Application of non-woven fabrics in vegetable production
Non-woven fabric is also known as harvest cloth. It is a long fiber non-woven fabric, which is a new covering material with good air permeability, hygroscopicity and certain light transmittance. Non-woven fabrics are divided into thin, thick and thick types, usually expressed in grams per square meter, such as 20 grams per square meter of non-woven fabrics, 30 grams of non-woven fabrics per square meter, and 40 grams of non-woven fabrics per square meter etc. The thickness of the non-woven fabric is different, the water permeability, shading rate, air permeability are different, and the covering method and use are also different. Generally, 20-30 g/m2 thin non-woven fabrics have high water permeability and air permeability, and are light in weight. They can be used for covering open fields and floating surfaces in greenhouses and greenhouses. They can also be used for small open arched sheds, greenhouses, and greenhouses. It can increase the temperature by 0.7~3.0℃. 40-50g/m2 non-woven fabrics for greenhouses have low water permeability, large shading rate and heavy weight. They are generally used as thermal insulation curtains in greenhouses and greenhouses. They can also be used to cover the outside of the small sheds instead of straw curtains to enhance thermal insulation. . This kind of non-woven fabric for greenhouses is also suitable for shading seedlings and cultivation in summer and autumn. Thickened non-woven fabrics (100-300 g/m2) replace straw curtains and straw thatch, and carry out multi-layer covering in greenhouses and greenhouses together with agricultural film. According to research, the non-woven fabric for covering the greenhouse has a significant thermal insulation effect than the straw curtain, and it is lighter in weight than the straw curtain and easy to manage. It is expected to achieve mechanized or semi-mechanized uncovering.
Non-woven fabrics have long been widely used in Japan, the United States, the Netherlands, Canada and other developed countries. China has not introduced non-woven technology for a long time. At present, there are few types and specifications of products, and the price is high. Compared with similar foreign products, there is a certain gap in quality. At the same time, the research and promotion of covering technology has not been done enough. Therefore, , so far the promotion area is not large. However, with the improvement of non-woven production technology and the further improvement of covering technology, non-woven fabrics will be widely used in the development of off-season vegetable cultivation.
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There are different types of , mainly non-woven company and flame retardant non woven fabric.