NZ798427B2 - Infill for artificial turf system - Google Patents
Infill for artificial turf system Download PDFInfo
- Publication number
- NZ798427B2 NZ798427B2 NZ798427A NZ79842718A NZ798427B2 NZ 798427 B2 NZ798427 B2 NZ 798427B2 NZ 798427 A NZ798427 A NZ 798427A NZ 79842718 A NZ79842718 A NZ 79842718A NZ 798427 B2 NZ798427 B2 NZ 798427B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- wood particles
- infill material
- artificial turf
- spring rate
- wood
- Prior art date
Links
- 239000002245 particle Substances 0.000 claims abstract 45
- 239000002023 wood Substances 0.000 claims abstract 41
- 239000000463 material Substances 0.000 claims abstract 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract 8
- 229920001971 elastomer Polymers 0.000 claims abstract 2
- 239000005060 rubber Substances 0.000 claims abstract 2
- 239000004576 sand Substances 0.000 claims 11
- 244000025254 Cannabis sativa Species 0.000 claims 5
- 239000006260 foam Substances 0.000 claims 5
- 229920003020 cross-linked polyethylene Polymers 0.000 claims 4
- 239000004703 cross-linked polyethylene Substances 0.000 claims 4
- -1 polyethylene Polymers 0.000 claims 4
- 230000000717 retained effect Effects 0.000 claims 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 2
- 239000004698 Polyethylene Substances 0.000 claims 2
- 239000004743 Polypropylene Substances 0.000 claims 2
- 239000000203 mixture Substances 0.000 claims 2
- 229920000573 polyethylene Polymers 0.000 claims 2
- 229920001155 polypropylene Polymers 0.000 claims 2
- 239000012858 resilient material Substances 0.000 claims 2
- 229920002943 EPDM rubber Polymers 0.000 claims 1
- 239000011324 bead Substances 0.000 claims 1
- 239000007799 cork Substances 0.000 claims 1
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 235000011187 glycerol Nutrition 0.000 claims 1
- 239000011121 hardwood Substances 0.000 claims 1
- 239000002991 molded plastic Substances 0.000 claims 1
- 230000008447 perception Effects 0.000 claims 1
- 239000011122 softwood Substances 0.000 claims 1
- 241000894007 species Species 0.000 claims 1
- 229920003048 styrene butadiene rubber Polymers 0.000 claims 1
- 229920002725 thermoplastic elastomer Polymers 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract 2
- 229920002994 synthetic fiber Polymers 0.000 abstract 1
- 229920001169 thermoplastic Polymers 0.000 abstract 1
- 239000004416 thermosoftening plastic Substances 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
- B27L11/02—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood shavings or the like
-
- 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
Abstract
infill material (24) for an artificial turf system having a plurality of wood particles (24B), each particle defining a length dimension greater than a width or a thickness dimension, with the length and width or thickness defining an aspect ratio of up to 10:1. The length of each particle is oriented generally parallel to a grain structure of each particle, with the length ranging from 0.5mm to about 10mm. The wood particles have a generally rounded edge. Each particle can absorb and release water, allowing the dispersal of heat from the infill material. The use of synthetic materials such as rubber and thermoplastics in artificial turf systems leads to turf heat retention problems, necessitating the use of complex cooling systems. Additionally, the disposal of synthetic infill materials is increasingly costly and problematic. The invention provides a wood-based infill material that naturally incorporates cooling based on the water absorptive properties of wood particles.
Claims (28)
1. An infill material for an artificial turf assembly comprising: a plurality of wood particles, the plurality of wood particles defining a length dimension greater than a width or a thickness dimension, the length dimension being oriented generally parallel to a grain structure of the wood particles, the length dimension in a range of about 0.5mm to about 10mm, the length and one of the width or thickness dimensions defining an aspect ratio within a range of 1:2 to 10:1, the plurality of wood particles having a generally rounded edge profile along at least the length dimension, and wherein the plurality of wood particles maintains a water absorptive property that permits water to be retained by the plurality of wood particles and released over time to disperse heat from the infill material.
2. The infill material of claim 1 wherein the plurality of wood particles are formed from at least one of a heartwood or sapwood component of a hardwood or a softwood species and having width to thickness dimensions in a range of about (0.5mm to 5mm) x (0.5mm to 5mm) defining a cross section and the length dimension in a range from about 1mm to about 5mm.
3. The infill material of claim 2 wherein the wood particles have a hardness measured on a Janka scale within a range of from about 500 to about 2500.
4. The infill material of claim 1 further including sand wherein the plurality of wood particles and the sand forms a weight ratio of sand to wood particles in at least one of a range of about 1:1 to about 10:1.
5. The infill material of claim 1 further including sand wherein the plurality of wood particles and the sand are combined as a mixture, the mixture configured to be deposited onto an artificial turf carpet.
6. The infill material of claim 4 wherein the wood particle length is between greater than 3mm and less than 7mm and the aspect ratio is between 3:1 to 7:1.
7. The infill material of claim 4 wherein the wood particle length is between greater than 1mm and less than 5mm and the aspect ratio is between 1:1 and 5:1.
8. The infill material of claim 1 further including sand and wherein the plurality of wood particles are combined with wood entanglement particles having at least one of a cross sectional area of about 0.25 square millimeter or a length to width ratio within the range of from about 10:1 to about 50:1 and wherein the sand has an average grain diameter in a range of about 0.5mm to about 2.5mm.
9. The infill material of claim 1 wherein the plurality of wood particles are coated in glycerin to provide an unabrasive tactile perception to the plurality of wood particles exhibiting angular edges.
