In August 22, 2016, after an article on the truck's home website, "full analysis of the life and cost of Donaldson blue air filter core," we received a lot of feedback, especially the problem of NF nano filter paper. Not only users, but also many colleagues are very interested in this topic.
What's the use of nanoscale filtration?
Why is nanoscale filtration so magical?
What kind of air filtration can be called nanoscale filtration?
There are more and more nanoscale air filters on the market. How do I differentiate them as users?
...
As early as 1970s, the American Donaldson group applied nanotechnology to the field of air filtration in the engine, and introduced the Ultra-Web nano filter paper. The continuous innovation and application for more than 40 years has developed into a series of nanoscale filter paper (ultrafine fiber filter paper) suitable for different application scenes.
In recent years, the diesel engine industry and the corresponding filter industry have released F8, F9 level and even "nano" filter core, because of the six emission standards of highway vehicles and the four stage of non highway emission standards. The filtration efficiency is getting higher and higher (that is, the better the engine protection is, the better) and the long life.
1 what kind of air filtration can be called nanoscale filtration?
According to the latest edition of the international standard ISO/TS80004-2015, the length of the range from 1 nm to 100 nm can be officially called nanomaterials. The filter paper industry, which is larger than 100 nanometers less than 1 micron, is recommended to be uniform or finer. (1 micron =1000 nanometers)
Since we are used to the nano air filtration method, all the methods mentioned in this paper refer to the air filtration made of fine fiber filter paper. For standardization, we must avoid using nanoscale methods in contracts, drawings, especially import and export official texts.
What is 2 nanoscale filtration?
A layer of fine fiber coating is added to the surface of ordinary wood pulp fiber filter paper by electrospinning.
The existence of fine fiber coating can greatly reduce the nominal pore size of the filter paper, greatly increase the specific surface area. More fine particles can be intercepted on the surface of filter paper, and the filtration mechanism will be changed from deep filtration to surface filtration.
At the same time, because of the existence of the slip effect, it seems that the thin fiber coating layer on the surface of the wood fiber layer does not increase the intake resistance of the filter paper, thus achieving the perfect balance between the filtration efficiency and the pressure drop.
What are the advantages of 3 nanoscale filtration?
The first is to substantially increase filtration efficiency (including initial filtration efficiency and full life efficiency), or substantially reduce the number of dust entering the engine.
The overall life filtering efficiency that is generally required from the host plant is 99.9%, to the 99.99% to the 99.99% to the recent Donaldson HD filter paper claimed by Donaldson Ultra-Web filter paper for 99.999%, each time the protection level of the engine has been raised by 10 times.
The second advantage of nanomaterials is to increase the maintenance period of filter elements several times in the environment of fine particles or soot.
Many research and road tests show that the tractive vehicles running on a good road are mostly in the air of the engine, and the diameter of the particles is mostly 10 microns and below, especially the carbon smoke from a large number of diesel engine exhaust. Nanoscale filter paper can accommodate more fine particles and soot because of its large surface area and rising resistance.
Under laboratory conditions, carbon fume was tested on ordinary filter paper and Ultra-Web filter paper. Abscissa is time, and ordinate is the corresponding resistance rise.
The PowerCore air filter, which contains Donaldson Ultra-Web filter paper, runs after 100000 kilometers.
Laboratory tests on the filter cartridge indicate that the resistance is still below the critical resistance.
Condition: a brand heavy truck, traction logistics vehicle, Suzhou to and from Shenzhen.
4 Summary
Nanoscale filter, because of its high efficiency, long life and so on, not only protects the engine but also reduces the stop maintenance time of the terminal users, and has been accepted and accepted by more and more users.
However, the products on the market are mixed, and it is difficult for ordinary users to distinguish whether the specific air filtration products really contain reliable Nanotechnology (fine fiber technology). Nanofibers are difficult to distinguish quickly because of their extremely small diameter. It is believed that the result of brand, word of mouth and self test is a feasible method for the majority of users.
