EP3791019B1 - Infill material for synthetic turfs and synthetic turfs so obtained - Google Patents

Infill material for synthetic turfs and synthetic turfs so obtained Download PDF

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Publication number
EP3791019B1
EP3791019B1 EP18743873.4A EP18743873A EP3791019B1 EP 3791019 B1 EP3791019 B1 EP 3791019B1 EP 18743873 A EP18743873 A EP 18743873A EP 3791019 B1 EP3791019 B1 EP 3791019B1
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EP
European Patent Office
Prior art keywords
infill
synthetic
rachis
per unit
surface area
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EP18743873.4A
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German (de)
English (en)
French (fr)
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EP3791019A1 (en
EP3791019C0 (en
Inventor
Marina NUSCA
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Mar Project SRL
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Mar Project SRL
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Publication of EP3791019C0 publication Critical patent/EP3791019C0/en
Publication of EP3791019B1 publication Critical patent/EP3791019B1/en
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    • 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

Definitions

  • the present invention relates to infill materials for synthetic turfs and to synthetic turfs obtained by using such infill materials.
  • the invention furthermore, relates to a method for making such synthetic turfs.
  • a synthetic turf essentially consists of a mat made of plastic material to which blades of synthetic material, also called “bristles”, are fixed in such a way to form a synthetic turf.
  • the blades made of synthetic material are knitted to the mat by means of known processes that allow to obtain a warp of blades, which are close to each other according to the needs.
  • an infill material is distributed, also simply called "infill”. This is, usually, granular-shaped, and is selected both according to the kind of sport to which the synthetic turf is destined, for example soccer, hockey, cricket, rugby, but also according to the weather conditions that are more frequent where the synthetic turf is installed.
  • the infill material provides a draining action by adjusting the drainage of rainwater or of irrigation water, protects the mat assuring to the synthetic turf a high duration, and especially gives to the turf mechanical, physical and technological features typical of the natural turf.
  • an infill material is, in particular, the elasticity of the ground for the user, the rebound of the ball, the capacity of absorption of the hits when falling down, tensile and torque resistance to the force caused by the shoe, the resistance against the compression, to the penetration of external bodies, as well as the capacity of absorption and drainage of water in case of meteorological and environmental events.
  • the drainage action of the synthetic turf is, usually, carried out by a base portion, or "stabilizing infill", essentially constituted of sand. Instead, the elasticity of the synthetic turf is, usually, guaranteed by the presence of granules of rubber that are concentrated in the upper portion of the turf, or "performance infill”.
  • stabilizing infill essentially constituted of sand.
  • performance infill An example of a similar infill material is disclosed in US2002/081399 .
  • An infill material according to the preamble of independent claim 1 is disclosed in WO 2014/049531 A2 .
  • the synthetic turfs of known type containing rubber and sand have many drawbacks. Firstly, owing to the compression caused by trampling, or by settling of the drainage water percolation, eventually the layer of sand tends to become compacted thus losing its drainage properties. Therefore, in particular in case of abundant rainfall, the synthetic turf is not able to drain away the rain water and is subjected to flooding. This causes a random and turbulent mixture of the infill material, in particular at the upper layers of the same, that is, therefore, shifted from the correct position within the infill. In particular, the infill material, in the time, provides zones where the material dragged by water concentrates, and other zones, instead, completely, or however impoverished of the same material. Therefore, the synthetic turf loses its original structure and, accordingly, the physical, mechanical and drainage features that it had at the moment of laying.
  • an object of the present invention to provide an infill material for synthetic turfs that is able to perform an effective drainage of water.
  • an infill material for synthetic turfs comprising:
  • rachis of cereal ear in the stabilizing infill allows to avoid the above mentioned drawbacks of synthetic turfs of prior art.
  • the material constituted of rachis of cereal ear preferably corn-cob of maize, has, in particular, the property of absorbing high quantity of water "swelling", and then of releasing, in the drier and hotter seasons, the absorbed moisture in the surrounding environment. Consequently, the rachis of cereal ear acts as a "lung" for the synthetic turf, which incorporates it, because, as anticipated above, it absorbs the water, or the moisture, in excess, increasing its volume, and then gradually reducing it by releasing the moisture, when the climatic conditions return drier and the ambient temperature increases.
