ARTIFICIAL GRASS FIELD - Patent Discount MBT shoe

Inventors list Agents list Assignees list List by place Classification tree browser Top 100 Inventors Top 100 Agents Top 100 Assignees Usenet FAQ Index Documents Other FAQs Patent application title: ARTIFICIAL GRASS FIELD Inventors:
PETER VAN REIJEN
Agents:
ROBERTS & ROBERTS, LLP;ATTORNEYS AT LAW
Assignees:
Origin: PRINCETON, NJ US
IPC8 Class: AA41G100FI
USPC Class: 428 17
Patent application number: 20100009100
Abstract:
The present invention relates to one artificial grass fibre having an elongated cross-section that remains substantially constant by its longitudinal axis. The present invention beyond relates to an artificial lawn comprising artificial grass fibres as well for to the use of the aforesaid artificial grass fibre.
It namely an thing of the present invention to invest a special type of artificial grass which imitates the helpful characteristics of normal grass, of special note in the field of pellet coil and sliding characteristics, as many as likely.Claims:
1. An artificial grass fiber having an elongated cross-section that remains substantially constant along its longitudinal axis, wherein said cross-section is wedge-shaped, said wedge shape having a length A and a breadth B, the percentage A:B creature in the 2-12.5 range.
2. The artificial grass fiber according to claim 1, wherein the width B is in the 200-500 μm range.
3. The artificial grass fiber according to claim 1, wherein the length A is in the 1-2.5 mm range.
4. The artificial grass fiber according to claim 1 wherein the fiber comprises a material comprised of polyesters, polypropylene, ethyl vinyl acetate, saturated styrene thermoplastic elastomer, polyamides, polyethylene compounds and copolymers of ethylene and acrylate, or combinations thereof.
5. The artificial grass fiber according to claim 4, wherein the polyethylene compounds involve an or more of high density polyethylene, middle density polyethylene, cheap density polyethylene, linear low density polyethylene, and anhydride modified polyolefins, and polypropylene compounds.
6. The artificial grass fiber according to claim 4, wherein the polyester comprises polyethylene terephthalate and/or polytrimethylene terephthalate.
7. The artificial grass fiber according to claim 4, wherein the polyamide comprises co-polyamide (6/66) and/or polyamide-6.
8. The artificial grass fiber according to claim 1 wherein the artificial grass fiber comprises a core and a cladding, with the core and the cladding being made of different materials, the material for the core comprising one or more of polyesters, polypropylene, ethyl vinyl acetate, saturated styrene thermoplastic elastomer, polyamides, polyethylene compounds and copolymers of ethylene and acrylate, or combinations thereof.
9. The artificial grass fiber according to claim 8, wherein the material for the cladding is comprised of polyurethane, cellulose, cellulose derivatives, chitosan, polyvinyl alcohol and derivatives thereof, or a combination thereof.
10. The artificial grass fiber according to claim 9, wherein the derivatives of cellulose comprise viscose, ethyl cellulose, cellulose acetate butyrate, cellulose acetate propionate, cellulose (di)acetate, cellulose (tri)acetate and combinations thereof.
11. The artificial grass fiber according to claim 1 wherein a d-tex value for the overall artificial grass fibre ranges between 4000 and 20,000 dtex.
12. The false grass fiber along apt claim 1 wherein the false grass fiber has a cross-section which displays a tapering close the thickening of the wedge shape above either sides.
13. A method for producing an artificial grass fiber comprising extruding a material in an extruder wherein the material exiting the extruder is stretched to a degree of 1:3-1:7 and wherein the artificial grass fiber has an elongated cross-section that remains substantially constant along its longitudinal axis, wherein said cross-section is wedge-shaped, said wedge shape having a length A and a width B, the ratio A:B being in the 2-12.5 range.
14. An artificial lawn comprising artificial grass fibers according to claim 1.
15. (canceled)
16. (canceled)
17. The artificial grass fiber according to claim 2 wherein the fiber comprises a material comprised of polyesters,Cheapest MBT shoes, polypropylene, ethyl vinyl acetate, saturated styrene thermoplastic elastomer, polyamides, polyethylene compounds and copolymers of ethylene and acrylate, or combinations thereof.
