The light-shielding film, as its name suggests, is a film used to block sunlight. Light transmittance is the main parameter for detecting the shading effect. How to test the transmittance of black shading film with a professional light transmission meter?
The light-shielding film, as its name suggests, is a film used to block sunlight. Common materials include PET and TPU. At present, there are automobile insulation film, agricultural film and the window film. The agricultural film is commonly known as the mulch film. It is used to cover the plant cultivation ground to reduce the light intensity and increase the soil temperature, and to promote the growth of plants. Compared with colorless, transparent, white, silver-gray and other color films, the black light-shielding film has a lower light transmittance, and it is better to use black mulch film in the cultivation of some weeds or high-temperature seasons. .
However, it is unscientific to pursue low light transmittance blindly. Low light transmittance can effectively prevent evaporation of water in the soil and lower the temperature to prevent burning of the seedling; however, too low light transmittance will affect the growth of plants. Therefore, the light transmittance of the agricultural black light-shading film needs to be controlled according to the actual situation. How do we test the transmittance of the black shading film? Here we recommend using the professional light transmission meter LS117 for testing.
Many light transmission meters on the market are designed for the regular transmission characteristics of transparent materials. The black light shielding film can transmit light, but it is not transparent. Therefore, it is necessary to test such an opaque black mulch film using the professional light transmission meter LS117 with diffuse transmission principle.
The operation is very simple. First, turn on the device without placing any material between the two sleeves (light source and detector) of the professional light transmission meter. After about 10 seconds of warm-up, the screen will show the light transmittance (T) 100.00% and optical density (OD) is 0.000. At this time, the black light-shielding film can be laid between the sleeves. The two sleeves should be close to the film to be tested. The stable data seen after 1 to 2 seconds is the black light-shielding film we need to test. Light transmittance. As shown in the figure below, we can see that the black light-shielding film has a light transmittance of 8.9972%.
Through many tests, the light transmittance of different kinds of mulch films can be known, and then the black shading film which is most suitable for plant growth can be found by applying to different cultivation experiments. The above is our detailed advice on how to test the transmittance of black shading film with a professional light transmission meter and the detailed operation process. If you have more questions, please feel free to contact our technical service staff.