  • the rachis of cereal ear provides, in fact, a high porosity and is subjected to alternating cycles of expansion, and of compression, or in any case of reduction of volume. Therefore, the whole infill material, and in particular the performance infill, is subjected to a decompacting action that allows to keep the infill material tilled, and preserving substantially intact in the time the physical properties of the infill.
  • the material constituted of rachis of cereal ear, in particular corn-cob is able to absorb a high quantity of moisture, for example during rain and irrigation interventions, and, then, to release the above mentioned moisture in the hotter seasons, thus obtaining a thermal balance of the turf.
  • corn-cob has a water absorption capacity that is about 138%. Such properties avoid excessive heating of the performance infill, in particular of the above mentioned plastic material having elastomeric properties, during the hotter seasons.
  • the stabilizing infill furthermore, comprises a predetermined quantity per unit surface area of sand.
  • the stabilizing infill can provide a mixture of a predetermined percentage by volume of said vegetable material of rachis of cereal ear and a predetermined percentage by volume of sand.
  • the mixture of vegetable material of rachis of cereal ear and sand has the following composition:
  • the infill material can comprise a predetermined quantity per unit surface area of the above mentioned mixture, said predetermined quantity per unit surface area being set between 2.5 kg/m 2 and 15 kg/m 2 .
  • the vegetable material constituted of rachis of cereal ear is corn-cob, i.e. rachis of maize.
  • corn-cob i.e. the rachis of maize
  • the stabilizing infill of the infill material can comprise:
  • the first layer can be constituted of a predetermined quantity per unit surface area of sand, said predetermined quantity being set between 10 kg/m 2 and 25 kg/m 2 .
  • the second layer can be constituted of a predetermined quantity per unit surface area of the above mentioned vegetable material of rachis of cereal ear, said predetermined quantity per unit surface area being set between 2 kg/m 2 and 5 kg/m 2 .
  • the above mentioned plastic material having elastomeric properties in granular form of the performance infill is selected from the group consisting of: styrene-butadiene rubber, or "SBR", a thermoplastic material, an ethylene-propylene-diene monomer, or rubber "EPDM”, polyvinyl chloride, or "PVC”, a synthetic organic material, or a combination thereof.
  • SBR styrene-butadiene rubber
  • EPDM polyvinyl chloride
  • PVC synthetic organic material
  • the above mentioned synthetic organic material is a mixture of a plastic material with elastomeric properties, and an organic material of vegetable origin, preferably selected from the group comprised of coconut and cellulose.
  • the vegetable material constituted of rachis of cereal ear, in particular corn-cob has a granulometry set between 0.3 mm and 5.0 mm.
  • sand a material having a mineralogical composition, for example siliceous sand, sand of pumice, sand of lapillus, zeolite, vermiculite, etc.
  • the performance infill can be constituted of only vegetable material of rachis of cereal ear in a predetermined quantity per unit surface area set between 2 kg/m 2 and 8 kg/m 2 .
  • the predetermined quantity per unit surface area of polymeric material with elastomeric properties in granular form, of the infill material is set between 8 kg/m 2 and 18 kg/m 2 .
  • a synthetic turf comprises:
  • a method for making a synthetic turf comprises the steps of:
  • the blades made of synthetic material can comprise smooth blades, or wavy blades, or smooth blades alternating to wavy blades.
  • the mat can provide a plurality of holes arranged to put in communication said first face and said second face, in such a way to allow the water to flow under the mat.
  • a synthetic turf 1 comprises a mat 2, which provides a face 2a, which, in use, is arranged adjacent to the surface to be coated, and a face 2b opposite to face 2a.
  • the synthetic turf 1 comprises, furthermore, a plurality of blades, or bristles, 3 made of synthetic material that are fixed to mat 2, for example by means of gluing, or stitching.
  • Above the face 2b of mat 2 is, furthermore, present an infill material 10 arranged all around the blades 3 made of synthetic material.
  • the infill material 10 provides a lower portion, or stabilizing infill 11, and an upper portion, or performance infill 12 positioned above the stabilizing infill 11.
  • the performance infill 12 is essentially constituted of a plastic material having elastomeric properties, preferably selected between styrene-butadiene rubber, or "SBR", a thermoplastic material, an ethylene-propylene-diene monomer, or "EPDM” rubber, polyvinyl chloride, or "PVC", a synthetic organic material, or a combination thereof.
