Introduction to the manufacturing method of spunbonded nonwoven fabric
In the non-woven fabric manufacturing method, the spunbond method has obvious advantages in terms of manufacturing technology, product performance and production efficiency, and it has achieved remarkable development in the past 20 years. At present, about 40% to 50% of the production of nonwovens adopts the melt spinning method (including the spunbonding method, the melt-blown method and the composite method of the two), and the melt spinning production method is used in the total output of each region. The proportion is 50% in the United States, 37% in Europe, and 41% in Japan. It can be seen from the data that the advanced countries use the melt spinning method as the main production method of nonwoven fabrics. In the most developed North America in the 1998s, the market for spunbond nonwovens accounted for 54% of the total nonwovens market. Printed Shirts,Digital Print Shirt,Custom Made T Shirts,Printed T Shirts For Men Shaoxing Shanhe garments co.,ltd , https://www.sx-sanhe.com
The spunbonded nonwoven fabric research was developed and produced industrially by DuPont and Freudenberg in the United States and Europe since the late 1950s. Then in the late 1960s, the world began to produce spunbonded nonwovens. Japan began in the 1970s, and the Asia-Pacific region began production in the mid-1980s with technology introduction as its starting point.
The important reason for the rapid development of the spunbond method is that it uses synthetic polymer as the raw material. The method utilizes the principle of chemical fiber spinning, and the continuous filaments in the process of polymer spinning are directly bonded after being formed into a net after spinning. Non-woven fabrics, the manufacturing method is very simple and fast, compared with the dry non-woven fabric processing technology, eliminating a series of cumbersome intermediate processes such as fiber curling, cutting, packing, transporting, mixing, combing, etc. The most significant effect of batch production is to reduce the cost of spunbond products, stable quality, and strong market competitiveness. It can enter the market of textiles, paper and film in various applications such as disposable and durable. Secondly, since the spunbonded nonwoven fabric uses polypropylene as a main raw material in a large amount, it has many advantages in terms of price, processing, production cost, etc., and greatly promotes the continuous development of the spunbonded nonwoven fabric industry. In addition, the spunbonded nonwoven fabric has excellent mechanical properties, and its tensile strength, elongation at break, tear strength and the like are superior to dry, wet and meltblown nonwovens, especially in recent years. The rapid development of production line scale, technology and equipment, and product market expansion has greatly expanded the application of spunbonded nonwovens.
The biggest difference between the spunbonding process and the chemical fiber spinning is the air drafting and direct web forming. Therefore, the drafting of the spunbonding method becomes the core problem of the technology. The previous drafting is the mechanical drafting method, the fiber monofilament. Thicker, uneven laying. At present, the world's spunbond production equipment has adopted air drafting technology. Due to different air drafting methods, there are three different forms of spunbonding production lines, including tubular drafting, wide slit drafting, and narrow seaming. Stretching and so on.
The spunbonded nonwoven technology has always been to improve the production line and solve the problems of uniformity, hiding and rough feeling of the nonwoven fabric to improve the strength, softness, uniformity and comfort of the spunbonded nonwoven fabric. , hygroscopicity and other properties.
The fine-denier spunbonded nonwoven fabric can directly improve the softness and comfort of the spunbonded nonwoven fabric. However, the fine-spinning of the spunbonding method has a technical bottleneck. For example, the fine-denierization can increase the number of fibers per unit area of ​​the spunbonded nonwoven fabric, and the "bonding point" between the fiber and the fiber increases. Products will also become more uniform and coverage will increase.
Due to the disadvantages of melt blowing, the production speed is lower than the spunbonding method, the fiber strength is poor, the abrasion resistance is not good, the production efficiency is low, and the production cost is high. Therefore, Exxon combines the basic characteristics of spunbond and meltblown with different lengths and lengths, combines meltblown nonwoven fabric with spunbonded nonwoven fabric technology, and develops spunbond and meltblown composite production technology. A set of production equipment can produce spinning. The viscous-meltblown composite non-woven fabric product combines the continuous spunbonded filament with the meltblown nonwoven fabric into an integrated structure, making full use of the advantages of the two technologies and the characteristics of the non-woven fabric, so that the product has a vertical and horizontal strength and uniform appearance. The properties of the sex and feel are at an ideal level, and its good liquid repellency, heat retention, filterability and moisture permeability are more popular than traditional spunbond nonwovens.