WO2012005576A2

WO2012005576A2 - Artificial turf with hook and loop fastening

Info

Publication number: WO2012005576A2
Application number: PCT/NL2011/050482
Authority: WO
Inventors: Arjan Knottnerus
Original assignee: Knottnerus Beheer Bv.
Priority date: 2010-07-05
Filing date: 2011-07-05
Publication date: 2012-01-12
Also published as: WO2012005576A3

Abstract

Artificial turf mat assembled from separate strips artificial turf that can be rolled to a roll, wherein each strip at the lower side is provided with a part of a hook and loop fastening such as a felt, and wherein for one, a number or each strip the part of the hook and loop fastening is applied across substantially the complete surface of the strip while the next to each other laying strips are joined through said hook and loop fastening and the edge of the joined turf strips are joined face to face.

Description

Artificial turf with hook and loop fastening.

This invention relates to a method to install a temporary or permanent, loose laying artificial grass Floor made from separate, unrolled, strips of artificial turf, which can be rolled again, and which are mutually connected by hook and loop fastening such that they provide a single assembly such that one can safely play soccer or a different game or sport or recreation. Besides the invention is also applicable to carpet which as temporary or permanent floor covering is installed in e.g. an office, living room, event stadium or showroom and onto which one walks around.

A not loose laid, temporary artificial turf with hook and loop fastening is supplied under the brand Limonta Portable Artificial Turf System (Limonta system) . Thus system is made from separate shock absorbing sheets measuring 1.22 by 2.44 metre. Onto this rectangular sheet of EVA foam a piece of artificial turf is mounted by a the complete surface of the sheet covering adherent layer. The dimension of the piece of artificial turf is larger then that of the sheet, such that the turf extends four centimetre beyond the sheet at all four sides. The lower side of these cantilevered turf strips is provided with the one part of a hook and loop fastening. There are also coupling strips of the same material as the sheet and with a width of eight centimetre and a length a little longer or shorter then the long or short side of the shee . The coupling strips are at their top side across their complete surface provided with the other part of a hook and loop fastening. By locating the sheets according to a rectangular pattern at a mutual spacing of eight centimetre onto a substrate, such as a concrete floor, the edges of the cantilevered turf strips of the adjacent sheets exactly join. By subsequently folding back of the cantilevered turf strips at the corresponding sheet the eight centimetre wide gap between the sheets becomes accessible from above. Thus a coupling strip can be tightly fitted into said gap, with the one part of the hook and loop fastening at the top. By subsequently folding back of the cantilevered turf strips onto the inserted coupling strip, said turf strips are by the hook and loop fastening mounted to the coupling strip, such that a single assembly is made, with a dimension of e.g. 30 by 15 metre.

In use, this Limonta system is fragile.

The invention proposes an improvement that is less fragile, offers excellent playing properties across the complete surface and can also more easily be assembles and disassembled. The invention is, among others, based on the surprising teaching that an as playing field for e.g. soccer used artificial turf with an area of at least 25 square metre can also for temporary use be loose laid onto a coherent, rather smooth substrate, e.g. foam sheets, pedestrian tiles, asphalt terrain, without fear for sliding, such that, different from the present believe of the skilled person, compared to a completely adhered artificial turf there is no increased risk for injury.

Thus the artificial turf is on site assembled from separate, preferably rectangular (elongate or square) strips of turf that (can) be rolled to a roll and wherein at least one or each turf strip at the lower side across substantially the complete surface is provided with the one or other part of a hook and loop fastening (the part with the plurality and with tight spacing located hooks or the part with the plurality and with tight spacing located loops, such a felt) such that the adjacent edges of two next to each other positioned strips make a hook and loop connection through the hook and loop fastening, possibly with the intermediate aid of a separate connection strip provided with the one and/or other part of a hook and loop fastening, while the edges of the strips mutually join through a butt joint or facing joint or minimal or no lap joint or tight or no gap.

By providing a turf strip across the complete surface at the lower side with the one part of the hook and loop fastening, one can without trouble during assembly, thus on site, remove a piece of the strip, e.g. to trim the turf strip in the length or width, while maintaining the possibility to mutually connect the strips by hook and loop fastening, as if it was a virgin strip. The part of the hook and loop fastening can be mounted to the strip within the factory, thus under ideal circumstances. Durability and simplicity of installation of an artificial turf are improved in this manner .

