WO1998023817A1 - Combined turf - Google Patents

Combined turf Download PDF

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Publication number
WO1998023817A1
WO1998023817A1 PCT/NL1997/000659 NL9700659W WO9823817A1 WO 1998023817 A1 WO1998023817 A1 WO 1998023817A1 NL 9700659 W NL9700659 W NL 9700659W WO 9823817 A1 WO9823817 A1 WO 9823817A1
Authority
WO
WIPO (PCT)
Prior art keywords
base layer
grass
growth substrate
layer
fabric
Prior art date
Application number
PCT/NL1997/000659
Other languages
French (fr)
Inventor
Hugo De Vries
Original Assignee
Hugo De Vries
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE69705535T priority Critical patent/DE69705535T2/en
Priority to CA002285639A priority patent/CA2285639C/en
Priority to JP52457398A priority patent/JP3359041B2/en
Priority to DK97948006T priority patent/DK0941387T3/en
Priority to AU54166/98A priority patent/AU730960B2/en
Priority to EP97948006A priority patent/EP0941387B1/en
Application filed by Hugo De Vries filed Critical Hugo De Vries
Priority to AT97948006T priority patent/ATE202814T1/en
Publication of WO1998023817A1 publication Critical patent/WO1998023817A1/en
Priority to US09/320,776 priority patent/US6242062B1/en
Priority to NO19992606A priority patent/NO313246B1/en
Priority to US09/767,519 priority patent/US6372310B2/en
Priority to GR20010401640T priority patent/GR3036779T3/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • E01C13/08—Surfaces simulating grass ; Grass-grown sports grounds
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • E01C13/08—Surfaces simulating grass ; Grass-grown sports grounds
    • E01C13/083—Construction of grass-grown sports grounds; Drainage, irrigation or heating arrangements therefor
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/20—Industrial for civil engineering, e.g. geotextiles
    • D10B2505/202—Artificial grass
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • E01C13/08—Surfaces simulating grass ; Grass-grown sports grounds
    • E01C2013/086—Combination of synthetic and natural grass
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/23907—Pile or nap type surface or component
    • Y10T428/23979—Particular backing structure or composition

