MXPA06009259A - Hook fiber - Google Patents

Abstract

The present invention is directed at a hook strand. These hook strands have a base layer with first top face and a second bottom face and two side faces. Hook elements on the strand extend from at least one face and the hook elements have engaging arms that extend at an angle of from 1 to 90 degrees relative to the longitudinal extent of the strands.

Description

HOOK FIBERS FIELD OF THE INVENTION The present invention relates to hook fibers formed by extrusion for use with loops of loops and hooks.

BACKGROUND OF THE INVENTION A film extrusion process for forming hooks is proposed, for example, in U.S. Patent Nos. 4,894,060 and 4,056,593, which allows the formation of hook elements forming rails on a film backing. In place of the. Hook elements that are formed as a negative of a cavity in a molding surface, as is the more traditional method, the basic hook cross section is formed by a profiled film extrusion die. The matrix simultaneously extrudes film support and protrusion structures. The individual hook elements are then preferably formed from the shoulders by cutting the shoulders transversely, followed by stretching the extruded strip in the direction of the shoulders. The support is lengthened but the cut-off shoulder sections remain substantially unchanged. This causes the individual cut sections of the shoulders to separate from each other Ref. 175062 in the direction of elongation by forming discrete hook elements. Alternatively, using this same type of extrusion process, the sections of the shoulder structures can be milled to form discrete hook elements. With this profile extrusion, the basic cross section or profile is limited only by the shape of the die and the hooks can be formed so that they extend in two directions and have hook head portions that do not need to be tapered to allow extraction of a molding surface.

BRIEF DESCRIPTION OF THE INVENTION The present invention is directed to a hook filament. These hook filaments have a base layer with first top face and a second bottom face and two side faces. The hook elements in the filament extend from at least one face and the hook elements have coupling arms extending at an angle from 1 to 90 degrees, preferably 30 to 90 degrees relative to the longitudinal extension of the filaments . A preferred method for forming the hook filaments of the invention generally includes extruding a thermoplastic resin through a matrix plate, the matrix plate being shaped to form a base film layer and spaced protrusions or protuberances projected from one or both surfaces of the base layer. The spaced protrusions or protuberances formed by the matrix are precursors used to form the set of hooks on one or both of the upper and / or lower face of the filaments. The hooks are formed by at least partially cutting the ridges or protuberances and stretching the shoulders and / or the base layer to cause the cut portions to separate. Additionally, the sets of hooks on the side faces of the filaments can also be formed by transversely cutting the base layer at locations spaced along a length, at an angle transverse to the protuberances or ridges, to form discrete cut base portions. Subsequently, the longitudinal stretching of uncut portions of the base layer or the protrusions (in the direction of the protuberances or the machine direction) separates these cut portions from the protuberances and / or support, the cut portions then form the structures of hook. Stretching can also orient (molecular orientation created by stretching) the formation of filament base layer material by increasing the strength and flexibility of the filaments. In a preferred method, a die plate is formed to form a base film layer and protrusions, ridges or spaced hook-forming elements projecting from both surfaces of the base layer and / or hook-forming flange structures in the base layer. The initial hook members are formed by transversely cutting protuberances and / or the base at locations spaced along their lengths to form discrete cut portions of the base and protuberances. Subsequently, the longitudinal stretching of the protuberances or support layer (in the direction of the protuberances in the machine direction) separates these discrete sliced portions, the sliced portions then - form the hook members spaced apart, having a cross-sectional shape identical to the cross-sectional shape of the protuberances or cut-out base portion.

BRIEF DESCRIPTION OF THE FIGURES The present invention will be further described with reference to the accompanying figures in which like reference numerals refer to like parts in the various views, and wherein: Figure 1 schematically illustrates a method for making a filament of hooks as shown in figures 2-16. Fig. 2 is a perspective view of a precursor film used to make the hook filament of Fig. 4. Fig. 3 is a perspective view of a first embodiment of precursor film cut in accordance with the present invention. Figure 4 is a perspective view of a first hook filament embodiment in accordance with the present invention. Figure 5 is a perspective view of a second embodiment of precursor film used to make a filament of hooks as shown in Figure 7. Figure 6 is a perspective view of a second embodiment of precursor film cut in accordance with present invention. Figure 6a is a side view of a second embodiment of precursor film cut in accordance with the present invention. Figure 7 is a perspective view of an additional intermediate cut stretch precursor film according to the second embodiment. Figure 8 is a perspective view of the second hook filament embodiment in accordance with the present invention. Figure 9 is a perspective view of a third hook filament embodiment obtainable from the second precursor film embodiment of Figure 5.

