![\"Artificial](\"https:\/\/www.podovi.org\/en\/wp-content\/uploads\/sites\/2\/2022\/08\/artificial-grass-turf-production-jpg-800x600.webp\")
<\/p>\nAmong many synthetic materials which exist nowadays in our surroundings, we often find
\nartificial grass.<\/p>\n
Economic justification for changing natural grass with artificial on sports fields is
\nindisputable. Natural grass, apart from expensive maintaining (watering, mowing, fertilising),
\nneeds rest and recovery from walking and running on. On the other hand, artificial grass can
\nbe used 24\/7 in all weather conditions. Players\u2019 safety and a comfortable game are guaranteed
\nas on the natural grass. The only drawback of artificial grass comparing it to the natural one is
\na higher warm-up during sunny days and a substantial heat emission during hot summer
\nmonths.<\/p>\n
Production technology of artificial grass is taken from carpet industry. Similar machines tuft
\ngreen strands for polypropylene foundation, and then the grass is cut to a certain height. The
\nback of the foundation is coated with layer of latex so that the threads of grass would not fall
\nout. On distance of 10-15cm, holes with diameter of 4mm are drilled and they serve for water
\nflow if grass is under the open sky. The grass is in rolls wide 4m in diameter. The length of
\nthe rolls can be ordered at the factory, and according to a previously set field plan, during the
\nproduction white or yellow lines can be weaved in. The most common materials for threads
\nare polypropylene and polyethylene. While the polypropylene threads are softer, polyethylene
\nis more resistant to drastic temperature changes in rougher climate areas.<\/p>\n
<\/p>\n
Depending on the sport played on the grass, the height of the threads is between 10 and
\n60mm, the colour is usually green, although other colours are also produces, for example
\nterracotta for tennis courts and white, yellow or blue for the lines.<\/p>\n
Except in the height of the threads, the grass also differs in type of threads:<\/p>\n
Although it looks thinner, monofilament is more robust in cross section than fibre threads are,
\nwhich makes it more resistant to wear and it also makes grass stronger. Dtex is a marker for
\nquality threads. It is a measuring unit for linear mass density of threads and it show mass in
\ngrams. 12,000 dtex, for example, means that 10km of threads weighs 12kg. The more is grass
\ndensely tufted, the quality is better, so that this property, using technical characteristics,
\nrepresents as tufts\/m 2 . Lower grass (20-25mm) has around 20,000-25,000 tufts\/m 2 , while a
\n60mm grass has from 8,000-10,000 tufts\/m 2 . Tennis courts need a very dense low grass with
\naround 40,000 tufts\/m 2 . In general, one rule stand for grass quality: more material \u2013 better
\nquality \u2013 bigger price. Often, the quantity of material is thread net weight on a square metre
\n(net pile weight g\/m 2 ) and weight together with the foundation (total weight g\/m 2 ). Colour
\nconsistency under UV radiation is also very important for the quality of grass. Manufacturers
\nof quality grass mostly give a guarantee on their products which last between 6 and 10 years.<\/p>\n
Synthetic lawn can be put on a concrete or asphalt, but for open fields it is much better to
\ninstall it on a drainage layer made of road metal and sand. Drainage layer is 20-30cm thick
\ndepending on size and purpose of the field. Manufacturers usually give detailed instructions
\nfor preparation of the drainage layer.<\/p>\n
![\"artificial](\"https:\/\/www.podovi.org\/en\/wp-content\/uploads\/sites\/2\/2022\/08\/installing-artificial-grass-jpg-800x364.webp\")
<\/p>\n
A well tramped and precisely levelled drainage layer is covered with rolls of artificial grass,
\nwhile the ends of the rolls are connected and pasted to outer ribbons using polyurethane
\nelastic glue. The lines in other colours are also connected by outer ribbons.<\/p>\n
The filling with quartz sand and grinded rubber is done manually or using special machines,
\nslowly and carefully, with constant brushing of the grass so that the threads do not lay down
\nor stay buried. Quartz sand helps the threads to stay up and it also gives the fields certain
\nsports characteristics. Tennis courts are filled only with sand, while the football pitches have
\ngrinded rubber which makes them elastic and soft. Sand grains must be round in order not to
\ndamage the threads. For lower grass, up to 40mm, a finer sand fractions are used (0.3-
\n0.8mm), and for higher grass larger (0.6-1.2mm)<\/p>\n
Rubber can be recycled, gained by grinding of old car tires or EPDM granules in grass
\ncolours, which is a better, but a more expensive solution. The amount of filler also depends
\non the height of threads and it is between 12-20kg of sand and 6-15kg of rubber per square
\nmetre.<\/p>\n
The most important thing for an artificial lawn is to be brushed. This can be done manually \u2013
\nby metal rake or using machines. Maintaining the lawn properly, the level of the rubber and
\nsand stays balanced on complete area, and it stops the fillers to mix with threads.<\/p>\n","protected":false},"excerpt":{"rendered":"
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