Definitions

  • the present invention relates to a base layer for a combined synthetic and natural turf, comprising: a fabric formed by a plurality of mutually substantially parallel warp threads and a plurality of mutually substantially parallel weft threads intersecting the warp threads, said fabric comprising a plurality of apertures, and a plurality of synthetic grass fibres connected at least partially to the fabric, at least one of the ends of each fibre protruding outside the fabric and forming a synthetic grass blade.
  • a base layer is known, for instance from WO-A-9400639.
  • Natural turf has the advantage that it is relatively soft and wounds and injuries are thereby seldom caused during falls, sliding tackles and the like.
  • the great drawback of natural turf however is that it can deteriorate significantly in quality due to intensive use and/or weather conditions. What remains is a badly damaged field with large, bare (sand) surfaces which cannot be played on, or only with difficulty, and which have an unattractive appearance.
  • Synthetic grass surfaces have therefore already existed for a number of years, in particular for hockey, tennis and the like. Synthetic grass surfaces require less maintenance and withstand a more intensive use than natural turfs. However, the drawback of synthetic turf is that the frictional resistance is so high that wounds and/or injuries can be caused in the case of sliding tackles and undesired falls.
  • This combination turf is formed by a conventional synthetic grass surface constituting a base layer on which a layer of growth substrate is strewn. Grass seed is sown into this growth substrate, so that the crowns of the grass ly between the synthetic grass fibres and are protected thereby.
  • the synthetic grass is formed by a backing and a great number of upright synthetic grass fibres connected therewith. The synthetic grass fibres are regularly spaced, and may be connected to the backing by tufting or weaving. The backing is perforated, so as to allow water and roots of the natural grass to pass therethrough.
  • a coarse woven material is for instance proposed, wherein apertures are formed between the warp and weft threads . It is further proposed to construct the backing from two layers, an apertured top layer carrying the synthetic fibres and a bottom layer stabilizing the top layer with the fibres and preventing the fibres from becoming unstuck during handling of the synthetic grass.
  • the bottom layer may be made from a biodegradable material, so that this will gradually disappear after the turf has been laid, leaving only the perforated top layer with the synthetic grass fibres.
  • This is achieved according to the invention by making use for the combined synthetic and natural turf of a base layer as described above, in which the fibre ends forming the synthetic grass blades protrude from the fabric at location where the weft threads and the warp threads intersect.
  • a base layer is obtained in which there is relatively much room for arranging natural grass.
  • the synthetic grass fibres protrude from the fabric at the intersections of warp and weft threads, the loads are transmitted to the base layer at those locations where this is strongest. It is preferable to have the synthetic grass fibres woven into the fabric, whereby a very strong connection is formed.
  • the apertures in the base layer may be formed immediately during manufacture thereof by enlarged spaces between adjacent warp and/or weft threads, but it is also possible to form the apertures only during use of the base layer by decomposition of warp and/or weft threads made from a biodegradable material .
  • the above described base layer may be arranged between two layers of growth substrate, with grass being sown in the top layer. Due to the apertures, which are present from the start or are created in the course of time by decay or decomposition of the biodegradable threads, the roots of the natural grass plants have the opportunity to grow through the base layer and to become anchored in the bottom layer of growth substrate and possibly also at least partially in the base layer. Optimal rooting hereby becomes possible while the additional strength of the remaining fabric threads and synthetic grass blades is still retained. Alternatively, it is also possible to suffice with one layer of growth substrate which is arranged on the base layer placed on a foundation. The roots can then become anchored in the layer of growth substrate, the foundation and/or the base layer.
  • the base layer according to the invention preferably has a grid pattern.
  • the base layer consists of a fabric of a plurality of series of non-degradable weft threads and a plurality of series of biodegradable weft threads alternating with these series, as well as a plurality of series of non-degradable warp threads intersecting the weft threads and a plurality of series of biodegradable warp threads alternating with these series, and the ends of the synthetic grass fibres protrude from the fabric at locations where the series of non-degradable weft threads and non-degradable warp threads intersect. Relatively robust pieces of fabric thus remain at the intersections of the non-degradable weft and warp threads.
  • biodegradable material is for instance jute, coconut fibre, sisal or biodegradable polymers.
  • biodegradable threads such as jute and the like have the advantage that they retain moisture well. This is of particular importance, certainly in the initial stages of the development of the turf. Both the biodegradable threads and the non- degradable threads can optionally be impregnated or coated with fertilizers.
  • the artificial grass fibres are monofilament fibres.
  • such monofilament fibres look more like grass blades.
  • fibrillated yarns or combinations of different types of yarn can also be used in the base layer according to the present invention.
  • Synthetic grass fibres are of course usually green. It is however possible according to the present invention for at least a part of the synthetic grass fibres to have at least one colour other than green.
  • a pattern such as the lines of a playing field or a club logo, can hereby be formed in the synthetic grass part of the combined turf.
  • An advertizing message can also be envisaged here. Fibres with a colour other than green will become particularly clear when the playing field is damaged. Coloured fibres can optionally be used at the location of the pattern which are the same length as the natural grass and planted more densely in the foundation. The pattern is thus also visible when the natural grass is intact. Repeated application of new chalk lines for playing field lines in particular is thus avoided.
  • At least part of the fabric of the base layer is impregnated or coated with fertilizers.
  • non- degradable threads could be melting threads.
