EP4378344A1 - Hook strap material and hook strap material roll and reel - Google Patents

Abstract

In order to provide a hook tape material or a corresponding hook tape material roll and a corresponding hook tape material spool in a wound-up state in a reliable manner, the back of the hook tape material is adapted in such a way that this back has a stabilizing effect in the wound-up state.

Description

The invention relates to a hook tape material. The invention also relates to a hook tape material roll and a hook tape material reel.

Hook tape material of the generic type serves as a semi-finished product for the manufacture of a component of mechanical fastening systems, in which the hooks of the corresponding component can engage in a second component of the mechanical fastening system, which for example provides loops to match this, in order to close a corresponding fastening in this way. For this purpose, a desired length of the hook tape material, over which the fastening is to work, is cut and applied in the desired manner in order to then form part of a fastening system. In a very rudimentary form, the hooks can be arranged on a front side and the loop material on a back side of a fastening tape for corresponding fastening systems, so that a self-closing fastening element can be provided, which can be used for example to wrap around and fasten cables, skis or as a sports bandage or medical bandage, such as the one used for example in the WO 2005/000065 A1 However, even in these cases, a hook tape material serves as a semi-finished product or intermediate product for the respective provision of the fastening system by combining it with a corresponding loop material.

There are a number of approaches to designing such hook tape materials, in particular to optimise their hooking properties for the formation of fastening systems, such as in the WO 2003/028499 A1 In particular, it is also suggested that the projection elements arranged on the front side of a corresponding film carrier of the hook tape material, which themselves can be formed into hooks in a variety of ways, be provided with their own structured surface in order to optimize the hooking properties. The EP 0 989 810 B1 and the EP 1 696 760 B1 disclose corresponding projection elements which are provided on the front side of a film carrier, which in turn have a structured surface on their front side and which are intended to enable improved hooking properties. There are also approaches to improve the overarching material properties of the hook tape material, such as the tear resistance, which EP 1 635 667 B1 or bending stiffness, which the US 2002/0116799 A1 improve, by providing the film carrier with a structured surface, be it the front or the back. The EN 10 2020 007 585 A1 discloses corresponding hook tape material, wherein structures on the front side of the projection elements or on the back side of the film carrier are intended to save material and, furthermore, it is found that corresponding structures reduce the bending stiffness and can serve as a collecting space, for example for adhesive for attachment to third-party components.

The corresponding hook tape material is made of a hardened plastic and has, for example, EN 10 2020 007 585 A1 , the EP 1 635 667 B1 or the EP 1 696 760 B1 disclose a flexible film carrier comprising a front surface and a back surface, the front surface of the film carrier having spaced and separated projection elements arranged thereon and the back surface of the film carrier having a textured surface.

Such hook tape material can be further processed, for example, to make fastener tapes. In order for the hook tape material to be further processed or to be delivered to customers as a semi-finished product for such further processing, it must be made available in some form for transport. For example, the hook tape material can be wound onto a spool or roll and thus provided wound onto a spool or roll.

Accordingly, when the hook tape material is wound up, the back and front sides lie directly on top of each other if the hook tape material is provided in the form of spools or rolls. After a certain number of windings and at higher winding and unwinding speeds, the hook tape material may no longer be able to be held reliably on the roll or spool. This is particularly true if, as is currently the case on the market, the narrowest and lightest fastener tapes are to be provided, which then requires narrowest and lightest hook tape materials. These can only be wound up cleanly with little tension and tend to slip the individual layers, particularly at higher rotation speeds, which then leads or can lead to malfunctions. To avoid these disadvantages, side disks are known, for example, which can be used effectively in rolls to prevent telescoping or individual layers from slipping. At higher rotation speeds, when the individual layers lift off from each other due to centrifugal force, for example, or with spools where individual turns can lie next to each other, it can still tangling can occur, which can then lead to production downtime. Similarly, reusable hook tape materials can be provided on spools or rolls, which should be easier to stabilize because they are wider and which then have to be separated lengthwise into individual pieces during further processing, which is not possible or desired for every user of the semi-finished products. Elaborate packaging for rolls or spools at risk is also used, which may be effective during transport and storage, but not during winding or unwinding. Among other things, the EP 3 072 484 B1 by increasing the stability of the rolls or spools through very complex winding structures and a complex construction of the hook tape materials.

Complex winding structures of strip materials in general are revealed by the US$6,209,814 . The winding of non-generic, complex band-shaped structures, such as the winding of multi-layered fastener tapes, is the subject of research by WO 2018/185677 A1 , the DE 295 22 068 U1 and the EP 2 906 071 B1 .

The DE 694 27 164 T2 discloses a pressure-sensitive adhesive for attaching individual lengths of hook tape materials to the back of the hook tape materials, so that a roll of these hook tape materials can be stabilized by the pressure-sensitive adhesive. The stabilizing effect of pressure-sensitive adhesives on the back of loop tape materials, which, as already explained above, can serve as the second component of a mechanical fastening system, is known for example from DE 94 21 906 U1 , from the DE 694 03 644 T3 , from the DE 694 29 366 T2 and from the US$3,341,004 known.