Figure 10 is a perspective view of a third embodiment of precursor film cut in accordance with the present invention. Figure 10a is a side view of a third embodiment of precursor film cut in accordance with the present invention. Figure 11 is a version of a hook filament producible from the third precursor film embodiment according to the present invention having alternating slits on either side of the precursor film. Figure 12 is a fourth embodiment of the precursor film in accordance with the present invention. Fig. 13 is a perspective view of a cut precursor film of Fig. 12 in accordance with the present invention having cuts on both the upper and lower face of the precursor film. Figure 14 is a form of a hook filament producible from the fourth embodiment of the precursor film of Figure 13. Figure 15 is a perspective view of a fifth embodiment of the precursor film in accordance with the present invention. Figure 16 is a perspective view of a hook filament producible from the fifth embodiment of the precursor film of Figure 15 cut similarly to the hook filament of Figure 14. Figure 17 is a further embodiment of a hook filament similar to that of figure 16 produced from an alternative embodiment of the precursor film not shown.

DETAILED DESCRIPTION OF THE INVENTION The hook filaments are preferably made by a new adaptation of a known method of hook-and-loop fabrication from an extruded shaped film having hook-forming projections as described, for example, in the Patents from the United States Nos. 3,266,113; 3,557,413; 4,001,366; 4,056,593; 4,189,809 and 4,894,060 or alternatively 6,209,177. A first embodiment of a method for forming a film usable in forming the filaments of the invention is illustrated schematically in Figure 1. Generally, the method includes first extruding a strip or filament 50 such as strip 1., shown in Figure 2, of thermoplastic resin from an extruder 51 through a die 52 having an aperture cut, for example, by electron discharge machining, shaped to form the strip 50 with a base layer 3, and elongated spaced ridges 2 and / or 8 projecting from at least one surface 4 or 5 of the base layer 3 having a predetermined hook cross-sectional shape. If desired, a second set of protuberances or ridges 8 can be provided on the second surface 4 of the base layer 3, the second set of protuberances can have a predetermined shape of a desired hook element or portion. The strip 50 is pulled around the rollers 55 through a cooling tank 56 filled with a cooling liquid (e.g., water), after which the protuberances 8 and 2 are cut or slit transversely at spaced apart locations 9 or 9. 'along its lengths by a cutter 58 to form discrete cut portions 13 of the ridges or protuberances 2 and / or 8. The distance between the cut lines 11 corresponds to approximately the desired width-11 of the hook elements a be formed, as shown in Figure 4. The cuts 9 and 9 'can be at any desired angle, generally from 90 ° to 30 ° from the longitudinal extension of the ridges or protuberances 2 and 8. Optionally, the strip can be Stretch prior to cutting to provide additional molecular orientation to the base layer 3 or protuberances 2 and 8 and reduce the size of the protuberances or ridges 2 and 8 or the thickness of the base layer 6 and also reduce the size e the subsequent hook elements formed by grooving of the protuberances. The cutter 58 can cut using any conventional means such as rotating or oscillating blades, lasers, or water jets, however "preferably cut using blades oriented at an angle of approximately 60 to 90 degrees with respect to the longitudinal extent of the protrusions or ridges 2. After cutting the protuberances or ridges 2, 8 the strip 1, 50 is stretched longitudinally at a draw ratio of at least 1.5, and preferably at a draw ratio of at least about 3.0, preferably between a pair of ribs. press rolls 60 and 61 and a second pair of press rolls 62 and 63 driven at different surface speeds, this forms the hook element members 18 and 12. Optionally, the strip 50 can also be stretched transversally to provide orientation to the base 3 in the transverse direction The roller 61 is preferably heated to heat the base 3 prior to stretching, and the roller 62 is preferably cooled to stabilize the stretched base 3. The stretch originates spaces 30 between the cut portions 13 of the ridges or protuberances, the cut portions then become the hook elements 12 and 18 in the finished hook filament 19. The base layer 3 is then separated as with a longitudinal groove 53 along a cut line 7 between the protuberances, causing the base layer to separate into filaments. The base layer can also be cut or grooved prior to longitudinal orientation, in this case each individual filament is oriented longitudinally. The hook elements formed are generally rectilinear having two opposite flat faces'. The base layer can also be rectilinear. The hook elements 18 and 12 extend from a front face 14 and a rear face 15 of the filament 19. The hook elements may be directly opposite to each other or off-center, based on the location of the cuts formed in each of the shoulders. or protuberances 2 and 8. If the cuts are directly opposite each other on both sides the hook elements formed from the cut portions of the opposite protuberances will be directly opposite each other. If the cuts are off center, the hook elements will be off center. The hook elements formed can also be heat treated preferably by a non-contact heat source 64. The temperature and duration of the heating should be selected to cause shrinkage or thickness reduction of at least the head portion from 5 to 90 percent . The heating is preferably performed using a non-contact heating source which may include radiant heat, hot air, flame, UV, microwave, ultrasonic or IR focused lamps. This heat treatment can be on the entire strip containing the formed hook portions or it can be on only a portion or area of the strip. 0, different portions of the strip can be treated with heat to more or less degrees of treatment. In this way, it is possible to obtain on a single hook strip areas with different performance levels without the need to extrude different formed contour profiles. This heat treatment can alter the hook elements continuously or in gradients through a region of the hook strip. In this way, the hook elements can differ continuously through a defined area of the hook member. In addition, the density of the hook can be the same in the different regions coupled substantially with the same thickness or film support gauge (e.g., 50 to 500 microns). The caliber can easily be made the same as the hook strip and will have the same base weight and the same relative amount of material that forms the hook and support elements in all regions besides the difference in the shape of the hooks originated by the treatment with subsequent heat. Differential heat treatment may be along different rows or may extend through different rows, so that different types of hooks, such as hooks having different hook widths, can be obtained in single or multiple rows in the direction of the machine or the longitudinal direction of the hook strip. The heat treatment can be carried out at any time after the creation of the hook element, so that the manufactured operation can be created without the need to modify the manufacturing process of the basic hook element. With all these hook shapes, the hook dimensions and shape can be altered after heat treatment by at least the hook elements. The heat treatment tends to shrink the hook width in the direction that the ridges were extruded by relaxing any molecular orientation on the hooks as a result of the extrusion of the shoulders. In this case the width of the hooks may be less than that of the filaments from which the hooks project. The hook elements will generally have straight hook coupling arms and rods that are rectilinear. However, only the rods may be rectilinear if, for example, the rods are formed of protuberances or a base layer without a protruding element and / or flange and the protrusion is created after the formation of the rods such as by selective capping. . The plugging may be performed using a hot fastening point or other mechanism (which optionally uses heat with pressure) to deform the tip of a rod to form the projections in one or more directions. The deformation may be in a multitude (three or more) of directions or in the form of a (many or all radial directions). Examples of patents that describe various capping techniques include U.S. Patent Nos. 5,077,870 (Melbye et al.); 6,000,106 (Kampfer) and 6,132,660 (Kampfer). Suitable polymeric materials of which the hook filaments of the invention can be made include thermoplastic resins comprising polyolefins, for example polypropylene and polyethylene, polyvinyl chloride, polystyrene, nylon, polyester such as polyethylene terephthalate "and the like and copolymers and mixtures thereof Preferably, the resin is a polypropylene, polyethylene, polypropylene-polyethylene copolymer or mixture thereof Generally, these resins are inelastic which allows orientation of the uncut portion of the protuberances or film base layer Generally, the filament base layer will have a thickness from 25 to 150 μm, preferably 25 to 100 μm The formed hook filament 19 shown in Figure 4 has a continuous longitudinal base layer 10 having a front face 14, a face 15 and two side faces 16 and 17. The base layer 10 