  • these melting threads can be heated, whereby they fuse together at the intersections of weft and warp threads.
  • the length of the synthetic grass fibres can be chosen as desired and depends for instance on the distance over which the fibre is co-woven with the fabric and on the thickness of the layer of growth substrate arranged on the base layer as well as on the desired length of the protruding synthetic grass blades.
  • Synthetic grass fibres are per se known. Synthetic grass fibres are made for instance from polyolefins, polyamides or fibres of natural or non- natural material. The materials used are preferably resistant to wear under mechanical load and to UV radiation. Synthetic grass fibres are obtainable for instance under the brand names ThiolonTM, TrofilTM etc.
  • the invention also relates to a combined synthetic and natural turf comprising a foundation, a base layer as described above arranged thereon and a layer of growth substrate in which grass plants grow arranged on the base layer. The thickness of the layer of growth substrate arranged on the base layer is preferably chosen such that synthetic grass blades of the base layer remain protruding thereabove.
  • the natural grass blades be longer than the synthetic grass blades. These latter then only appear when the natural grass has wholly or partially disappeared due to use or poor weather conditions. In this way the turf will still retain a green appearance, in any case from a distance.
  • the fibres give the top layer extra stability and protection, whereby intensity of use can be increased.
  • a layer of growth substrate in which the roots of the grass plants may become anchored.
  • the foundation can be any foundation used for natural grass or synthetic grass surfaces, such as soil, sand, or a substructure, foundation etc. If desired, shock-absorbing means such as layers of rubber can be applied to a substructure or foundation of for instance concrete.
  • a skilled person in the field of natural and/or synthetic grass surfaces is very well capable, without inventive work, of choosing the foundation suitable for a particular situation.
  • the term "foundation" will be used for any suitable base on which the combined turf according to the invention is used or which forms part of the surface.
  • the growth substrate can consist for instance of "infertile leaf mould", a mixture of sand and organic material, or of other top layer mixtures applied for natural grass surfaces .
  • Such growth substrates are generally known.
  • a surface manufactured by means of the base layer according to the invention is particularly suitable as sports-field, it can of course also be applied at other locations if desired, for instance in gardens, playgrounds and (recreational) parks, golf courses and the like. Precisely because the turf is in principle a natural grass surface, the applicability thereof is very wide-ranging.
  • the synthetic grass fibres can be implanted in the base layer according to the invention at a limited density per unit area because the natural grass forms the larger part of the combination turf. However, greater densities are also possible in determined conditions.
  • the base layer according to the invention can be supplied for instance on a roll and is therefore simple to use.
  • the base layer can be unrolled onto the desired foundation of growth substrate and cut or trimmed to size. No complex installations are required during laying of the turf for insertion of the synthetic grass blades, because the base layer is prefabricated and already contains the synthetic grass blades.
  • Manufacture of the base layer can also take place in simple manner on a weaving machine. Co-weaving of the synthetic grass fibres is carried out by gripper machines, bar looms or twin looms. Such techniques are generally known.
  • the invention further provides a method for laying a combined turf according to the invention, comprising the steps of: a. arranging a base layer as described above on a foundation; b. arranging a layer of growth substrate and grass seeds sown therein over the base layer, in such manner that the synthetic grass blades rise at least partially above the layer of growth substrate, c. causing the grass seed to germinate and raising grass plants, and d. mowing the natural grass to a length which is greater than the length of the synthetic grass blades.
  • a layer of growth substrate may be arranged thereon.
  • the step of arranging a layer of growth substrate including grass seeds over the base layer may further comprise the intermediate steps of: bl . at least partially working or strewing the growth substrate into the base layer, b2. sowing the grass seed into the growth substrate, and b3. arranging the remainder of the growth substrate over the grass seed.
  • the method may therefore include a number of variants. It is thus possible to place the base layer directly onto the foundation or onto a layer of growth substrate arranged on the foundation. Depending on the chosen option, the grass seed can then be sown directly onto the base layer, in a layer of growth substrate arranged on the base layer or on this layer of growth substrate. If desired, combinations can be applied. It is also possible, if desired, to sow in the foundation or the layer of growth substrate under the base layer. This is not recommended however, because the grass seeds will then usually lie too deep.
  • FIG. 1 shows a perspective detail view of a base layer according to the invention with separated parts
  • figure 2 shows a perspective detail view of a base layer according to the invention
  • figure 3 is a partly broken away perspective detail view of a part of a combined turf according to the invention with grass which is just germinating
  • figure 4 is a partly broken away perspective detail view of a part of a combined turf according to the invention with a number of adult grass plants.
  • Figures 1 and 2 show a base layer 1 consisting of a fabric 2 of series of non-degradable warp threads 3 and weft threads 4 alternating with series of biodegradable warp threads 5 and weft threads 6.
  • Synthetic grass fibres 7, preferably in a bundle 8 are co-woven such that the ends 9 and 10, which form grass blades, extend from the fabric at intersections 11 of non-degradable warp and weft threads. At each intersection the blades of for instance two successive bundles 8a and 8b extend outward.
  • the threads 5 and 6 can be omitted, whereby apertures are already created immediately in the fabric.
  • Figure 3 shows a first layer of growth substrate 12 onto which base layer 1 is placed.
  • the base layer according to the invention is simple to manufacture and easy to use.
  • the grass surfaces produced therewith moreover have all the advantages of natural grass and synthetic grass, while the most important drawbacks of both are avoided.

