JP2005538260A - Apparatus and method for liquid permeable perforation of nonwoven fabric - Google Patents

Abstract

The present invention relates to a method for producing a perforated nonwoven fabric (2), in which perforating means are fitted into the nonwoven fabric. This punching means is arranged on the first roller (8). The punching means is inserted into the surface (15) of the second roller (10) through the nonwoven fabric. The perforating means displaces the fibers of the non-woven fabric so that the perforating means fits into the material on the second roller (10), which means can displace this material when it is fitted. In addition, corresponding devices and corresponding materials are also provided. It is an object of the present invention to provide a method and apparatus that can maintain the technical costs for producing perforated nonwoven fabrics at a low level, but at the same time enable a high production rate.

Description

  The present invention relates to a method for producing a perforated nonwoven fabric, in which a perforating means, in particular a needle, is fitted into the nonwoven fabric. Needles are positioned on the first roller, and these needles pass through the nonwoven fabric and fit into the surface of the second roller. In addition, a roll calendar for perforating the nonwoven fabric is provided, the roll calendar having a first roller and a second roller. The first roller has a punching means. A perforated nonwoven material produced using the method and / or roll calendar is also described.

  Calendars having a needle roller and a perforated roller, respectively, are described in EP-A-1048419 (A1) and EP-A-1046479 (A1). The needle of the needle roller fits into the corresponding diametrically opposite opening of the perforated roller and can therefore pierce the guided material through the gap formed by the perforated roller and the needle roller. The perforable material is a synthetic resin thin film, paper, or nonwoven material. The latter can be up to a few millimeters thick.

  It is an object of the present invention to provide a method and apparatus that can maintain the technical costs for producing perforated nonwoven fabrics at a low level, but at the same time enable a high production rate.

  This object is achieved by a method for producing a perforated nonwoven fabric having the features of claim 1 and a roll calendar for perforating the nonwoven fabric having the features of claim 10. Other advantageous embodiments are specified in the individual dependent claims.

  The method according to the invention for producing a perforated nonwoven fabric presents that a perforating means, in particular a needle, fits into the nonwoven fabric. These needles are positioned on the rollers, and the needles penetrate the nonwoven and fit into the surface of the second roller. The needles displace the nonwoven fibers and these needles fit into the material. This material is selected so that the needle can displace the material. In particular, the needle can displace the material so that there is a contour in the material. The needle is preferably reproducibly inserted into these contours. The contours are individually formed by first inserting the drilling means. The punching means is preferably fitted into at least part of the fibrous material forming at least part of the surface of the second roller. This displaceable material is in particular a felt material.

  According to one improvement, the piercing means is a needle. These needles can have various geometric shapes and cross sections. For example, the needle may be pointed or rounded, may have an undercut, and may be cylindrical or conical. Its geometry and cross section may vary over the length of the needle. Besides needles, for example, pyramids, stub shapes, in particular conical stub shapes, mushroom shapes, elliptical shapes with at least a partially rounded head can be used. The perforating means can also be produced from a solid by cutting, etching, or corrosion processing. The piercing means can also be integrated after heeling, for example by gluing, clamping, or another shape and / or friction method.

  The perforating means, in particular the needle, is preferably fitted into a felt material that forms the surface of the second roller. In this way, since the felt material is positioned on the second roller, the felt material constitutes one of the opposite sides of the needle, which not only can behave elastically but also has a certain hardness. Also have. The felt material is preferably capable of stabilizing the nonwoven on this roller so that when the second roller slides into the nonwoven, it displaces the fibers of the nonwoven laterally.

  According to one embodiment, the felt material used on the second roller is positioned on the second roller under mechanical tension. This results in a certain degree of strength of the felt material, in particular against the pressure applied by the needle and / or the first roller. In this way, the felt material can also behave elastically to some extent.

  According to one embodiment of the method, the first roller with the needle is driven, while the second roller with felt material on the surface is not driven directly. Rather than being driven directly, as the first roller moves, the second roller is reliably entrained by the needle fitting into the nonwoven material. In this way, the first roller and the second roller rotate in synchronization with each other. The felt material is preferably selected such that when the needle fits into the felt material, it always takes place at approximately the same location. Therefore, a hole into which the needle always fits is formed in the felt material. In this way, the wear of this felt material is limited when it is used on the second roller.