is comprised of a thermoplastic resin. Generally, the hook elements are also formed of the same thermoplastic resin but may be a different resin using, for example, a co-extrusion process as is well known in the art. If it is desired to form multiple layers, it is possible for the supporting portion of the filament to comprise a thermoplastic elastic material. The individual hook elements 18 and 12 are on opposite faces (14 and 15) of the base layer 10 and have hook coupling arms or projections 18 'and 18"which extend in a direction transverse to the longitudinal extension x of the base layer Preferably, the hook coupling arms 18 'and 18"will extend at an angle from 20 ° to 90 °, preferably from 30 ° to 90 ° from the longitudinal extension x of the base layer. It is important that the hook coupling arms do not extend in the same direction as the base layer making the hook coupling arms more easily accessible by suitable loop structures and the like. A second embodiment of precursor film is shown in Figure 5. The precursor film 20 has a support 23 having a front face 24 and a rear face 25. The front face 24 has a series of protuberances 28 extended in the longitudinal direction which have hook-loop precursor coupling arms or projections 26 at the terminal end of a portion of precursor rod 29 and preforming hook-forming ridges 27 adjacent to the protuberances formed directly on the support. The flanges 27 may be on one or both sides of the protuberances, and are in close proximity to the protuberances to form hook engaging arms or functional hook protrusions. As shown in Figure 6, this precursor film 20 is cut into opposite faces by partially cutting into the protuberances on one side, as shown by the cut lines 21, and cutting the backing layer 23, as shown with the lines of cutting 22, on the opposite face leaving a portion 31 of the stem precursor 29 uncut. This uncut portion of the rod precursor 29 of the protuberances 28 will eventually form the continuous support of the final formed filament. The uncut portions 31 of the rods 29 form the base layer of the hook filament 31 'after the stretching operation as shown in Figure 7 where the uncut portion 31' is now oriented and the projecting portions 26 of protuberances 28 are formed in hook elements 38. The shoulders 27 on the support then form the hook coupling arms 37, the arms 37 are created from the support layer after the oriented film is further cut longitudinally along of the longitudinal cutting lines 32. An alternative embodiment of this type of hook filament is shown in Figure 9 where instead of the film support 23 and protrusions 28 are cut to the same relative location in the direction of the longitudinal band, they are cut in an off-center manner resulting in off-center separation of the hook engaging elements 38 and 37 along the filament 39. In both embodiments, Figures 8 'and 9, the cutting frequency of the cut portion shown it is equal along the length of the precursor film resulting in equally spaced cut portions resulting in the creation of equally spaced hook elements 38 and 37 on opposite faces of the filament 39, however, the cutoff frequency may be random or at different spacings resulting in hook elements having different widths or frequencies along the longitudinal length of the filament support 31 '. Having hook elements on the opposite sides of the filament 39 'will increase the number of hook elements per unit length of the filament. The width of the individual hook coupling portions is determined by the cutting width or frequency of the cut portions. The spacing between the individual hook elements will be determined by the stretching ratio coupled with the cutting frequency. As such, the size and spacing of the hook elements on the opposite faces of the filament can be determined independently by the variations in the cutting frequencies of the opposite faces of the precursor film. Figure 10 depicts a third alternative embodiment of the precursor film cut in a particular new manner where the protrusions or protuberances 48 and 49 are provided in generally mutually opposite relation on the opposite faces of a film support 43. The individual shoulders and the support they are cut from any face at identical spacings and frequencies, but off-center by a predetermined distance 44. The support or base layer is cut substantially completely from both sides but in an alternate configuration and in the opposite protuberance in whole or in part but never at a point that the film is cut completely. The hook strip support 153 is formed by the alternate partially uncut portions of the stem regions of the protrusions 48 and 49, substantially as shown in Figure 11, connected by the cut portion of the bearing and protuberances. The hook filament 150 has hook elements 158 and 159 on opposite faces formed from the protuberances 48 and 49 respectively. Fig. 12 is a fourth embodiment of a precursor film used in accordance with the present invention, similar to the precursor film of Fig. 5, however it has hook-forming protrusions 161 and 162 on the opposite faces of the base layer. Similar to the embodiment shown in Figures 5-9, the base layer of the hook filament is formed of the same material as the protrusion 161. The hook precursor ribs 167 and Additional 167 'result in the formation of a hook filament which has hooks extended in four directions. This provides a hook element which has a substantially higher concentration of hook coupling elements per unit length. Hooks extended in two or more directions are important in the hook filaments used to form non-woven fabrics where randomly obtained filaments are entangled and / or entangled. When the fiber or filament is twisted, the hooks on a given face rotate out of the plane which may cause them to be directed into the fabric rather than outward. If a secondary hook is on the opposite side, the coupling is possible with this hook. As such, hooks on three or more sides of the filament additionally increase the likelihood that a given hook will be faced outward regardless of the degree of kinking in a fiber. The fibers can also be formed directly in a fibrous web for example by partial grooving or total grooving followed by hydroentangling. The greater concentration of the hook elements per unit length increases the likelihood that the hook elements will be extended out of the surface of the nonwoven or woven material. The probability that the hook elements extend outwardly into a fabric increases when the hook elements extend in more than two directions, particularly three or more directions as shown in the embodiments of Figures 14, 16 and 17. In these embodiments there may be from about 10 to 50 hook elements per centimeter of filament length or preferably 20 to 40. Generally, with the filaments of the invention the concentration of hook elements per centimeter is 5 or more, preferably 10 or more. . The hook filaments can comprise a composite fabric with a woven fabric where the composite fabric is formed by processes such as hydroentangling. The "hook filaments may also comprise a non-woven composite fabric where the hook filaments are mixed with other fibers in well-known nonwoven forming processes such as carding, meltblowing or spun bonding." The fibers with which the filaments of hooks are mixed can be elastic, inelastic, heat-sealable, crimped, non-crimped or any other type of fiber or mixture.This composite fabric could be useful in articles such as self-adhesive medical gowns or for applications type straps for tying. A fabric composed of hook filament may also form a closure element for use in a disposable article such as a diaper, a feminine hygiene article, a medical gown, surgical gown or similar items.The composite fabric is provided for another purpose , for example, such as the non-woven outer cover, or non-elastic or non-woven elastic back portion, of a diaper, the sun coupling of a female sanitary napkin, or a non-woven band where the composite fabric can be self-engaging or separately provided non-woven. The composite fabric may also be provided with at least one other element such as a laminate, such as ribbons, elastic fabrics, hook films, loop fabrics or the like. Fig. 15 is a further embodiment of the precursor film for forming a filament element as shown in Fig. 16 having hook engaging elements extended in four directions. The additional hook-coupling arms are provided on the hook members 88 having additional hook-forming ridges formed on the precursor shoulder or protrusion from which the hook element is cut. This can also be used to provide hook coupling arms on the hook members 89 and 87 as would be apparent to one skilled in the art by providing additional flange structures on these additional protrusions or on the support. The hook coupling elements can extend in more than four directions having additional protrusions extended from a base region or common base. For example, two or more protrusions may extend from a single support face, such as in a V-type wedge. In all the modes discussed above the protrusions are provided with at least two hook coupling arms, however, if desired, the Directionality can be provided by providing hook coupling arms in only one direction as shown in Figure 17 where the hook members 98, 97, 95 and 99 have hook engaging projections extended only in a single direction. They can all be in the same or different directions as shown in figure 17.