It is an object of the present invention to provide a hook tape material as well as a hook tape material roll or a hook tape material spool in a wound-up state in an operationally reliable manner.

The object of the invention is achieved by a hook tape material, a hook tape material roll and a hook tape material spool with the features of the independent claims. Further, possibly also independent of these, advantageous embodiments can be found in the subclaims and the following description.

In order to provide a hook tape material or a corresponding hook tape material roll and a corresponding hook tape material spool in a wound-up state in an operationally reliable manner, the inventive basic idea is to adapt the back of the hook tape material in such a way that it has a stabilizing effect in the wound-up state.

In order to be able to provide a hook tape material made of a hardened plastic in a wound state in an operationally reliable manner, a hook tape material made of a hardened plastic with a flexible film carrier comprising a front side and a back side is proposed, in which objected separate projection elements are arranged on the front side of the film carrier and which is characterized in that static friction increasing means are arranged on the back side of the film carrier.

Such static friction increasing agents can, as your description already shows, increase the static friction between the layers of hook tape material when it is wound, rolled up or spooled, so that a corresponding roll or spool can be stabilized accordingly. With a suitable design, this then enables higher winding or unwinding speeds or even larger roll or spool diameters, whereby the risk of telescoping or unwanted lifting of the individual layers due to high rotation speeds, which can lead to tangling or other failures, can be kept to a minimum.

Insofar as corresponding means for increasing static friction are provided only on the rear side of the film carrier, this in particular avoids any intervention in the projection elements, so that these can remain unaffected with regard to their actual task, namely to enable hooking, or so that any changes to the projection elements can be reduced to a minimum.

If necessary, the means for increasing the static friction can be provided by the back of the film carrier having a structured surface that increases the static friction. It goes without saying, however, that other measures, such as a targeted increase in electrostatic forces or similar, can also be used as means for increasing the static friction.

Cumulatively or alternatively, a hook tape material made of a hardened plastic with a flexible film carrier comprising a front side and a back side, in which spaced-apart, separate projection elements are arranged on the front side of the film carrier, can accordingly be characterized in that the back side of the film carrier has a structured surface and the surface of the back side of the film carrier, on the one hand, and the projection elements and/or a structured surface of the projection elements, on the other hand, form a positive connection parallel to the film carrier in order to To be able to provide hook tape material made of a hardened plastic in a wound up state in a reliable manner.

The form fit can increase the stability of a roll or spool made of such hook material, particularly against lateral forces, which can be caused by the tensions or pressures occurring in the spool itself, for example. With appropriate design and management of the winding and unwinding processes, the stability of such rolls or spools can also be increased when they are wound or unwound and the rotational movements of the centrifugal forces act on the wound or rolled up hook tape material. This also means that the corresponding rolls or spools can be provided in a reliable manner.

A hook tape material made of a hardened plastic with a flexible film carrier comprising a front side and a back side, in which spaced-apart, separate projection elements are arranged on the front side of the film carrier, can also be characterized in that the back of the film carrier has a periodically structured surface, wherein the projection elements have a periodically structured surface and the periodicity of the surface of the back of the film carrier is coordinated with the periodicity of the surfaces of the projection elements and/or wherein the projection elements form periodically arranged projections, the surface of the back side forms recesses, the periodicity of the projections and the periodicity of the recesses are coordinated with one another and the recesses in the surface are formed further than the projections, in order to be able to reliably provide a hook tape material made of a hardened plastic in a wound state.

Such a design makes it possible for either the projection elements themselves or their periodically structured surface to engage with the periodically structured surface of the back of the film carrier due to the coordination, whereby the stability between the individual layers of a roll or spool can be increased accordingly. This design can also reduce the risk of telescoping. Likewise, with a suitable design, a more stable winding in a wound state can be ensured even at higher winding or unwinding speeds and the risk of snagging can be minimized.

As already explained above, it is advantageous if the hook tape material is provided as a semi-finished product for further processing in the form of a hook tape material roll or hook tape material spool. For reasons of efficiency, it is sensible to have as much hook tape material as possible on one roll or spool.

In the present context, the term roll refers to a winding in which the respective strip material is wound layer upon layer without axial offset, i.e. without an offset parallel to the strip material surface in the transverse direction. Such a winding creates an essentially disc-like roll of the corresponding strip material, the width of which in the axial direction essentially corresponds to the width of the strip material in the transverse direction, i.e. perpendicular to the machine direction.

Such rolls in particular are relatively difficult to wind with large amounts of material in view of the material tension found in the strip material, since the outer layers exert a contact pressure on the inner layers and, for the stability of a roll, a sufficiently high material tension must be found in each layer, especially in the outer layers.

Accordingly, there are physical limits to the number of layers in a roll if it is to be sufficiently stable. It is naturally advantageous if as many layers as possible can be wound up, as this increases the amount of material provided by a corresponding roll, which can minimize transport costs and set-up times, for example.

