Study On Process And Property Of Bi-Component Spunbonded And Spunlaced Superfine Fiber Nonwovens

Bi-component spunbonded and spunlaced superfine fiber nonwovens are made from polymer through spinning, web formation with spunbonded process and splitting, tangling with spunlaced process. Spunboned and spunlaced technology gets the attention of domestic and foreign researchers with its short process, high production speed and superior product performance. While spundbonded and spunlaced technology has been put into production, now study of the technology is in its infancy, particularly the study document to the design of spunbonded and spunlaced process is still empty, the domestic product structure and properties have the distance with the abroad also, and the test of product splitting rate is not feasible. Therefore, the article makes the design of spundbonded and spunlaced process, gives the study to product performance and structure, and analyzes the domestic and abroad product, indentifies the air flow method to test the splitting rate, and provides the rich data for the product quality improvement and the process design.First of all, the article identifies the optimization solutions of spunbonded and spunlaced process, and makes the study to structure and performance of spunbonded and spunlaced material. Though cooperation with the factory, we determine the process optimization about influence rules of spunbonded process for fiber, web formation process for product uniformity and spunlaced process for product performance. By analyzing the SEM photographs, we obtain that the fiber is bi-component orange-type hollow fiber, and the material has the characteristic of surface splitting after sponbonded process. Comparison of domestic and foreign materials, we find gaps in quality of bi-component orange-type hollow fiber, structure of web and splitting and entanglement situation of material.Secondly, the article researches the influence rules of spunbonded and spunlaced process on the product performance. Through tests of fiber crystallinity, diameter and strength, we find fiber crystallinity increases as the quench temperature increased, fiber diameter and tensile strength decreases as the quench temperature and the tensile stress increase. Using the method of variance analysis to analyze the significance level of tensile stress, reciprocator amplitude and web formation speed that affect the density uniformity of nonwovens, and the data show that reciprocator amplitude has significant effect. By performance tests of nonwoven made in different experimental conditions of the spunlaced pressure, we find the properties of materials increase firstly and then decrease with the spunlaced pressure increasing, and get the optimum process parameters. We determine that the spunlace dpressure distribution is rising firstly and then descending by comparison the performance of different materials made in different pressure distribution.At last, the paper comes up with the unique splitting way of the material—splitting on the surface for the first time. Then basing on the increasing of specific surface when the bi-component fibers are split up into superfine-fibers, the relationships among splitting rate, specific surface and gas-feed-rate are analyzed relying on the increasing of specific surface, the formula between splitting rate and gas-feed-rate is established, and identifies the feasibility of this method in practical application by experiment.