熔噴發(fā)非織造布的發(fā)展歷史（The development history of melt blown nonwovens ）

1、熔噴發(fā)非織造布的發(fā)展歷史2（The development history of melt blown nonwovens 2）The following focuses on the technical characteristics of continuous injection equipment made in our country:General continuous melting and spraying equipmentThis is a parallel melting nozzle and nozzle length and cloth rolling shaft, w

2、eld width is approximately equal to the international general layout of the equipment, can be seen in Table 1, because some meltblown equipment manufacturing enterprises is just involved in meltblown equipment manufacturing, real climate in China before the period of meltblown industry is Beijing ba

3、osite as well as c.a.f and grand Institute Cooperative Enterprise grand Best, their production equipment accounted for about 80% of the domestic equipment has been started (enterprise except). For their development of the technical characteristics of melt blown equipment, a few analysis:A: use blowe

4、r blower instead of air compressor, so energy consumption is lower.B: uses a quenching device: melt extruded from a die, by both sides of hot stretch after spraying, after a quench quenching device with side blowing to, as shown in Figure 1 (this is the schematic structure and the actual differences

5、), the fiber forming in the cold, have a certain degree of crystallinity and orientation the degree of change, the meltblown fibers without the strength of the past, continuous length is greatly improved, the property has a certain degree of filament, fiber is soft, fineness uniformity and stability

6、 are improved, the finished product is more fluffy, appearance and good drape.Fig. 1 Schematic diagram of quenching deviceC: developed dual mode head melt spraying equipmentC.a.f company uses a dual-mode head in meltblown equipment supply Zhejiang Jianmin company, make the production line production

7、 doubled, 90% of its products exported to the United States, said: in the process of the filtering products fully meet the requirements of international market.Reciprocating continuous spraying equipment developed by JiarongThis is Shanghai Goodwin Co. Ltd. in the transformation of intermittent filt

8、er meltblown equipment, a patent for invention creation. The utility model uses a 0.25-0.3 meter length spray nozzle and is vertically positioned with the take-up roller, and the constant tension roller and the receiving net in front of the melting nozzle are installed on the reciprocating vehicle w

9、hich can move laterally and reciprocally. So, when the molten melt extrusion nozzle, hot air from the high speed stretch and alignment receiving net injection, thus forming a strip of meltblown fiber web 250-300 mm wide, winding and the constant tension coiling roller. With the nozzle continuously s

10、praying the fiber onto the receiving net, the coiling roller is continuously reciprocating and coiling, forming a strip fiber network, reciprocating, dislocation, and stacking in a certain reentrant angle, and the whole spray filter material is formed. The width can be adjusted according to the widt

11、h of 1.0-2.0 meters in need. In addition, the winding cloth on both sides of the hypotenuse cause (caused by strip meltblown reciprocating winding) and thick (due to reciprocating moment of pause), located by the receiving network and the constant tension coiling roller between the edge cutter remov

12、ed.The reciprocating continuous melting and spraying equipment is said to have the following advantages:A) product specifications change easily:The width of the product is determined by the lateral reciprocating movement of the reciprocating vehicle and the effective width of the receiving network.

13、Therefore, as long as the receiving network has enough width, it is necessary to adjust the moving distance of the reciprocating vehicle. The maximum width Goodwin design is 2 meters, 1 meters, 2 meters can be adjusted conveniently.The constant tension roller can adjust the coiling speed according t

14、o the required weight of the product, so as to make the product meet the requirement by changing the density of the net fiber on the receiving net.B) product quality is stable:Because of the long nozzle length, the distribution of melt is easy to be uneven in general continuous spraying and spraying

15、 equipment. The temperature difference, pressure difference, airflow turbulence and dynamic change at any point of the nozzle will produce uneven products and defects. Therefore, the management must be very strict, in order to ensure product quality, you must also use high melting index section (100

16、0MI or more). And the use of reciprocating continuous spray equipment, because the nozzle is short, not easy to produce the above problems, but also because of the reciprocating stack uniform action, even if the nozzle in the individual jet hole problems, after stacking will not form defects.C) can

17、reduce costs:Because of these advantages, this equipment can reduce the requirements on raw materials, according to the Goodwin company reflects: the factory use ordinary spinning chip (40MI) can also be produced in line with the requirements of meltblown products of high quality, users are satisfie

18、d with the quality of the plant, which can reduce the production cost.This equipment is continuous spraying equipment faults, productivity is generally lower, to achieve the same capacity, plant area of 30-40% is larger than the general continuous melt blown equipment (considering two head reciproca

19、ting continuous melting spraying equipment case); in addition, previously mentioned, reciprocating continuous melt blown out processing equipment the product, need to go through the cutting edge, which will cause the decrease of yield. But the advantages of this device are obvious and should be paid

20、 attention to.3 development and application of melt blown productsSource: ( - the development and technological progress of Chinas melt blown nonwovens 2_kevin_ Sina blogOur country has been developing melt blown nonwoven products for more than 10 years. In the past 10 years, many special products h

21、ave been developed. Some of the fields of application are listed below:Thermal insulation productsBecause of the melt blown nonwoven fiber belongs to superfine fiber, light, soft, warm, and melt blown nonwoven fiber gap between small and large void ratio, permeability is very superior, which determi