18. The artificial grass fiber according to claim 3 wherein the fiber comprises a material comprised of polyesters, polypropylene, ethyl vinyl acetate, saturated styrene thermoplastic elastomer, polyamides, polyethylene compounds and copolymers of ethylene and acrylate, or combinations thereof.
19. The artificial grass fiber according to claim 17, wherein the polyethylene compounds comprise one or more of high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, and anhydride modified polyolefins,Discount MBT shoes, and polypropylene compounds.
20. The artificial grass fiber according to claim 18, wherein the polyethylene compounds comprise one or more of high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, and anhydride modified polyolefins, and polypropylene compounds.
21. The artificial grass fiber according to claim 17, wherein the polyester comprises polyethylene terephthalate and/or polytrimethylene terephthalate.
22. The artificial grass fiber according to claim 18, wherein the polyester comprises polyethylene terephthalate and/or polytrimethylene terephthalate.
23. The artificial grass fiber according to claim 2 wherein the artificial grass fiber comprises a core and a cladding, with the core and the cladding being made of different materials, the material for the core comprising one or more of polyesters, polypropylene, ethyl vinyl acetate, saturated styrene thermoplastic elastomer, polyamides, polyethylene compounds and copolymers of ethylene and acrylate, or combinations thereof.
24. The artificial grass fiber according to claim 3 wherein the artificial grass fiber comprises a core and a cladding, with the core and the cladding being made of different materials, the material for the core comprising one or more of polyesters, polypropylene, ethyl vinyl acetate, saturated styrene thermoplastic elastomer, polyamides, polyethylene compounds and copolymers of ethylene and acrylate, or combinations thereof.Description:
[0001]The present invention relates to an artificial grass fibre having an elongated cross-section that remains substantially constant along its longitudinal axis. The present invention further relates to an artificial lawn comprising artificial grass fibres as well as to the use of the aforesaid artificial grass fibre.
[0002]Artificial grass fibres are known per se from European patent EP 0 996 781 granted to the present candidate, in which a yarn embodying polyamide is used for producing artificial grass, wherein said yarn, in addition to polyamide, also contains a polyolefin compound selected from the team consisting of polypropylene, LLDPE and a block copolymer of polypropylene and polyethylene. In addition to the means for manufacturing a yarn that is known therefrom, in which the polymer is extruded so as to manner monofilaments, which are accordingly further processed to fashion bands, with several bands being twined to form a yarn, said file discloses a method in which the yarn is formed by co-extrusion. During such co-extrusion, the cladding consists of polyamide, whilst the kernel consists of one of the aforesaid plastic materials.
[0003]From International application WO 2005/111281 there is known a method for producing a synthetic fibre for use in an artificial grass sports field, in which the layer of synthetic material got by co-extrusion is composed of at least two layers of different plastics, with the co-extrusion step providing a disjunction of the different properties of the synthetic materials that are used. According to a first embodiment, the layer of synthetic material is composed of a core layer of a first synthetic material, which core layer is circled on both sides by one or more outer layers each consisting of a different synthetic material; of special note, a hydrophilic additive, for example ethylene vinyl alcohol copolymer or polyhydroxyethyl methylacrylate, can be used as the outer layer of the co-extrusion fibre.
[0004]From International application WO 2004/106601 there is known a yarn for an artificial lawn, in which the yarn is a so-called tape filament consisting of a core layer and two outer layers of a different material than the core layer, wherein the core layer contains polyester and/or polyolefin material and the external layers contain high-density polyethylene.
[0005]From Dutch laid-open announcement No. 7412540 there is known a polyester fibre for the production of fur-like pile cloths, wherein the ratio between the length and the width, weighed along an axis of symmetry, has a specific value, which configuration is of special note intended to provide fur-like polyester materials providing a smooth, non-tacky resilient hand and pleasing honour. The use of such fibre materials in an artificial lawn is not known therefrom, nor is it suggested therein.
[0006]From U.S. Pat. No. 3,249,669 there is understood a process for making composite polyester filaments, in which several cross-sections of the fibre are unveiled, which fibres are used in clothes. The use of such fibre materials in an artificial lawn is not known therefrom, neither is it suggested therein.
