EP2681361A1 - Process to produce loose infill material - Google Patents
Process to produce loose infill materialInfo
- Publication number
- EP2681361A1 EP2681361A1 EP12712741.3A EP12712741A EP2681361A1 EP 2681361 A1 EP2681361 A1 EP 2681361A1 EP 12712741 A EP12712741 A EP 12712741A EP 2681361 A1 EP2681361 A1 EP 2681361A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- granules
- granule
- stretching
- infill material
- process according
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 title claims abstract description 14
- 239000008187 granular material Substances 0.000 claims abstract description 44
- 229920001971 elastomer Polymers 0.000 claims abstract description 7
- 239000012530 fluid Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 3
- 238000009877 rendering Methods 0.000 abstract 1
- 244000025254 Cannabis sativa Species 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 244000060011 Cocos nucifera Species 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
- B29B17/0404—Disintegrating plastics, e.g. by milling to powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/16—Auxiliary treatment of granules
- B29B2009/166—Deforming granules to give a special form, e.g. spheroidizing, rounding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2030/00—Pneumatic or solid tyres or parts thereof
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- the invention relates to a loose infill material, ideal for example as a filler material of artificial grass on synthetic playing fields, to a process for producing it and to a machine suitable for performing the process.
- the artificial grass 10 of the playing field - see also US 4 735 825 - is usually formed as in fig. 1.
- an elastic/draining synthetic base under-turf 14 is laid which artificial grass with threads 20 is laid on.
- ballast for the grass it is covered with a layer of silica sand 16.
- performance infill a layer of various organic (coconut fibres, turf etc) and/or synthetic (rubber granules) and/or thermoplastic materials.
- tyres One infill material widely used on account of the fact that it does not rot and absorbs impact well is the granular rubber made for example by milling used tyres.
- the tyre is normally reduced to granules of a maximum dimension of 0.8-2.5 mm, coloured green for example and then spread over the synthetic playing field.
- the main objective of the invention is to reduce the cost of the filler material, in particular of the performance infill, even more particularly of the granular material.
- a further purpose is to improve the capacity of the filler material to absorb impact, increasing the comfort and/or safety of the user.
- the invention also relates to a machine which performs the method and produces the material, defined in claim 6.
- Fig. 1 shows a cross section of a known synthetic playing field
- Fig. 2 shows a granule
- Fig. 3 schematically shows the processing of the granule
- Fig. 4 shows the granule obtained by the process
- Fig. 5 schematically shows the working members of a granule producing machine.
- the process which the invention relates to is used to produce filler material starting from synthetic granules.
- rubber granular material made by mincing old tyres (a material otherwise disposed of as waste) is preferred.
- the rubber to be processed or synthetic starting material may be of different origin.
- a starting granule 30 is shown in fig. 2, and usually has maximum dimensions of 2.5 - 4 mm. The invention may however be applied to granules of other dimensions.
- the granule 30 is stretched - see fig. 3- on opposite sides with different tangential velocities, indicated as Fl and F2. As a result the granule 30 changes shape: it becomes longer and expands, and acquires an "open" shape as shown in fig. 4 by reference numeral 20.
- the granule 40 is the same weight but has a greater volume so that for the same cost a larger playing area may be filled.
- the expanded structure of the granule 40 confers significant and greater shock absorbent properties, giving the infill surface excellent play ability and dynamic response.
- the speeds Fl, F2 may be equiverse or in opposite directions, it being sufficient to apply to the granule 30 friction forces tending to elongate /stretch it.
- the expansion effect of the granule 30 is accentuated if, before or during stretching, its surface is incised, for example with cuts 32. This option has proved very advantageous because the final volume of the granule 40 is even greater with even greater impact absorption properties.
- One advantageous variant has proved to be spraying or atomizing a fluid, such as water, on the granule 30 to remove heat.
- a preferred embodiment of the machine producing the granule 40 comprises moving members adapted to stretch opposite sides of the granules with different tangential velocities.
- the machine is schematically shown in Fig. 5 and may comprise, for example, as moving members, two rotating cylinders 50, 52, rotating on parallel axes to rotate with equal angular velocities and having different diameters.
- the granules 30 are made to pass between the cylinders 50, 52.
- the step of cutting the granule is combined with the stretching step and non-smooth cylinders with a ridged surface or in general such as to mechanically act on the granule 30 so as to cause surface cracks or defects, are used.
