Infill material for synthetic turfs and synthetic turfs so obtained

Abstract

Synthetic turf (1) comprising a mat (2) equipped with a first face (2a), which in use is arranged next to a surface (50) to coat, and with a second face (2b) opposite to the first face (2a). The synthetic turf (1) comprises, furthermore, a plurality of filaments (3) knitted to the mat (2) and made of a synthetic material. Above the second face (2b) of the mat (2), furthermore, an infill material (10) is present that is arranged all around the filaments (3) of artificial material. The infill material (10) comprises, in particular at least one layer (15) consisting of a mixture of a predetermined amount of cereal husks, such as rice husks, husks of wheat, husks of rye, husks of oat, husks of spelt, or a combination thereof, and wood sawdust obtained by a raw material with high content of lignin, such as Teak sawdust, Mahogany sawdust, Iroko sawdust, or a combination thereof.

1 . Infill material for synthetic turfs comprising a natural vegetable material that is at the same time imputrescible and not attackable by bacteria,
 wherein said natural vegetable material comprises a defibrated arboreus material which is resistant to microbial digestion in a percent volume set between 40% and 95%.   
     
     
         2 . Infill material for synthetic turfs according to  claim 1  wherein said natural vegetable material comprises a defibrated arboreus material which is resistant to microbial digestion in a percent volume set between 65% and 85% v/v. 
     
     
         3 . Infill material for synthetic turfs according to  claim 1  wherein said defibrated arboreus material comprises the defibrated arboreus material which is resistant to microbial digestion is obtained by sawdust wood obtained by a raw material with high content of lignin, selected from the group consisting of:
 Teak sawdust; 
 Mahogany sawdust; 
 Iroko sawdust; 
 or a combination thereof. 
 
     
     
         4 . Infill material for synthetic turfs according to  claim 1  comprising a mixture of:
 a measured amount of wood sawdust obtained from a raw material with high content of lignin, and; 
 a measured amount of cereal husks. 
 
     
     
         5 . Infill material for synthetic turfs, according to  claim 4 , wherein said mixture furthermore comprises a measured amount of a loose product from raw material based on coconut coir. 
     
     
         6 . Infill material for synthetic turfs, according to  claim 4 , wherein said wood sawdust is obtained from the group comprised of:
 Teak sawdust;   Mahogany sawdust;   Iroko sawdust;   or a combination thereof.   
     
     
         7 . Infill material for synthetic turfs, according to  claim 4 , wherein said cereal husks comprise selected from the group comprised of:
 rice husks;   husks of wheat;   husks of rye;   husks of oat;   husks of spelt;   or a combination thereof.   
     
     
         8 . Infill material for synthetic turfs, according to  claim 4 , wherein said cereal husks comprise rice husks. 
     
     
         9 . Infill material for synthetic turfs, according to  claim 1 , wherein said cereal husks are present in said mixture in a percent volume set between 1% and 15%. 
     
     
         10 . Infill material for synthetic turfs, according to  claim 1 , wherein said cereal husks are present in said mixture in a percent volume set between 1% and 10%. 
     
     
         11 . Infill material for synthetic turfs, according to  claim 1 , wherein said mixture comprises, furthermore, a predetermined amount of a loose final product from raw material based on ground cork, in such a way that it is suitable for further improving the physical characteristics of said synthetic turf. 
     
     
         12 . Infill material for synthetic turfs, according to  claim 1 , wherein said mixture comprises, furthermore, a predetermined amount of sand. 
     
     
         13 . Infill material for synthetic turfs, according to  claim 1 , wherein said infill material comprises:
 a lower layer of sand;   an upper layer consisting of said mixture.   
     
     
         14 . Infill material for synthetic turfs, according to  claim 10 , wherein said layer of sand is present in a volume set between 5% and 60% with respect to the total volume of said infill material. 
     
     
         15 . Infill material for synthetic turfs, according to  claim 10  wherein said layer of sand is present in a volume set between 8% and 30% with respect to the total volume of the infill material. 
     
     
         16 . Infill material for synthetic turfs, according to  claim 9 , wherein said sand has a granulometry set between 0.4 mm and 2.0 mm. 
     
