Study On The Relationship Between The Process Parameters Of Spunlaced Non-woven And Its Moisture Permeability

With the increasingly widespread applications of non-woven materials, and the improvement of people's material living standards, people have higher and higher requirements on non-woven products. In this medical, cosmetic, health and other areas, products made of non-woven materials have higher requirements on moisture absorption and moisture retention performances. Although the domestic and foreign scholars have studied on moisture absorption and desorption properties of fabrics,but these studies were largely confined to raditional textiles (woven fabric, knitted fabric), the reports about the moisture absorption and moisture retention performances of non-woven materials are rare. Therefore, study of the moisture absorption and desorption properties of non-woven materials is especially important.For textile materials, the impact of its moisture/moisturizing properties there are two main factors: fiber's characteristics and structural characteristics of fiber material, while the latter is decided by the material production process. The topic took samples made on the Aquajet T6616 small-scale spunlace machine as the research object. In order to clarify how to improve the performance of its moisture, we studied the changes of spunlace process parameters (spunlace pressure, spunlace process distance) how to influence non-woven's moisture performance. We analyzed the fiber entanglement structure of non-woven's surface, and studied the relationships involving wetting-proliferation area, wet bulk quantity and time. Main research contents include:(1) Make the Preparation Program of non-woven materials. On the Aquajet T6616 small-scale spunlace machine, we changed spunlace pressure (80×10~5Pa, 100×10~5Pa, 120×10~5Pa), and spunlace processes distance (42mm, 39mm, 34mm) to make sample.(2)By observing the fiber entanglement structure of non-woven in the scanning electron microscope and testing non-woven's structural characteristics, we analysed the influence of the process parameters on structural characteristics of spunlaced non-woven. (3)We studied the moisture absorption process of non-woven materials, and then, we tested and analysed the water retention and moisture regain of non-woven materials. (4) We analysed the wettability of non-woven materials, and using high-speed photography instrument and Image-plus professional image analysis software, we tested and analysed the wetting the proliferation performance of non-woven materials. (5) We studied the wet bulk process and mechanism of non-woven materials, and tested its wet bulk performance, the we identified the impact factors of the moisturizing properties of non-woven materials, and find out the key factors.This experimental results show that:(1)From the scanning electron micrograph of non-woven materials, it can be found that spunlaced non-woven materials present network structure, and fibers in the spunlaced non-woven materials render the form of ?;(2)Within a certain range, with the increasing of spunlace pressure or the decreasing of spunlace process distance, fiber and fiber knob more closely, the fiber web is more uniform, and the mesh structure of spunlaced non-woven is clearer.(3)Spunlaced non-woven has good moisture retention, its water inhibition rates all can be up to 100% or more. Water inhibition rate was positively correlated with the porosity or thickness, and it was negatively correlated with the weight per square meter of fabric.(4)The wetting and diffusing properties of non-woven materials follows the rules of the wetting of rough fabric and multi-component fiber fabric, and its water marks and time curve showed a trend of "fast-rising→slow-rising→steady". While, within a certain range, with the increasing of spunlaced pressure and the decreasing of spunlace process distance, the wetting and diffusing propertieof non-woven is better.(5)By analyzing the experiment of carry-off wet ,we found that: the performance of carry-off wet of spunlaced non-woven can be pressed by casual performance characteristic parameters of the wet bulk acceleration a 'and the initial rate of wet bulk b', and the major factor affecting a 'is the thickness, that affected b' is the porosity. The determination of the key factors in non-woven moisture retention performance has a positive sense for product design and development, and can improve the quality and grade of moisture retenting non-woven product, and further enhance its market competitiveness.