SMS non-woven composite technology advantages and disadvantages of online

In the production technology of SMS nonwovens, according to the general classification method, can be divided into the compound, the line outside the compound two kinds of online process is obtained. But now there's a new kind of compound method, namely the melt-blown line by adopting the method of hot rolling of spun-bonded and melt-blown composite, because this method combines with online compound, the line outside the compound of the same characteristics, and difference with the characteristics of the composite, the line outside the composite online, it is recommended that the categorization of SMS nonwovens basically divided into the compound, the line outside the compound and melt-blown line online hot rolling composite three categories. Here are the three kinds of process were discussed. Online composite process online composite process definition online composite is SMS non-woven composite can be on the same production line of spun-bonded and melt spray equipment, is the so-called one-step SMS non-woven ( Online compound) 。 SMS non-woven fabrics are spread in a movement on the net curtain of spun-bonded, melt-blown, spun-bonded layers of composite fiber, and then after hot rolling mill of hot glue, finally forms through winding machine SMS non-woven non-woven fabric. SMS non-woven fabrics made full use of the advantages of two spun-bonded, melt-blown technology, spun-bonded layers to increase the strength and wear resistance of the product, make up the weakness of low melt-blown fabric strength, melt-blown spinning fiber reaches 1 ~ 4 microns, can improve the uniformity of the product and the blocking performance, can make up for the method of spun-bonded nonwoven fabric the defects of poor uniformity. The advantages of online composite one-step production SMS non-woven composite process has several advantages. ( 1) Can be adjusted according to the requirements of the product performance, spun-bonded layers and the spray layer structure proportion, in order to ensure that in the case of high hydrostatic pressure resistance, the product has good air permeability; ( 2) Due to flexible adjustment of spun-bonded layers and layers of melt-blown structure proportion, in the fierce market competition, is beneficial to reduce cost, occupy the favorable position; ( 3) Can gram weight small products, such as the machine can produce about 10 g/m2 of SMS non-woven products; ( 4) Product has good uniformity, good appearance of the whole; ( 5) Soft, if USES the fine denier S, the production of SMS non-woven fabrics feel more soft, better comfort. ( 6) Products with high hydrostatic pressure and the filtering resistance, particularly suitable for medical applications; ( 7) High production speed, big capacity, for example, Mr SM - offers MMS production line, the production of 18000 t/a, maximum mechanical speed can reach 600 m/min; ( 8) Suitable for big order, and fully play the advantages of online composite. Composite process faults online composite process online also has its weaknesses, basically has the following several aspects. ( 1) Investment big, 1 the SMMS line investment in 200 million yuan or so; ( 2) Long construction cycle is long, equipment manufacturing, 1 SMMS production line equipment manufacturing cycle in about 10 months or so, and installation and debugging, need more than 10 months, basically can say so, on a online composite SMS non-woven production line need nearly two years; ( 3) Online composite product, basically stereotypes in thin g major in about 10 ~ 70 g/m2, if you want to produce thick type products, to increase the gram weight of the M, such will sacrifice S production. Online SMXS production line, for example, thanks to the output of melt-blown spinning viscose production vary too much, the production line mainly is suitable for the production of melt-blown content only 2 ~ 3 g/m2 products, limiting the improvement of the whole production line speed. If melt-blown a thicker layer of product, production speed is greatly reduced. So in the original X increased 1 welding nozzle, formed the SMMS line, improve the production speed, made the production of 9000 t/a 12000 t/a, increase the economic benefit of enterprise. Increasing melt spray nozzle is a solution to the output matching, but SMMS or more M arrangement will increase the cost of investment, and make the production more a lack of flexibility in production. For the method of spun-bonded nonwoven status quo of our country and the characteristics of the product market in various fields, there is a big contradiction. ( 4) Because of S and M using different raw materials, jet orifice diameter and length to diameter ratio is different, so in production, due to welding nozzle clogging and change frequency significantly higher than that of spun-bonded technology, production of cloth when blocking phenomenon is more serious, and will cause the S and M die cannot be replaced at the same time, have a big impact on normal production. Especially when deep color SMS non-woven products, this phenomenon is more serious, thus forcing manufacturers to special strict melt-blown materials. ( 5) Online SMS composite nonwovens production line, the distance between the die head and into the net machine can be adjusted, but into net net curtain from the perspective of melt-blown die head can not be adjusted, affect the SMS the regulation of the permeability and the uniformity of non-woven products. ( 6) Online SMS composite nonwovens production line, because the spinning die, so in the production of color conversion, can cause more transition cloth to produce, is not conducive to enterprises to reduce costs, improve the economic benefit. ( 7) Online composite production line especially suitable for large production order, and for small production orders it is hard to adapt.