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Report | July 2017

Mobile air conditioner to wear

Functional cooling textiles of core sports and occupational safety brands use a special superabsorber fleece from BASF.

Humans are born runners. Evolution once gave us the ability to overcome the distance of many kilometers through the hot savannas of Africa. In addition to the upright posture of the body and head and the optimized mechanics of legs and feet, cooling by millions of sweat glands plays a key role. Under extreme stress, they can release about one liter of sweat per hour and cool down the body by evaporation.

But as often seen in nature, this specialisation comes at a price. To keep its core temperature stable, the body has to expend much energy to protect itself from overheating. About 75 per cent of the energetic processes in physical exertion are used for thermoregulation and therefore only 25 per cent of the energy can be used for muscular processes such as sports or work performance.

This limits our performance even at moderate outdoor temperatures. Athletes as well as workers and many other people worldwide who are exposed to high temperatures are therefore now using active functional cooling clothing. Thanks to innovative materials, this provides evaporative cooling, which is individually doable and lasts for hours. The functional cooling textiles of the E.COOLINE and IDENIXX brands, incorporating the specially-developed superabsorbent nonwoven fabric from BASF, offer a mobile air conditioning system to wear which effectively supports the cooling system of the human body.

Cooling vests, for example, are easy to use and can be worn like any other item of clothing once being activated by “charging” with water. The water enters the active layer – the Luquafleece® from BASF – after being rapidly absorbed and distributed through a bacteriostatic textile fabric. “The fibres of this nonwoven fabric are coated with superabsorbent polymers (SAP) through a special technology. They absorb the water in a few seconds and retain it,” explains the expert Norbert Heidinger of BASF New Business GmbH, who markets the material.

Like a fishing net, the polymer network of the superabsorber traps increasing numbers of water particles until its elastic restoring forces compensate the osmotic forces of the prevailing concentration gradient. In this way Luquafleece® can absorb ten times its weight in water and retain it so firmly, that the functional textiles are dry on the surface.

With higher outdoor temperatures or increasing skin temperature during sports or work activity, the water molecules firmly bound inside the functional cooling clothing absorb the thermal energy, evaporate from the large surface of the three-dimensional nonwoven structure and thereby cool down the wearer. The body sweats less and thereby saves energy that would usually be needed for thermoregulation. External cooling can there-fore provide an increase in performance of up to 10 per cent in hot conditions. Moreover, important body parameters – such as heart rate – are improved which protects people’s health.

Athletes who work out want to have fun, while promoting their health and also testing their own limits. These limits are only reached through the interplay of mind and body, explains a prominent triathlon champion, who calls it a relationship of trust. If the head wants to increase performance, it has to learn how to interpret the body’s signals correctly. You must not stop efforts too early, neither exceed the own capabilities.

The functional clothing only cools the body to the extent required by the prevailing situation. The intensity of evaporative cooling adapts to the surrounding temperature and exertion. Thus no negative cooling effects can occur. “After a while, you even don’t notice the cooling anymore because the body is air-conditioned,” is how Gabriele Renner CEO of the manufacturing company “pervormance international GmbH” from Ulm (Germany), describes the benefits.

“You sweat less and thereby relieve the load on the cardiovascular system, metabolism and energy balance.” Depending on the outdoor and body temperature, the cooling effect persists for up to 20 hours – and any other clothing stays dry.

Since the World Football Championship in 2014 in Brazil, functional cooling textiles have been used at many international sporting events worldwide. For example, the national football teams from Switzerland, Ireland and the USA nowadays use these cooling vests and headgear to improve their recovery during the half-time interval or before energy-intensive extra time.

But not only top athletes are improving their health and performance with active functional cooling clothing. Many companies also use it to protect their employees from the hazards connected with overheating and overexertion.

With the E.COOLINE and IDENIXX brands, the idea of mobile, simple and effective cooling has therefore been successfully implemented and marketed. Apart from innovative materials, the environmentally-friendly bionic system only requires water and the heat the user wants to get rid of anyway.

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