  According to another embodiment, the needle is heated. Heating to a temperature below the melting temperature of the nonwoven fabric or the decomposition temperature of the felt material is preferred. For example, the surface temperature of the needle can be set such that the nonwoven fibers are dissolved and / or softened, but the fiber structure itself is not destroyed. An improvement of the method presents attaching the felt material to the second roller as a shrink hose. Such shrink hoses are preferably seamless. The second roller preferably has a metal surface. The surface may be smooth or corrugated. The corrugation may be made, for example, as a helix, or in the form of a groove having parallel axes. It is also possible for the surface of the second roller to have a threaded groove with a left or right slope. The second roller, particularly the metal surface and the felt material, are preferably joined by applying pressure to the metal surface of the second roller. Furthermore, an adhesive can be applied between the felt material and the metal surface. Such adhesives are preferably re-degradable by the effect of, for example, alcohol or the like. In this way, the bond between the thin film material and the second roller can be released again. If the felt material wears excessively, it is replaced with new felt material. The other parts of the second roller need not be completely replaced.

  One improvement, which also represents a unique idea, presents the attachment of felt material to the carrier. The felt material with the carrier is then subsequently placed, for example on a roller. This carrier is preferably an exchange bobbin. This replacement bobbin is preferably pushed over the roller. The exchange bobbin and the roller are coupled by typical coupling, in particular by friction and / or shape matching. For example, a torque and groove system, threaded connection, or similar scheme may be used. It is preferable that the felt material is exchangeably attached to the carrier so that the carrier can be reused. With the support, in particular with the exchange bobbin, the felt material can be exchanged quickly. Thus, calendar downtime is minimized. The felt material and the carrier are coupled as described above, for example, in the context of coupling the felt material to the roller. It is preferable to use a synthetic resin material for the exchange bobbin. Only the shrink hose is placed on the replacement bobbin. The calendar roller may remain unchanged. By using multiple exchange bobbins, even the relatively short useful life of the felt material can be overcome immediately. With sufficient replenishment, the replacement bobbin can be replaced at the same time as the roll from the unwinder.

  According to another equally unique idea of the invention, the roll calendar is configured such that it can reach the counter roller from one side, for example so that the exchange bobbin can be exchanged. Such an exchange is preferably carried out while the other side remains in its position, for example in a bearing. If it is necessary to compensate for the weight of the counter roller, the calendar can be provided with a support for this purpose. Such a support, if not provided, absorbs the weight caused by loosening the now free side clamping of the counter roller. The support is preferably at least partially movable so that it is sufficiently protected when the replacement bobbin is covered and peeled off. A part of the support is movable, in particular along the axis of the counter roller. According to one improvement, the counter roller is supported on the free side by a wearable weight receiver. The weight receiver is, for example, screwed and extends along the axis of the counter roller. This force bearing is particularly long enough to allow the sleeve to be pressed and released.

  Another equally unique idea presents that the calendar has a roller changer for the counter roller. For example, if the first felt material is excessively worn and needs to be replaced, the first counter roller having the first felt material is moved away from the perforation roller and has the second felt material. The second counter roller of the calendar is brought into contact with the perforating roller. The first counter roller can now be removed to change the first felt material. For example, a roller changer for a calendar is disclosed in German Patent No. 10005306 (C1), and within the scope of the present disclosure, the entire disclosure, in particular with respect to calendar, roller change and roller operation, is disclosed. refer.

  For example, if the felt hose is placed on the cleaned surface of the second roller or the cleaned carrier and subsequently wetted by water heated to about 60-80 ° C., the appropriate pressure when using the felt hose Is obtained. In this case, it may be advantageous to add an additional wetting agent to the water, but it may be, for example, a detergent. In this way, the shrinkage of the felt hose is promoted. Subsequently, the felt hose is quenched with cold water and dried on the second roller, for example, at a temperature of 30-40 ° C. Thus, the coupling between the felt material and the second roller and / or the carrier is sufficiently realized, so that when the needle penetrates the felt material, slippage occurs between the felt material and the second roller. do not do.