The part of the hook and loop fastening can within the factory, thus under ideal circumstances, be mounted to the strip. By providing the turf strip across substantially the complete surface with the part of the hook and loop fastening, an extensive optimisation of the production can be obtained. During production in the usual manner of the turf strip in roll, e.g. 4 metre wide, the part of the hook and loop fastening, e.g. a felt layer, be applied by e.g. calendaring or in a different manner laminating onto the strip coming from the production machine, after which the turf strip is rolled up. Since the turf strip and the felt strip are substantially of equal width, the laminating process can be properly controlled.

During on site assembly the strips are typically supplied as rolls and on site unrolled onto the substrate. After the strips are mutually fastened, the turf is typically pulled tight by pulling at the outer edges, to smoothen pleads.

Thus the temporary or permanent playing field can be assembled from two or more by hook and loop fastening with the edges mutually fastening turf strips.

It is preferred, if all mutually fastened strips of the turf are at the lower side across substantially the complete surface provided with a part of the hook and loop fastening, preferably all strips with the same part of the hook and loop fastening. Alternatively this is not required for each strip, e.g. it is feasible if most strips (in the factory or on site) are merely along the edges provided with a part of the hook and loop fastening, e.g. when one has planned to avoid trimming said strips, and then provide one or a number across the complete or substan ially complete surface with a part of the hook and loop fastening, which strips are designed for trimming, thus be regarded as some kind of adaption strips.

It is further preferred if with all strips the part of the hook and loop fastening does not extend outside the strip. In that case a separate mounting strip with the other part of the hook and loop fastening is required, which fastening strip overlaps both joining edges and is hooked to it. Alternatively the part of the hook and loop fastening could extend beyond the strip, e.g. of a turf strip the lower side could be provided with a part of the hook and loop fastening which covers substantially the complete surface of the strip and also projects outside the strip along e.g. one edge, such that by placing two strips next to each other the edge of the one strip will bear onto the projecting part of the hook and loop fastening at the adjacent strip. In such a case a separate fastening strip is superfluous.

In most cases it is preferred to releasable fasten the edges of the joining strips by an overlapping joint.

In case of a permanent playing field, particularly in the open air, the invention is, among others, based on the teaching that, different from what one expects, a field installed by using hook and loop fastening, is at least as good and durable as a with traditional assembly with glue installed field. The permanent, however for hook and loop fastening characteristic damage free releasable and subsequently again to be obtained fastening offers a further advantage since from the finished playing field a turf strip at a later time can easily be replaced, e.g. to remove a local damage.

With the invention one or more of the following can be obtained: the strips join more neat, which improves the smoothness of the playing field; the field can be installed and removed in less timed; less parts are required; it is easier to handle and store the parts; installation of an outdoor field is no longer dependent from the weather conditions, the durability of the joint seam is improved.

The inventor has further invented to replace the typical glued joint between turf strips of a traditional, loose laid artificial turf, by a hook and loop fastening.

'Loose laid' means that the mat with at least the largest part of its area lays loose on the ground and thus is not adhered to it, such as with the Limonta system, or in a different manner is fastened to the ground over a large area. Preferably the turf is fastened to the ground along its edges to avoid sliding and to remain free from pleads during use. Preferably, the turf is stretched.

An alternative object of this invention is to provide a method to by hook and loop fastening joining next to each other laid strips which, while a high quality, durable and indeed releasable fastening, can be carried out within the shortest possible time against the least human effort.

Thus alternatively according to the invention the turf is on site assembled from separate, preferably rectangular (elongate or square) strips of artificial turf which each rolled to a roll or folded into a package are supplied and on site are spread out and wherein each strip at the lower side along the to another strip to be fastened edges or across

substantially the complete surface is provided with the one or other part of a hook and loop fastening (the part with the plurality of closely spaced hooks or the part with the plurality closely spaced loops, such as felt) such that the joining edges of two adjacent strips make through the parts of the hook and loop fastening a hook and loop fastening under the intermediary of a separate fastening strip which is provided with the one and/or other part of a hook and loop fastening, while the strips are spread such that the edges of the joining strips make a a butt joint or facing joint or minimal or no lap joint or tight or no gap.

