The film pressing groove, also known as the greenhouse clamping groove, is one of the most important accessories in greenhouse fittings. It is an important accessory used to secure the greenhouse film and create ventilation openings in the greenhouse. The film pressing groove is one of the main accessories for fixing the greenhouse film, working with a spring clip to secure the greenhouse film. The greenhouse clamping groove is made of hot-dip galvanized steel plate, rolled by film pressing groove equipment. It has good performance, good forming, high wind resistance, a smooth surface that does not damage the film, a thickness of 0.5mm-0.8mm, a width of 30mm, a height of 12mm, can accommodate double springs, increasing wind resistance, and a length of 4m-6m. It can also be custom-made according to customer requirements. The matching spring clip is made of 2.0mm steel wire, with an insertion length exceeding two meters, strong elasticity, and a plastic coating process. It has good performance and a smooth surface.

Greenhouse film pressing grooves are equipped with spring clips. The spring clips are made of 2.0mm high-elasticity steel wire, with a plastic coating process, and a smooth surface that does not damage the film. The product features an internal corner design with a self-locking function, allowing for the simultaneous use of multiple clips. When the spring clip is in the groove, it forms two angles, a and b, with the groove. When strong winds act on the film, the force is transferred to the spring clip. According to the principle of mechanics, if a>b, the spring clip moves upward. Similarly, after the first spring clip is installed, the spring clip is naturally pulled downwards, and then the next clip is installed. This increases the speed of on-site installation, making it efficient and convenient.

There are many types of greenhouse film pressing grooves, which can be further divided into many categories according to different roof frame materials, glazing materials, shapes, and heating conditions. Modern greenhouse film pressing grooves play an important role in creating the required environmental conditions for plant growth.

Matters Needing Attention During Use

1. For convenient ventilation and other management work, the greenhouse top film and side film are covered separately, usually using a three-part film covering method: one top film and two side films. The top film is 7.5～8.0 meters wide, and the side film is 1.2 meters wide. First, install the side films and secure them with the grooves. Then, cover the top film and secure both ends with spring-loaded grooves. Press each arch with a film pressing line (strip). The top and side films should overlap by 20～30 centimeters at the junction, with the top film pressed over the side film. Film-lifting rods can be installed on the sides of the top film to facilitate ventilation. The part of the side film touching the ground should be sealed with soil. Covering the greenhouse should be done on a windless day to prevent wind damage to the film. After covering, press down the film pressing strips firmly.

2. When ventilating the greenhouse, first lift the top film upwards. When the temperature rises again, put the side film down. When covering, first clamp or fasten the side film, then put down the top film. Lifting and covering should be performed in reverse order.

3. After building the greenhouse, dig deep ditches around it to lower the groundwater level to facilitate the growth of vegetables inside.

4. During the use of the greenhouse, prolonged sunny days without rain may cause dust to accumulate on the film, directly affecting light transmission. Experiments show that after 10 sunny days, the light transmittance of the washed and unwashed areas of the top film differs by 25%. Therefore, the film should be cleaned regularly to ensure that it is clean and efficient. This is one of the important ways to improve the use effect of the greenhouse.

Function

1. Light Transmission Function of Greenhouse Film Pressing Grooves

Greenhouse film pressing grooves are used for light transmission construction, so light transmittance is a fundamental indicator for evaluating their light transmission function. Light transmittance refers to the percentage of light that passes through the greenhouse film pressing groove compared to the outdoor light. The light transmittance of the greenhouse film pressing groove is affected by the light transmission function of the covering material and the shading rate of the frame. It also changes with the different positions of the sun at different times of the year. The level of light transmittance directly affects crop growth and the choice of crops.

2. Heat Preservation Function of Greenhouse Film Pressing Grooves

Heating energy consumption is a major obstacle to the operation of greenhouse film pressing grooves in winter. Improving the heat preservation function and reducing energy consumption are direct means of improving the production efficiency of greenhouse film pressing grooves. The heat preservation ratio is a basic index to measure the heat preservation function of greenhouse film pressing grooves. The heat preservation ratio refers to the ratio of the area covered by materials with lower thermal resistance to the total area covered by materials with higher thermal resistance in the greenhouse film pressing groove structure and the ground area. The larger the heat preservation ratio, the better the heat preservation function of the greenhouse film pressing groove.