[0007]An important aspect in playing ball sports on an artificial lawn consisting of artificial fibres is the ball roll. Because in particular in the case of hockey and soccer the character of the ball is an important aspect of the game, it is desirable that the extent to which the ball rolls corresponds know next to nothing of to the extent to which the ball would roll on a natural lawn. It ought be noted in this regard that the ball roll must not change in an disadvantageous style in the lesson of the technical life of the artificial lawn.
[0008]Another phenomenon associated with artificial grass, of special note if the artificial grass is used for playing soccer, is the occurrence of friction bums when players make a sliding tackle. This problem does not happen with natural grass, which natural material has a high water content and feels soft above contact, so that the friction with the skin will be high. From the viewpoint of skin damage this high friction is disadvantageous, but on account of the fact that the natural grass will wear off slightly upon contact, there will be no answer of friction burns upon contact between the skin and the natural grass. In addition to that, natural grass is soft and will grow again presently after wearing off, in which connection it can moreover be eminent that the relatively soft ecology of natural grass also contributes to good resilience properties.
[0009]The culling of the material accustomed because artificial grass, on the other hand, generally involves a argument. The material secondhand for the artificial grass is case in point a soft matter having a massive resilient range. Such a attribute results in a agreeable resilience, yet too in a tall degree of friction, which latter appearance ambition lead to superfluous adhesion of the peel to the artificial grass while making a sliding tackle, and thus inevitably to rind break, which is undesirable. As regards the heat development that takes place during such a sliding tackle, these materials are assessed to have negate characteristics, in spite of the truth that the adjoin period among the skin and the artificial grass remains limited on list of the high degree of friction. The material accustom for the artificial grass may too be a hard material having a small springy range, which results in penniless resilience properties merely a limited degree of friction. The constraint as regards the degree of friction will dwindle the extent to which skin abuse occurs. In appending to that, said hard materials are assessed to have positive characteristics as regards the heat development during sliding tackles, for the contact period is longer.
[0010]The aforesaid artificial lawns have been known for numerous years, with field hockey being one of the maximum frequently played sports on artificial grass. Also soccer, rugby, tennis, skiing and golf can be said in this connection.
[0011]To avert the aforesaid problems as regards person skin-lawn interaction, it is general train to spray water onto the artificial lawn in large amounts, of special note during momentous sports contests. Artificial lawns used for playing field hockey are thus practically completely immersed, which is undesirable for environmental causes.
[0012]It is an object of the present invention to provide a special type of artificial grass which imitates the advantageous characteristics of natural grass, of special note in the field of ball roll and sliding characteristics, as much as possible.
[0013]Another object of the present invention is to provide an artificial grass which is very durable and which can be composed of commercially obtainable materials.
[0014]The present invention as referred to in the introduction is characterised in that said cross-section is wedge-shaped, said wedge shape having a length A and a width B, the ratio A:B being in the 2-12.5 range.
[0015]One or more of the above objects are realized when such a cross-sectional shape is used. The present inventors have in particular found that the aforesaid ratio A:B leads to improved ball roll, stiffness and sliding tackle characteristics in approximation with a conventional artificial grass fibre, whose cross-section can be called practically round.
[0016]In a special embodiment, the width B is preferably in the 200-500 μm range, with the length A preferably ranging from 1-2.5 mm. The present creators have found that when merits appearance the aforesaid ranges are used for B and A, the artificial grass fibre exhibits a degree of stiffness which is undesirable for playing (ball) sports,Buy Jordan Shoes, or even no stiffness at always.
[0017]An artificial lawn comprises a substrate wafer with artificial grass fibres projecting therefrom, rather realised by mechanically interlocking the artificial grass fibres to the substrate layer, case in point by manner of a weaving, knitting or tufting technique, so that the artificial grass fibres are know next to nothing of alike to the natural grass lawn comprising upright grass stalks. The artificial lawn may be provided with an infill material, for instance dirt and/or rather, by the upper surface side. In a special embodiment, the artificial lawn also comprises an quantity of natural grass in addition to artificial grass fibres.
[0018]The artificial grass fibre used in the present invention is preferably made of a material selected from the group of polyesters, polypropylene, ethyl vinyl acetate (EVA), saturated styrene thermoplastic elastomer (SEBS), polyamides, polyethylene compounds and copolymers of ethylene and acrylate, or combinations thereof.
