Q1: When buying a sunshade net, the number of needles is the purchase standard, is that so? Why does the 3-pin I bought this time look so dense, like the effect of 6-pin, is it related to the material used?
A: When purchasing, you must first confirm whether it is a round wire sunshade net or a flat wire sunshade net.
Ordinary flat wire sunshade net can take the number of needles and the shade rate as the standard. For example, for the same 3-needle shade net, the density of 50% shade rate and 70% shade rate is different. For the same shading net with 70% shading rate, if 3 stitches are compared with 6 stitches, 6 stitches will appear denser, because 6 stitches use more material. Therefore, the number of stitches and the shading rate should be selected when purchasing.
The round wire shading net is generally 6 needles, and it only needs to be selected according to the shading rate.
Other aluminum foil shading nets, black and white shading nets, etc., are generally 6-pin, which can be selected according to the shading rate.
Note: The wire of the round wire shade net is like fishing line. Flat wire is flake. Their production process is different, the round wire is extruded, and the flat wire is a complete sheet-shaped net cut into small pieces, and then woven.
Q2: The sunshade net I bought was marked with 3 needles. After receiving the goods, it was much sparser than the picture, and could not achieve the sunshade effect I wanted. How to avoid this problem?
Answer: Generally, the cost of the sunshade net is composed of materials + craftsmanship. The price of the 3-needle sunshade net is less than 1 yuan/㎡, and the price should be carefully selected. When shopping online, try to choose a reliable brand, or a professional and reliable sales channel with brand authorization, and the quality is more guaranteed. Longlongsheng Net Industry Co., Ltd. has many years of manufacturing experience, high-quality production technology, and professional after-sales service. Welcome to inquire.
Q3: What is the difference between the black shading net and the silver shading net, and how to use it?
Answer: The main function of the sunshade net is to block the sunlight for the greenhouse, that is, to use its reflective surface or opaqueness to reduce the light entering the room in a certain proportion within a certain period of time, thereby reducing the amount of thermal radiation entering the room and preventing the indoor temperature. too high. At present, the shade nets on the market are mainly black and silver-gray. The black shading net has high shading rate and rapid cooling, but the disadvantage is that it needs to be pulled and placed every day, and it cannot be covered all day to avoid the formation of a weak light environment in the shed, which is time-consuming and labor-intensive. Black shade nets should be used for short-term coverage on greenhouse crops that require careful management in hot summer.
The silver-gray shade net has a low shading rate, but it is more convenient and can be covered all day. It is more suitable for greenhouse vegetables that like light and need long-term coverage.
Note: However, no matter what kind of shading net is used, the following two points should be paid attention to:
Coverage period and length of coverage.
The function of the shading net is to shade and cool down. In the absence of strong light and low temperature, the shading net cannot “sleep” on the greenhouse all the time. The sunshade net should be flexibly controlled according to the weather conditions, crop types and the requirements of light intensity and temperature in different growth periods of crops.
When setting the shading net, the shading net can be propped up, leaving a gap of about 20cm from the shed film, so that after forming a ventilation belt, the effect of shading and cooling is better. The external sunshade net used to support it also needs to consider whether the heat shrinkage of the sunshade net is stable. If the heat shrinkage is unstable, it will cause damage to the bracket and the card slot, or cause the sunshade net to tear. If you are not sure whether the heat shrinkage is stable, you can try it on a small area first.
In addition, if the heat shrinkage is too large, the shading rate will increase after a period of use. The shading rate of the shading net is not as large as possible. If the shading rate is too high, the photosynthesis of plants will be reduced and the stems will be thin and weak.
Q4: How to choose and use the black and white shade net?
A: The black and white shading net consists of black and white sides. When covered, with the white side facing up, the white top surface reflects sunlight radiation (rather than occlusion) and cools better than black. The black lower surface has the effect of shading and cooling, which increases the shading rate compared with the all-white shading net. The pores in the middle of the net itself ensure the maximum ventilation rate with the outside world and increase the oxygen supply to the plants in the planting area. The sunshade net woven from high-strength monofilament fibers has high quality and long life. It is an ideal choice for edible mushroom greenhouses, chrysanthemums and other plant greenhouses that are sensitive to light.
Note: There are also all-white shading nets, which are now used more in the breeding and planting of strawberries, which can prevent the crops from growing too long. It can also be spread on the top of the plastic film to separate the strawberry fruit from the plastic film to reduce the occurrence of roasted fruit, rotten fruit and gray mold, and improve the commodity rate.
Q5: Why is there a certain distance between the external sunshade net and the shed film and other coverings, and the cooling effect is better? What is the appropriate distance?
Answer: It is recommended to keep a distance of 0.5-1m between the shading net and the shed surface. The air can flow between the shading net and the shed surface, which can accelerate the heat loss in the shed, and the effect of shading and cooling is better.
If the sunshade net is close to the greenhouse film, the heat absorbed by the sunshade net is easily transmitted to the film and then to the greenhouse, and the cooling effect is poor. The close contact with the shed film prevents the heat from being dissipated, which increases its own temperature and thus accelerates its aging. Therefore, when using the sunshade net, be sure to keep a proper distance from the shed film. After years of experience in greenhouse engineering construction, the shading net or shading cloth can be supported by steel wire directly above the greenhouse. Vegetable farmers who do not have the conditions can put soil bags on the main frame of the greenhouse, and put discarded straw curtains at 3-5 spaces in front of the shed, so as to prevent the sunshade net from sticking to the greenhouse film.