We know that the varieties of stretched film are different, and the functions of different stretched films are different. There are four kinds of stretched films that are common: PVC stretch film, PE stretch film, ethylene-vinyl acetate copolymer Stretch film and dimming stretch film. The four stretch film products are identical in nature and vary. Therefore, the application is still somewhat different. Let's take a look at the function of these stretched films: the primary advantage of PVC stretch film is thermal insulation, light transmission, weather resistance, softness, easy to shape, suitable for use as a cover for greenhouses, greenhouses and small and medium sheds. The defect is that the film ratio is severe (1.3 g/cm 3 ), and the cover film area of the certain weight is reduced by 1/3 compared with the polyethylene film (pe), and the cost is added; the hardening and embrittlement at low temperature are easy to soften and relax at high temperature; After the auxiliary agent is separated, the membrane surface is vacuumed, which affects the light transmission, and the residual film cannot be burned, because of the chlorine gas attack. Generally, the PVC shed film does not participate in the anti-aging auxiliaries during the film-forming process. The application period is only 4-6 months. It can produce one season crops, dregs the power, add labor and capital, and is now gradually selected.

The PVC anti-aging film participates in the anti-aging additive in the quality guessing and is calendered into a film. It has a useful application period of 8-10 months. It has excellent light transmission, heat preservation and weather resistance. It is the primary information hidden in greenhouses and small and medium-sized arch sheds. It is mostly used for delaying cultivation in spring and early autumn. Stretch film

PVC stretch film together has anti-aging and dripping characteristics, good light transmission and heat preservation, no dripping can continue for 4-6 months, safe use life of 12-18 months, more widely used, is now highly efficient The preferred cover material for energy-saving solar greenhouses is better for covering the data in greenhouses.

PVC stretch film weathering and non-drip dust-proof film, in addition to weathering drip function, the surface of the film is treated, the plasticizing split is less, the dust is lighter, the light transmittance is improved, and the winter greenhouse is cultivated in the greenhouse and greenhouse. More favorable.

PE stretch film is light in texture (specific gravity 0.92 g / cm 3 ), soft, easy to shape, good light transmission, non-toxic, suitable for all kinds of greenhouse film, plastic film, is China's primary agricultural film variety. The defects are: weather resistance and heat preservation are poor, and it is not easy to bond. It is assumed that the production of greenhouse film, it is necessary to participate in anti-aging agents, no drops, insulation agents and other additives, in order to adjust the requirements for production. The main products of stretch film manufacturers are:
1. General PE shed film does not add anti-aging and other additives directly to the "white film" produced by data blow molding. Nowadays, the greenhouse and small shed are used in large quantities, generally in spring and autumn, and the application period is only 4-6. In the month, only one crop can be cultivated, the power is ruined, the labor is added, and the production is gradually selected.
2. PE anti-aging film (nurse-aged gate film) is an anti-aging additive in pe resin and blown into a film. The thickness of the shed film is 0.08-0.12 mm, and the application period can reach 12-18 months. It can carry out 2-3 season crop cultivation, not only the extension of the application period, the cost is reduced, the energy is saved, and the output value and the output value are greatly added. Nowadays, the key agricultural film varieties are promoted in equipment cultivation.
3. PE non-drip anti-aging film (double anti-agricultural film) together with dripping, weather resistance, light transmission and heat preservation, anti-fog effect can adhere to 2-4 months, anti-aging life can reach 12 -18 months, it is now widely used, widely used agricultural film varieties, not only for greenhouses, large, medium and small sheds, but also suitable for energy-saving solar greenhouse early spring carp culture.
4. PE insulation shed film This kind of cover data can block the infrared radiation to the atmosphere, can improve the temperature of the greenhouse 1-2 °C, and the effect is better in the ice-cold area.
5. PE multi-functional composite film has many functions such as no dripping, heat preservation, weather resistance, and turtle age, and some have the function of blocking ultraviolet rays, so that the ultraviolet rays in the shed can be reduced. Some can be composed of sclerotium sclerotiorum and gray mold spores. The application period can be up to 12-18 months.
6. Ethylene-vinyl acetate copolymer (eva) shed film eva resin is a new agricultural film material used in agriculture in recent years. The agricultural film produced by it has better light transmittance, heat preservation and weather resistance than pvc or Pe agricultural film. Eva agricultural film cover can increase production by about 10% compared with other greenhouse films. It can be used for more than 2 years. It will not be deformed before aging. It can be easily recycled after use, and it is not easy to constitute soil or environmental pollution.