Types and thicknesses of plastic film for greenhouses

Types and thicknesses of plastic film for greenhouses

There are many kinds of plastic greenhouse films in greenhouses, and different greenhouse films have different functions. In addition, the thickness of the greenhouse film has a lot to do with the growth of crops. The greenhouse film is a plastic product. In summer, the greenhouse film is exposed to the sun for a long time, which is easy to age and become brittle, which is also related to the thickness of the greenhouse film. If the greenhouse film is too thick, it will cause aging, and if the greenhouse film is too thin, it will not play a good role in temperature control. Furthermore, the thickness of the greenhouse film is also related to the type of crops. Crops, flowers, etc. need to choose different greenhouse film products according to their growth habits.

What kind of greenhouse film is needed to build greenhouse plastic film? Commonly used plastic greenhouse film is divided into PO agricultural film, PE agricultural film, EVA agricultural film and so on according to the material. Details are as follows:

PO agricultural film: PO film refers to the agricultural film made of polyolefin as the main raw material. It has high tensile strength, good thermal insulation performance, and can well protect the growth of crops. Tensile strength means that when the agricultural film is covered, it needs to be tightened, the tensile strength is not good, and it is easy to tear, or even if it is not torn at the time, it will cause damage to the PO agricultural film in case of a strong wind attack. Good thermal insulation, which is the most basic requirement for crops, the need to control temperature and humidity inside the film, which is different from the environment outside the shed film. Therefore, PO agricultural film has a good temperature and humidity control effect, which is of great help to the growth of crops, and is deeply loved by people.

PE agricultural film: PE agricultural film is a polyethylene agricultural film, and PE is the abbreviation of polyethylene in English. Polyethylene is a kind of plastic, and the plastic bag we use is a PE plastic product. Polyethylene has excellent chemical stability and is resistant to various chemical substances such as hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, amines, sodium hydroxide, potassium hydroxide and other chemical substances at room temperature. Destructive effect; polyethylene is prone to photo-oxidation, thermal oxidation and ozone decomposition, and is easily degraded under the action of ultraviolet rays. Carbon black has excellent light shielding effect on polyethylene. After irradiation, cross-linking, chain scission, and formation of unsaturated groups can occur.

EVA agricultural film: EVA agricultural film refers to the agricultural film product with ethylene-vinyl acetate copolymer as the main material. The characteristics of EVA agricultural film are: good water resistance, good corrosion resistance, and high thermal insulation.

Water resistance: closed cell structure, non-absorbent, moisture-proof, good water resistance.

Corrosion resistance: resistant to corrosion by seawater, grease, acid, alkali and other chemicals, antibacterial, non-toxic, odorless, and non-polluting.

Thermal insulation: excellent thermal insulation, thermal insulation and cold protection and low temperature performance, can withstand severe cold and exposure.

How to choose the thickness of the greenhouse film? The thickness of the greenhouse film has a great relationship with the light transmittance, and also has a great relationship with the effective service period.

Valid use period: 16-18 months, the thickness of the optional shed film is 0.08-0.10 mm;

Valid use period: 24-36 months, the thickness of the optional shed film is 0.12-0.15 mm;

The thickness of the film used in the multi-span greenhouse needs to be more than 0.15 mm.