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According to the quality supervision department, the filter was originally used to filter out harmful impurities so that the engine can work normally under various conditions and achieve the required service life. In the case of products with unsatisfactory raw filter efficiencies, dust and impurities that are harmful to the engine cannot be effectively filtered out. This can cause early wear of the engine of the motor vehicle, reduce its service life, and endanger the engine or even cause accidents. The spot check found that the total of 7 samples were unqualified, involving Handan Zhengzheng Filter Co., Ltd., Handan Shengfa Filter Factory, Handan City COSCO Filter Factory, Handan Dacheng Filter Manufacturing Co., Ltd. the company.
There are two main reasons for unqualified: First, the quality of the filter paper for the main raw material for the filter is not good, the hole diameter is too large, the thickness is uneven, or the fold of the filter paper is too small and the fold is too small. Due to the filtering effect, or the strength of the filter paper is too low, after a certain flow rate of air is applied, a crack occurs and the filtration efficiency is greatly reduced. Second, the adhesive process in production is not well mastered, or the quality of the adhesive itself is not good, so that the filter paper and the end cap can not maintain a sealed state so that dust flows through the gap. The selection and processing technology of filter paper and filter paper adhesive technology are two key quality control points in the filter production process. Some manufacturers, in order to reduce production costs, purchase cheaper unqualified filter papers and adhesives, or have short bonding time, too little or inconsistent brushing, will cause the original filtration efficiency to be unacceptable.
In addition, the product tightness test items of the two sets of diesel filter paper filter elements were unqualified. The reason for this item being unqualified was that the product was not sealed tightly, or there was a gap between the filter paper and the end cap. After such a product is assembled into a filter assembly, although the original resistance may be acceptable, the original filtration efficiency item is definitely unqualified and the resulting damage is the same as the product with an unsatisfactory initial filtration efficiency.
The Quality Supervision Department reminds buyers to purchase invoices, product certifications, product inspection reports, and quality warranty vouchers when purchasing and reloading filters in order to understand the quality of the product and the quality of the returned product, warranty, or complaint.
In the second quarter of 2010, the Anhui Provincial Bureau of Quality Supervision organized provincial supervision and spot checks on filter products. Samples were collected from 60 cities in the three cities of Chongqing, Hefei, and Wuhu. 51 groups passed the inspection, and the sampling pass rate was 85%. Among them, 57 samples were collected from Yan, and 49 were qualified. The qualified rate of sampling in Handan was 86%. The unqualified projects are mainly concentrated on: Raw Filtration Efficiency and Sealing Test.