- the granules are thereby cooled during the phase of maximum stress and heat generation.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Tires In General (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
To improve the features of infill material (40) made from rubber granules (30), preferably recycled, a process is described characterized by stretching opposite sides of the granules with different tangential velocities (F2, F2). The shape of the granule is modified, rendering it expanded.
Description
PROCESS to PRODUCE LOOSE INFILL MATERIAL
The invention relates to a loose infill material, ideal for example as a filler material of artificial grass on synthetic playing fields, to a process for producing it and to a machine suitable for performing the process.
The artificial grass 10 of the playing field - see also US 4 735 825 - is usually formed as in fig. 1. On a suitably prepared laying surface 12 an elastic/draining synthetic base under-turf 14 is laid which artificial grass with threads 20 is laid on. As ballast for the grass it is covered with a layer of silica sand 16.
To prevent the sand 16 from causing abrasions to the players, it is covered with what is called "performance infill", a layer of various organic (coconut fibres, turf etc) and/or synthetic (rubber granules) and/or thermoplastic materials.
One infill material widely used on account of the fact that it does not rot and absorbs impact well is the granular rubber made for example by milling used tyres. The tyre is normally reduced to granules of a maximum dimension of 0.8-2.5 mm, coloured green for example and then spread over the synthetic playing field.
The main objective of the invention is to reduce the cost of the filler material, in particular of the performance infill, even more particularly of the granular material. A further purpose is to improve the capacity of the filler material to absorb impact, increasing the comfort and/or safety of the user.
These objectives are achieved by a process according to claim 1. The invention also relates to a machine which performs the method and produces the material, defined in claim 6.
The advantages of the invention will be evident from the following description of a preferred embodiment of the process and the machine, with reference to the appended drawings wherein:
Fig. 1 shows a cross section of a known synthetic playing field;
Fig. 2 shows a granule;
Fig. 3 schematically shows the processing of the granule;
Fig. 4 shows the granule obtained by the process,
Fig. 5 schematically shows the working members of a granule producing machine.
The process which the invention relates to is used to produce filler material starting from synthetic granules. In a green-economy perspective of recycling highly pollutant materials, rubber granular material made by mincing old tyres (a material otherwise disposed of as waste) is preferred. Obviously, the rubber to be processed or synthetic starting material may be of different origin.
A starting granule 30 is shown in fig. 2, and usually has maximum dimensions of 2.5 - 4 mm. The invention may however be applied to granules of other dimensions.
The granule 30 is stretched - see fig. 3- on opposite sides with different tangential velocities, indicated as Fl and F2. As a result the granule 30 changes shape: it becomes longer and expands, and acquires an "open" shape as shown in fig. 4 by reference numeral 20.
Compared to the granule 30 the granule 40 is the same weight but has a greater volume so that for the same cost a larger playing area may be filled. The expanded structure of the granule 40 confers significant and greater shock absorbent properties, giving the infill surface excellent play ability and dynamic response.
The speeds Fl, F2 may be equiverse or in opposite directions, it being sufficient to apply to the granule 30 friction forces tending to elongate /stretch it.
The expansion effect of the granule 30 is accentuated if, before or during stretching, its surface is incised, for example with cuts 32. This option has proved very advantageous because the final volume of the granule 40 is even greater with even greater impact absorption properties.
By way of precaution it is preferred to cool the granule 30 before and/or during stretching. If the granule 30 is rubber, its stretching may result in sufficient overheating to cause fires. One advantageous variant has proved to be spraying or atomizing a fluid, such as water, on the granule 30 to remove heat.
A preferred embodiment of the machine producing the granule 40 comprises moving members adapted to stretch opposite sides of the granules with different tangential velocities. The machine is schematically shown in Fig. 5 and may comprise, for example, as moving members, two rotating cylinders 50, 52, rotating on parallel axes to rotate with equal angular velocities and having different diameters. The granules 30 are made to pass between the cylinders 50, 52.
Preferably the step of cutting the granule is combined with the stretching step and non-smooth cylinders with a ridged surface or in general such as to mechanically act on the granule 30 so as to cause surface cracks or defects, are used.