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Abstract

The invention relates to a base layer (1) for a combined synthetic and natural turf comprising a fabric (2), of which at least a part of the weft (4) and/or warp threads (3) is manufactured from a biodegradable material and/or is wholly absent so that the fabric (2) contains apertures, and synthetic turf fibres (7) which are least partially cowoven with the fabric and of which one or both ends form synthetic grass blades. These ends only protrude from the fabric (2) at those locations where the non-degradable warp and weft threads intersect. The base layer (1) is used in combined synthetic and natural turfs comprising a foundation, optionally a first layer of growth substrate and a base layer according to the invention which is provided with a second layer of growth substrate in which grass plants grow. The invention further relates to a method for laying a combined turf using the base layer of the invention.

Description

COMBINED TURF
The present invention relates to a base layer for a combined synthetic and natural turf, comprising: a fabric formed by a plurality of mutually substantially parallel warp threads and a plurality of mutually substantially parallel weft threads intersecting the warp threads, said fabric comprising a plurality of apertures, and a plurality of synthetic grass fibres connected at least partially to the fabric, at least one of the ends of each fibre protruding outside the fabric and forming a synthetic grass blade. Such a base layer is known, for instance from WO-A-9400639.
Up until a number of years ago a large number of sports were practiced on natural turf . Natural turf has the advantage that it is relatively soft and wounds and injuries are thereby seldom caused during falls, sliding tackles and the like. The great drawback of natural turf however is that it can deteriorate significantly in quality due to intensive use and/or weather conditions. What remains is a badly damaged field with large, bare (sand) surfaces which cannot be played on, or only with difficulty, and which have an unattractive appearance.
Synthetic grass surfaces have therefore already existed for a number of years, in particular for hockey, tennis and the like. Synthetic grass surfaces require less maintenance and withstand a more intensive use than natural turfs. However, the drawback of synthetic turf is that the frictional resistance is so high that wounds and/or injuries can be caused in the case of sliding tackles and undesired falls.
Therefore a hybrid turf or combination turf has already been proposed in the above mentioned patent document WO-A-9400639, in which the advantages of both types of turf are combined. This combination turf is formed by a conventional synthetic grass surface constituting a base layer on which a layer of growth substrate is strewn. Grass seed is sown into this growth substrate, so that the crowns of the grass ly between the synthetic grass fibres and are protected thereby. The synthetic grass is formed by a backing and a great number of upright synthetic grass fibres connected therewith. The synthetic grass fibres are regularly spaced, and may be connected to the backing by tufting or weaving. The backing is perforated, so as to allow water and roots of the natural grass to pass therethrough. As backing a coarse woven material is for instance proposed, wherein apertures are formed between the warp and weft threads . It is further proposed to construct the backing from two layers, an apertured top layer carrying the synthetic fibres and a bottom layer stabilizing the top layer with the fibres and preventing the fibres from becoming unstuck during handling of the synthetic grass. The bottom layer may be made from a biodegradable material, so that this will gradually disappear after the turf has been laid, leaving only the perforated top layer with the synthetic grass fibres.
In this known combination turf the emphasis is mainly on the synthetic grass, and there is relatively little room for growing a robust natural grass turf. Furthermore, the cost of the known combination turf is relatively high.
It is therefore the object of the present invention to provide a combination turf comprising a relatively high percentage of natural grass and which may be constructed and laid for a relatively moderate cost. This is achieved according to the invention by making use for the combined synthetic and natural turf of a base layer as described above, in which the fibre ends forming the synthetic grass blades protrude from the fabric at location where the weft threads and the warp threads intersect. By forming the synthetic grass blades exclusively at the intersections of the warp and weft threads, and not at those locations where only warp threads or weft threads are present, a base layer is obtained in which there is relatively much room for arranging natural grass. Furthermore, since the synthetic grass fibres protrude from the fabric at the intersections of warp and weft threads, the loads are transmitted to the base layer at those locations where this is strongest. It is preferable to have the synthetic grass fibres woven into the fabric, whereby a very strong connection is formed.
The apertures in the base layer may be formed immediately during manufacture thereof by enlarged spaces between adjacent warp and/or weft threads, but it is also possible to form the apertures only during use of the base layer by decomposition of warp and/or weft threads made from a biodegradable material .