Test Methods Shear Strength The operation of the hook filaments was measured using a dynamic shear test. Two strips of 15 cm long by 2.5 cm wide of nonwoven loop material (sold under the designation KN-1971 by 3M Co., St. Paul, MN) were cut from a large material web. Samples of 5.1 cm long were prepared from the hook materials in filaments. A sample of the filament hook was placed on top of the non-woven side of the loop material and then attached to the nonwoven by placing a 4 kg weight on the hook and non-woven and then twisted several times back and forth . A second strip of the loop material was then placed, the non-woven side down, on the top of the hook / non-woven laminate, and then coupled with the laminate by twisting a weight of 4 Kg back and forth in the superior of the 3 components. The 3-component laminate was then mounted on an INSTRON constant speed extension testing machine (Model 1122, available from Instrom Corporation, Canton, Ma 02021) with an uncoupled end of the first strip of loop material in the jaws and the other non-coupled end of the second strip of loop material in the lower jaws of the test machine in a superimposed shear geometry. The jaws were separated at a speed of 30.5 cm / min with the maximum load recorded in grams. 10 replicates were tested and averaged together and presented in Table 1 below. The material of Example 1 having hook elements on two sides of the filaments exhibited approximately 12 times the shear strength as that of the material of Comparative Example 1 which had hooks on only 1 side of the filament.