22、nes the meltblown nonwoven is of excellent thermal insulation material.Melt blown heat preservation materials have developed rapidly in China, and many domestic companies use melt blown fibers for this purpose. Tianjin TEDA eco cotton is actually made of melt spun fiber. Figure 2 is TEDA ecological

23、cotton form, it is a special structure of battings laminated interval between two layers of meltblown fabric, which has more air gap, the meltblown thermal materials, better thermal performance. Tianjin TEDA groups eco cotton has become a national brand. This material has been favored by the militar

24、y logistics department, some units have been using melt blown fiber thermal insulation materials, complete sets of clothing, equipped with army soldiers.Figure 2 eco cottonIn addition to clothing as wadding warmth, meltblown fiber wadding can also be wrapped in gas pipeline, pipeline or other storag

25、e devices as the appearance of adiabatic insulation layer effectively, not to heat or cold.American 3M company has developed a series of thermal insulation products for various purposes. Its core technology is based on melt blown fiber as the basic material. But if all meltblown fiber insulation is

26、very good at the beginning to melt blown flocculus after a period of time after use, easy compaction, no air gap, the insulation effect will be greatly reduced, so it must be coarse denier polyester fiber is mixed into a certain amount of meltblown fiber, the flakes remain between the air uniform di

27、stribution gap. The company has developed an ingenious technology that is allegedly capable of doing so.Filter materialBecause of its fine fiber diameter, large specific surface area, small porosity and high porosity, the melt blown nonwoven fabric is very suitable for liquid solid separation or gas

28、 solid separation. In air filtration, it can be used for sub high efficiency filtration. Such as insurance and medical masks, masks, filter dust, bacteria and other harmful particles, as well as air conditioning, car air filter and engine air filter, especially when the electret meltblown fibers aft

29、er treatment, the filtration efficiency of air filter can be more than 99%, even up to 99.999%, can be suitable for electronic equipment clean workshop and other high the requirements of air purification places, 2003, in order to prevent SARS infection, meltblown nonwovens had a great success, becau

30、se the electret meltblown nonwoven fabric processing as a mask or a mask can effectively prevent the intrusion of bacteria and viruses.In the past, some highly demanding air filtration commonly used micro glass fiber filter materials, in recent years, research shows that: glass fiber easily break of

31、f, fall off, harmful to human beings, and may even lead to cancer. WHO IARC fiberglass classified under the IB class, that is, carcinogenic substances. In addition, glass fiber can not be added to electrostatic charge for polarization, so with the passage of time, the application of melt blown filte

32、r material will be more and more widely.Oil absorbing materialChina is a big oil consuming country, and it has the second place in the world. Chinas marine transport industry has developed rapidly. The occurrence of oil spill and the discharge of oily wastewater often occur, seriously polluting the

33、water quality, especially in coastal ports, bays and coastal waters, which have serious consequences for the ecological environment.Polypropylene meltblown nonwovens structure because of its ultrafine fibers, with hydrophobic, light weight, water absorption rate is 0.01%, insoluble in oil and acid a

34、nd alkali resistance and other characteristics, the oil absorption quantity can reach 20 to 50 times its own weight, with oil absorption speed, after long-term floating on the water surface deformation, displacement the performance of water and oil, can be used repeatedly by the characteristics of l

35、ong-term storage, this field is welcome.Europe and the United States, Japan and other countries have been widely used spray absorbing materials and plant oil management, marine environmental protection, sewage treatment and other oil spill pollution and governance, and have specific regulations, req

36、uirements for ships and harbor must be equipped with a certain number of meltblown oil absorbing materials to prevent environmental pollution.Our country has attracted extensive attention in related aspects in this regard, some have begun to have said to harbour some kind of meltblown batts, oil suc

37、tion gate, suction belt and other products, to prepare the necessary for some other hotels, and even oil products including household use has gradually spread. But for ships and seaports,A certain amount of melt blown oil absorption material must be configured to prevent contamination of the environ

38、ment.Medical and health productsThe use of meltblown nonwovens and other composite materials can be made of medical supplies, usually meltblown nonwovens and breathable, breathable membrane complex, but more commonly used is spunbond and meltblown fabric composite is SMS, SMMS etc. The composite clo

39、th spunbond nonwovens mainly possess enough strength, and meltblown to prevent human with bacteria or viruses invade the blood, waste liquid, the composite product can make a one-time or limited time use of protective clothing, surgical gowns, masks, surgical towel, bed sheet, curtain hole room etc.

40、 These products can be anti-static, anti alcohol, plasma, water, oil, dirt, acid, alkali, flame retardant, anti ultraviolet and other special treatment. The front has mentioned meltblown nonwovens can enhance the barrier, shielding bacteria and viruses, dirty liquid through the electret treatment, m

41、ade use of the composite cloth its protection products can prevent the cross infection between patients and medical staff, but also can prevent the infection between patients and healthy people.In the 2003 SARS epidemic in China, blocking and shielding meltblown nonwovens are widely recognized, application of meltblown nonwovens in the medical and health aspects of the highly regarded, promoted the rapid development of meltblown nonwovens, with the rapid development of Chinas medical and public heal