The above described base layer may be arranged between two layers of growth substrate, with grass being sown in the top layer. Due to the apertures, which are present from the start or are created in the course of time by decay or decomposition of the biodegradable threads, the roots of the natural grass plants have the opportunity to grow through the base layer and to become anchored in the bottom layer of growth substrate and possibly also at least partially in the base layer. Optimal rooting hereby becomes possible while the additional strength of the remaining fabric threads and synthetic grass blades is still retained. Alternatively, it is also possible to suffice with one layer of growth substrate which is arranged on the base layer placed on a foundation. The roots can then become anchored in the layer of growth substrate, the foundation and/or the base layer. The base layer according to the invention preferably has a grid pattern. In such a case the base layer consists of a fabric of a plurality of series of non-degradable weft threads and a plurality of series of biodegradable weft threads alternating with these series, as well as a plurality of series of non-degradable warp threads intersecting the weft threads and a plurality of series of biodegradable warp threads alternating with these series, and the ends of the synthetic grass fibres protrude from the fabric at locations where the series of non-degradable weft threads and non-degradable warp threads intersect. Relatively robust pieces of fabric thus remain at the intersections of the non-degradable weft and warp threads. In the course of time holes will occur at intersections of biodegradable weft and warp threads. The thus resulting coarse-mesh network is held in place by a layer of growth substrate arranged thereon. The biodegradable material is for instance jute, coconut fibre, sisal or biodegradable polymers. As additional benefit, many biodegradable threads such as jute and the like have the advantage that they retain moisture well. This is of particular importance, certainly in the initial stages of the development of the turf. Both the biodegradable threads and the non- degradable threads can optionally be impregnated or coated with fertilizers.
It is particularly recommended that the artificial grass fibres are monofilament fibres. In contrast to the fibrillated yarns normally used in synthetic grass surfaces, such monofilament fibres look more like grass blades. If desired however, fibrillated yarns or combinations of different types of yarn can also be used in the base layer according to the present invention.
Synthetic grass fibres are of course usually green. It is however possible according to the present invention for at least a part of the synthetic grass fibres to have at least one colour other than green. A pattern, such as the lines of a playing field or a club logo, can hereby be formed in the synthetic grass part of the combined turf. An advertizing message can also be envisaged here. Fibres with a colour other than green will become particularly clear when the playing field is damaged. Coloured fibres can optionally be used at the location of the pattern which are the same length as the natural grass and planted more densely in the foundation. The pattern is thus also visible when the natural grass is intact. Repeated application of new chalk lines for playing field lines in particular is thus avoided.
In order to promote growth of the natural grass preferably at least part of the fabric of the base layer is impregnated or coated with fertilizers.
For extra strength at least some of the non- degradable threads could be melting threads. During manufacture of the base layer these melting threads can be heated, whereby they fuse together at the intersections of weft and warp threads.
The length of the synthetic grass fibres can be chosen as desired and depends for instance on the distance over which the fibre is co-woven with the fabric and on the thickness of the layer of growth substrate arranged on the base layer as well as on the desired length of the protruding synthetic grass blades.
Synthetic grass fibres are per se known. Synthetic grass fibres are made for instance from polyolefins, polyamides or fibres of natural or non- natural material. The materials used are preferably resistant to wear under mechanical load and to UV radiation. Synthetic grass fibres are obtainable for instance under the brand names Thiolon™, Trofil™ etc. The invention also relates to a combined synthetic and natural turf comprising a foundation, a base layer as described above arranged thereon and a layer of growth substrate in which grass plants grow arranged on the base layer. The thickness of the layer of growth substrate arranged on the base layer is preferably chosen such that synthetic grass blades of the base layer remain protruding thereabove. However, in order to achieve the advantages of natural grass it is recommended that the natural grass blades be longer than the synthetic grass blades. These latter then only appear when the natural grass has wholly or partially disappeared due to use or poor weather conditions. In this way the turf will still retain a green appearance, in any case from a distance. In addition, the fibres give the top layer extra stability and protection, whereby intensity of use can be increased.
Also between the foundation and the base layer may be arranged a layer of growth substrate, in which the roots of the grass plants may become anchored.
The foundation can be any foundation used for natural grass or synthetic grass surfaces, such as soil, sand, or a substructure, foundation etc. If desired, shock-absorbing means such as layers of rubber can be applied to a substructure or foundation of for instance concrete. A skilled person in the field of natural and/or synthetic grass surfaces is very well capable, without inventive work, of choosing the foundation suitable for a particular situation. In this application the term "foundation" will be used for any suitable base on which the combined turf according to the invention is used or which forms part of the surface.
