The unqualified air filters are caused by the following three reasons:

1. Air filter material: filter paper is failed. Air filter material used – filter paper quality indicators in the pore size, air permeability, quantitative and other parameters on the quality of air filter products have a very big impact, it can be said that the basic reason for the air filter unqualified resistance is the filter paper failed. Air filter manufacturers in the procurement of raw materials, there is no awareness and means of quality control, blindly pursue to reduce procurement costs, the use of cheap filter paper is the main cause of air filter product quality unqualified. Most air filter manufacturers do not have the ability to inspect raw materials into the factory, resulting in the use of substandard quality filter paper to produce unqualified air filters.

2. Air filter manufacturing process is not reasonable. In addition to the original filter air filter efficiency and pore size of the filter paper, but also with the filter product processing parameters, such as increasing the filter fold, will increase the filter area, increase the filter of the original filter efficiency, but the original filter filter Clear efficiency increases, will cause the original resistance of the filter increases, so take a reasonable processing technology is also the key to producing qualified air filter.

3. Air filter product production process is relatively simple, low threshold, air filter products also belong to low-cost auto parts consumables, the market demand is larger, making the manufacturers rush, air filter manufacturers product quality assurance capabilities and control of the lower level , There is no raw and auxiliary materials into the factory inspection and finished products factory inspection equipment and tools, there is no quality control system.