anti insect net knowledge

Insect-proof net and its impact on greenhouse ventilation
Installing insect-proof nets can effectively prevent insects from entering the greenhouse. Insect-proof nets are usually installed at air inlets, windows, doorways and other openings. The mesh size of the insect net should be enough to ensure effective prevention of insects from entering. Installing insect screens will increase the local resistance of the vents and should be considered when estimating ventilation volumes.
Insect-proof net selection basis
The mesh size of the insect-proof net should be determined based on the crops grown in the greenhouse, the season in which the insect-proof net is used, and the objects to be protected, and the insect-proof net with corresponding specifications and mesh numbers should be selected. If the mesh of the insect-proof net is too large, it will not have the desired insect-proof effect; if the mesh is too small, the insect-proof effect will be good, but the ventilation resistance will increase. In order for the insect-proof net to achieve good insect-proof effect, there is a corresponding relationship between the mesh size of the insect-proof net and the size of insects. The insect-proof net should be selected according to the type of insects to be protected.
According to the characteristics of the insect-proof net, it can fully exert its insect-proof effect. According to the use method of the insect-proof net, different insect-proof nets with different lifespans and prices can be considered. For example, ① When insect-proof nets are used inside the greenhouse, different insect-proof areas can be established, and short-lived and cheap insect-proof nets can be considered in some areas; ② Different anti-nets are used in different seasons; ③ They need to be used in harsh environments and For insect-proof nets used for a long time, their service life should be fully considered, and more attention should be paid to their rigidity, strength and other performance indicators.
Mechanical strength considerations When choosing insect-proof nets from the perspective of mechanical strength, attention should be paid to the following factors: ① Environmental factors to be considered include sunshine, wind erosion, hail, rain and snow; ② When the insect-proof net needs to be rolled up and used, the following factors should be considered: Damage and tearing caused by exposure; ③ When the insect-proof net needs to bear weight, possible damage caused by the load should be considered; ④ Damage and tearing caused by scratches by workers and equipment during installation and use; ⑤ Various Types of grinding
Damage may cause premature failure of all insect screens:
Commonly used insect net materials and specifications
1. Insect-proof net materials There are many types of materials that can be used as insect-proof nets. Although insect-proof nets made of stainless steel or copper have the outstanding feature of long life, they are more expensive. The insect-proof nets used in greenhouses are mainly made of engineering plastics. Common insect-proof net materials include the following.
(1)Polyethylene
①Single wire mesh. It is a typical polyethylene insect-proof net, which is woven from a single silk thread. This type of silk thread is similar to fishing line and can be spun into very strong nets.
② Membrane mesh. Made of microporous polyethylene film. This type of insect-proof net is cheap, but has shortcomings such as low strength, poor UV protection and high ventilation resistance.
(2) Polyethylene/acrylic acid synthetic material Acrylic yarn is a multifilament, which can effectively increase the friction resistance between yarns, prevent sliding between yarns, and has a good stabilizing effect on the mesh shape.
(3) Nylon has the characteristics of low cost. Its disadvantages are poor durability and large ventilation resistance.
Insect net structure type
(1) Textile forming Textile mesh is the most commonly used mesh structure today, with warp and weft lines staggered to form mesh. The tightness of the net needs to be inspected. If the mesh is twisted and deformed due to side pulling force, it will affect the insect-proof effect and the passage of airflow.
(2) Braiding and forming: The network cables of the braided mesh are tied to each other to form a mesh, which can effectively resist the tearing and entanglement of the network cables. The entanglement of network cables and the formation of network knots will increase ventilation resistance.
(3) Punching forming As mentioned earlier, polyethylene film can be used to fill the micropores to make an insect-proof net. This kind of insect-proof net has relatively large ventilation resistance and is only suitable for some special occasions.
Insect-proof net specifications and types Insect-proof net specifications are generally expressed by "mesh". "Mesh" refers to the number of network wires within the length range of 1 inch. In addition to "mesh" reflecting the size of the insect-proof mesh, the mesh size also depends on the diameter of the network wire. By preventing
Inch (in) is a non-legal unit of measurement in my country, 1in=2.54cm