     
         17 . Infill material for synthetic turfs, according to  claim 1 , wherein the measured amount of wood sawdust is such that the percent volume of wood sawdust with respect to the total volume of the mixture is set between 40% and 95%. 
     
     
         18 . Infill material for synthetic turfs, according to  claim 1 , wherein the measured amount of wood sawdust in said mixture is such that the percent volume of wood sawdust with respect to the total volume of said mixture is set between 65% and 85%. 
     
     
         19 . Infill material for synthetic turfs, according to  claim 1 , wherein said mixture has the following composition:
 between about 1% to about 15% v/v of said cereal husks, in particular rice husks;   between about 20% and about 35% v/v of cork;   between about 55% and 80% of wood sawdust.   
     
     
         20 . Infill material for synthetic turfs, according to  claim 1 , wherein said mixture has the following composition:
 between about 1% and about 10% v/v of cereal husks, in particular rice husks;   between about 20% and about 25% v/v of cork, in particular ground cork;   between about 65% and 75% of wood sawdust.   
     
     
         21 . Infill material for synthetic turfs, according to  claim 1 , wherein said cereal husks have a moisture content set between 5% and 15%. 
     
     
         22 . Infill material for synthetic turfs, according to  claim 2 , wherein said loose final product from raw material based on coconut ground comprises the sole granular and fibrous part contained in the starting raw material based on coconut. 
     
     
         23 . Infill material for synthetic turfs, according to  claim 19 , wherein said granular and fibrous part contained in said loose product is obtained by sieving said raw material based on coconut coir. 
     
     
         24 . Infill material for synthetic turfs, according to  claim 19 , wherein said granular and fibrous part of coconut ground has a grain size larger than 500 micron (μm) for 90% by weight. 
     
     
         25 . Infill material for synthetic turfs, according to  claim 19 , wherein said granular and fibrous part has the following grain size:
 among 20% and 40% by weight set between 0.8 mm and 1.25 mm;   among 15% and 35% by weight set between 1.25 mm and 1.60 mm;   among 50% and 70% by weight larger than 1.6 mm.   
     
     
         26 . Infill material for synthetic turfs, according to  claim 8 , wherein said measured amount v/v of cork present in said mixture is set between 15% and 40% v/v. 
     
     
         27 . Infill material for synthetic turfs, according to  claim 8 , wherein said measured amount v/v of cork present in said mixture is set between 20% and 35% v/v. 
     
     
         28 . Synthetic turf for sports or recreational activities comprising:
 a mat equipped with a first face that is adapted to be arranged on a surface to coat and with a second face opposite to the first face;   a plurality of filaments of synthetic material knitted on said mat, said plurality of filaments of synthetic material protruding from said second side in order to form a turf;   an infill material for said turf;   characterized in that said infill material comprises a loose material of vegetable origin, said loose material of vegetable origin being a mixture of:   a measured amount of wood sawdust obtained from a raw material with high content of lignin; and;   a measured amount of cereal husks.   
     
     
         29 . Synthetic turf, according to  claim 25 , wherein said filaments of synthetic material knitted on said mat comprises:
 a first group of longer filaments, said first group of filaments protruding from said infill material;   a second group of shorter filaments, said second group of filaments arranged within the infill material without protruding from it, or protruding minimally from it.   
     
     
         30 . Synthetic turf, according to  claim 26 , wherein said filaments of said second group of filaments has a twisted shape in order to give higher support to the infill material. 
     
     
         31 . A method for making a synthetic turf comprising the steps of:
 preparing a turf comprising a mat to which a plurality of filaments of synthetic material is connected, said mat equipped with a first face that is adapted to be arranged on a surface to coat and with a second face opposite to the first face, said plurality of filaments of synthetic material protruding from said second face;   laying on said first face of said mat an infill material obtaining a synthetic turf;   characterized in that said infill material comprises a loose material of vegetable origin, said loose material of vegetable origin being a mixture of:   a measured amount of wood sawdust obtained from a raw material with high content of lignin;   a measured amount of cereal husks.   
     
     
         32 . Method for making a synthetic turf, according to  claim 28 , wherein said step of distributing said infill material comprises the steps of:
 distributing a layer of sand on said mat;   distributing a layer consisting of said mixture on said layer of sand.