According to the invention one or more of the following operations are carried out:

two turf strips with at the lower side permanently mounted hook and loop fastening material are substantially in the final position laid next to each other by spreading onto and sliding across the ground;

the separate fastening strip of hook and loop fastening material is first by hook and loop fastening finally fastened to the one of two to be joined turf strips, wherein a local operative pressure force moves along the length of the turf strip and brings the separate fastening strip gradually towards the turf strip and forces it onto the hook and loop fastening material of it to be fastened by hooking, such that the part of the fastening strip downstream from the pressure force is finally hooked to the turf strip and the part of the fastening strip upstream from the pressure force is free from the turf strip and preferably is remotely located. Preferably at the part of the fastening strip upstream from the pressure force one pulls, such that this part is kept pulled tight. Preferably the edge of the turf strip to which the fastening strip is hooked is folded back, preferably for the complete length, such that the hook and loop fastening material at this edge of the turf strip faces upward;

the to the one turf strip hooked, separate fastening strip extends with a projecting edge strip beyond the one of the two to be joined turf strips, to be present with said edge strip below the other turf strip and be hooked to it, wherein said edge strip preferably approximately covers the half width of the fastening strip;

the edge of the one turf strip with fastened to it the fastening strip and also the edge of the other turf strip are in the desired final position laid next to each other, preferably by from the temporary folded back position returning of the edge of the one turf strip, wherein preferably the one and/or other turf strip substantially remains in place, wherein one takes care that the fastening strip from the lower side of the one turf strip through the gap between the turf strips extends upward and projects with the projecting edge strip above the turf strips;

the edge of the other turf strip is in a local area, moving along the edge, temporary lifted to make the hook and loop fastening with the fastening strip. With that preferably one or more of the following is applicable: a lifting force moves along the turf strip; the above the turf strip projecting free part of the fastening strip is by a pressure force pushed below the other turf strip in the lifted area, to obtain a position spread onto the ground; spreading of the with the other turf strip to be hooked part of the fastening strip takes place in a substantially coinciding with the lifted area of the other turf strip along the turf strip advancing local area; downstream from this local, advancing area the fastening strip is completely spread onto the ground and both turf strips bear onto it, while upstream from this local area the fastening strip projects to above the turf strips;

- the above the turf strips projecting edge strip of the fastening strip is in the area in which the other turf strip is temporary lifted, brought below the other turf strip to spread there below;

the edge of the other turf strip is folded back along the complete length to offer the projecting edge strip of the fastening strip space to spread across the ground, after which the edge of the other turf strip is returned along the complete length;

after the projecting edge strip of the fastening strip is spread across the ground, the edge of the other turf strip is pressed onto it such that the desired permanent hook and loop fastening is obtained;

onto the separate fastening strip a separate release strip is applied, removal of which is required to obtain the desired permanent hook and loop fastening . Preferably for this release strip one or more of the following applies: covers at least the projecting edge strip of the fastening strip, completely or substantially completely; covers the projecting edge strip of the fastening strip such that this projecting edge strip remains substantially free from a hook and loop fastening with the edge of the relevant {other) turf strip; projects from below the turf strip through the gap between the turf strips to above the turf strip; is removed after both turf strips and the separate fastening strip are positioned in the final, across the ground spread, position, e.g. by pulling it lengthwise or crosswise; is with a longitudinal edge temporary clamped below a turf strip, e.g. outside the area which overlaps with the fastening strip.

The temporary or permanent playing field is assembled from two or more by hook and loop fastening with the edges to be joined strips of artificial turf. It will be appreciated that preferably of all turf strips the part of the hook and loop fastening does not extend beyond the turf strip, differently spoken, remains within the boarders defined by the dimension of the turf strip. In that case a separate fastening strip (or mounting strip) with the other part of the hook and loop fastening is required, which fastening strip overlaps both to be joined edges and is hooked to them to obtain the permanent, however for hook and loop fastening characteristic easily damage free releasable and subsequently again obtainable fastening. Alternatively the part of the hook and loop fastening could extend beyond the strip, e.g. of a turf strip the lower side could be provided with a part of the hook and loop fastening which substantially covers the complete area of the strip and also projects beyond the strip along e.g. one edge, such that by laying two strips next to each other, the edge of the one strip will bear onto the projecting part of the part of the hook and loop fastening of the adjacent strip. In such a case a separate fastening strip would be superfluous.