In order to stabilize such rollers, it is particularly known to provide them with lateral guide discs. However, this means increased material expenditure and increased handling effort, so such lateral discs are dispensed with wherever possible.

In order to increase the amount of material in particular, it is known to increase the axial extension of the corresponding windings and, for example, to wind the strip material into a coil in a cross-like offset. In this way, the risk of telescoping, i.e. the risk that outer layers exert such great pressure on inner layers that these inner layers break axially, can be reduced. However, since in the edge areas strip segments still rotate around the respective winding axis or coil axis not offset but without offset, By using a coil-like winding, the risk of telescoping cannot be completely avoided, especially with very large coil diameters.

In addition, especially with coils with their crossing layers, there is a risk that at high speeds, outer layers in particular will lift off from the layers below them and individual strip segments will shift axially, which can then lead to blockages or crossings that disrupt the unwinding process or even cause accidents.

The above-described means for increasing static friction, the form fit formed parallel to the film carrier between the back of the film carrier and the projection elements or the coordinated periodicity of the projection elements or the structured surface of the projection elements and the back of the film carrier lead to axial stabilization when the hook tape material is suitably designed and/or when the process is suitably controlled during winding or unwinding, which reduces the risk of telescoping on the one hand and the risk of axial displacement of layers that have not been immediately removed or just wound on the other.

It is understood that, if necessary, tape sections that are wound up like rolls can also be provided axially next to one another on a spool, as is the case, for example, with EP3072484B1 discussed. In particular, in the case of a coil, it is not absolutely necessary that the respective band segments, which are wound in layers on top of one another, do not overlap. Overlaps can also be provided. Likewise, it is not absolutely necessary that the respective layers in a coil are wound strictly crosswise to form a coil. Here, too, deviations are possible without the stabilizing effects explained above being lost.

Depending on the specific implementation, rolls or coils can be wound or provided with a core or without a core. In both cases, it is advantageous if the respective rolls or coils are as stable as possible, so that the stabilizing measures explained above can be used advantageously regardless of this.

Any known tape material which can be made from a cured plastic and has a flexible film carrier and spaced apart projection elements can be used as the hook tape material.

Because the hook tape material is made of a hardened plastic, this semi-finished product can be molded from a plastic that is moldable and then hardens. Depending on the specific implementation, hardening can occur as a result of chemical reactions or physical reactions. In particular, plastics that are made up of several chemical components that react with one another and can be molded into a flexible film carrier can be used. On the other hand, thermoplastics are also suitable, as long as they are sufficiently stable when cooled but can be molded into a film carrier that is flexible.

Accordingly, any film-like configuration of the respective plastic which is flexible to the desired extent and can serve as a carrier for the spaced-apart, separate projection elements is suitable as a film carrier. In particular, such a film carrier can be a continuous sheet material representing a simple area, which preferably has no holes or perforations extending from one surface side to another surface side of the sheet material or the film carrier.

The hook tape material and in particular its flexible film carrier are preferably substantially longer in a machine direction than in a transverse direction thereto, so that this hook tape material can be fed to a processing machine as a semi-finished product with a relatively long length.

In particular, the film carrier is preferably relatively thin perpendicular to a plane spanned by the machine direction and the transverse direction, so that it is flexible in particular perpendicular to this plane. The front and the back of the flexible film carrier are then preferably each parallel to the plane spanned by the machine direction and the transverse direction.

By definition, the spaced apart, separate projection elements are arranged on the front side of the film carrier. The back side then forms the other of the two surfaces of the flexible film carrier arranged parallel to the plane spanned by the machine direction and the transverse direction.

Ultimately, the projection elements represent the hooks of the hook tape material, whereby these projection elements may already have sufficient hooking properties due to their design projecting from the flexible film carrier, in particular if they are desired to be essentially parallel to the machine direction or the transverse direction. In this respect, the projection elements can initially have any shape as long as they protrude or stand out from the flexible film carrier.

It is understood that the projection elements can be formed in one piece with the film carrier, whereby, depending on the specific manufacturing method, residues of attachments that were made during forming, for example, can be found between the projection elements and the film carrier. On the other hand, the projection elements can also be placed on the film carrier only after hardening or during subsequent re-softening. The projection elements are preferably connected in one piece with the film carrier. It is particularly preferred if the projection elements are molded at the same time as the film carrier and from a common material.

Depending on the specific requirements, the projection elements can have structures such as hooks, projections, thickenings, mushroom heads or the like in relation to their end pointing away from the film carrier. In particular, the surface of the projection element pointing away from the film carrier can optionally have a structured surface.

Furthermore, it is also conceivable that the projection elements themselves carry protruding structures, such as plates, mushroom heads or hooks, which are subsequently attached to the projection elements and only then become part of the projection elements.

