Turf infill separation system and method for separating a dry or dried infill
A separation system suitable for separating a dry or dried infill preferably including rubber and/or sand, into a plurality of fractions, the separation system includes a first screening means configured to receive a first set of separation screens said set of separation screens being configured to separate infill into a first plurality of fractions, wherein the separation system further includes a pre-analysis unit, a database and a processing unit configured to calculate correlation coefficients and/or deviation values between the first set of composition values and a plurality of second sets of composition values of the database; and a method for separating a dry or dried infill having a composition of materials, preferably including rubber and sand, into a plurality of fractions.
1 . A method for separating a dry or dried infill having a composition of materials, preferably comprising rubber and sand, into a plurality of fractions comprising the steps of:
i) providing a first dry or dried infill;
ii) separating infill from the first infill in a first screening means having a first set of separation screens into fractions such as to obtain a first set of composition values;
iii) replacing one or more separation screens in the first screening means by a separation screen with a different mesh size, the replacement of at least one separation screen only being carried out if at least one of the analysis fractions is not considered to have a high purity; and
iv) separating the first infill into a plurality of fractions in the first screening means; wherein the screen replacement takes place during operation, or during a short pause in the operation, of the first screening means.
2 . The method according to claim 1 , wherein the dry or dried infill is from an artificial turf product.
3 . The method according to claim 1 , wherein the infill is taken after a majority infill has been separated from an artificial turf product, the infill is taken directly from an intact artificial turf product, after the majority of the infill has been separated from the remainder of the artificial turf product, either before, during or and/or after drying of the infill.
4 . The method according to claim 1 , wherein the replacing one or more separation screens in the first screening means comprises the steps of:
comparing the first set of composition values of the dry or dried infill with a plurality of second sets of composition values of a database, each second set of composition values corresponding to a composition of materials and to a predetermined second set of separation screens, so as to obtain a correlation coefficient and/or deviation value between the first set of composition values and each of the plurality of second sets of composition values from the database;
selecting the at least first set of separation screens to be received by the at least first screening means by selecting a set of separation screens corresponding to a second set of composition values and having a correlation coefficient above a predetermined threshold and/or having a relatively low deviation value, preferably the lowest available deviation value, when compared to the first set of composition values; and
installing the selected first set of separation screens in the first screening means.
5 . The method according to claim 4 , further comprising:
separating one or more fractions of the separated plurality of fractions from the infill of the separating the infill into the plurality of fractions in a second screening means comprising a second set of separation screens different from the first set of separation screens in the first screening means, the second set of separation screens being selected on the basis of the selected set of separation screens from the database in the selecting the at least first set of separation screens to be received by the at least first screening means.
6 . The method according to claim 1 , wherein more than two screening means are separating a dry or dried infill into a plurality of fractions, each screening means comprising a different set of separation screens.
7 . The method according to claim 1 , wherein the set of separation screens comprises two separation screens, preferably three separation screens, more preferably four separation screens, each of the separation screens has a mesh size selected from but not limited to a mesh size of substantially 5.0 mm, 4.0 mm, 3.0 mm, 2.5 mm, 2.3 mm, 2.0 mm, 1.8 mm, 1.5 mm, 1.2 mm, 1.0 mm, 0.8 mm, 0.7 mm, 0.6 mm, 0.5 mm, 0.4 mm, 0.3 mm, and/or 0.2 mm.
8 . The method according to claim 4 , wherein the step of separation of the dry or dried infill into a plurality of fractions is performed in four screening means, each screening means comprising four separation screens on the basis of the selected set of separation screens from the database in the selecting the at least first set of separation screens to be received by the at least first screening means.
9 . The method according to claim 1 , wherein the step of separation results in fractions comprising one or more of coconut shell, fine sand, rough sand, graded sand, granulated styrene-butadiene rubber (SBR), crumb rubber, cork, organic infill, thermoplastic elastomers (TPE), thermoplastic olefins (TFO), neoprene rubber, fiberglass, polyethylene, polypropylene, nylon, or ethylene propylene diene monomers (EPDM).
10 . The method according to claim 1 , wherein the purity of at least one the fractions separated in the determining the relative content of each separated analysis fraction in relation to the total content of analyzed infill is analyzed in a pre-analysis unit or another analysis unit.