Horticultural Plastic Film

The first is light transmission. The most important function of plastic film is lighting, and the film must meet the requirements of light quantity and light quality of crops in the facility. In addition, the different transmittance of different bands of light also determines the differences in the temperature, heat preservation and aging resistance of plastic films. For example, films with high transmission rate of long-wave radiation (thermal radiation) have relatively poor thermal insulation, and films with high transmission rate of ultraviolet light generally have low aging resistance. Therefore, the performance of the film can be improved by adding different auxiliaries in the film production process, so as to form different types of functional films.

The second is intensity. The covering material is the enclosure of horticultural facilities, which is exposed to nature for a long time, so it must be strong and durable, withstand wind, rain, sun, hail impact and snow pressure, and should also withstand the external forces such as stretching and extrusion during transportation and installation.

The third is the performance of preventing aging, which is related to the service life of the covering material. The aging of the film generally includes two aspects, one is that the film becomes brittle and automatically tears under the action of strong light and high temperature; The second is light attenuation, with the growth of the use of time, the light transmittance becomes low, so that it can not meet the requirements of vegetable growth in the facility, and lose the use value. In order to inhibit the aging process and extend the service life of the film, it is necessary to add additives such as light stabilizer, heat stabilizer, antioxidant and ultraviolet absorber when producing plastic film to become a covering material with anti-aging function (or strong weather resistance).

 

The fourth is anti-fog, anti-drip. Horticultural facilities are often a high humidity environment, and when the temperature is low, it is possible to create fog indoors or dew on the inner surface of the film. Fog or surface covered with water droplets, light transmittance will be reduced by 5% to 10%, affecting the indoor temperature; At the same time, fog drops and dew drops are easy to moisten the stems and leaves of crops, and induce the occurrence and spread of diseases. In order to overcome this shortcoming, it is necessary to add anti-fogging agents when producing plastic films.

 

The fifth is insulation. Horticultural production requires that the film has a high thermal insulation performance to meet the temperature requirements of winter and spring production.

But in the hot season or the areas with high temperature, what we should consider is how to reduce the temperature during the daytime.

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