In the present context, the term structured surface, as is intended in particular for the back of the film carrier, refers to any structure applied to the corresponding surface in a targeted manner, even if this is only characterized by a defined roughness or by statistical elevations and depressions or mountains and valleys. In particular, this can be, for example, EN 10 2020 007 585 A1 or the EP 1 635 667 B1 reveal, be regular structures which are present in a mesoscopic size which corresponds approximately to the width of the projection elements parallel to the front side of the flexible film carrier or the distance between the projection elements.

Any means by which the static friction between individual layers of the hook tape material can be increased when it is wound up by measures on the back of the film carrier can be used as a means of increasing the static friction. These can even be adhesives or electrostatic charges, for example, which can increase the static friction between the layers. In particular, the application of adhesives is in itself suitable for increasing the static friction in the case of corresponding semi-finished products. between the individual layers is not provided; at most, if the corresponding hook material is to be applied in an adhesive form elsewhere during processing, an adhesive could already be provided, whereby the problems explained above of layers lifting off from one another and telescoping or slipping may also occur in such cases, so that appropriate means of increasing static friction can be provided by a suitable variation of the adhesive that specifically takes these problems into account.

In particular, the static friction increasing means can act mechanically, which can be implemented, for example, by roughnesses that are adapted to the front or surface of the projection elements. This is advantageous because the surface of the projection elements that faces away from the front of the flexible film carrier comes into contact with the back of the film carrier of a different layer in a winding. If this surface of the projection elements is very smooth, it can be advantageous if the back of the film carrier is provided with a very low level of roughness, so that increased static friction can be caused by van der Vaals forces or electrostatic forces. On the other hand, it is also conceivable that the roughness of the back of the film carrier is adapted to the roughness of the corresponding surface of the projection elements, since experience has shown that greater differences in roughness can lead to a reduction in static friction.

The advantage of a mechanical effect of the static friction increasing agents lies in the fact that they can then be provided structurally in a relatively simple manner.

It is understood that the static friction increasing means can be provided in particular by a targeted structure on the back of the film carrier, for example by corresponding peaks and valleys.

Preferably, the static friction means are formed in one piece in or with the film carrier. This can enable particularly simple production, since the static friction increasing means can then be provided during the forming or primary shaping of the hook tape material or in a subsequent step, for example by milling, heating or etching out.

The aforementioned advantages also apply to the structured surface or a periodically structured surface, as can be provided, for example, on the back of the film carrier or on the surface of the projection elements, which are also preferably can be formed integrally with the respective component, i.e. with the film carrier or with the projection element.

It is understood that the back of the film carrier, regardless of which form of static friction increasing means is used, may have a structured surface, but this does not necessarily have to be the case, especially if the emphasis is on increasing static friction by van der Vaals forces or by electrostatic forces.

The form fit formed parallel to the film carrier, which ultimately minimizes the risk of the individual layers of a winding slipping, whether axially or in the direction of rotation, allows these layers to be stabilized against one another. It goes without saying that the form fit should preferably be easily releasable by lifting off the individual layers, so that the windings or layers can be unwound quickly and without too much interference with the layers still remaining on the spool or roll.

In this case, the positive locking can initially be achieved in any desired manner, in that the projection elements or a structured surface of the projection elements ultimately engage in some way in corresponding valleys of the structured surface of the back of the film carrier in order to provide the positive locking in this way, for example.

In this case, the projection elements themselves can already form mountains that can engage in suitable valleys of the structured surface of the back of the film carrier.

In this context, it is clear that the form fit does not have to withstand infinitely large forces, but that sufficiently steep slopes are sufficient to increase the stability of a winding. In this respect, the combination of the structured surface of the back of the film carrier on the one hand and the projection elements on the other, which can engage with each other parallel to the film carrier, can be sufficient, even to a very small extent, to enable the desired stabilization.

Likewise, peaks and valleys of the structured surface of the projection elements, i.e. the surface of the projection elements that faces away from the film carrier, can engage peaks and valleys of the structured surface of the back of the film carrier, even to a very small extent, in order to increase the stability of the winding and thus provide a corresponding form fit. In this respect, too, the form fit does not need to withstand infinitely large forces.

Ultimately, it is sufficient if the form fit can withstand forces that are approximately equivalent to the forces required to bend the film carrier. As long as the film carrier can be bent, it will usually be possible to break the associated form fit, whereby - as already mentioned above - this can already be sufficient to stabilize a winding, i.e. a spool or roll, to the desired extent compared to conventional windings.

In particular, it may be sufficient if the surface of the back of the film carrier and the projection elements or the surface of the back of the film carrier and a structured surface of the projection elements form a positive connection perpendicular to the machine direction or in the transverse direction. This alone can stabilize the respective winding, i.e. the spool or roll, in particular in the axial direction of the winding or in the transverse direction, since the winding comprises the hook tape material wound in the machine direction. On the other hand, a positive connection effective in the machine direction can also stabilize a winding, in particular in order to stabilize a hook material under inherent stress in a winding on the lower layers of the winding. Accordingly, a combination of the directions, i.e. perpendicular to the machine direction and perpendicular to the transverse direction or parallel to the transverse direction and parallel to the machine direction, in particular in a plane spanned locally by these directions, can have a corresponding stabilizing effect.