Examples 1 A profiled hook fabric was made using the apparatus similar to that shown in Figure 1. A polypropylene / polyethylene impact copolymer (C104, 1.3 MFI, Dow Chemical Co., Midland, MI) pigmented with a color of Ti02 / polypropylene (50:50) concentrated to 1% by weight, was extruded with a single screw extruder of 6.35 cm (24: 1 L / D) using a barrel temperature profile of 177 ° C-232 ° C-246 ° C and a die temperature of approximately 235 ° C. The extrudate was extruded vertically downward through a die having an aperture cut by electron discharge machining to produce an extruded shaped cloth similar to that shown in Fig. 2. The spacing of the transverse fabric of the upper ridges It was 7 highlights per cm. After being formed by the matrix, the extrudate was cooled in a water tank at a speed of 6.1 meters / min with the water feeling maintained at approximately 10 ° C. The fabric was then advanced through a cutting station where the upper shoulders (but not the base layer or the lower shoulders) were cut transversely at an angle of 23 degrees measured from the transverse direction of the fabric. The spacing of the cuts was 305 microns. After cutting the upper ridges, the cloth was inverted and then the lower ridges were cut from below to the upper surface of the base layers. After cutting the upper and lower shoulders, the fabric was stretched longitudinally at a stretch ratio of about 3 to 1 between a first pair of press rolls and a second pair of press rolls to further separate the individual hook elements at about 8 hooks / cm. The thickness of the base layer was 219 microns. The upper roller of the first pair of press rolls was heated to 143 ° C to soften the fabric prior to stretching. The second pair of press rolls was cooled to about 10 ° C. The fabric was then advanced through a router apparatus where the base layer was slotted between the rows of the hook elements to produce filaments of hook material - having hook elements projecting from two sides of the filaments similar to those shown in Figure 4. The material was then tested for shear operation.