The growth substrate can consist for instance of "infertile leaf mould", a mixture of sand and organic material, or of other top layer mixtures applied for natural grass surfaces . Such growth substrates are generally known.
Although a surface manufactured by means of the base layer according to the invention is particularly suitable as sports-field, it can of course also be applied at other locations if desired, for instance in gardens, playgrounds and (recreational) parks, golf courses and the like. Precisely because the turf is in principle a natural grass surface, the applicability thereof is very wide-ranging.
The synthetic grass fibres can be implanted in the base layer according to the invention at a limited density per unit area because the natural grass forms the larger part of the combination turf. However, greater densities are also possible in determined conditions.
The base layer according to the invention can be supplied for instance on a roll and is therefore simple to use. The base layer can be unrolled onto the desired foundation of growth substrate and cut or trimmed to size. No complex installations are required during laying of the turf for insertion of the synthetic grass blades, because the base layer is prefabricated and already contains the synthetic grass blades.
Manufacture of the base layer can also take place in simple manner on a weaving machine. Co-weaving of the synthetic grass fibres is carried out by gripper machines, bar looms or twin looms. Such techniques are generally known.
The invention further provides a method for laying a combined turf according to the invention, comprising the steps of: a. arranging a base layer as described above on a foundation; b. arranging a layer of growth substrate and grass seeds sown therein over the base layer, in such manner that the synthetic grass blades rise at least partially above the layer of growth substrate, c. causing the grass seed to germinate and raising grass plants, and d. mowing the natural grass to a length which is greater than the length of the synthetic grass blades. In order to provide a good nutritient medium for the roots of the grass plants, prior to arranging the base layer on the foundation a layer of growth substrate may be arranged thereon.
The step of arranging a layer of growth substrate including grass seeds over the base layer may further comprise the intermediate steps of: bl . at least partially working or strewing the growth substrate into the base layer, b2. sowing the grass seed into the growth substrate, and b3. arranging the remainder of the growth substrate over the grass seed. According to the invention the method may therefore include a number of variants. It is thus possible to place the base layer directly onto the foundation or onto a layer of growth substrate arranged on the foundation. Depending on the chosen option, the grass seed can then be sown directly onto the base layer, in a layer of growth substrate arranged on the base layer or on this layer of growth substrate. If desired, combinations can be applied. It is also possible, if desired, to sow in the foundation or the layer of growth substrate under the base layer. This is not recommended however, because the grass seeds will then usually lie too deep.
In the present application the terms "grass surface" and "turf" are used interchangeably. The present invention will be further elucidated on the basis of the annexed drawings in which corresponding reference numerals refer to corresponding components and in which: figure 1 shows a perspective detail view of a base layer according to the invention with separated parts; figure 2 shows a perspective detail view of a base layer according to the invention; figure 3 is a partly broken away perspective detail view of a part of a combined turf according to the invention with grass which is just germinating; and figure 4 is a partly broken away perspective detail view of a part of a combined turf according to the invention with a number of adult grass plants. Figures 1 and 2 show a base layer 1 consisting of a fabric 2 of series of non-degradable warp threads 3 and weft threads 4 alternating with series of biodegradable warp threads 5 and weft threads 6. Synthetic grass fibres 7, preferably in a bundle 8, are co-woven such that the ends 9 and 10, which form grass blades, extend from the fabric at intersections 11 of non-degradable warp and weft threads. At each intersection the blades of for instance two successive bundles 8a and 8b extend outward. In an alternative embodiment of the invention the threads 5 and 6 can be omitted, whereby apertures are already created immediately in the fabric. Figure 3 shows a first layer of growth substrate 12 onto which base layer 1 is placed. The foundation or substructure for the whole construction are not shown in detail . In a second layer of growth substrate 13 are sown grass seeds 14, only a few of which are shown for the sake of clarity. In the situation shown, the seeds have just germinated. In figure 4 the grass plants 15 are adult and their roots 16 extend into the lower layer of growth substrate. The natural grass blades 17 are longer than synthetic grass blades 18. In figure 3 the biodegradable threads 5, 6 are still present . In figure 4 they have decomposed or have never been present, thereby resulting in apertures 19.
The base layer according to the invention is simple to manufacture and easy to use. The grass surfaces produced therewith moreover have all the advantages of natural grass and synthetic grass, while the most important drawbacks of both are avoided.