In particular, periodically structured surfaces can be used to specifically stabilize layers of hook tape material wound on top of one another if the respective periodicity is coordinated with one another.

Accordingly, it is advantageous if the periodicity of the structured surface of the back of the film carrier is adapted to the periodicity of the projection elements. This then enables the projection elements to come into contact with the periodically structured surface of the back of the film carrier in a harmonious and stabilizing manner. The same applies when coordinating the periodicity between the surface of the projection elements that faces away from the film carrier and the surface of the back of the film carrier.

A periodically structured surface can be provided in a particularly simple structural manner, since the corresponding periodicity is achieved by recurring structures of the respective tools used in primary forming or reshaping of the hook tape material. come, for example from rollers and the like, can be provided in a structurally simple manner.

In particular, it can be advantageous if the periodicity of the surface of the back of the film carrier and the periodicity of the projection elements perpendicular to a machine direction are the same. This enables a stabilizing alignment of the projection elements to the periodicity of the surface of the back of the film carrier, particularly perpendicular to a machine direction, which can advantageously serve to stabilize the surface in rolls, i.e. in a winding with coaxial layers lying one above the other. The latter also applies in particular to hook tape material segments that run essentially without lateral offset, for example in the area of the axial edges of coils, where stabilization of the respective layers may be desired in particular.

It is understood that the periodicities may also differ from each other by an integer number, so that, for example, only every second projection element engages in a corresponding valley of the surface of the back of the film carrier or vice versa.

Stabilization can also be achieved if the surface of the projection elements facing away from the film carrier has a periodicity that is the same as the periodicity of the surface of the back of the film carrier perpendicular to a machine direction or differs from it by an integer number. The respective surface structures of the projection elements and the back of the film carrier can then align with one another and stabilize one another.

On the other hand, if it is desired that, for example, in the case of a coil winding in the middle area, i.e. when the layers of the hook tape material are offset at an angle to one another, corresponding alignments and a corresponding engagement should result, the adjustment of the periodicity can also be carried out deviating from one or deviating from integer values in order to take into account the associated angles of the respective hook tape material segments which come into contact with one another.

Depending on the specific implementation, a corresponding form fit can be formed by suitably aligning the periodically structured surfaces to one another or the projection elements and the periodically structured surface of the back of the film carrier, which is accordingly advantageous.

It goes without saying that the periodicity of the structured surfaces or projection elements can also be introduced into the surfaces parallel to the machine direction and that these can be coordinated with one another if this appears advantageous. This can then in particular create a corresponding form fit, which can accordingly have an advantageous stabilizing effect.

The latter applies in particular if the recesses in the surface of the back of the film carrier are further developed than the projections formed by the projection elements, so that a corresponding engagement is possible even in the event of an offset or with a certain amount of play.

With a suitable design, the structured surface of the back of the film carrier with its positive connection or with its periodically structured and correspondingly adapted surface can thus form corresponding static friction increasing means, which are in particular formed integrally in or with the film carrier.

In particular, the surface or the structured surface can have a groove structure, wherein the groove structure preferably comprises peaks and valleys arranged parallel to one another. Such a design of the surface or the structured surface is structurally simple, apart from the formation of a positive connection or the use as a means of increasing static friction or a coordination with other structures is basically known from the prior art.

The grooves can be designed in a variety of ways. In particular, they can be tapered, rounded or trapezoidal.

Alternatively, a knobbly structure can be provided, for example, which has singular mountains, each surrounded by valleys.

As already explained above, the projection elements can form periodically arranged projections which can engage in recesses in the surface of the back of the film carrier. Accordingly, it is advantageous if the projection elements themselves form mountains which can preferably engage in corresponding valleys of the structured surface of the back of the film carrier.

Preferably, the peaks or valleys on the back of the film carrier extend over the entire width of the film carrier, the width in the present context preferably being defined perpendicular to the machine direction, and parallel to the transverse direction. This enables the largest possible surface area to be available for the static friction enhancers, the form fit or the stabilizing structures.

Preferably, the peaks and valleys are arranged parallel to the machine direction of the hook tape material, i.e. parallel to its longitudinal extension direction. On the one hand, this enables structurally simple production, since corresponding structures parallel to the machine direction can be introduced relatively easily into the projection elements or surfaces. In addition, such an alignment proves to be relatively insensitive if the residual stress of the hook tape material varies during winding or if different winding radii are present, since this has little or no effect on the periodicity or the distances between the peaks and valleys.

In particular, the peaks and valleys can be aligned in such a way that the peaks of the surface of the back of the film carrier engage in the valleys of the surface of the projection elements when two layers of the corresponding hook tape material are placed on top of each other. This enables the associated rolls or spools to be stabilized in the simplest possible construction. The latter also applies if the peaks of the surface of the back of the film carrier engage in the spaces between the projection elements, in particular if the projection elements themselves or the projections formed thereby serve as peaks.

