Aiming at the 3-layer composite filter paper, this paper studies the influence of the pore size change of each layer on the filtration performance of the composite filter paper under the condition of controlling the total resistance and quantitative constant of the composite filter paper, in order to provide a reference for the structure design of the multilayer composite filter paper. Experiment 1. Experimental materials: Softwood flash dried pulp (pine, hereinafter referred to as ZS), hardwood flash dried pulp (eucalyptus, hereinafter referred to as KS), mercerized pulp (hereinafter referred to as SG), glass wool (hereinafter referred to as BLM). 2. Experimental equipment JA2003 electronic balance, PTI 95568 fiber decomposer, LABTECH ME-255 manual copying device, NORAM arc dryer, YG461E computerized air permeability test
ing-equipment' target='_blank'>tester, CFP-100-A capillary flow aperture Tester, Beckman Coulter LS13320 'Torando' dry powder laser particle size analyzer, 08FB018 multiple-pass test bench, KQ2200E ultrasonic disperser. 3. Experimental method 3.1. Preparation of single-layer filter paper. Pour the decomposed slurry into a hand-made device, slowly add water to an appropriate amount, gently stir for several times, and then vacuum dehydration to form, and then put the copied single-layer filter paper into Dry in arc dryer. 3.2. In the preparation experiment of the 3-layer composite filter paper, the composite filter paper is divided into the first layer, the second layer and the third layer in order along the direction of the mesh surface. First, the first layer of KS/SG slurry that has been decomposed in proportions is prepared according to the preparation process of single-layer filter paper to prepare the first layer of filter paper, and it is dried in an arc dryer, and then the dried filter paper is carefully put back into the hand. In the paper machine, make the area of u200bu200bthe filter paper just cover the net surface of the paper sheet, and ensure that there are no air bubbles between the filter paper and the net surface. Slowly cover the surface of the first layer of filter paper with the second layer of KS/SG slurry after being decomposed in proportion, slowly add water to an appropriate amount, gently stir for several times, and then vacuum dehydration. Put the copied double-layer composite filter paper into an arc dryer to dry, and then carefully re-insert the dried double-layer filter paper into the hand-sheeter so that the first layer of filter paper is attached to the mesh surface and the area of u200bu200bthe filter paper just covers the sheet. Piece of mesh surface. Slowly cover the surface of the second layer of filter paper with the third layer of ZS/BLM slurry that has been decomposed in proportions along the drainage rod. Slowly add water to an appropriate amount, gently stir for several times, and then vacuum dehydration. Put the prepared 3-layer composite filter paper into an arc dryer for drying. 3.3. Determination of filter performance of filter paper The filter performance of filter paper shall be tested in accordance with ISO 16889-1999  (equivalent to GB/T 18853-2002), the multiple-pass method for evaluating the filter performance of filter elements by hydraulic transmission filters. 4. The experimental design ensures that the filter paper has a basis weight of 160 g·m-2 and an air permeability of 200 mm·s-1, and by adjusting the fiber ratio, a single-layer filter paper with an average pore size of 4-11 μm is prepared. The fiber materials of each layer of the 3-layer composite filter paper are: KS/SG, KS/SG, and ZS/BLM. The experiment ensures that the total weight of the three-layer composite filter paper is 160 g·m-2, and the weights of the first to third layers are: 65 g·m-2, 65 g·m-2, 30 g·m-2 and The pore size of each layer is designed under the premise that the total air permeability is 200mm·s-1. The general principle of the design of the pore size 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 to say: d1 ≥ d2 ＞ d3 conditions. Under this principle, first specify the average pore size of the third layer of filter paper, and then change the ratio of the fibers of the first and second layers to adjust the difference between the average pore sizes of the two layers of filter paper. According to this requirement, a total of 4 sets of experiments were designed, and the design requirements for the average pore size of each layer of the composite filter paper sample in each group are shown in Table 1. More about: filter material testing instrument
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