Preferably not to the invention belongs the Group of embodiments wherein the to the lower side of the turf strip mounted part of the hook and loop fastening extends to outside the turf strip, e.g. of a turf strip the lower side is provided with a part of the hook and loop fastening which substantially covers the complete area of the strip and also projects outside the strip along e.g. a single edge, such that by laying two strips next to each other the edge of the one turf strip will bear onto the projecting part of the part of the hook and loop fastening at the adjacent turf strip. In such a case a separate fastening strip would be superfluous.

It will be appreciated that the edges of the to be joined turf strips are preferably by an overlap joint releasable joined. It will also be appreciated that, also for a permanent playing field, particularly outdoor, the hook and loop fastening replaces the traditional glued assembly.

One can assemble the field from merely next to each other laid strips and also from next and in mutual extension laid strips and possibly crosswise extending strips. When assembling a field from both next to each other and in mutual extension and/or crosswise extending strips, the length of the strips can be limited such that the weight of a roll can be limited.

Preferably all turf and fastening strips can be rolled into a roll .

The pile of the turf is e.g. made from a mixture of straight and curled fibrillated and/or monofilament fibres projecting from the basic ma .

The turf can be applied with or without infill {granular, pourable material of e.g. sand and/or rubber with which on site the turf fibres are filled in to be substantially embedded in it) and preferably directly spread onto a levelled, shock absorbing, incompressible subsurface which is e.g. also temporary and thus e.g. assembled from inflexible sheets of foam.

E.g. the subsurface is provided by a plural ity of according to a rectangular pattern next to and in extension placed sheets which with their longitudinal and lateral edges are closely spaced and are releasable joined, e.g. by mating shape of the edges, as with jig saw puzzles, and loose onto a substrate, e.g. concrete sub floor. Or the sub surface is a loose poured foundation. The turf is spread loose onto the subsurface, thus can always slide relative to the ground and immediately lifted from the ground .

The turf is made from a mat from which synthetic fibres project upward, thus imaging a carpet with high pile, and between these fibres there is preferably granular filler (infill) to keep the fibres substantially upright and to offer the field resilience. For an artificial turf the ends of the fibres project slightly above the infill, such that the exposed fibre ends mimic the appearance and playing properties of a natural turf .

The mat is e.g. woven from synthetic fibres and into it are parallel rows of synthetic fibres or straps tufted in a rate of e.g. 3/16 or 3/8^».

When the invention is applied to a permanent playing field outdoor for e.g. official games, the only required change compared to a typical field, like soccer, hockey or tennis, that the strips are joined by the hook and loop fastening in stead of a glued fastening. The sub surface onto which the artificial mat is laid will as a rule not differ from what is typical nowadays, wherein said ground has e.g. a sport technical layer, is draining and possibly has drainage tubes.

With the nowadays typical permanent fields, 4 metre wide turf strips are located next to each other and with on site with 2 -component glue impregnated 30 centimetre wide fastening strips (so called glue carrier) the adjacent edges of the turf strips are permanently joined. The fastening method is replaced by the hook and loop fastening. The hook and loop fastening parts are applied at properly controlled conditions inside the factory. And years later the turf can be disassembled into the original strips by disconnecting the hook and loop fastening parts .

Also for do it yourself the invention offers advantages while installing an artificial turf in the garden.

Adding to the above this invention can thus relate to a play or sport field with a top layer of artificial turf, e.g. for soccer, tennis, athletics or hockey or different outdoor sport. The field has an indeed or not water permeable top layer, such as an artificial mat, of e.g. plastic/polymer material. The field is e.g. founded onto an on site poured package bound or unbound granules material, wherein said package is preferably frost damage free and/or water permeable . The granules material can be stone like or a mixture of stone like granules and granules of different type.

In particular the invention can relate to a permanent installed playing field, i.e. only after one or more years, as a rule after 10 or 15 years or longer, it is removed.

