Spunbond nonwoven fabric manufacturing method

In the manufacturing method of non-woven fabrics, the spunbond method has obvious advantages in manufacturing technology, product performance and production efficiency, etc., so that it has achieved rapid development that has attracted worldwide attention in the past 20 years. At present, about 40% to 50% of the production of non-woven fabrics adopts the melt spinning method (including the spun bond method, the melt blow method and the composite method of the two), and the melt spinning production method accounts for The proportions are 50% in the United States, 37% in Europe and 41% in Japan. According to the data, it can be seen that advanced countries use melt spinning as the main production method of non-woven fabrics. In the most developed North America in the 1998s, the spunbond nonwoven market accounted for 54% of the total nonwoven market.

The research on spunbond non-woven fabrics has been carried out by DuPont and Freudenberg in the United States and Europe at the same time since the late 1950s. Later, in the late 1960s, countries around the world began to produce spunbond nonwoven fabrics. Japan started in the 1970s, and the Asia-Pacific region began production in the mid-1980s with the introduction of technology.

The important reason for the rapid development of the spunbond method is that it uses synthetic polymers as raw materials. This method uses the principle of chemical fiber spinning. During the polymer spinning process, continuous filaments are made by spraying and forming a web and then directly bonded. Non-woven fabrics, the manufacturing method is very simple and fast, compared with dry non-woven fabric processing technology, a series of cumbersome intermediate processes such as fiber curling, cutting, packaging, transportation, mixing, carding, etc. are eliminated. The most significant effect of mass production is to reduce the cost of spunbond products, stabilize the quality, and have a strong market competitiveness. It can enter the textile, paper and film market in various applications such as disposable and durability. Secondly, due to the large amount of polypropylene used as the main raw material for spunbond nonwoven fabrics, its many advantages in terms of price, processing, and production costs have also greatly promoted the continuous development of the spunbond nonwoven fabric industry. In addition, the spunbond nonwoven fabric products have excellent mechanical properties, and its tensile strength, elongation at break, tear strength and other indicators are better than dry, wet, meltblown nonwoven fabrics, especially in recent years spunbond The rapid development in the scale of production lines, technology and equipment and product market expansion has greatly expanded the application fields of spunbond nonwoven fabrics.

The biggest difference between the spunbond production process and chemical fiber spinning is the use of air drafting and direct web formation, so the drafting of the spunbond method becomes a core technical issue. The previous drafting used mechanical drafting, fiber monofilament It's thick and unevenly spread. At present, air drafting technology has been used in spunbond production equipment in various countries around the world. Due to the different air drafting methods, there are three different forms of spunbond production lines, including tube drafting, wide slit drafting, and narrow slit drafting. Stretch out.

Spunbond nonwoven fabric technology has always been to improve the capacity of the production line and solve the problems of nonwoven uniformity, covering, rough feel, etc., to improve the strength, softness, uniformity and comfort of spunbonded nonwoven fabric , Hygroscopicity and other properties.

Fine Danhua spunbond nonwoven fabric can directly improve the softness and comfort of spunbond nonwoven fabric. However, the fine denaturation of the spunbond method has a technical bottleneck. For example, fine denaturation can increase the number of fibers per unit area of the spunbond nonwoven fabric, and the "bonding point" between fibers will increase The product will also become more uniform and the coverage will increase.