| Spunlace is a promising and high-end technology in the field of nonwoven fabric. Spunlaced nonwovens are widely used in medical and health fields all over the world, which will have a good market in China. However, the low value-added, innovation-poor and species-single are hampering the development of the product. Spunlaced nonwoven fabric being made from silk fiber is the enhancement and expansion for spunlaced technology.Silk fiber which is a high-end textile raw material has many excellent properties like good strength and elongation, thinness and softness, smoothness and elasticity. Its main ingredient is silk peptide that contains 18 kinds of beneficial amino acids. Silk, the queen of fibers is not irritating to human skin, which has been favoured for thousands of years. However, because of the characteristics of poor water absorption and large mass specific resistance, silk is easy to produce static electricity, which seriously affect high-speed carding and productivity. In this paper, a large number of silk fibers hydrophilic modification experiments were done to solve the problems. the best hydrophilic modification program was determined by comparison and analysis of experimental results. The performance of the modified silk fibers were tested and analysed. Experimental results show that the modified silk fibers whose hydrophilicity significantly improved and specific resistance sharp decreased , satisfy the raw materials requirements of the nonwoven production process. Besides, the quality of silk spunlaced nonwoven is good and all performance indicators are in line with the standard FZ / T 64012.2 - 2001 "Spunlace Nonwovens Part 2: coiled material used in sanitation."This paper discussed silk spunlaced nonwoven technology, detailedly analysed the force and movement track of fibers in carding, and researched the effect on web of parameter of distance between the water-jet and fibers, spunlaced pressure, diameter of water-jet hole, and speed rate in spunlaced process. The mechanism of entanglement among fibers by squirt impact were studied through analyzing silk spunlaced nonwoven web-forming and consolidating technology, as well as understanding the properties of raw materials thoroughly. The optimum processing parameters configuration and technical problems were also investigated. Moreover, the properties of mechanism, the performance of absorbency and the capability of permeation were tested, respectively. As the areal density of silk spunlaced nonwoven materials increased, the thickness and fiber entanglement also increased. Because of the fiber entanglement increased, tensile properties, bending rigidity and water absorption increased, however, permeability (air permeability, liquid permeability and coverstock wetback) performance were worse. As the water-jet pressure increased, fiber entangled more tightly, and silk spunlaced nonwoven material binding index(BI) improved, which resulted in the thickness of the material thinning, tensile properties and bending stiffness increases, absorption properties (water absorption) and air permeability worse and run-off, liquid strike-through time and coverstock wetback better.The experiment was carried out by single regulator method, and all process schemata were evaluated by Borda excess method. The results revealed that viscose fiber is superior to polyester as a auxiliary material of silk spunlaced nonwoven. Meanwhile, results also revealed that the sample C has the best performance, the best fibers mixture ratio and the process parameters more scientific. The specific program is that mixture ratio of silk and viscose fiber was 50 to 50, areal density of web was 40g/m~2, alternating impacted surfaces every twice for processing and the four pressures were 35 bar, 40 bar, 40 bar, 50 bar, and producing speed was 38m/min. |
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