Claims

1. Base layer for a combined synthetic and natural turf, comprising: a fabric formed by a plurality of mutually substantially parallel warp threads and a plurality of mutually substantially parallel weft threads intersecting the warp threads, said fabric comprising a plurality of apertures, and a plurality of synthetic grass fibres connected at least partially to the fabric, at least one of the ends of each fibre protruding outside the fabric and forming a synthetic grass blade, characterized in that the fibre ends forming the synthetic grass blades protrude from the fabric at location where the weft threads and the warp threads intersect .
2. Base layer as claimed in claim 1, characterized in that the synthetic grass fibres are woven into the fabric .
3. Base layer as claimed in claim 1 or 2 , characterized in that the apertures are formed by enlarged spaces between adjacent warp and/or weft threads.
4. Base layer as claimed in any one of the preceding claims, characterized in that the apertures are formed during use of the base layer by warp and/or weft threads made from a biodegradable material.
5. Base layer as claimed in claim 4, characterized in that the fabric is formed by a plurality of series of non-biodegradable weft threads and a plurality of series of biodegrabable weft threads alternating with these series and a plurality of series of non-biodegraba- ble warp threads intersecting the weft threads and a plurality of series of biodegradable warp threads alternating with these series, and in that the ends of the synthetic grass fibres protrude from the fabric at the intersections of these series of non-biodegradable warp threads and non-biodegradable weft threads.
6. Base layer as claimed in claim 4 or 5 , characterized in that the biodegradable material is chosen from jute, sisal, coconut fibre, or biodegradable polymers .
7. Base layer as claimed in any one of the preceding claims, characterized in that the artificial grass fibres are monofilament fibres.
8. Base layer as claimed in any one of the preceding claims, characterized in that at least part of the synthetic grass fibres has at least one colour other than green .
9. Base layer as claimed in claim 8, characterized in that the synthetic grass fibres having different colours form a pattern like lines of a sportsfield or a club logo.
10. Base layer as claimed in any one of the preceding claims, characterized in that at least part of the fabric is impregnated or coated with fertilizers.
11. Base layer as claimed in any one of the preceding claims, characterized in that at least part of the non biodegradable threads comprise melting threads.
12. Combined synthetic and natural turf, comprising a foundation, a base layer as claimed in any one of the preceding claims arranged thereon, and a layer of growth substrate in which grass plants may grow arranged on the base layer.
13. Combined turf as claimed in claim 12, characterized in that the thickness of the layer of growth substrate on the base layer is chosen such that the synthetic grass blades of the base layer protrude thereabove .
14. Combined turf as claimed in claim 12 or 13, characterized by a layer of growth substrate arranged between the foundation and the base layer.
15. Combined turf as claimed in any one of claims 12 to 14, characterized in that the growth substrate consists of "infertile leaf mould", a mixture of sand and an organic material, or top layer mixtures applied in natural grass turfs.
16. Combined turf as claimed in any one of claims 12 to 15, characterized in that the turf is used as sportsfield or as grass turf in gardens, playgrounds, (recreational) parks or golf courses.
17. Method for creating a combined turf as claimed in any one of claims 12 to 16, comprising the steps of: a. arranging a base layer as claimed in any of of claims 1 to 11 on a foundation; b. arranging a layer of growth substrate and grass seeds sown therein over the base layer, in such manner that the synthetic grass blades rise at least partially above the layer of growth substrate, c. causing the grass seed to germinate and raising grass plants, and d. mowing the natural grass to a length which is greater than the length of the synthetic grass blades.
18. Method as claimed in claim 17, characterized in that prior to arranging the base layer on the foundation a layer of growth substrate is arranged thereon.
19. Method as claimed in claim 17 or 18, cha- racterized in that the step of arranging a layer of growth substrate including grass seeds over the base layer comprises the intermediate steps of: bl . at least partially working or strewing the growth substrate into the base layer, b2. sowing the grass seed into the growth substrate, and b3. arranging the remainder of the growth substrate over the grass seed.
PCT/NL1997/000659 1996-11-29 1997-12-01 Combined turf WO1998023817A1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
CA002285639A CA2285639C (en) 1996-11-29 1997-12-01 Combined turf
JP52457398A JP3359041B2 (en) 1996-11-29 1997-12-01 Mixed turf
DK97948006T DK0941387T3 (en) 1996-11-29 1997-12-01 Combined green weather
AU54166/98A AU730960B2 (en) 1996-11-29 1997-12-01 Combined turf
EP97948006A EP0941387B1 (en) 1996-11-29 1997-12-01 Combined turf
DE69705535T DE69705535T2 (en) 1996-11-29 1997-12-01 COMBINATION LAWN
AT97948006T ATE202814T1 (en) 1996-11-29 1997-12-01 COMBINATION LAWN
US09/320,776 US6242062B1 (en) 1996-11-29 1999-05-27 Combined turf
NO19992606A NO313246B1 (en) 1996-11-29 1999-05-31 Base layer for a combined synthetic and natural peat material, such a combined peat material and a single process for producing a combined peat material
US09/767,519 US6372310B2 (en) 1996-11-29 2001-01-23 Combined and stabilized turf for an athletic field
GR20010401640T GR3036779T3 (en) 1996-11-29 2001-10-03 Combined turf

