What types of greenhouse films are there? Detailed explanation of the main types
With the application and promotion of greenhouse cultivation technology, the use of greenhouse film products in agricultural production has become increasingly widespread, and most greenhouse film structures are trending toward composite development, with more comprehensive performance as well, such as light transmission, heat preservation, long service life, and so on. Of course, different types of greenhouse films also differ in their characteristics, so farmers must clearly distinguish among them before use. So what types of greenhouse films are there? Let's find out together.
1. Polyvinyl chloride (PVC) greenhouse film
1. Advantages: good light transmission (the total light transmittance of a new film reaches more than 85%), excellent moisture retention, low thermal conductivity, high tensile strength, and strong wind resistance.
2. Disadvantages: the film has a high specific gravity; for a greenhouse of the same area, its usage is 1/3 more than that of polyethylene, increasing costs. In addition, the film surface easily attracts dust, and generally after one month of use its light transmission becomes very poor; residual film causes great soil pollution and cannot be disposed of by burning.
Main products include: ordinary PVC greenhouse film, PVC anti-aging film, PVC drip-free anti-aging film, PVC weather-resistant drip-free dust-proof film, etc.
2. Polyethylene (PE) greenhouse film
1. Advantages: light in texture, soft, easy to shape, good light transmission, non-toxic, suitable for various greenhouse films and mulch films, and currently the main agricultural film variety in China
2. Disadvantages: poor weather resistance, poor heat preservation, and not easy to bond.
Main varieties include: ordinary PE greenhouse film, PE anti-aging film, PE drip-free anti-aging film, PE multifunctional composite film, etc.
3. Ethylene-vinyl acetate copolymer (EVA) greenhouse film
1. Advantages: strong light transmission, excellent drip flow and fog dispersion, with a drip flow period of more than 4-6 months, and also excellent performance in heat preservation, dust resistance, and aging resistance.
2. Disadvantages: relatively high price.
Main varieties include: EVA drip-free anti-aging high heat-preservation greenhouse film, EVA multifunctional composite greenhouse film, etc.
4. Light-regulating greenhouse film (functional film)
Light-regulating agricultural film is made by adding rare earths and other functional additives to PE resin; it can selectively transmit light and is a new type of covering material that can make full use of solar energy. Compared with other greenhouse films, it provides better warming and heat preservation inside the greenhouse, stronger biochemical effects on crops, and functions such as early maturity, high yield, and improved nutritional content for different crops. It is mainly suitable for the cultivation of chives and various leafy greens.
5. Propylene oxide (PO) greenhouse film
PO film is also a new type of film developed in recent years. This type of film is a high-end functional polyolefin agricultural film produced from polyolefins. Its light transmission, continuous fog dispersion, drip flow, and heat preservation are among the leading levels among greenhouse films, and its cost-effectiveness is relatively high.
Main products include: 8-silk PO film, 12-silk PO film, 15-silk PO film, etc.
At present, in daily applications ranging from traditional inserted-ground arch sheds, solar greenhouses, double-slope greenhouses, multi-span film greenhouses, and mushroom greenhouses, various greenhouse films can be seen. The above five types of greenhouse films have similarities and differences in properties, so their use effects also differ. Farmers must choose suitable products based on the characteristics of the greenhouse film itself.
For wonderful pictures and text and popular comments about greenhouse film types, you may be interested in the following recommended content from Nongxun Network. Welcome to read.
Agricultural products you may be interested in: national high-quality greenhouse film supply