  • the above mentioned synthetic organic material can be a mixture of a plastic material having elastomeric properties, and of an organic material of vegetable origin, preferably selected between coconut and cellulose, or a combination thereof.
  • the above mentioned mixture is appropriately extruded in order to obtain granules of the above mentioned synthetic organic material.
  • the above mentioned plastic material having elastomeric properties in granular form can be of black colour, or of a different colour, or can provide a mixture of two, or more colours.
  • the stabilizing infill 11 comprises a vegetable material of rachis of cereal ear not coated of a film, or layer, of coating material, in a predetermined quantity per unit surface area.
  • the above mentioned predetermined quantity per unit surface area of the above mentioned vegetable material of rachis of cereal ear is set between 2 kg/m 2 and 15 kg/m 2 , in function of the height of the synthetic grass.
  • the cereal can be maize and, therefore, the rachis of cereal ear is "corn-cob".
  • the vegetable material of rachis of cereal ear is not coated with a film of coating material in order to be able to absorb and to release moisture and, therefore, to alternate the above mentioned cycles of increasing and of reduction of volume that, as above disclosed, are fundamental in order to avoid an excessive heating of the material of which the performance infill is constituted.
  • the stabilizing infill 11 provides a single layer constituted only of vegetable material of rachis of cereal ear.
  • a distribution step is advantageously provides of a predetermined quantity per unit surface area of the stabilizing infill set between 2 kg/m 2 and 8 kg/m 2 on the above mentioned mat 2.
  • the material of rachis of cereal ear carries out an auto-decompacting action that allows to keep the stabilizing infill tilled, and of preserving substantially intact in the time, the physical features, in particular the drainage capacity.
  • the stabilizing infill 11 provides, instead, a lower layer 11a of sand, above of which is positioned a layer 11b of the above mentioned material of rachis of cereal ear, preferably corn-cob.
  • the above mentioned predetermined quantity per unit surface area of sand of the stabilizing infill will be mainly concentrated, in this case, in the first layer, i.e. in the lower layer 11a, whilst the above mentioned predetermined quantity per unit surface area of vegetable material constituted of rachis of cereal ear will be mainly concentrated in the second layer, i.e. the upper layer 11b.
  • the material of rachis of cereal ear prevents the sand layer 11a and, therefore, the whole stabilizing infill 11 and, therefore, the synthetic turf, from being compacted.
  • the first layer 11a is constituted of a predetermined quantity per unit surface area of sand set between 10 kg/m 2 and 25 kg/m 2 .
  • the second layer is, instead, constituted of a predetermined quantity per unit surface area of the above mentioned vegetable material of rachis of cereal ear set between 2 kg/m 2 and 5 kg/m 2 .
  • the infill material 10 provides for the stabilizing infill 11 a single layer constituted, in this case, of a mixture of sand and the above mentioned material of vegetable constituted of rachis of cereal ear.
  • the above mentioned mixture of vegetable material of rachis of cereal ear and sand is constituted for a percentage by volume set between 25% and 90% of material of rachis of cereal ear, and for a percentage by volume set between 10% and 75% of sand.
  • the predetermined quantity per unit surface area of the mixture of vegetable material of rachis of cereal ear and sand is set between 2.5 kg/m 2 and 15 kg/m 2 .
  • the combined use of sand and vegetable material of rachis of cereal ear allows to obtain a highly draining synthetic turf and, thanks to the properties of the vegetable material of rachis of cereal ear, to avoid that the sand, which is present in the stabilizing infill, can be compacted and, therefore, that the synthetic turf following to the irrigation, or to the rain, can flood.
  • the presence of vegetable material of rachis of cereal ear guarantees that, in the time, the effectiveness of the drainage action of the sand layer is maintained.
  • the blades, or bristles, 3 of synthetic material provide an upper portion protruding of a determined height from the upper surface 10b of the infill material, for example protruding of about 2-10 cm.
  • the mat, or support, 2 can provide drainage holes 4, having sizes such that they allow the outflow of the percolated water obtained by the drainage action of the stabilizing infill 11.
  • a sack 100 is shown, by way of example, containing a predetermined quantity of a mixture 20 of sand and vegetable material of rachis of cereal ear in the above disclosed percentage by volumes.
  • the mixture 20 is substantially "homogeneous" in the sense that the granules of the two components, that is to say of sand and of vegetable material of rachis of cereal ear, are dispersed one in the other such that it is not easily visible to the naked eye.
  • the mixture 20 can be used, in particular, for obtaining the embodiment of infill material 10 of the synthetic turf of figure 3 .

