Choose Greenhouse Film with Transmittance Meter

Time:2020/03/23 11:30:00 Browse:517

The cultivation of flowers and vegetables in the greenhouse can fully block the wind and sun in the natural world. The greenhouse film has a strong protective effect and can further improve the survival rate of plants. In general, the greenhouse films used in greenhouses have high light transmittance for plants to absorb light. The light transmittance of such greenhouse films needs to be measured by a transmittance meter.
       For plants, photosynthesis is a necessary process for the synthesis of products and light is a necessary condition. In order to increase the production of fruits and vegetables, many farmers choose to grow in greenhouses. The main function of the greenhouse is to provide suitable growth temperature and to control indoor humidity and rain spray. The greenhouse film is generally a plastic film with high light transmittance and stable performance, which can better pass outside light. In addition, the shed film has a soft and malleable texture. It can effectively maintain heat and is non-toxic and harmless to the human body. It can maintain relative stability when used as an agricultural film cover.
       The plastic film used in the market for shed film tends to suffer from aging and cracking after a period of use. The overall flexibility is reduced and the brittleness is increased. The light transmittance of this film is greatly reduced, which is not conducive to the normal growth of plants in the greenhouse. Generally, the light transmittance of the film after 5 months of use will reach about 55%. If it is lower than this value, it needs to be replaced with a new one in time. For the owner of a greenhouse, the use of a transmittance meter for periodic inspection has certain guarantee significance.
       The factors affecting the light transmittance of the greenhouse film come from many aspects. It can be divided into endogenous and exogenous causes. From the analysis of the endogenous causes, the damage of the light transmittance mostly comes from the composition of the plastic film, the actual thickness and the processing technology. Generally, the transparent film with a larger thickness has a lower light transmittance. The exogenous cause is closely related to the degree of wear in the external nature. Long-term artificial friction and repeated rubbing of small sand particles in the air will make the surface of the plastic film rough. And the light transmittance is not as good as before.
       The main raw material of greenhouse films commonly used in daily life is polyethylene and its main component is resin. With the increase in the adhesion of raindrops and dust in the air, after about two months, the light transmittance of polyethylene plastic films will decrease by about 20%. The plastic films of polyvinyl chloride will decrease by about 55%. A considerable part of the owners of greenhouses will add some surfactants to the film. This substance will cause water droplets to form films instead of beads, reducing erosion damage to the film and avoiding the blocking effect of water droplets. This measure has practical effects on improving the light transmittance of the shed film.
       Therefore, the transmittance meter is the key instrument for thin film detection in greenhouses. The LS116 transmittance meter of Linshang Technology resolution is 0.1% and the accuracy is better than ± 1%. From the perspective of performance, this transmittance meter is dedicated to the film light transmittance test. The transmittance meter can directly display the basic evaluation parameters of the maximum, minimum and average light transmittance of the film.