The general fuel filter adopts a star filter paper folding structure. Inside the fuel filter, the folded filter paper is connected with both ends of the plastic or metal filter, and after the sewage enters, the outer wall of the filter passes through the layer. The filter paper is filtered and reaches the center, and clean fuel flows out. This type of filter paper generally uses corrugated fuel filter paper.
The higher-end engine uses high-precision filter paper, spiral fuel filter, unlike the star fuel filter, its filter paper is wrapped in the center tube, the space utilization is high, and it can accommodate larger in the same space size. The filter area is generally 3 times that of a star filter. After the slop oil enters, it is directly filtered through the filter paper and then flows out, and the foreign particles are retained in the filter paper groove. This fuel filter has superior performance and can make fuel filtration more accurate.
The main research contents of high-precision filter paper: 1 pulp material selection; 2 process parameters determination; 3 crease scraper selection; 4 wet strength agent selection; 5 anti-water rubber material application.
The technical specifications of high-precision fuel filter paper are shown in Table 1:
The production process is shown in Figure 1:
1. Process ratio:
(1) 50% of rainbow fish coniferous wood pulp;
(2) Bowater (Poishui) softwood 50%;
(3) The amount of wet strength agent: 5% (for dry pulp);
(4) Surface water repellent dosage (6% concentration): 20%
2, process parameters are determined
In order to balance the paper strength, the pore diameter, and the air permeability, the pulp must be subjected to the necessary beating. Appropriate degree of enthalpy is beneficial to ensure the bonding force between the fibers and to reduce the maximum pore size. After repeated comparisons, we believe that when the pulp enthalpy is 17°SR, the paper forming indexes are the closest to the requirements, and the final parameters of the pulping are 17°SR and the wet weight is 9-10g.
3, creping scraper selection
The filter paper wrinkles are mainly to increase the effective filter area of ​​the filter element, and the paper has a large number of grooves to accommodate more dirt and extend the life of the filter. The thickness of the creping blade and the wrinkle angle are determined to determine the wrinkle depth. After the actual production of the paper sample detection, when the thickness of the creping blade is 1.0 mm and the creping angle is 25°, the wrinkle depth of the filter paper satisfies the requirements.
4, anti-water compound application
Other filter papers are coated with a water-resistant resin on the surface to ensure sufficient strength and water resistance of the paper to ensure subsequent processing of the filter. However, the high-precision filter paper has been wrinkled before the applicator. If the surface sizing technique of the general filter paper is used, the water-repellent compound is re-impregnated, and the wrinkles will disappear or become shallow. Therefore, how to apply water-resistant rubber on paper becomes the key to the production of high-precision filter paper. After many considerations, the surface water spray was applied to the water-resistant rubber compound, and good results were obtained.
4. Features of high-precision filter paper:
(1) The surface of the filter layer is uniformly sprayed with a layer of high-strength and oil-resistant latex layer, which increases the strength, stiffness and oil resistance of the fuel filter paper, thereby improving the filtration precision and life;
(2) The drying air drying method is adopted to maintain the gas permeability and bulk of the filter paper, and the dryness is greatly improved after drying.
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