  The surface of the felt material itself can also be treated. This is necessary, for example, when the surface of the felt material has signs of bulging or wear causing damage. It is also possible to treat the surface to be roughened or to reduce the degree of roughening. The latter can be done, for example, by lightly singing the protruding felt material fiber and then removing it using, for example, a brush.

It is preferable to use a felt material containing wool as the fibrous material. However, in some applications, it may be recommended to use other fibrous materials as the felt material. These may be, for example, flax or cotton, viscose, polyamide, polyacrylonitrile, polyester, polypropylene, aramid, polytetrafluoroethylene, polyamide, or polyphenylene sulfide. Wool has a long-term heat resistance of around 100 ° C., while at higher needle temperatures, for example, polyamide, polyester or aramid fibers are used. The special durability of the shrink hose used was obtained when it had a group F hardness according to German Industrial Standard 61200. Felt material preferably has a total density of between 0.32 g / cm ³ and 0.48 g / cm ^3. The felt material preferably has a felt thickness of more than 5 mm, in particular a felt thickness of more than 8 mm, preferably more than 10 mm, for example up to 15 mm. Preferably, the felt hose comprises a F2 compliant wool felt having a wall thickness of about 10 mm and a density of 0.36 g / cm ³ .

  The use of a felt hose and / or felt material provides the other advantage that little need to consider the thermal expansion of the needle and / or the first roller. In particular, when the first roller accompanies the second roller, the needle and its fit in the felt material are automatically synchronized. Furthermore, in one embodiment, it is proposed that the material of the second roller has less elasticity than the felt material that forms the surface of the second roller. The second roller is preferably made of metal, in particular alloy steel. In another embodiment, it is proposed that the second roller comprises a synthetic resin, preferably made largely from synthetic resin. Furthermore, the second roller may be a hollow roller.

  The gap between the first roller and the second roller is set so that the needle that penetrates the nonwoven fabric displaces the fibers of the nonwoven fabric and compresses the felt material, compressing the fibers and stabilizing the holes in the nonwoven fabric. It is preferable. Depending on the speed of the roller and the nonwoven guided through it, the pressure applied, the temperature, and other parameters, these holes may take, for example, a funnel shape. Furthermore, the use of felt material on the second roller allows a great variety of needle shapes to be used. They may be pointed, conical, rounded or otherwise shaped. Their cross-section may be square, star-shaped, circular, semi-circular, letter-shaped, or a mixture of all of these.

  According to one improvement, the needles are specially shaped so that at least some of the fibers are displaced from the nonwoven when they are inserted. In such a case, the fibers form a structure that deforms corresponding to the shape of the needle. The structure preferably rises from the surface of the nonwoven fabric after the nonwoven fabric passes through the first and second rollers. Another embodiment of the method presents that at least a portion of the fiber is also drawn into the felt material when the needle fits into the felt material. Thereby, when the nonwoven fabric is next pulled away from the second roller, the existing texture of the nonwoven fabric surface may become more prominent. For example, the fibers can be pulled out by attaching in the felt until the bond between the felt and the fiber breaks.

  According to another idea of the invention, a roll calendar for perforating a non-woven fabric is provided, the roll calendar having first and second rollers. The first roller has a punching means protruding from the surface of the first roller. The first and second rollers form a gap through which the nonwoven fabric to be perforated is guided. The second roller has a felt material as a surface, and the gap between the first roller and the second roller is set so that the punching means fits into the felt material. In one refinement, it has been proposed that the gap between the first roller and the second roller can be varied. In particular, the gap can be set so that the needle used does not fit completely in the felt material and the nonwoven guided through, but only to a certain extent.

The needle roller preferably has a circular needle shape. The needle diameter preferably has a value between 1 mm and about 3 mm. The area of the needle is in particular between 1.5 mm ² and 5 mm ² , the density of the needle is preferably between 8 and 25 per cm ² and the area component of the needle is between 30% and 70%. It is preferable. The insertion depth of the needle in the felt material is preferably between 2 mm and 6 mm. The gap between the first roller and the second roller is preferably set so that the needle is not completely inserted through the felt material and the nonwoven fabric. In another embodiment, the gap has dimensions such that the nonwoven guided between the rollers is compressed simultaneously with the perforation. For example, for this purpose, the nonwoven can be subjected to pressure and / or temperature, which is applied to the nonwoven by a first roller or part thereof.