Stabilization of the windings can also be achieved if the projection elements or the peaks of the surface of the projection elements engage in the valleys of the surface of the back of the film carrier.

The desired effects can already be achieved if a height between the mountain and its adjacent valley of a first of the two surfaces is greater than a height between the mountain and its adjacent valley of the second of the two surfaces, which is particularly true if the projection elements or the projections formed thereby are regarded as mountains. This makes it possible to provide one of the structures, for example the surface of the projections, with a significantly lower amplitude than the corresponding opposite surface, such as in this case, for example, the surface of the back of the film carrier. On the other hand, especially if the projection elements represent the mountains, the amplitude of the structure on the surface of the back of the film carrier can be chosen to be significantly lower than the height of the projection elements themselves, which in particular facilitates further processing of the corresponding hook tape material if For example, this is to be separated from the semi-finished product and applied to surfaces.

In particular, the peaks can be narrower than the valleys, which also applies if the projection elements designed as peaks are narrower than the valleys. In this way, the respective peaks can reach better and deeper into the associated valleys - and in particular with more play. In this way, alignment and associated stabilization or form-fitting can already be ensured in a reliable manner.

As already indicated above, at least some of the projection elements, preferably all of the projection elements, can comprise a component having projections parallel to the film carrier. These projections are preferably arranged with their component having parallel to the film carrier at the end of the projection elements which face away from the film carrier. In particular, this component can then also have a structured surface on its surface facing away from the film carrier, in particular also a periodically structured surface, which can then be used as explained above.

These projections can in particular be designed as jumps, as far as their interlocking ability is concerned, in particular perpendicular to the plane spanned by the machine direction and the transverse direction or width of the film carrier is concerned.

In particular, the projection elements can be hook-shaped, which is already well known from the prior art.

It is understood that the features of the solutions described above or in the claims can also be combined if necessary in order to be able to implement the advantages cumulatively.

Figur 1

ein erster Formschluss zwischen Vorsprungelementen und der Oberfläche der Rückseite des Filmträgers in schematischer Ansicht;

Figur 2

ein zweiter Formschluss zwischen der Oberfläche der Vorsprungelemente und der Oberfläche der Rückseite des Filmträgers in schematischer Ansicht;

Figur 3

eine erste detaillierte Darstellung der Oberfläche der Rückseite des Filmträgers und eines Vorsprungelements mit gleicher Periodizität;

Figur 4

eine zweite detaillierte Darstellung der Oberfläche der Rückseite des Filmträgers und eines Vorsprungelements mit breiteren Tälern als Berge;

Figur 5

eine perspektivische Darstellung eines ersten Hakenbandmaterials mit einer Rillenstruktur auf den Oberflächen der Vorsprungelemente und der Rückseite des Filmträgers;

Figur 6

eine perspektivische Darstellung eines zweiten Hakenbandmaterials mit einer Noppenstruktur auf den Oberflächen der Vorsprungelemente und einer Rillenstruktur auf der Rückseite des Filmträgers;

Figur 7

eine Hakenbandmaterialrolle aus einem Hakenbandmaterial; und

Figur 8

eine Hakenbandmaterialspule aus einem Hakenbandmaterial.

Further advantages, objectives and properties of the present invention are explained in the following description of embodiments, which are also shown in particular in the attached drawing. In the drawing:

Figure 1

a first form fit between projection elements and the surface of the back of the film carrier in a schematic view;

Figure 2

a second form fit between the surface of the projection elements and the surface of the back of the film carrier in a schematic view;

Figure 3

a first detailed representation of the surface of the back of the film carrier and a projection element with the same periodicity;

Figure 4

a second detailed representation of the surface of the back of the film carrier and a projection element with wider valleys than mountains;

Figure 5

a perspective view of a first hook tape material having a groove structure on the surfaces of the projection elements and the back of the film carrier;

Figure 6

a perspective view of a second hook tape material with a dimple structure on the surfaces of the projection elements and a groove structure on the back of the film carrier;

Figure 7

a hook tape material roll made of a hook tape material; and

Figure 8

a hook tape material spool made of a hook tape material.

The hook tape material 10 shown in the figures can, as in particular Figures 7 and 8 are wound into hook tape material rolls 100 or hook tape material spools 110.

In this case, the winding takes place along a machine direction 11, which regularly also represents the longest extension of the hook tape material 10, since this is to serve as a semi-finished product for further processing and thus should be provided in the greatest possible lengths.

The hook tape material 10 essentially comprises a film carrier 20 which accordingly extends along the machine direction 11 and is sufficiently flexible to be provided at least within the hook tape material roll 100 or the hook tape material spool 110.

The film carrier 20 has a front side 24 and a back side 25, which extend accordingly along the machine direction 11 and perpendicular thereto over a width 26 of the film carrier 20, also referred to as the transverse direction.

The width 26 of the film carrier 20, i.e. also the transverse direction, is aligned perpendicular to the machine direction 11.

On the front side 24 of the film carrier 20, projection elements 30 are arranged, which ultimately represent the hooks of the hook tape material 10.