Comparative Example Cl To serve as a comparative example with hook elements projected from only one side of the filament, a commercially available extruded profile hook (KN-0645, 3M Co., St. Paul, MN), with a similar hook shape to that of the upper surface of the fabric shown in Figure 4, it was grooved between the rows of hook elements.

Table 1 It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is "that is clear from the present description of the invention.

Claims (17)

CLAIMS Having described the invention as above, the contents of the following claims are claimed as property:

1. Strand of hooks, characterized in that it has a base layer with at least a first face and a second face with integrally formed hook elements extended in a single row from at least one face having hook engaging arms extended at an angle from 1 to 90 degrees of the longitudinal direction of the filament, wherein the base layer is a oriented thermoplastic resin. A hook filament according to claim 1, characterized in that the hook filament is formed of a thermoplastic resin and the hook coupling arms extend at an angle from 30 to 90 degrees of the longitudinal direction of the filament. 3. Strand of hooks according to any of claims 1-2, characterized in that the hook coupling arms extend from two or more sides of the base layer. Filament of hooks according to claim 3, characterized in that the hook coupling arms extend from three or more sides of the base layer. 5. Strand of hooks according to claim 1, characterized in that the hook elements substantially have two opposite flat faces. 6. Strand of hooks according to claim 1, characterized in that there are from 10 to 50 hook elements per centimeter. 7. Filament of hooks according to any of claims 1-6, characterized in that there are at least 5 hook elements per centimeter. 8. Strand of hooks according to any of claims 1-7, characterized in that the base layer is essentially flat. 9. Strand of hooks according to any of claims 1-7, characterized in that the base layer is non-planar. 10. Filament forming method, characterized in that it comprises the steps of extruding a thermoplastic resin in a machine direction through a die plate having a continuous base portion cavity and one or more protrusion cavities extended from minus one face of the base portion cavity, form a film with a portion of base film with protuberances, cut the film on at least one face through the protuberances on at least one face, orient the cut film portion in at least one the longitudinal direction and forming the straight members and dividing the film between at least some of the cut and stretched protuberances creating the filaments. Method according to claim 10, characterized in that the protuberances are only partially cut. Method according to any of claims 10-11, characterized in that the cuts are at an angle from 30 ° to 90 ° of the longitudinal extension of the protuberances,. 13. Method according to any of claims 10-12, characterized in that the base layer is stretched at a draw ratio of at least 1.5 and the film is slit between substantially all the protuberances cut and stretched on at least one face. Method according to any of claims 10-13, characterized in that the base portion of the film is cut on one side and the protuberances are partially cut on the opposite side providing an uncut portion of the protrusions, the uncut portion forming the base layer of the filament 15. Method according to any of claims 10-14, characterized in that the film base layer is provided with protuberances on both sides and both sides are cut at least partially through both sets of protuberances. 16. Composite fibrous fabric, characterized in that at least some of the fibers forming the fabric are filaments of hooks wherein the hook filaments have a base layer with at least a first face and a second face with integrally formed hook elements extended from at least one side - in at least one row having hook-coupled arms extended at an angle from 1 to 90 degrees of the longitudinal direction of the filament. 17. The composite fibrous web according to claim 16, characterized in that the fabric is a non-woven fabric with hook filaments mixed with other fibers.