Experiment on the effect of pore size change on the filtration performance of filter paper

In this paper, for the three-layer composite filter paper, the influence of the pore size change of each layer on the filtration performance of the composite filter paper was studied under the condition of controlling the total resistance and quantitative value of the composite filter paper, in order to provide a reference for the structural design of the multi-layer composite filter paper. Experiment 1. The experimental raw materials were flash-dried pulp of softwood (pine, hereinafter referred to as ZS), flash-dried pulp of hardwood (eucalyptus, referred to as KS), mercerized pulp (hereinafter referred to as SG), glass wool (hereinafter referred to as BLM). 2. Experimental instruments: JA2003 electronic balance, PTI 95568 fiber disintegrator, LABTECH ME-255 manual slicer, NORAM arc dryer, YG461E computer air permeability testing-equipment' target='_blank'>tester, CFP-100-A capillary flow aperture Tester, Beckman Coulter LS13320“Torando”Dry powder laser particle size analyzer, model 08FB018 multiple pass test bench, model KQ2200E ultrasonic disperser. 3. Experimental method 3.1. Preparation of single-layer filter paper Pour the decomposed slurry into the hand-type machine, slowly add water to an appropriate amount, stir gently for several times, and then vacuum dehydration to form, and then put the single-layer filter paper into the machine. Dry in an arc dryer. 3.2 In the preparation experiment of 3-layer composite filter paper, the composite filter paper is divided into the first layer, the second layer and the third layer in turn along the direction of the mesh surface. First, prepare the first layer of filter paper from the first layer of KS/SG slurry that has been decomposed in proportion according to the preparation process of single-layer filter paper, put it into an arc dryer to dry, and then carefully put the dried filter paper back into the hand. In the machine, make sure that the area of ​​the filter paper just covers the mesh surface of the sheet, and ensure that there are no air bubbles between the filter paper and the mesh surface. Slowly cover the surface of the first layer of filter paper with the decomposed second layer of KS/SG slurry along the drainage rod, slowly add water to an appropriate amount, stir gently for several times, and then vacuum dehydration to form. Put the prepared double-layer composite filter paper into the arc dryer to dry, and then carefully put the dried double-layer filter paper back into the hand dryer, so that the first layer of filter paper is attached to the mesh surface and the area of ​​the filter paper just covers the filter paper. Sheet mesh. Slowly cover the surface of the second layer of filter paper with the degraded third layer of ZS/BLM slurry along the drainage rod, slowly add water to an appropriate amount, stir gently for several times, and then vacuum dehydration to form. Put the prepared 3-layer composite filter paper into an arc dryer to dry. 3.3. Determination of filtration performance of filter paper The filtration performance of filter paper is tested according to ISO 16889-1999 [3] (equivalent to GB/T 18853-2002), the multiple-pass method for evaluating the filtration performance of filter elements for hydraulic transmission filters. 4. The experimental design is to ensure the quantitative 160 g filter paper·m-2, air permeability 200 mm·Under the premise of s-1, by adjusting the proportion of fibers, the average pore diameter of 4~11 was prepared.μm single-layer filter paper. The fiber raw materials of each layer of the 3-layer composite filter paper are: KS/SG, KS/SG, ZS/BLM. The experiment guarantees a total weight of 160 g of 3-layer composite filter paper·m-2, the basis weight of layers 1 to 3 respectively: 65 g·m-2, 65 g·m-2, 30 g·m-2 and a total air permeability of 200mm·The aperture of each layer is designed under the premise of s-1. The general principle of pore size design of each layer is that the average pore size (d3) of the third layer of filter paper is the smallest, and the average pore size (d2) of the second layer of filter paper is not greater than the average pore size (d1) of the first layer of filter paper, that is, it satisfies: d1≥ d2 > d3 condition. Under this principle, the average pore size of the third layer of filter paper is first specified, and then the ratio of fibers in the first and second layers is changed to adjust the difference between the average pore sizes of the two layers of filter paper. According to this requirement, a total of 4 groups of experiments were designed, and the design requirements for the average pore size of each layer of composite filter paper samples are shown in Table 1. More about : Filter Material Testing Instruments

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