Friends who grow vegetables in greenhouses know that the emergence of Po greenhouse film can greatly increase crop yields. More and more farmers use Po plastic film. However, driven by profit in recent years, there have been many counterfeit or substandard products on the market in recent years. Po film, which caused serious economic losses to farmers. In order to allow farmers to better distinguish the authenticity of Po plastic film and avoid unnecessary losses, here are some ways to identify the film:
1. Understand the composition of the membrane
The Po greenhouse film of better quality generally consists of four layers, one layer is nylon; the second layer is Po layer; the third layer is insulating layer; the inner layer is coating layer, mainly using nano-coating technology. Its function is to disperse the hydrophilic inorganic substance on the basic material of the plastic film, and form the film through the force between the nanoparticles, keeping the tensile strength of the film thin. The tensile strength of high-quality Po film is more than 5 times that of ordinary plastic film, which is mainly caused by a layer of nylon structure.
2. Compared with the plastic film of ordinary greenhouse
Compared with ordinary plastic film, PO greenhouse film has the advantages of long use time, better transparency, stronger insulation performance, super tensile strength, super continuous defogging, strong dripping ability, anti-static, no dust, etc. Favor of farmer friends. At present, there are many manufacturers of Po plastic film. As the quality cannot be guaranteed, the following four aspects should be considered when buying in the market:
(1) Dustproof: The excellent outer surface coating of the epoxy resin film can prevent the adsorption of dust and will not precipitate in the greenhouse film, thereby greatly increasing the light transmittance of the film. As long as the rain washes through the rain, the film will look like new.
(2) Long use time and anti-aging: Compared with grouting film, PO greenhouse film can be used for high-temperature shed construction for several years, and grouting film can only be used for one year, and the light transmittance is poor. The service life of poor-quality Po film is about 1 year.
(3) Anti-fog non-drip time: The anti-fog dripping of the better quality Po film is permanent. This is because the inner coating of the better quality Po greenhouse film is not film-like, but granular.
(4) Good stretching effect: Po plastic film nylon material is of good quality, and the stretching capacity is at least 5-10 times that of ordinary films.
3. Price comparison:
We should go to some legitimate stores or buy old brand Po plastic film, and don't try to be cheap and cause other troubles. Secondly, when purchasing, you must ask the dealer for the purchase invoice, which can be used as evidence of rights protection when there is a problem. Due to the high-quality effect of PO greenhouse film, the price is relatively high. At present, the price of Po plastic film on the market is about 2 yuan per square meter. If it is lower than this price, we should buy with caution.
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