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Hail Nets

Hail net protects the crop that is under the hail nets. In Northern Europe, crystal net is most commonly used. Crystal netting allows the most light to pass through (high light transmission). The thread of the net also lets light through. The thread has a diffuse effect. This means that the light is broken into multiple beams. However, hail nets must be hung at a sufficient distance to take full advantage of the diffused light. Hail nets are used above orchards with apples, pears and much more. Hail nets provide protection from hail, hard driving rain, birds and insects such as the Asian stink bug. Hail netting also provides protection from the wind. The climate improves under hail nets because the peaks are flattened.

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Technical specifications hail nets

The mesh size of the Wiesel hail nets, the type of hail net that FruitSecurity Holland only works with, is 2.8mm x 8.7mm. The thickness of the thread is 0,32mm. The tensile strength per single thread is 3,5 kg. The  weight is approximately 48 grams per square meter. Hail net is produced from high density polyethylene. Often referred to as HDPE. High Density Polyethylene. Hail net is made with monofilaments. These are the threads or yarn that the hail net is woven from. The net is woven using the Leno technique. The threads are woven into warp threads which ensures that the nets retain their shape when struck by hail, for example.
 

KLY value for hail nets

The UV resistance of hail nets is indicated by the KLY value. The KLY value does not say anything about the service life of hail nets. In the production of hail nets the wires are made of PEHD. Polyethylene is not UV-resistant by itself. Therefore additives are added. In black and grey nets this additive goes through the whole thread. It mixes completely with the material. Crystal hail netting, however, has a different chemical composition. The additive that determines the KLY value is on the outside of the yarn. The major disadvantage of this is that it makes the nets more brittle. Therefore, an optimal composition that provides sufficient UV protection but also retains sufficient flexibility is necessary!

Lifespan hail nets

The lifetime of hail nets is largely determined by their resistance to UV radiation. Mechanical strength is certainly just as important. Hail nets lie outside in the wind all day long. Hail nets must therefore be able to withstand these movements. This is already determined during the production of the yarn. The Wiesel hail nets have a shrinkage of 3% at boiling water temperatures. This is very decisive how the nets hold up in all weather conditions.