10. The infill material of claim 1 wherein the plurality of wood particles are combined with a resilient material.
11. The infill material of claim 10 wherein the resilient material is one of styrene-butadiene rubber, thermoplastic elastomer, ethylene propylene diene monomer, or cork.
12. The infill material of claim 1 wherein the generally rounded edge profile is a mechanically abraded, deburred edge.
13. The infill material of claim 12 wherein the wood particles having the mechanically abraded, deburred edge are substantially ellipsoid shaped or substantially spherical shaped wood particles having generally smooth outer surfaces.
14. The infill material of claim 12 wherein the plurality of wood particles are applied to a turf carpet of an artificial ornamental lawn.
15. An artificial turf assembly comprising: a turf carpet having a plurality of spaced apart synthetic grass blades; and an infill material dispersed onto the turf carpet between the grass blades, the infill material including sand and a plurality of wood particles, the plurality of wood particles defining a length dimension greater than a width or a thickness dimension, the length dimension being oriented generally parallel to a grain structure of the wood particles, the length dimension being in a range of about 1mm to about 10mm, the length and one of the width or thickness dimensions defining an aspect ratio within a range of 1:2 to 10:1, wherein the plurality of wood particles have substantially deburred edges along at least the length dimension providing a generally rounded edge profile, and wherein the plurality of wood particles maintains a water absorptive property that permits water to be retained by the infill material and released over time to disperse heat.
16. The artificial turf assembly of claim 15 wherein the turf carpet includes a backing layer to which the spaced apart synthetic grass blades are attached, the infill material being dispersed onto the turf carpet in layers wherein a first layer is formed from the sand in a depth range of about 5mm to about 25mm and a second layer is dispersed over the first layer and comprising the plurality of wood particles in a depth range of about 5mm to about 25mm.
17. The artificial turf assembly of claim 15 including an underlayment layer.
18. The artificial turf assembly of claim 17 wherein the infill material defines a first spring rate of the artificial turf assembly and the underlayment layer defines a second spring rate that is lower in magnitude than the first spring rate such that loads applied to the artificial turf assembly are substantially transferred to the underlayment layer and the second spring rate provides a majority of a reactionary response load back through the artificial turf assembly against the applied load.
19. The artificial turf assembly of claim 17 wherein the underlayment layer is composed of one or more of extruded crosslinked polyethylene foam, extruded non- crosslinked polyethylene foam, ground and thermally bonded pieces of crosslinked polyethylene foam, heat bonded non-crosslinked polyethylene foam, or ground rubber particles.
20. The artificial turf assembly of claim 17 wherein the underlayment layer is a molded plastic grid including a lattice network formed by beam elements and supported by column elements, at least one of the beam elements or column elements are flexible to provide a resiliency characteristic to the underlayment layer.
21. The artificial turf assembly of claim 18 wherein the underlayment layer is one of an expanded polyethylene or polypropylene foam board material having a core and a plurality of projections extending from the core and in contact with a backing layer of the turf carpet, the plurality of projections defining the second spring rate and the core defining a third spring rate that is greater than the second spring rate and equal to or less than the first spring rate.
22. The artificial turf assembly of claim 18 wherein the wood particle length is between greater than 3mm and less than 7mm and the aspect ratio is between 3:1 to 7:1, and wherein a weight ratio of sand to wood particle is between 2:1 and 4:1.
23. The artificial turf assembly of claim 18 wherein the wood particle length is between greater than 0.5mm and less than 5mm and the aspect ratio is between 1:1 to 5:1, and wherein a weight ratio of sand to wood particle is between 4:1 and 8:1.
24. An artificial turf system comprising: a turf carpet having a plurality of spaced apart synthetic grass blades attached to a backing layer; an underlayment layer at least partially formed from expanded polyethylene or polypropylene bead material having a density in a range of 20-90 g/l; and an infill material dispersed onto the turf carpet between the grass blades, the infill material including sand and a plurality of wood particles, the plurality of wood particles defining a length dimension greater than a width or a thickness dimension, the length dimension being oriented generally parallel to a grain structure of the wood particles, the length dimension in a range of about 1mm to about 10mm, the length and one of the width or thickness dimensions defining an aspect ratio within a range of 1:2 to 10:1, and wherein the plurality of wood particles maintains a water absorptive property that permits water to be retained by the plurality of wood particles and released over time to disperse heat from the infill material.
25. The artificial turf system of claim 24 wherein the plurality of wood particles have substantially deburred edges along at least the length dimension providing a generally rounded edge profile.
26. The artificial turf system of claim 24 wherein the turf carpet and infill material disposed onto the turf carpet define a first spring rate and the underlayment layer defines a second spring rate that is more compliant than the first spring rate.
27. The artificial turf system of claim 26 wherein the second spring rate of the underlayment layer is associated with a deflection control layer and the underlayment layer further defines a third spring rate associated with a core section, such that the first spring rate is stiffer than the third spring rate and the third spring rate is stiffer than the second spring rate.
28. The artificial turf system of claim 24 wherein the underlayment layer includes a plurality of projections disposed across an upper support surface of the underlayment in contact with the turf carpet. J>CT/US
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201762478254P | 2017-03-29 | 2017-03-29 | |
| US201762529543P | 2017-07-07 | 2017-07-07 | |
| US201862616858P | 2018-01-12 | 2018-01-12 | |
| NZ757782A NZ757782B2 (en) | 2018-03-29 | Infill for artificial turf system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ798427A NZ798427A (en) | 2023-11-24 |
| NZ798427B2 true NZ798427B2 (en) | 2024-02-27 |
Family
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