Vegetable greenhouse film creates miracles in crop yields

There are four main types of vegetable greenhouse films commonly used in my country. The first is polyvinyl chloride greenhouse film, the second is polyethylene greenhouse film, the third is ethylene vinyl acetate copolymer greenhouse film, and the fourth is dimmable agricultural film. These types have similarities and differences in nature, so the effects of use are also different. A polyvinyl chloride vegetable greenhouse film. It has good thermal insulation, light transmittance and weather resistance, is soft and easy to shape, and is suitable as an outer covering material for greenhouses and small and medium-sized sheds. The disadvantage is that the film has a large specific gravity (/ cubic centimeter). The coverage area of a shed film of a certain weight is smaller than that of a polyethylene film. The cost increases and it becomes hard and brittle at low temperatures. It is easy to soften and relax at high temperatures. After the additives are precipitated, the film surface attracts dust, affecting the light transmission. , the residual film cannot be burned, because chlorine gas is produced.
Dipolyethylene shed film is light in texture (specific gravity is about / cubic centimeter), soft, easy to shape, has good light transmittance, non-toxic, and is suitable for making various shed film mulches , is the main agricultural film variety in my country. Its shortcomings are poor weather resistance and thermal insulation, and it is not easy to bond. If greenhouse films are produced, additives such as aging-resistant agents, drip-free insulation agents, etc. must be added to meet the production requirements.
Triethylene vinyl acetate copolymer (abbreviation) vegetable greenhouse film. Adding a certain proportion of resin is a new agricultural film material used in agriculture in recent years. The agricultural film made of it has excellent light transmittance, thermal insulation and weather resistance. Stronger than or agricultural film. Agricultural film covering can increase production by about 10% compared to other greenhouse films, can be used continuously for more than a year, does not deform before aging, can be easily recycled after use, and is not likely to cause soil or environmental pollution.
Four dimmable vegetables The greenhouse film is a dimmable film made by adding rare earths and other functional additives to the resin. It can selectively transmit light and is a new covering material that can make full use of solar energy. Compared with other greenhouse films, the greenhouse film It has good warming and insulation effect, strong crop biochemical effect, early maturity, high yield and improved nutritional content for different crops. Rare earth can also absorb ultraviolet rays and extend the service life of agricultural films. Among them, the special purple film for leafy vegetables (leek film) is in the film Purple masterbatch and weather-resistant thermal insulation drip-free masterbatch are added inside, and are blown into a film. The film is slightly blue-purple in color, reduces strong light, increases temperature, advances the growth period, and achieves high quality and high yield. It is suitable for the cultivation of leeks and various green leafy vegetables.< br/> The special vegetable greenhouse film used for facility agricultural production and construction has better light transmittance, thermal insulation, tensile strength and aging resistance than ordinary agricultural films. It is of great significance to the growth, production and income of greenhouse crops.