It is preferred to fit the machine with means of cooling the granules to avoid, as said, the risk of spontaneous combustion. Among the various options, it has been found simple in terms of construction and highly efficient to fit the machine with:
• means 56 (such as nozzles) for spraying or atomizing a fluid 54 on the granules to remove heat from them, and/or
• hollow cylinders inside which water or coolant liquid is made to circulate,.
The granules are thereby cooled during the phase of maximum stress and heat generation.
Claims
1. Process to produce loose infill material (40) from rubber granules (30), preferably recycled, characterized by stretching opposite sides of the granules with different tangential velocities (F2, F2).
2. Process according to claim 1, wherein the velocities are equiverse or opposite.
3. Process according to claim 1 or 2, wherein during the stretching the surface of a granule is cut (32).
4. Process according to one of the preceding claims, wherein during the stretching the granule is cooled.
5. Process according to claim 4, wherein a fluid is sprayed or atomized over the granules to remove heat.
6. Machine to produce loose infill material (40) starting from rubber granules (30) preferably recycled, characterized in that it comprises moving members (50, 52) adapted to stretch the opposite sides of the granules with different tangential velocities (F1, F2).
7. Machine according to claim 6, comprising two rotating cylinders (50, 52) between which the granules (30) are passed to be stretched.
8. Machine according to claim 7, wherein the two cylinders are adapted to rotate with equal angular velocities and have different diameters.
9. Machine according to one of claims 5 to 8, wherein the surface of the moving members which is in contact with the granules comprises rises or shaped parts adapted to cause cuts or surface cracks on the granule (32).
10. Machine according to one of the claims 5 to 9, comprising means (56) for spraying or atomizing a fluid on the granules to remove heat.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT000031A ITTV20110031A1 (en) | 2011-03-02 | 2011-03-02 | PROCESS AND MACHINE TO PRODUCE MATERIAL LOOSE BY INTASO |
| PCT/IB2012/050941 WO2012117358A1 (en) | 2011-03-02 | 2012-02-29 | Process to produce loose infill material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2681361A1 true EP2681361A1 (en) | 2014-01-08 |
Family
ID=43977527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12712741.3A Withdrawn EP2681361A1 (en) | 2011-03-02 | 2012-02-29 | Process to produce loose infill material |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2681361A1 (en) |
| IT (1) | ITTV20110031A1 (en) |
| WO (1) | WO2012117358A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7296988B2 (en) * | 2018-05-09 | 2023-06-23 | マー．プロジェクト エス．アール．エル | Infill material for synthetic turf and synthetic turf obtained therefrom |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2315587B2 (en) * | 1972-08-14 | 1975-04-10 | Kobe Steel, Ltd., Kobe (Japan) | Device for fine grinding of rubber |
| US4337283A (en) * | 1980-09-11 | 1982-06-29 | Haas Jr Frederick T | Synthetic turf playing surface with resilient top-dressing |
| DE3409361A1 (en) | 1984-03-14 | 1985-09-19 | J.F. Adolff Ag, 7150 Backnang | ARTIFICIAL LAWN |
| DE3444541A1 (en) * | 1984-12-06 | 1986-06-19 | Institut chimičeskoj fiziki Akademii Nauk SSSR, Moskau/Moskva | Process for producing powder from rubber and its vulcanisation products |
| US4813614A (en) * | 1987-08-10 | 1989-03-21 | Moore David R | Method and apparatus for treating waste products to recover the components thereof |
| DE4033247A1 (en) * | 1990-10-19 | 1992-04-23 | Continental Ag | Toothed rollers for processing e.g. rubber - have two different diameters with smaller roller offset from vertically above the larger, and rubber bales are fed in on inclined conveyor |
-
2011
- 2011-03-02 IT IT000031A patent/ITTV20110031A1/en unknown
-
2012
- 2012-02-29 WO PCT/IB2012/050941 patent/WO2012117358A1/en not_active Ceased
- 2012-02-29 EP EP12712741.3A patent/EP2681361A1/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012117358A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ITTV20110031A1 (en) | 2012-09-03 |
| WO2012117358A1 (en) | 2012-09-07 |
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Legal Events
| Date | Code | Title | Description |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| 17P | Request for examination filed |
Effective date: 20130927 |
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| DAX | Request for extension of the european patent (deleted) | ||
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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| INTG | Intention to grant announced |
Effective date: 20141002 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 18D | Application deemed to be withdrawn |
Effective date: 20150213 |