From 06/03/2014 through 10/16/2012
3. “Synthetic materials are currently used for all kinds of purposes, in particular the use of all kinds of synthetic materials in artificial lawns for sports fields has experienced a strong growth the last few years. The development of artificial grass fibres and of artificial grass sports fields derived therefrom has expanded to such an extent that it is now possible to install artificial grass sports fields which are hardly distinguishable from natural grass sports fields as regards their appearance but in particular as regards their playing characteristics.
The last few years researchers have focussed in particular on the development of artificial grass fibres for use in artificial lawns for sports fields, taking into account in their research the fact that each individual sport has its own specific requirements as regards the subsoil and the surface properties of the material.
Standard synthetic materials that are currently used in the development of artificial grass fibres are polypropylene, polyamide and/or polyethylene. The advantage of such materials is that they can be produced at low cost and are easy to process, and that said synthetic materials can be readily processed into artificial grass fibres by stretching. Said fibres having a specific length are attached to a carrier, for example by tufting or another manufacturing technique. A drawback of the present artificial grass fibres in comparison with natural grass fibres is that the risk of injury resulting from the higher frictional resistance between the players' skin and the artificial grass fibres is much greater.”[Slootweg et al, US Patent 8,283,016 (10/9/2012)
2. “The present invention relates to artificial turf. More particularly this invention concerns artificial turf for use as a sport field, garden element, golf surface, or the like and comprising a base layer, a multiplicity of blades projecting up from and anchored in the base layer, and a mass of damping material on the layer through which the blades project. The invention also relates to a method of making such artificial turf.
In artificial turf it has proven effective to fix fibers that are similar to natural blades of grass to a substrate and to fill the spaces between the fibers with a damping material. Shredded car tires are for example used as the damping material for filling. The disadvantage with such known artificial turf is that they do not have sufficient resilience and do not stand up again or do not stand up sufficiently after being loaded. Furthermore, the shredded car tires pollute the environment.”
[Morton-Finger, US Patent 8,283,003 (10/9/2012)]
1. “Artificial turf is a surface of synthetic fibers made to look like natural grass. It is most often used in arenas for sports that were originally or are normally played on grass. However, it is now being used on residential lawns and commercial applications as well. The main reason is maintenance—artificial turf stands up to heavy use, such as in sports, and requires no irrigation or trimming. Domed, covered, and partially covered stadiums may require artificial turf because of the difficulty of getting grass enough sunlight to stay healthy. But artificial turf does have its downside: limited life, periodic cleaning requirements, petroleum use, toxic chemicals from infill and some heightened health and safety concerns with children.
Artificial turf first gained substantial attention in the 1960s, when it was used in the newly constructed Astrodome. The specific product used was developed by Monsanto and called AstroTurf; this term since then became a colloquialism for any artificial turf throughout the late 20th century. AstroTurf remains a registered trademark, but is no longer owned by Monsanto. The first generation turf systems (i.e., short-pile fibers without infill) of the 1960s has been largely replaced by the second generation and third generation turf systems. Second generation synthetic turf systems featured sand infills, and third generation systems, which are most widely used today, offer infills that are mixtures of sand and recycled rubber.”
(Wikipedia, Artificial Turf, 10/16/2012)
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Roger D. Corneliussen
Maro Polymer Links
Tel: 610 363 9920
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Copyright 2012 by Roger D. Corneliussen.
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* Date of latest addition; date of first entry is10/16/2012.