Depending on the specific design, the projection elements 30 can have projections or even jumps in order to strengthen their hooking properties. Such jumps are shown for example in Figures 1, 2 , 5 and 6 shown without numbers, since such things are sufficiently known from the prior art. It is understood that in alternative embodiments, the projection elements 30 can also be formed into real hooks or merely into stems.

As can be seen directly from the Figures 7 and 8 understandably, in the case of the hook tape material rolls 100 or hook tape material spools 110, a surface 31 of the projection elements 30, which faces away from the film carrier 20, comes to rest on a surface 21 of the rear side 25 of the film carrier 20.

The projection elements 30 are spaced apart from one another by gaps 38 so that the former can fulfil their interlocking function in a manner known per se.

For example, in the surface 21 of the back 25 of the film carrier 20, mountains 22 and valleys 23 can be provided, the periodicity of which corresponds to the periodicity of the projection elements 30, which can then serve as mountains 34, as in Figure 1 presented as an example.

When wound in the form of a hook tape material roll 100 or hook tape material spool 110, the latter can, particularly if the valleys 23 are wider than the heads of the projection elements 30, engage in the valleys 23 of the surface 21 of the back 25 of the film carrier 20 and in this way form a positive connection which acts at least along the width 26 of the film carrier 20. Accordingly, the respective layers then stabilize each other so that the valleys 23 of the surface 21 of the back 25 of the film carrier 20 act as a means 14 for increasing the static friction.

In this case, the valleys 23 of the surface 21 of the rear side 25 of the film carrier 20 can in particular be designed in the form of grooves, so that any displacements along the machine direction 11 play no or only an insignificant role.

In alternative embodiments, as described in Figures 2 to 6 As shown, the surfaces 31 of the projection elements 30, i.e. the surfaces 31 of the projection elements 30 facing away from the film carrier 20, can each be provided with a structure, i.e. in particular with peaks 32 and valleys 33, wherein the surface 21 of the rear side 25 of the film carrier 20 can then have corresponding peaks 22 or valleys 23.

This also makes it possible to align the projection elements 30 with respect to the peaks 22 and valleys 23 of the surface 21, which can have a corresponding stabilizing effect on the hook tape material roll 100 or hook tape material spool 110.

With a suitable coordination, in particular a positive connection can also be formed, in particular perpendicular to the machine direction 11 or along the width 26 of the film carrier 20, which has a corresponding stabilizing effect, so that the structure provided by the peaks 22 and valleys 23 of the surface 21 of the rear side 25 of the film carrier 20 can be regarded as a means 40 for increasing the static friction.

The structure on the surface 21 of the back 25 of the film carrier 20 on the one hand and the structure by the mountains 32 and ridges 33 of the surface 31 of the projection element 30 or the structure formed by the projection elements 30 as mountains 34 on the other hand can each be assigned a height 27, 37 which is oriented perpendicular to the plane spanned by the machine direction 11 and the width 26 or transverse direction or perpendicular to the surfaces 21, 31.

As in the Figures 3 and 4 For example, heights 27 and 37 can be essentially the same.

As can be seen from the example shown in Figure 1 It is clear that the height 27 of the valleys 23 of the surface 21 of the rear side 25 of the film carrier 20 can also be significantly lower than the height 37 of the peaks 34 formed by the projection elements 30. In particular, when the peaks 32 and valleys 33 are provided on the surface 31 of the projection elements 30, it is also conceivable to make the height 37 of the peaks 32 and valleys 33 of the surface 31 of the projection element 30 lower or significantly lower than the height 27 of the peaks 22 and valleys 23 on the surface 21 of the rear side 25 of the film carrier 20.

Preferably, the periodicity of the peaks 22 and valleys 23 on the one hand and the peaks 32 and valleys 33 on the other hand approximately corresponds to each other, as in the embodiments according to Figures 1-6 can be seen. On the other hand, deviations can also be provided so that the respective peaks 22, 32, 34 only engage in every second valley 23, 33 or vice versa or in higher integer multiples. This can also ensure sufficient stabilization of the layers of the hook tape material rolls 100 or hook tape material spools 110.

As in particular in Figure 4 As shown by way of example, the respective peaks 22, 32 can be designed to be significantly narrower than the valleys 23, 33. This allows for lateral play, so that the layers can also be arranged at an angle to one another or corresponding deviations are possible.

It is understood that the differences in width between peaks 22, 32, 34 and valleys 23, 33 do not necessarily have to be symmetrical on both surfaces 21, 31 or on the projection elements 30.

The peaks 22, 32 and valleys 23, 33 can each be formed as grooves, as shown in the Figures 2 to 5 is indicated as an example.

It is also conceivable how Figure 6 suggests that the mountains 22, 32 are designed like islands or as knobs, whereby preferably corresponding counterparts can be provided in the valleys 23, 33.

