Preparation And Physical And Chemical Properties Of Tubular Wet Nonwovens

< p > the experimental plan of this subject is simple, < a href= "//www.sjfzxm.com/news/index_c.asp" > raw material < /a > demand is not very high, and the cost is low. The production of tubular nonwovens different from traditional wet nonwovens can not only meet the requirements of the domestic market, fill in the gaps in our technology field, but also provide a complete set of technology for the development of this high-tech material in China, so that the relevant fields can use this technology to improve the grade of their products and promote the technological development in the application field. Xu Zhiwei < /p >
< p > < strong > expert opinion < /strong > /p >
< p > < strong > burette accuracy ratio increase performance index < /strong > < /p >
< p > through experimental steps, it can be seen that manual operation is adopted in this paper, but manual operation is difficult to accurately grasp the speed of pipe extraction, thereby affecting the appearance uniformity of fiber tubes, and can not optimize the products. The appearance of products is rough and uneven. Therefore, I suggest that we can use the burette to mix the fiber, adhesive and water, so that the accuracy of the test will be improved, and the performance indexes of the products will also be improved to varying degrees. Wang Ran, Professor of science and engineering, Nanjing University, "/p".
< p > < strong > Enterprise comment < /strong > < /p >
< p > < strong > the influence of suction and external force should be included in < a href= > //www.sjfzxm.com/news/index_c.asp > detection > /a > /strong > /p >.
< p > the permeability and filtration efficiency of the tubular wet nonwovens shown in this paper decrease with the increase of the thickness of the product, which is consistent with the low consumption and high production mode, and the longitudinal strength increases steadily with the increase of the binder concentration. But I think we should further study the influence of the size of suction and external force on the experimental products, because these two indicators have great influence on the quality of products in the actual production process. Li Keran, technical manager of Yu Li nonwoven company, /p.
< p > < strong > experimental operation, the key data < /strong > /p >
< p > wet nonwovens are widely used in our daily life. The shape of tubular wet nonwovens is different from that of traditional wet nonwovens. Besides, it has other properties such as filtration, insulation, heat resistance, washability and adsorption that other wet nonwovens do not possess. It can make use of its unique shape to expand the application field of wet nonwovens. For example, it can be used as a filter material in the automotive industry; it can be used for automobile parts to filter effectively the dirt in the air and the greasy pollutants in the carriage, and to keep the parts clean. The pipe type wet nonwovens can also be used as an edible oil filter material for filtering edible oil in frying food, and can be used as an adsorbent material in the industrial production field, and its good washing and corrosion resistance can be used in workshops, warehouses and other places. Tubular wet nonwovens have gradually become "new pacesetter" in Nonwovens wet process in recent years. < /p >
< p > < strong > experimental operation, the key data < /strong > /p >
< p > wet nonwovens are suitable for wide variety of fiber materials. Wood pulp fiber is also one of the suitable raw materials for wet nonwovens. It has good dispersibility and adhesion. This topic selects wood pulp fiber as raw material. Wood pulp fiber is a kind of plant fiber. There are two main sources of holes in the cell wall of plant fiber. One is the pores existing in the original plant fiber itself. The two is the irregular pores and gaps produced by the removal of lignin and hemicellulose in the process of pulping, bleaching and beating. Therefore, wood pulp fibers belong to porous materials, which can be used to characterize wood pulp fibers by means of porous materials. < /p >
< p > < strong > data analysis to determine the best process < /strong > < /p >
< p > air permeability is less than a href= "//www.sjfzxm.com/news/index_c.asp" > nonwovens < /a > there exists pressure difference on both sides, which has the performance of passing through air. Under specified pressure, the air volume per unit area per unit time is called air permeability of nonwovens. The unit is mL/cm. S. < /p >
< p > from the experimental data, it can be seen that the concentration of adhesives has little effect on the permeability of the experimental products. The permeability is related to the thickness of the product. The thicker the product is, the smaller the permeability. The permeability of tubular wet nonwovens depends on their thickness. We can fix the thickness of products by the needs of our practical life. < /p >
< p > air filtration efficiency is distinguished according to the size of penetrable ions and the quantity of filtered dust. In most cases, the efficiency of filtration depends directly on the following factors: air resistance, wind speed, filtration area and so on. < /p >
< p > from the experimental data, it can be seen that the concentration of the binder has little effect on the filtration efficiency of the test product, and the thickness of the product has an effect on the filtration efficiency of the product. The larger the thickness is, the lower the filtration efficiency is. It can also be seen that the size of filtration resistance can not indicate the efficiency of filtration, the increase of filtration resistance may increase or decrease the filtration efficiency, and the filtration efficiency will not change with the change of filtration resistance. < /p >
< p > through the performance test of the experimental samples, it is known that the tubular wet nonwoven material has better strength and filtration efficiency, and its permeability depends on the thickness. The greater the amount of binder in a certain range, the greater the strength of the product, but not much on the filtration efficiency and air permeability. The thicker the thickness of the product is, the greater the resistance is, the worse the permeability is, and the lower the filtration efficiency. Through many tests, it is found that the excessive amount of binder affects the appearance of the product, the handle is hard, the product is yellowed, the pore size of the product becomes smaller and the resistance increases, thus affecting the permeability of the product. The factors affecting the appearance of products include external force and fiber concentration. When the fiber concentration is too high, the fibers are difficult to disperse in the water, and they are formed in the process of suction, resulting in uneven and uneven surface. Therefore, fiber concentration must be between 0.01%~0.05% of wet net forming fiber concentration and moderate suction. < /p >