  Typical needle roller data is listed in the table below, which was used to perforate various nonwoven fabrics on the second roller in interaction with the felt material.

針ローラおよびフェルト被覆したカウンタ・ローラを使用して測定した様々な実験の典型的な測定データを下表に列挙する。

Typical measurement data for various experiments measured using a needle roller and a felt coated counter roller are listed in the table below.

Ａ：ポリプロピレンのスパン結合不織布
Ｂ：ポリプロピレンのスパン結合不織布＋ポリエチレン／ポリプロピレン複合繊維のスパン結合不織布
表示の実験では、スクリーン・ベルト速度が９５ｍ／分であった。

A: Polypropylene spun-bonded non-woven fabric B: Polypropylene spun-bonded non-woven fabric + polyethylene / polypropylene composite fiber spun-bonded non-woven fabric In the experiment, the screen belt speed was 95 m / min.

The perforating means, in particular the needle, is preferably implemented to perforate the nonwoven so that the nonwoven is permeable to liquids. In this case, it has been found particularly suitable to use a pre-bonded nonwoven as the nonwoven used. It is preferable to use a single layer nonwoven fabric. For example, a spunbond nonwoven made mostly of polypropylene is used, but it is a single layer. Such a spunbonded nonwoven fabric preferably has a weight between 20 g / m ² and 40 g / m ² . The basic weight is preferably about 30 g / m ² . The prebonded nonwoven has a bonded area of 14.49%, for example, in the form of heat fusion bonding. The nonwoven fabric preferably has a bonded area between 10% and about 60%. In addition to heat fusion bonding, the nonwoven fabric can have its stability and strength by other bonding methods such as jet water flow bonding, adhesives, tacky fibers, ultrasonic welding and the like. The dimension of the created hole was, for example, 1.09 mm ² as the area of the hole, the average length in MD was 1.35 mm, and the average length in CD was 1.04 mm. The used needle roller was heated from the inside using heat transfer oil for this purpose, and the surface temperature of the needle roller was set between 105 ° C and 130 ° C. Using a single layer nonwoven, hole dimensions with an axial ratio of about 1 MD to CD were achieved. In this case, speeds up to 95 m / min were used.

Other experiments were conducted, for example, on a two-layer nonwoven fabric. The first layer was made from a polypropylene spunbonded nonwoven and the second layer was made from a composite fiber material. The two-layer nonwoven was prebonded and had a bonded area of about 17%. Particularly suitable and stable circular perforations were obtained for basis weights between 30 g / m ² and 40 g / m ² .

  In particular, it is preferred to use a prebonded nonwoven fabric for perforation with a bond area between 8% and 25%.

  In addition to the listed polypropylene and polyethylene materials, the nonwoven fabric is made of other materials such as polyamide, polyester, glass fiber, PET, viscose, acetate, polyacrylic, polystyrene, polyvinyl chloride, copolymers thereof, and Mixtures of these may be included. In particular, it is also possible to use a composite fiber or a multi-fiber nonwoven fabric made from these materials.

  Other advantageous embodiments and improvements can be inferred from the following drawings. Rather than limiting the present invention as such in the embodiments of the drawings of the present invention, the features illustrated in the drawings may be further improved in combination with the embodiments of the present invention described above. Is possible.

  FIG. 1 shows a first device 1 for producing a perforated nonwoven fabric 2. A pre-bonded nonwoven fabric 3 is guided from an unwinder 4 to various roll guides 5 and tension adjusting rollers 6 to a roll calendar 7. The roll calendar 7 includes a first roller 8 having a needle 9 as a punching means and a second roller 10. This second roller 10 is preferably made of metal and has a felt material 11 on its surface. The felt material 11 is preferably a shrink hose 12. The contraction hose 12 is pressed over the second roller 10, and the inner surface 13 of the contraction hose 12 is in contact with the metal surface 14 of the second roller 10. Accordingly, the surface 15 of the shrink hose 12 forms the outer surface of the second roller 10 at the same time. The needle 9 of the first roller 8 is fitted into the surface 15. The pre-bonded non-woven fabric 3 is now guided to the roll calendar 7 as it first rests on the second roller 10. The pre-bonded nonwoven fabric 3 preferably has a loop angle greater than 90 ° around the second roller 10, in particular a loop angle greater than 120 °, preferably greater than 180 °. This stabilizes on the felt material 11, thereby reducing the tension in the nonwoven fabric before it is perforated by the needle 9. In particular, the wrinkles of the non-perforated nonwoven fabric 3 can be stretched in this way. It is preferred that the prescribed tension is applied to the nonwoven fabric. This tension can be detected, for example, by at least the tension adjusting roller 6 and can also be adjusted by the position adjuster.