Preferably, however, only the peaks 22, 32 or valleys 23, 33 of one of the two surfaces 21, 31 are designed to be island-like or knob-like, while the corresponding counterparts of the other surface 21, 31 are then designed to be groove-like, so that deviations along the machine direction 11 appear insignificant or less significant. In this way, different winding radii and different tape tensions of the hook tape material 10 within the hook tape material roll 100 or the hook tape material spool 110 do not play such a decisive role.

List of reference symbols:

10

Hook tape material

11

Machine direction

20

Film carrier

21

Surface of the back 25 of the film carrier 20

22

Mountain of the Surface 21

23

Valley of the Surface 21

24

Front of the film carrier 20

25

Back of the film carrier 20

26

Width of film carrier 20

27

Height

30

Projection element

31

Surface of the projection element 30

32

Mountain of the Surface 31

33

Valley of the Surface 31

34

mountain formed by projection element 30

37

Height

38

Space

40

Friction enhancing agents

100

Hook tape material roll

110

Hook tape material spool

Claims (15)

Hook tape material (10) made of a hardened plastic with a flexible film carrier (20) comprising a front side (24) and a back side (25), wherein spaced apart separate projection elements (30) are arranged on the front side (24) of the film carrier (20), characterized in that (i) static friction increasing means (40) provided by a structured surface (21) increasing the static friction are arranged on the back side (25) of the film carrier (20); and/or (ii) the rear side (25) of the film carrier (20) has a structured surface (21) and the surface (21) of the rear side (25) of the film carrier (20), on the one hand, and the projection elements (30) and/or a structured surface (31) of the projection elements (30), on the other hand, form a positive connection parallel to the film carrier (20); and/or (iii) the back side (25) of the film carrier (20) has a periodically structured surface (21), wherein the projection elements (30) have a periodically structured surface (31) and the periodicity of the surface (21) of the back side (25) of the film carrier (20) and the periodicity of the surfaces (31) of the projection elements (30) are coordinated with one another and/or wherein the projection elements (30) form periodically arranged projections, the surface (21) of the rear side (25) forms recesses, the periodicity of the projections and the periodicity of the recesses are coordinated with one another and the recesses in the surface (21) are formed wider than the projections. Hook tape material (10) according to claim 1, characterized in that the surface (21, 31) has a groove structure, wherein the groove structure preferably comprises peaks (22, 32) and valleys (23, 33) arranged parallel to one another. Hook tape material (10) according to claim 1, characterized in that the projection elements (30) themselves form mountains (34). Hook tape material (10) according to claim 2 or 3, characterized in that the peaks (22) and/or valleys (23) extend over the entire width (26) of the film carrier (20). Hook tape material (10) according to one of claims 2 to 4, characterized in that the peaks (22, 32) and valleys (23, 33) are arranged parallel to a machine direction (11). Hook tape material (10) according to one of claims 2 to 5, characterized in that the peaks (22) of the surface (21) of the back side (25) of the film carrier (20) engage in the valleys (33) of the surface (31) of the projection elements (30) and/or in the gaps (38) between the projection elements (30) and/or that the projection elements (30) and/or the peaks (32) of the surface (31) of the projection elements (30) engage in the valleys (23) of the surface (21) of the back side (25) of the film carrier (20). Hook tape material (10) according to one of claims 2 to 6, characterized in that a height (27, 37) between the peak (22, 32) and its adjacent valley (23, 33) of a first of the two surfaces (21, 31) is greater than a height (27, 37) between the peak (22, 32) and its adjacent valley (23, 33) of the second of the two surfaces (21, 31). Hook tape material (10) according to one of claims 2 to 7, characterized in that the peaks (22, 32) are narrower than the valleys (23, 33) and/or the projection elements (30) designed as peaks (34) are narrower than the valleys (21). Hook tape material (10) according to one of claims 1 to 8, characterized in that the periodicity of the surface (21) of the back side (25) of the film carrier (20) and the periodicity of the projection elements (30) and/or the periodicity of the surfaces (31) of the projection elements (30) perpendicular to a machine direction are the same or differ from one another by an integer amount. Hook tape material (10) according to one of claims 1 to 9, characterized in that at least some of the, preferably all, projection elements (30) have a component parallel to the film carrier, preferably overhangs, in particular are hook-shaped. Hook tape material (10) according to one of claims 1 to 10, characterized in that the surface (21) of the back side (25) of the film carrier (20) and the projection elements (30) and/or a structured surface (31) of the projection elements (30) form a positive connection perpendicular to the machine direction (11). Hook tape material (10) according to one of claims 1 to 11, characterized in that the static friction increasing means (40) act mechanically. Hook tape material (10) according to one of claims 1 to 12, characterized in that the static friction increasing means (40) or the structured surface (31) are formed integrally in and/or with the film carrier (20). Hook tape material roll (100) made of a hook tape material (10) according to one of claims 1 to 13, characterized in that the hook tape material (10) is wound up as the hook tape material roll (100). Hook tape material spool (110) made of a hook tape material (10) according to one of claims 1 to 13, characterized in that the hook tape material (10) is wound up as the hook tape material spool (110).

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