet needling. Within a rotatable drum device 22 is a nozzle bar 24 arranged. A lateral surface 26 the drum 22 is as a template mean 28 trained and has a variety of in 1b ) (not in perspective correct) recesses shown 30 on the other hand, the relatively narrow webs 32 , which the lateral surface of the drum 22 form, are limited.

The drum 22 is at one of the machine speeds of the fiber fabric 2 driven corresponding circumferential speed, in the direction of the 1a ) counterclockwise. The water jets are then taken from the nozzle bar 24 from the inside to the drum 22 directed. They are from the webs 32 retained and reach the area of the recesses 30 on the fiber webbing moving at the same speed 2 , On the first top 10 of the fiber fabric 2 will then be in the 1b ) surface structuring with areally extending recesses 34 and the se depressions in the plane direction on all sides limiting surveys 36 educated. In the 1b ) is already one of the solidified Fasergelege 2 punched cotton pad according to the invention 38 shown. 1c ) shows a partial sectional view of the cotton pad 38 with elevations 36 and depressions 34 , Also visible is a groove structure 39 with a small groove spacing of 0.64 mm.

The cotton pad according to the invention 38 has a surface portion of the recesses 34 of 70.8% based on the total area of the first top 10 on. The individual surfaces are 24.4 to 32.1 mm ² . The width of the web-shaped elevations 36 is about 0.94 mm. The diameter of the cotton pad is 57 mm; It consists of 0.62 g of cotton fibers. It has a thickness of 3.1 mm (0.5 kPa) and a density of 0.078 g / cm ³ . Further details, in particular the standard deviations from the values given above, are given in Table I.

The cotton pad described above 38 is in again 2 shown.

The 3 and 4 show (in corresponding representation of the 2 ) Schematic representations of prior art cotton pads. So shows 3 a cotton pad known under the trade name "Siempre" with a percentage of the depressions on the total surface of the visible side of 33% with an area of 39.6 mm ^{2 of} the heart-shaped depressions. 4 shows elongated depressions with an area fraction of 40.5% of the total area of the visible side. The area of each well is 29.1 mm ^{2 in} each case.

Table I comprises, in addition to the cotton pad according to the invention 38 further cotton pads with embossed surface textures of the designations "Hartmann, embossed", "Luxana" (in two sizes) and "Tesco" (in two sizes). Furthermore, the two above-mentioned cotton pads of the brands "Duo-face" and "Siempre" are listed by means of water-jet needling. The values determined for pad weight, pad thickness, tear strength and internal strength are each given as the mean value of 10 individual measurements (n = 10) stating the standard deviation (except for pad diameter and density), unless explicitly stated in the table to 5 individual measurements (n = 5).

Then, the tear strength in the dry state and the internal strength also in the dry state were determined by the above-mentioned test methods. It can be seen that the cotton pad according to the invention of the embodiment described above is clearly superior to the cotton pads produced by water jet needling, both in terms of tear strength and internal strength. In this respect, reference is made to the values shown in Table I. Only the embossed product "Luxana" (dimension 90 × 70 mm) comes close to the determined value of 10.0 N / 25 mm in terms of the longitudinal tear strength of 9.9 N / 25 mm. The non-inventive embossed cotton pad "Hartmann" is 12.1 N / 25 mm even superior to the invention in consideration of the tensile strength in the longitudinal direction. The internal strength of the cotton pad according to the invention is with 0.75 N / 25.5 cm ² far superior to the considered here and measured known cotton pads.

The 5 to 10 show further exemplary embodiments of a cotton pad according to the invention with different surface structures. The structures are each formed by two parallel and intersecting wave structures. These are determined by the wavelength WL, by the height H (maximum to minimum) and by the distance Abst parallel waves from each other, each calculated from the web center. The structures are as in the previously described embodiment 2 around raised webs, which enclosing or delimiting two-dimensional depressions. Above a respective figure, the parameters WL, H, Abst. And below a respective figure, the percentage of the area of the wells and the individual area of a respective non-open edge recess and the web width of the surveys specified.

The 11 to 14 show structures with different parallelogram-shaped structures. For the distinction, the distance (distance) of the line-shaped elevations is indicated above the drawing.

The surface structures according to 15 and 16 are formed by an arrangement of a wave pattern and a linear pattern extending perpendicular thereto.

The 17 to 19 show a shingle or fan-shaped pattern formed from semicircular structures of radius 4 mm, 5 mm and 6 mm, respectively. 20 shows a surface structuring with circular elevations with a circle radius of 6 mm.