  It can also be seen from FIG. 1 that the gap 16 between the first roller 8 and the second roller 10 can be adjusted. The position of at least one of the two rollers 8 and 10 can be changed. In this way, the drilling depth of the needle 9 in the felt material 11 can be adjusted. The adjustment of the drilling depth can be inspected immediately after drilling, for example, by checking the drilled image of the punched nonwoven fabric 2. This can be done in particular automatically. For example, the quality can be checked immediately by the detection unit, preferably by the camera and pre-selectable parameters, and appropriate adjustments can be made when variations occur. For example, it can additionally inform when the felt material has to be changed. After perforating the unperforated nonwoven fabric 3 with the needle 9, according to another unique idea, the perforated nonwoven fabric is wound immediately using a winder without being pulled out of the gap 16. This non-woven fabric is not pulled out but stays on the first roller 8 and is further guided according to the rotational direction indicated by the arrow. The perforated nonwoven fabric 2 is preferably guided along a loop angle greater than 90 °, in particular within an angle greater than 120 °, preferably in the range from 160 ° to 270 °. Only after being guided in this way is the perforated nonwoven fabric 2 pulled away from the first roller 8 and thus from the needle 9. Guiding the nonwoven fabric in this way has many advantages. That is, first, the temperature of the needle is sufficiently heated, and the perforation in the nonwoven fabric can be stabilized. In this case, stabilization can be achieved by transferring heat more evenly and in particular more slowly to the nonwoven fibers surrounding the needle 9. This not only makes it possible, for example, to soften the nonwoven fibers that are in direct contact with the needle 9. Not only that, but preferably the larger winding angle also makes it possible to at least soften the fibers of the nonwoven located adjacent to the needle. When softened, the fiber surfaces pressed against each other are preferably in close contact with each other. In this way, the assumed structure and geometric shape can be stabilized. Furthermore, when the nonwoven fabric is guided in such a manner, the needles 9 are inserted into the perforated nonwoven fabric 2 and the nonwoven fabric is further guided on the surface of the felt material 11, whereby the fibers of the nonwoven fabric are mutually compressed. It becomes possible. This also leads to stabilization of the perforated structure created in the nonwoven fabric by the needle 9. The perforated nonwoven fabric 2 is guided from the first roller 8 to the second tension measuring roller 17. From there, the perforated nonwoven fabric 2 reaches the winder 18 via the web guide 5. The tension measuring roller 17 makes it possible to repeatedly check the stress applied to the nonwoven fabric during the perforating process and to adjust the speed of the winder 18 and / or the winder 4 accordingly. Furthermore, the speed of the first roller 8 and / or the second roller 10 can be adjusted so that the desired tensile stress acts on the nonwoven.

  FIG. 2 shows details from FIG. It can be seen that the needle 9 is fitted in the felt material 11 of the contraction hose 12. A typical structure of the first roller 8 is schematically shown. The needle 9 is introduced into the surface of the first roller 8. It is known in the related art that the purpose of providing a needle or other drilling means in the first roller 8 can be realized structurally. See, for example, the related art documents cited above within the scope of this disclosure.

  FIG. 3 shows a single-layer nonwoven fabric 19, and FIG. 4 shows the perforated state. The single-layer nonwoven fabric 19 is preferably a spun-bonded nonwoven fabric. The perforation is performed in particular so that the nonwoven fibers protruding from the surface form a funnel-shaped structure.

