Sub-station

Cross non woven fabric/ Cambrella Fabric

The effect of hot-rolling and bonding of non-woven fabrics on the web and fiber structure is proved by exploring the combination of experiments

by:Sunshine     2021-03-04
Author: Date: 2019-12-05 07:34:30 Hits: 1948 calendar bonding effect on the web and the fiber structure of the electron microscope can be clearly seen hot-rolled adhesive bonded web of the post, The integrity of the fiber at the bonding point is not destroyed, but a certain amount of deformation has occurred. The degree of deformation is related to the hot rolling temperature and pressure. At the same time, a certain number of fibers are cut during the bonding process. This is mainly related to the matching of hot rolling temperature and pressure. Low temperature and high pressure will increase the number of sheared fibers. Research on the thermal bonding process of polypropylene fibers shows that about 10% of the crystals—the most unstable crystalline part and the amorphous part—melt and become flowable. The stable crystal part is toughened under the action of temperature and pressure. Therefore, the more stable crystals that do not melt, the better the integrity of the fiber after hot-roll bonding is maintained. After hot-rolling and bonding, the bonding only occurs at the fiber crossover point or the engraved roll point. The unbonded area maintains the original shape and performance of the fiber, so the hot-rolled bonded non-woven fabric has a good The softness, breathability and elasticity of the product. In the thermal bonding process, due to the thermal and mechanical action of the fiber, its microstructure will change to a certain extent, and the performance of the fiber will inevitably change to a certain degree. Research on the thermal bonding process of polypropylene keto fibers shows that the web will shrink at a temperature of 150°C, as shown in Figure 8-2, which is the result of the loosening of molecular chains in the amorphous region of the fiber. At higher temperatures, the tiny defective parts of the product begin to melt, causing the fibers to shrink suddenly and rapidly. The degree of molecular chain de-orientation in the amorphous region is related to the bonding temperature. The higher the bonding temperature, the greater the degree of molecular chain de-orientation. The change of the fiber crystallinity after thermal bonding is not only affected by the bonding temperature, but more importantly by the cooling rate. When thermal bonding is below the melting point, the crystallinity increases with the increase of bonding temperature, as shown in Figure 8-3. Because as the bonding temperature increases, the molecular movement in the amorphous region becomes easier and easier, so that each crystal region grows, reflecting the increase in the average crystal grain size in the direction of the crystal plane. When the bonding temperature exceeds the melting point, the fibers in the bonding zone are melted. If they are cooled rapidly, the relative crystallization rate will slow down and the crystallinity will decrease. Related tags: Previous: How to set specifications for the specific application of permeable geotextiles in highways (graphics)
Custom message
Chat Online 编辑模式下无法使用
Chat Online inputting...
Dear friend, there are too many consultants at present, and you may not be able to reply in time. You can describe what you want, and we will reply you in time. Contact email:lauren@nonwovenfactory.com Whatsapp&Tel:+86 152 6086 7307