Claims (24)

Cosmetic cotton pad with elevations and formed by water jet needling, in the plane direction on all sides bounded by elevations areally extending depressions, characterized in that the area-extending wells have an area ratio of at least 55% of the total area of the considered flat side and that the cotton pad an inner strength of at least 0, 55 N / 25.5 cm ² has. Cotton pad according to claim 1, characterized that the areal extended wells provided only on one of the flat sides are. Cotton pad according to claim 1 or 2, characterized that the areal extended depressions accounted for at least 65 areas %, in particular of at least 75% and more particularly 85% to 95. Cotton pad according to one of the preceding claims, characterized characterized in that the areal extended depressions in the plane direction of surveys limited are whose width is less than 2 mm, in particular less than 1.5 mm, in particular less than 1.2 mm, in particular less than 1 mm and more particularly less than 0.95 mm. Cotton pad according to one of the preceding claims, characterized in that in the plane direction on all sides limited by a survey areally extending depression an area of 5 to 85 mm ^2, in particular from 10 to 70 mm ² , in particular from 15 to 55 mm ^2, and more particularly from 20 up to 40 mm ² . Cotton pad according to one of the preceding claims, characterized characterized in that the areal extended wells formed by water jet needling Groove structure with a groove spacing of 0.5 to 1.5 mm includes. Cotton pad according to claim 6, characterized the depth of the groove structure is 0.1 to 0.2 mm. Cotton pad according to one of the preceding claims, characterized in that it has a basis weight of 150 to 350 g / m ² , in particular from 200 to 280 g / m ² and more particularly from 220 to 260 g / m ² . Cosmetic cotton pad according to one of the preceding Claims, characterized in that its thickness is at least 2.6 mm, in particular at least 2.8 mm and more particularly at least 3.0 mm, measured at a test pressure of 0.5 kPa. Cotton pad according to one of the preceding claims, characterized in that it comprises an inner strength of - at least 0.60 N / 25.5 cm ^2, preferably of at least 0,65N / 25.5 cm ^2, more preferably of at least 0.70 N / 25.5 cm ² , particularly preferably at least 0.75 N / 25.5 cm ² . Cotton pad according to one of the preceding claims, characterized characterized in that it has a tensile strength in longitudinal and in the transverse direction of more than 7 N / 25 mm, in particular more than 9 N / 25 mm and more particularly more than 10 N / 25 mm. Cotton pad according to one of the preceding claims, characterized characterized in that its fiber content consists of 100% cotton. Method for producing a cosmetic cotton pad according to one or more of the preceding claims, the above method steps full: a) Feeding a fiber fabric b) moistening the fiber fabric c) water jet needling a first top of the fiber fabric d) water jet needling an opposite one second top of the fiber fabric e) Needle-wise water jet needling one of the sides of the fiber fabric such that on this page of the cotton pad areal extended depressions, in the plane direction of all sides of surveys are limited. Method according to claim 13, characterized in that that the moistening in process step b) with a liquid pressure from 2 - 8 bar, especially from 3 - 7 bar performed becomes. Method according to claim 13 or 14, characterized that the water jet needling in process step c) with a fluid pressure from 7 - 15 bar, especially from 8 to 12 bar performed becomes. A method according to claim 13, 14 or 15, characterized characterized in that the water jet needling in the process step d) and / or in process step e) with a liquid pressure of 20-35 bar, especially from 22 to 30 bar performed becomes. Method according to one of claims 13 to 16, characterized that for water jet needling in one or more of the method steps c) to e) outlet openings for the Water jets with a diameter of less than 0.20 mm, in particular less than 0.15 mm, in particular between 0.13 and 0.10 mm used become. Method according to one of claims 13 to 17, characterized that the areal extended depressions in process step e) formed thereby be directed that water jets on a stencil medium and according to the openings this stencil agent be passed therethrough. Method according to claim 18, characterized that the template means integrated into a rotatable drum is. Method according to claim 19, characterized in that the template means is a lateral surface of the rotatable drum forms. The method of claim 18, 19 or 20, characterized characterized in that in the stencil means the openings are limited by webs whose width is less than 2 mm, in particular less than 1.5 mm, in particular less than 1.2 mm, in particular less than 1.0 mm and more particularly less than 0.95 mm is. Method according to one of claims 17 to 21, characterized in that the openings of the stencil means used in each case an area of 5 to 85 mm ² , in particular from 10 to 70 mm ² , in particular from 15 to 55 m ² and more particularly from 20 to 40 mm ² . Method according to one of Claims 17 to 22, characterized that stencils are made of steel. Method according to one of Claims 17 to 23, characterized that the openings in the stencil agent by etching or generated by application of laser energy.