  FIGS. 5 and 6 show a two-layer nonwoven fabric 20 that is closely laminated prior to perforation or is closely laminated by a perforation process. The first layer 21 and the second layer 22 are drilled simultaneously. In this case, the funnel-shaped structure of the first layer 21 is preferably formed to extend into the latter so that the second layer 22 has a substantially smooth surface without further bulging. However, the nonwoven fabric fibers from the first layer 21 and / or the second layer 22 may rise from the surface of the two-layer nonwoven fabric 20 depending on the depth to which the needle penetrates.

  FIG. 7 shows the replacement bobbin 23, which is preferably made from a synthetic resin. In particular, the shrink hose having the felt material 11 is attached to, for example, an exchange bobbin. The felt material 11 can be removed again from the replacement bobbin 23 so that a new shrink hose can be placed on the replacement bobbin 23 again after dredging. The exchange bobbin 23 preferably has a certain elasticity and / or can be deformed to some extent. For example, in this way, the pressure acting on the exchange bobbin 23 from the shrink hose can act on the calendar counter roller, which is positioned diametrically opposite the perforation roller. In particular, the pressure is so great that the replacement bobbin 23 can be held at least attached to the counter roller.

  FIG. 8 shows a schematic view of the calendar 24, which can be reached from the side. Thus, the surface on the second roller 10 can be exchanged without the need to remove the second roller 10. For this purpose, the holder 25 and / or the cover can be turned sideways or shifted upwards or downwards. Thus, the second roller 10 can be freely reached from the lateral direction. In particular, the roller structure of the second roller 10 and the corresponding dimensions and weight can be designed such that the holder on one side of the calendar 24 is sufficiently resistant to the weight of the second roller 10. This may be true not only when the calendar 24 is idle, but also when the calendar 24 is operating. For example, the second roller 10 may be a hollow roller and may be made from a lightweight material and / or at least partially made of synthetic resin or aluminum. Using the fact that only one side can be fastened, the second roller 10 can be pulled out of the calendar frame, and the surface of the second roller 10 can be exchanged.

  The structure and operation scheme of the schematic diagram shown in FIG. 9 corresponds to those of the arrangement known from FIG. Further, FIG. 9 illustrates the principle, and accordingly, the second roller 10 can be replaced with the third roller 26 by an exchange mechanism. Thus, for example, the second roller 10 can be replaced while the third roller 26 is engaged with the first roller 8. For this purpose, the roll calendar 7 has, in addition to the third roller 26, for example, a lever mechanism 27 that interconnects the second roller 10 and the third roller 26. The lever mechanism 27 is moved around an axis (not shown in detail) as indicated by an arrow. For example, the second roller 10 moves away from the first roller 8. On the contrary, the third roller 26 moves toward the first roller 8. It is preferable that the fine adjustment of the distances of the individual rollers 10 and 26 to the first roller 8 can be performed separately from the lever mechanism 27. When the third roller 26 engages the first roller 8, the nonwoven fabric to be perforated can be guided to the first roller 8 along the third roller 26 as indicated by the dashed line. The position of the tension measuring roller 17 is preferably adaptable to the position of the third roller 26. In this way, even if the third roller 26 is in operation, the tension measurement is reliably performed.

FIG. 1 shows a first apparatus for producing a perforated nonwoven fabric. FIG. 2 shows details from FIG. FIG. 3 shows the single-layer nonwoven fabric before perforation. FIG. 4 shows the single layer nonwoven from FIG. 3 after perforation. FIG. 5 shows the two-layer nonwoven fabric before drilling. FIG. 6 shows the two-layer nonwoven fabric from FIG. 5 after perforation. FIG. 7 shows the material on the replacement robin, in particular the felt material. FIG. 8 shows a schematic view of a roll calendar, in which the rollers into which the perforating means can be inserted are reachable from the side for the replacement of the surface material. 9 shows a schematic diagram of another roll calendar, in which rollers can be replaced.

