The selection of greenhouse agricultural film should pay attention to quality

With the great development of agricultural science and technology, science and technology to rejuvenate agriculture is no longer just a verbal call. More and more agricultural production collectives and individuals have begun to pay attention to the benefits of scientific and technological products to agricultural production efficiency. Greenhouse agricultural film is more and more widely used in agricultural production. There are many varieties of agricultural film on the market, the products are mixed, the quality is uneven, and farmers often cannot distinguish the quality of the product when buying. So when buying greenhouse agricultural film, how to identify the advantages and disadvantages of greenhouse agricultural film? We simply summarize it into four words: look, drag, poke, burn. The specific explanation is as follows:
First of all, we look at the light transmittance of this shed film, the more transparent it proves that the quality of the shed film is better, and vice versa. Secondly, look at the color uniformity of the film, the domestic greenhouse agricultural film due to the lag of the production process, mainly blow molding, and the blow molding manufacturing process is affected by the temperature is relatively large, the thickness is different, the performance is uneven color, the thick place is dark, the thin place is light color, in the windy weather, the shed film is most likely to start a large area of tearing from the thin place.
Drag This method mainly tests the tensile strength of the shed film. The method is: first pull laterally along one corner of the shed film, and then pull longitudinally, do destructive tests, pay attention to not use force in a large area, pull a corner by hand, the more strenuous, the more difficult it is to pull off, proving that the tensile strength is better; If it breaks with a gentle pull, the quality is relatively poor. The tensile strength is large, indicating the wind resistance of the shed film and the stronger the durability.
Poke Poke a small hole with your finger in the middle of the greenhouse agricultural film, and then tear it along the hole to the four sides to increase the area of the hole. If you use a little force, the hole will expand in a large area, indicating that the quality is not very good, the use will not last, if you encounter windy weather after going to the shed, it will often lengthen with the wind from a small mechanical wound, so as to rot and can not continue to be used.
Burning Any chemical will produce a certain chemical reaction after meeting fire. And what we use is to burn with fire and smell. If it is very smelly after ignition, accompanied by a pungent smell, and a large amount of black smoke, dripping a lot of black floc, the material of this shed film is PVC, if it is marked as PE, EVA, it is likely to be added to part of the recycled material in the production, the quality is not very good. PE and EVA materials have a pungent smell and smoke, but not black smoke.