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1004656A NL1004656C2 (en) 1996-11-29 1996-11-29 Combination lawn.
NL1004656 1996-11-29

Related Child Applications (1)

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US09/320,776 Continuation US6242062B1 (en) 1996-11-29 1999-05-27 Combined turf

Publications (1)

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WO1998023817A1 true WO1998023817A1 (en) 1998-06-04

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Country Status (14)

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US (2) US6242062B1 (en)
EP (1) EP0941387B1 (en)
JP (1) JP3359041B2 (en)
AT (1) ATE202814T1 (en)
AU (1) AU730960B2 (en)
CA (1) CA2285639C (en)
DE (1) DE69705535T2 (en)
DK (1) DK0941387T3 (en)
ES (1) ES2158598T3 (en)
GR (1) GR3036779T3 (en)
NL (1) NL1004656C2 (en)
NO (1) NO313246B1 (en)
PT (1) PT941387E (en)
WO (1) WO1998023817A1 (en)

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US6372310B2 (en) 1996-11-29 2002-04-16 Southwest Recreational Industries, Inc. Combined and stabilized turf for an athletic field
US6094860A (en) * 1997-06-06 2000-08-01 Technology Licensing Corp. Stabilized turf for athletic field
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US6035577A (en) * 1998-12-03 2000-03-14 Technology Licensing Corp Temporarily stabilized natural turf
US6753049B2 (en) 1999-12-02 2004-06-22 De Vries Hugo Artificial turf including damping material
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WO2007125268A2 (en) 2006-05-02 2007-11-08 Edmond-Pierre Picard Natural turf, means and process for manufacturing such a natural turf
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EP3130704B1 (en) 2015-08-11 2019-07-17 heiler GmbH & Co. KG Fibre-reinforced turf support layer and method of processing thereof
EP3130704B2 (en) † 2015-08-11 2023-02-22 heiler GmbH & Co. KG Fibre-reinforced turf support layer and method of processing thereof
RU2764735C1 (en) * 2021-06-15 2022-01-20 Алексей Александрович Зайцев Method for forming a rolled combined grass cover

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DE69705535D1 (en) 2001-08-09
NO992606L (en) 1999-07-29
PT941387E (en) 2001-11-30
JP2000511607A (en) 2000-09-05
DK0941387T3 (en) 2001-09-24
NO992606D0 (en) 1999-05-31
GR3036779T3 (en) 2002-01-31
NO313246B1 (en) 2002-09-02
ATE202814T1 (en) 2001-07-15
DE69705535T2 (en) 2002-03-28
AU5416698A (en) 1998-06-22
ES2158598T3 (en) 2001-09-01
US20010007700A1 (en) 2001-07-12
CA2285639A1 (en) 1998-06-04
NL1004656A1 (en) 1998-06-09
JP3359041B2 (en) 2002-12-24
US6242062B1 (en) 2001-06-05
EP0941387A1 (en) 1999-09-15
US6372310B2 (en) 2002-04-16
EP0941387B1 (en) 2001-07-04
NL1004656C2 (en) 1998-07-02
AU730960B2 (en) 2001-03-22
CA2285639C (en) 2005-04-26

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