For the play or sport field use could have been made of a so called pressure spreading fabric onto which the top layer is directly or indirectly placed. The pressure spreading fabric is a bound or partly bound layer of artificial fibres that are assembled into a mat. The pressure spreading fabric is sufficient smooth, such that during installing the top layer can easily slide over it while the pressure spreading fabric and the material there below, stays in place without sliding. This is important to be able to sufficiently stretch the top layer during installation to provide a bump free field. E.g. the pressure spreading fabric fixates the as a rule immediately there below provided so called sport technical layer or different on site poured layer.

Below or above the pressure spreading fabric but below the top layer one or more different fabrics or such woven or nonwoven fibre layers or different fabric or foil like coherent layers can be present , e.g. an e-layer or a foam layer or a heat isolating layer, such as Enkaflex 20 or Enkaspacer 5025 or Enka underlay 10.

For the top layer in combination with which the invention is preferably applied, the following can be said:

The top layer covers e.g. an area of at least 500 or 1000 square metre . The top layer is preferably based on a mat of artificial fibres (e.g. PE and/or PP) , e.g. with a rate 3/8 or 5/16 or 5/32 (8, 16 or 32 stitches at 3 , 5 or 5 inch mat length or width, respectively) . Application for the following rates is feasible: between 3/4 and 3/12; between 5/12 and 5/20; between 5/28 and 5/36. The pile height can measure between 10 and 100mm, such as between 35 and 70mm (e.g. for soccer) or between 20 and 25 mm (e.g. for tennis or hockey) . From the mat, the pile providing artificial fibres project. These are e.g. fibrillated fibres, monofilament fibres or mixtures of it (i.e. a stitch contains both fibre type) . Fibrillated fibres are fabricated by extruding a foil of e.g. polypropylene (PP) and/or polyethylene (PE) , cutting it in small strips and providing each strip with many tiny cuts such that many tiny strips next to each other are obtained of which the adjacent tiny strips at several locations along their length are still joined. Monofilament fibres are separate extruded threads which apart from a flat can also have a round or angular cross sectional shape .

The fibres of the top layer are tufted into the (plain woven) base mat, such that from the base mat projecting loops are made which are subsequently cut open such that grass sprieten are imitated. In stead of tufting the fibre can also be provided into the base mat differently, e.g. knotted.

EXAMPLE

Without limitation, the invention is further disclosed by way of an example of a permanent outdoor playing field:

An artificial turf field is constructed as follows: below are drainage tubes provided. Immediately or at some distance there above is an on site poured, unbound sand package. On top of that there is an on site poured, so called sport technical unbound layer (e.g. a mixture of sand and/or rubber and steagran or lava stone) . On top of that there is a pressure spreading fabric. On top of that there is an artificial turf mat (semi unbound, since infill of loose rubber granules and/or sand is spread into it) . The sport technical layer has good water permeability and provides a levelled and stable substrate for the turf mat . The sand package provides good water drainage and extends sufficient deep to provide a frost damage free structure. Te sand package and/or sport technical layer can be replaced by a different material layer. One or more further material layers can be added. The drainage tubes can be absent or replaced by a different drainage system.

The sport technical layer comprises e.g. an unbound granule mixture stone like material of large and small granules, e.g. having a diameter substantially in the range of 1 millimetre to 20 millimetre. Thus this layer comprises an unbound stable mineral skeleton with load spreading and load bearing capacity wherein the unavoidable space between larger granules is filled by smaller and even smaller granules while the drainage is maintained. Rubber granules could have been added. The sand package comprises an unbound granule mixture stone like material of small granules, e.g. with a diameter substantially in the range smaller then 2 or 3 millimetre. Layer thicknesses are preferably as follows: sport technical layer 5 to 10 centimetre; sand package at least 5 or 10 centimetre.

The turf strips are at the lower side across the complete surface provided with the loop part of hook and loop fastening (e.g. felt) . Symmetrical below the seam between two adjacent turf strips there is a fastening strip of 30 centimetre width of the hooking part of the hook and loop fastening, to which the on top of that bearing loop parts at the edges of the turf strips are hooked.

By way of the attached schematic drawing the method of the invention is further elaborated.

Fig. 1 shows a side view;

Fig. 2 shows an end view of different states;

Fig. 3 shows an end view of different states;

Fig. 4 shows a sectional side view.

The in the several figures illustrated parts are shown in exploded view, for illustrative purposes.