Claims (29)

A method for producing a perforated nonwoven fabric (2), wherein a perforation means is fitted into the nonwoven fabric, the perforation means is disposed on a first roller (8), and the perforation means penetrates the nonwoven fabric. Inserted into the surface (15) of the second roller (10),
The perforating means displaces the fibers of the non-woven fabric so that the perforating means fits into the material on the second roller (10), which can displace the material during the fitting. Method. 2. Method according to claim 1, characterized in that the perforating means are fitted into a material, preferably at least partly forming the surface of the second roller (10). The method according to claim 1, characterized in that the perforating means is heated to a temperature below the melting temperature of the nonwoven fabric or the decomposition temperature of the material. Method according to claim 1, 2 or 3, characterized in that felt material (11) is used. Method according to claim 4, characterized in that the felt material (11) is positioned on the second roller (10) as a shrink hose-type coating. The punching means according to one of the preceding claims, characterized in that the fibers of the nonwoven fabric are displaced and pressed against the material (11), thereby compressing the fibers and stabilizing the holes in the nonwoven fabric. Method. When the perforating means is inserted, at least part of the fibers are pushed out of the nonwoven, whereby the fibers have the shape of the perforating means correspondingly, the nonwoven being first (8) and second ( 10) The method according to claim 6, wherein a structure that rises from the surface of the nonwoven fabric after passing through a roll is formed. 8. A method according to claim 6 or 7, characterized in that at least part of the fibers are drawn and drawn into the material when the perforating means is fitted into the material. Method according to one of the preceding claims, characterized in that the perforated nonwoven fabric (2) is detected. A roll calendar (7) for perforating a non-woven fabric, the roll calendar (7) having first (8) and second (10) rollers, wherein the first roller (8) is: Having a perforating means projecting from the surface of the first roller (8), and the first (8) and second (10) rollers form a gap (16) through which to drill The nonwoven is guided,
The second roller (10) is made of a material whose surface can be displaced by the punching means, and the gap (16) is set so that the punching means fits into the material. Calendar (7). 11. A roll calendar (7) according to claim 10, characterized in that the gap (16) is changeable. The roll calender according to claim 10 or 11, wherein at least a part of the material is a fiber. Roll calender according to claim 10, 11 or 12, characterized in that the material is a felt material (11). 14. Roll calender (7) according to claim 13, characterized in that the felt material (11) is at least 6 mm thick. 15. Roll calender (7) according to claim 13 or 14, characterized in that the felt material (11) is a shrink hose coating. The roll calendar (7) according to claims 13 to 15, characterized in that the felt material (11) is arranged on the second roll (10) under mechanical tension. 17. A bonding material according to claim 13, characterized in that a bonding material that provides a bond between the felt material (11) and the second roll (10) is applied on the second roll (10). Roll calendar according to item 1 (7). 18. A roll calendar (7) according to one of claims 10 to 17, characterized in that the second roll (10) is driven. 19. Roll calender according to one of claims 10 to 18, characterized in that the perforating means are needles (9) which can perforate the nonwoven so as to make it permeable to fluids. 7). Roll calendar (7) according to one of claims 10 to 19, characterized in that a carrier on which the material (11) is arranged is placed over the second roller (10). ). 21. A roll calendar (7) according to one of claims 10 to 20, characterized in that a detection unit for detecting the perforated nonwoven fabric is arranged on the roll calendar (7). 11. The roll calendar (7) has an exchange device for exchanging a second roller (10) engaged with the first roller (8) by a third roller. A roll calendar (7) according to item 1 to 21. The roll calender (7) can reach the second roll (10) from the side to cover and peel off the felt material (11). Roll calendar according to item 1 (7). A material for use on a counter roll of a perforating roll, said material being a felt material (11) positioned on a carrier. The material according to claim 24, characterized in that the material is positioned on a replacement bobbin. Use felt material (11) as surface material for counter rolls of perforated rolls. A perforated nonwoven fabric produced by the method according to claim 1 and / or using the calender roll (7) according to claim 10,
The non-woven fabric has a basis weight between 20 g / m ² and 40 g / m ² , has a bonding surface reaching between 8% and 25%, and has perforations that are substantially circular, A porous nonwoven fabric characterized by having a diameter of 0.1 cm to 2.0 cm. The perforated nonwoven fabric according to claim 27, wherein the nonwoven fabric is a single-layer spun-bonded nonwoven fabric, at least most of which is made of polypropylene. 28. The nonwoven fabric according to claim 27, wherein the nonwoven fabric is a two-layer spunbonded nonwoven fabric, the first layer comprises a spunbonded nonwoven fabric that is polypropylene, and the second layer comprises a material that is at least a composite fiber material. Perforated nonwoven fabric.

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