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
  • Cultivation Of Plants (AREA)
EP18743873.4A 2018-05-09 2018-05-09 Infill material for synthetic turfs and synthetic turfs so obtained Active EP3791019B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2018/000067 WO2019215768A1 (en) 2018-05-09 2018-05-09 Infill material for synthetic turfs and synthetic turfs so obtained

Publications (3)

Publication Number Publication Date
EP3791019A1 EP3791019A1 (en) 2021-03-17
EP3791019C0 EP3791019C0 (en) 2023-07-05
EP3791019B1 true EP3791019B1 (en) 2023-07-05

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EP18743873.4A Active EP3791019B1 (en) 2018-05-09 2018-05-09 Infill material for synthetic turfs and synthetic turfs so obtained

Country Status (6)

Country Link
EP (1) EP3791019B1 (ja)
JP (1) JP7296988B2 (ja)
CN (1) CN112189068A (ja)
CA (1) CA3099390A1 (ja)
EA (1) EA202092625A1 (ja)
WO (1) WO2019215768A1 (ja)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018132650A1 (en) * 2017-01-12 2018-07-19 The Toro Company Mobile turf instrument apparatus
EP4220054A1 (en) * 2022-01-28 2023-08-02 Sue - Sports Unified Europe, Lda Process for production of an infill material for a synthetic turf surface
WO2023144621A1 (en) * 2022-01-28 2023-08-03 Sue - Sports Unified Europe, Lda Process for production of an infill material for a synthetic turf surface
US20240159000A1 (en) * 2022-11-11 2024-05-16 Tarkett Sports Canada Inc. Corn cob based infill material for synthetic turf fields
WO2024125947A1 (en) * 2022-12-16 2024-06-20 Astroturf Corporation Artificial turf with shielded water absorber layer
US20240200282A1 (en) * 2022-12-16 2024-06-20 Astro Turf Corporation Artificial turf with shielded water absorber layer

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4559367A (en) * 1985-04-12 1985-12-17 The Dow Chemical Company Combination blowing agent and filler for thermoplastic foams
WO2002050376A1 (en) * 2000-12-21 2002-06-27 Fieldturf Inc. Synthetic grass sport surfaces
JP4540122B2 (ja) 2006-12-18 2010-09-08 住友ゴム工業株式会社 人工芝および人工芝を敷設してなる人工芝構造体
CN101835931B (zh) * 2007-08-24 2013-04-03 卡德-门罗公司 形成人造/合成运动草皮织物的系统和方法
WO2009118388A1 (en) * 2008-03-27 2009-10-01 Dsm Ip Assets B.V. Polymer granules suitable as infill material for artificial turf structures
IT1394937B1 (it) 2009-01-12 2012-07-27 Mondo Spa Procedimento per realizzare materiale di riempimento per manti erbosi sintetici, corrispondente materiale e relativo manto erboso sintetico
IT1395627B1 (it) 2009-08-27 2012-10-16 Nusca Materiale di intasamento per manti in erba sintetica e manti in erba sintetica cosi' ottenuti
CN102725450A (zh) 2009-10-30 2012-10-10 马尔工程公司 混合草皮及其制造方法
JP5417129B2 (ja) 2009-11-19 2014-02-12 積水樹脂株式会社 人工芝生
ITTV20110031A1 (it) 2011-03-02 2012-09-03 Graneco Rubber S R L Processo e macchina per produrre materiale sciolto da intaso
JP5918960B2 (ja) 2011-10-03 2016-05-18 住友ゴム工業株式会社 人工芝構造体
ITPI20120099A1 (it) * 2012-09-28 2014-03-29 Mar Project S R L Materiale di intasamento perfezionato per manti in erba sintetica e manti ibridi sintetico-naturale e manti cosi' ottenuti
US20180080183A1 (en) * 2016-09-20 2018-03-22 Tarkett Inc. Organic infill for artificial turf fields
CN107805655B (zh) * 2017-11-10 2020-08-11 中国科学院青岛生物能源与过程研究所 一种橘色藻人工草皮及其耦合铵氮污水处理和类胡萝卜素生产的应用

Also Published As

Publication number Publication date
JP2021533285A (ja) 2021-12-02
EP3791019A1 (en) 2021-03-17
CA3099390A1 (en) 2019-11-14
WO2019215768A9 (en) 2020-01-02
JP7296988B2 (ja) 2023-06-23
CN112189068A (zh) 2021-01-05
EP3791019C0 (en) 2023-07-05
EA202092625A1 (ru) 2021-04-02
WO2019215768A1 (en) 2019-11-14

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