Fig. 1 shows a turf strip 1. At the lower side a felt layer 2 is laminated. The turf strip 1 is upside down, such that the felt layer 2 faces upward. The illustration shows the time at which the fastening strip 3, with the hooking parts of the hook and loop fastening, is permanent and damage free releasable, being fastened to the felt layer 2. A locally active pressure force (arrow P) advances (arrow A) along the length of the turf strip. This force P brings the separate fastening strip 3, of which the hooking surface face down, gradually to the turf strip 1 and pushes it onto the felt 2 and hooks both together. The part of the fastening strip downstream (in the drawing to the left) of the pressure force P is finally hooked to the turf strip and the part of the fastening strip 3 upstream from the pressure force P is still released from the turf strip and remote from it. A pulling force (arrow F) acts on the part of the fastening strip 3 downstream from the pressure force P, such that this part is maintained in tight condition. The fastening strip 3 is gradually unrolled from a roll 4 while this process advances .

Fig. 2 shows different states during hooking together of two turf strips 1 and 5. At time 0 the two turf strips are spread across the ground and lay with their edges end to end against each other . Subsequently the edge of turf strip 1 is folded back along the complete length (arrow B) , to arrive at state I. During state I the fastening strip 3 is applied in the manner of fig. 1. As soon as the fastening strip 3 is applied along the complete length of the turf strip 1, the edge of the turf strip 1 is returned along the complete length and state II is obtained. During state II the fastening strip 3 projects along the complete length upward from below the turf strip 1 through the gap 6 between the end to end joining turf strips 1, 5 and projects above the turf strips 1, 5.

By folding back (arrow B) of the edge of the turf strip 5 along the complete length, state III is obtained. The fastening strip 3, hooked to the turf strip 1, can now along the complete length in a single movement completely be spread onto the ground (broken arrow U) . Subsequently the edge of turf strip 5 is returned along the complete length (arrow B) , such that end state IV is obtained. During state IV the separate fastening strip 3 is hooked to the felt 2 of both turf strips 1,5.

Alternative states are feasible, e.g. state IIIA in stead of state III. During state IIIA the edge of turf strip 5 is not folded back. In stead the edge of turf strip 5 is in a local area, advancing along the edge, temporary lifted. In that case a lifting force (arrow F} advances along the turf strip. Fig. 4 shows in the cross section along line Z-Z in fig. 2, state IIIA, how in this local, advancing area (arrow A) the turf strip 5 is lifted by the force F. The above the turf strip projection still released part of the fastening strip 3 can by a pushing force (arrow D in fig. 2, state IIIA) be pushed below the turf strip 5 in the lifted area, to become spread out onto the ground. Thus also spreading of the to the turf strip 5 to be hooked part of the fastening strip 3 is carried out in a substantially coinciding with the lifted area of the turf strip 5 along the turf strip 5 advancing local area. Downstream (to the left in the drawing) of this area the fastening strip 3 is complete spread across the ground and both turf strips 1 , 5 bear onto it (as in state IV) . Upstream from this area fastening strip 3 projects above the turf strips (as in state II) . For this reason in fig. 4 the fastening strip 3 is only visible in the left hand part of the drawing.

Fig. 3 shows the use of a release strip 7. Illustrated are states III*, IV* and IV+ as alternatives to states III and IV in fig. 2. In state III* the release strip 7 is applied such that it will bear on top of turf strip 1, on top of the still loose laying completely spread out part of the fastening strip 3 and with the edge below turf strip 5 to be clamped by turf strip 5 to avoid unintentional shifting or being blown away. During state IV* the release strip 7 is gripped at the above the turf strips projecting edge and is pulled to the side (arrow F) , such that the release strip 7 is completely removed and thus the fastening strip 3 can also engage the felt 2 of the turf strip 5 to obtain the desired hook and loop fastening.

During state IV+, compared to state IV* a substantially more narrow release strip 7 is shown, which only bears on top of the part of the fastening strip 3 which will be hooked to the turf strip 5, and completely remains below the turf strips 1, 5. A further alternative is feasible wherein the release strip 7 is fixedly clamped below the turf strip 5 external from the fastening strip 3 and/or is located with an edge below the turf strip 1 (in which case turf strip 1 is only partly hooked to fastening strip 3) . The release strip 7 is in state IV+ removed by gripping an end and pulling lengthwise.