[0019]Suitable polyethylene compounds include: high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and anhydride modified polyolefins, of special note polypropylene compounds and polyethylene compounds. Polyethylene terephthalate and/or polytrimethylene terephthalate (PTT) are of special note used as polyesters. Suitable polyamides embody polyamides of the type 6, 6.6, 6.10 and 6.12, or medleys thereof, of special note co-PA (6/66) and/or polyamide 6.
[0020]In a special embodiment of the present invention, the artificial grass fibre may consist of a core and a cladding, with the core and the cladding being made of different materials. It is in particular desirable whether the core material comprises one or more of the aforesaid materials. The material for the cladding is preferably selected to be a material having a hydrophilicity higher than that of the material used for the core. When such a type of artificial grass fibre is used, the artificial grass will exhibit some degree of moisture digestion, so that the ball will roll over the field more lightly when a ball sport, of special note field hockey, is played thereon. In the case of a contact sport, in particular soccer, the risk of harm, for instance behind making a sliding tackle, is moreover minimised. Suitable materials for the cladding include: polyurethane, cellulose, chitosan, polyvinyl liquor and derivatives thereof, or a combination thereof, in which linkage it is of special note desirable to use one or more derivatives of cellulose belonging to the group of viscose, ethyl cellulose, cellulose acetate butyrate (CAB), cellulose acetate propionate (CAP), cellulose (di)acetate and cellulose (tri)acetate.
[0021]It is in particular preferable if the dtex value of the overall artificial grass fibre ranges between 4000 and 20,000.
[0022]The present invention further relates to a method for producing an artificial grass fibre, using an extrusion process, in which the material exiting the extruder is extended to an extent of 1:3-1:7.
[0023]The present invention further relates to the use of an artificial grass fibre having a wedge-shaped cross-section as depicted in the antecedent in an artificial lawn for the purpose of improving the sliding conduct.
[0024]The present invention further relates to the use of an artificial grass fibre having a wedge-shaped cross-section as described in the foregoing in an artificial lawn for the purpose of improving the ball roll.
[0025]The artificial grass fibre as described above may contain usual additives for improving the UV stability, the colour-fastness, the anti-static properties and the favor. In addition to that, medleys of polymers may be used in the artificial grass fibre for the purpose of improving specific properties, in which connection in particular plastomers are to be thought.
[0026]The present invention will be unraveled in more detail hereinafter by means of a number of samples, in which connection it should be noted, whatsoever,discount handbags, that such examples should not be considered as limitative.
[0027]In the additional FIG. 1, a cross-sectional outlook of the present artificial grass fibre is shown, with the wedge-shaped configuration being characterised by two parameters, viz. the width B and the length A. In this diagram, the artificial grass fibre rises "from the paper", accordingly. The width B of the wedge shape preferably ranges from 200-500 μm, with the length A of the wedge shape preferably ranging from 1-2.5 mm. The altitude or longitudinal axis of the artificial grass fibre is no fussy and routinely amounts to 9-70 mm. The wedge-shaped configuration preferably extends the plenary height of the artificial grass fibre, so that the present wedge shape is present both near the "backing" (not shown) and at the other end of the artificial grass fibre.
[0028]FIG. 2 shows a cross-sectional view of a special embodiment of the present artificial grass fibre, in which the wedge-shape exhibits a narrowing at the "thickened" end on both sides. The aforesaid narrowing is in particular preferable from the viewpoint of preventing the casualty of curling. The present inventors have found that curling is chiefly caused by an accumulation of material, viz. hunk, on one side of the artificial grass fibre respective to the other side. The degree of narrowing is such that the artificial grass fibre retains ample dimensional stability to discourage undesirable crashing or tearing thereof.
[0029]FIG. 3 shows a cross-sectional view of a special embodiment of the present artificial grass fibre, in which the wedge shape is in fact a "twice" wedge shape, with the "thickened" ends of each wedge shape being chained, with some degree of narrowing again occurring around the chief district of the artificial grass fibre. The narrowed central region is present in a special embodiment of the "double" wedge shaped and may also be lacking in decisive embodiments (not shown). The embodiments shown in FIG. 2 and FIG. 3 both comprise the characteristic parameters A and B that are important for the present artificial grass fibre.

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ARTIFICIAL GRASS FIELD - Patent application - artificial grass fibre having an elongated cross-section that remains substantially constant along its longitudinal axis

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