Does the increasing resistivity of air increase the sound absorption properties of woven fabrics?4 answersIncreasing the resistivity of air does enhance the sound absorption properties of woven fabrics. Research indicates that woven fabrics' sound absorption coefficient can be improved by increasing the airflow resistivity, which is influenced by factors like density, thickness, porosity, and yarn arrangement. Moreover, the correlation between air permeability and sound absorption coefficient in multilayer porous fabrics shows an inverse relationship, indicating that higher resistivity leads to better sound absorption performance. Additionally, the study on stitch-bonded non-woven samples developed from recycled woven fabric selvedge wastes demonstrates that structures with high fiber density, which inherently have higher resistivity, exhibit better sound absorption properties at higher frequency levels. Therefore, increasing the resistivity of air indeed plays a crucial role in enhancing the sound absorption capabilities of woven fabrics.
How are nonwoven fabric produced?5 answersNonwoven fabrics are produced using various methods outlined in the provided research contexts. One method involves applying voltage between a collector and nozzles to jet a solution and form fibers, which are then collected to create the fabric, with static electricity elimination to meet specific criteria. Another approach includes moving an electrified belt through different formation steps to produce layers of fabric with varying polymer concentrations, enhancing strippability from the collector. Additionally, a method utilizes spinning molten aromatic polysulfone resin from a nozzle, extending it with high-speed fluid, and collecting it on a moving member within a specific distance range. Furthermore, a technique involves depositing fibers in a deposition area, preconsolidating the web, and final consolidating it between rollers with alternating engagement levels to control consolidation and preconsolidation.
How are nonwoven fabric produced by making veils?5 answersNonwoven fabrics can be produced by making veils through various methods outlined in the research papers. One approach involves carding to create veils with different finishes suitable for medical and hospital use. Another method includes forming nonwoven fabrics by bonding layers of synthetic fibers, shrinking them with hot air after heat treatment. Additionally, the production of spun fleece from endless filaments involves spinning filaments with natural ripples, solidifying them with a hot fluid, and utilizing multiple component filaments with specific arrangements. Furthermore, a method for producing nonwoven fabric, particularly for filter media, includes melting raw materials, spraying them onto a support layer to form spacers within the fabric. These diverse techniques highlight the versatility and innovation in nonwoven fabric production for various applications.
Does hemp fiber in woven fabrics improve the sound absorption performance of the fabric?5 answersHemp fiber in woven fabrics significantly enhances the sound absorption performance of the fabric. Research indicates that waste hemp fibers possess excellent sound-absorbing properties, with a high sound absorption coefficient, making them valuable for sound absorption applications. When combined with biodegradable polymers like PLA in nonwoven fabrics, hemp fibers contribute to creating sound-absorbing panels with high absorption coefficients, especially when arranged in specific layer orders. Studies on hemp-based composites show that the fiber's porous nature and environmental friendliness make it an ideal material for reducing noise, with sound absorption coefficients reaching up to 1 for specimens with 10 mm thickness. Additionally, needle-punched nonwoven fabrics made from hemp fibers exhibit superior sound absorption coefficients when blended with other natural fibers, emphasizing the importance of fiber proportion and nonwoven thickness.
Can sound absorption properties of woven fabric reach the non-woven fabrics's sound absorption properties?5 answersThe sound absorption properties of woven fabrics can be improved to reach the sound absorption properties of non-woven fabrics. Different techniques and factors can be employed to enhance the sound absorption performance of woven fabrics. For example, the addition of an air gap between layers of woven fabric can significantly improve sound absorption at low to medium frequencies. Additionally, the use of multilayer composites, combining woven and non-woven fabrics, can enhance the sound absorption efficiency of the material. Furthermore, the use of specific weaving densities and thicknesses, as well as the optimization of the combination of woven and non-woven fabrics, can further improve the sound absorption properties of the composite material. Therefore, with the appropriate design and optimization, woven fabrics can achieve comparable sound absorption properties to non-woven fabrics.
Can chicken fiber be used as a non-woven fabric?4 answersChicken feathers can be used as non-woven fabrics for various applications such as sound insulation, composite reinforcement, and oil spill cleanup. The feathers are processed into fibers and formed into mats with different properties such as density, thickness, and weight per unit area. The non-woven feather fiber composites have been found to have good tensile strength, flexural strength, and compressive strength, making them suitable for low load bearing and economic applications. They also exhibit excellent sorption properties for hydrophobic substances and can be used to clean up leaked oily substances. Additionally, the mechanical properties of chicken feathers make them suitable for the production of textile yarn and composite reinforcements. Overall, chicken feathers have the potential to be a cost-effective and sustainable alternative for non-woven fabric applications.