Claims

1. Artificial turf mat assembled from separate strips artificial turf that can be rolled to a roll, wherein one or more strips at the lower side are provided with a part of a hook and loop fastening such as a felt , and the next to each other laying strips are joined through said hook and loop fastening .

2. Mat according claim 1 and wherein for one, a number or each strip the part of the hook and loop fastening is applied across substantially the complete surface of the strip and/or the edges of the joined turf strips join end to end.

3. Mat according to claim 1 or 2, wherein through a separate fastening strip with the other part of the hook and loop fastening which overlaps with both turf strips and on top of which both turf strips with their part of the hook and loop fastening bear, the strips are joined.

4. To a roll rolled artificial turf strip, which strip is provided at its lower side with a part of a hook and loop fastening, which part is preferably provided across

substantially the complete surface of the strip.

5. Method to on site joining with hook and loop fastening of onto the ground spread and adjacent, rectangular strips artificial turf of a loose onto the ground to be assembled, a single assembly providing artificial turf mat with a pile of upward from a base mat projecting artificial fibres, making use of a separate fastening strip (3) of hook and loop fastening material, wherein the artificial turf strips at the lower side along the to the other turf strip to be joined edges (turf strip with hooking edge) or across substantially the complete surface (turf strip with hooking backing) are provided, by laminating, with the one or other part of a hook and loop fastening, such that for all turf strips the adjoining edges of two without overlap next to each other spread turf strips through the parts of the hook and loop fastening mutually join by hook and loop fastening through an overlap joint, by using the separate, on a roll supplied, fastening strip which is provided with the one and/or other part of a hook and loop fastening and joins by hook and loop fastening the hooking edge or hooking backing of both turf strips by overlapping both by approximately equal width, while the turf strips are spread such that the edges of the adjacent turf strips join end to end, thus without overlap and in said state are finally joined by the hook and loop fastening,

and years later the turf mat is disassembled into the original strips by damage free releasing and removing of the fastening strips by cancelling the hook and loop fastening

6. Method according to claim 5, wherein the following operations are carried out in the indicated sequence:

one provides that the edge of the turf strip (1) to which the fastening strip is first hooked, has been folded back, along the complete length, such that the hook and loop fastening material at this edge of the turf strip faces upward;

the separate fastening strip (3) of hook and loop fastening material is along approximately its half width and along its complete length first by hook and loop fastening finally fastened to the one (1) of the two to be joined turf strips, wherein a local active pressure force (P) advances along the length of the turf strip and the separate fastening strip gradually to the turf strip (1) brings and onto the hook and loop fastening material of it pushes and hooking fastens, such that the part of the fastening strip downstream from the pressure force is finally hooking fastened and the part of the fastening strip upstream from the pressure force is still released from the turf strip and is remote from it while one pulls at the part of the fastening strip upstream from the pressure force with a pulling force (F) , such that this part is kept tight, and the fastening strip (3) projects over approximately its half width beyond the relevant turf strip (1) ;

the edge of the one turf strip (1) with at it the fastening strip (3) is by folding returned to the final position, such that the fastening strip from the lower side of the one turf strip through the gap between the turf strips extends upward and projects with the projecting edge strip above the turf strips (fig. 2, state II);

the edge of the other turf strip (5) is in a local area, advancing along the edge, temporary being lifted to make the hooking fastening with the fastening strip {fig. 4) , for which a local lifting force (F) advances along the turf strip and the above the turf strip projecting free part of the fastening strip is locally by a pushing force (D) being pushed below the other turf strip (5) in the lifted area, to become spread out onto the ground wherein the spreading out of the with the other turf strip (5) to be hooked part of the fastening strip takes place in a substantially coinciding with the lifted area of the other turf strip (5) along the turf strips (1, 5) advancing local area such that downstream from this local, advancing area the fastening strip is completely spread over the ground and both turf strips bear on top of it (fig. 2, state IV) , while upstream from this local area the fastening strip projects to above the turf strips (1, 5) ;

- subsequently to the projecting edge strip of the fastening strip being spread over the ground, the edge of the other turf strip (5) is pushed onto that such that the desired permanent hook and loop fastening is obtained.