In order to solve the recycling problem of waste fibers, the nonwoven wall cloth was prepared with waste wool fibers and low-melting-point polyamide fibers as raw materials by combing into a net and hot-pressing method. The effect of fiber length, hot pressing temperature, mass fraction of the waste wool fibers, volume density, thickness of materials, and thickness of the rear air layer on the sound absorption properties were studied by single factor experiments. Under the optimized technological conditions, the sound absorption coefficient was above 0.91 and the noise reduction coefficient was 0.56. Then, the sound absorption mechanism was analyzed. In order to meet the fire resistance requirements of materials in the construction industry, by the orthogonal experiments, range analysis, and variance analysis, the optimal process conditions were as follows: potassium fluotitanate concentration of 8%, treatment time of 40 min, and treatment temperature of 80°C. The limit oxygen index of the nonwoven wall cloth was 32.5%. The nonwoven wall cloth had good sound absorption and flame retardant properties.

中文翻译：

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废纤维非织造墙布的吸声、热、阻燃性能

为解决废纤维的回收利用问题，以废毛纤维和低熔点聚酰胺纤维为原料，通过组合成网、热压的方法制备了无纺墙布。通过单因素实验研究了纤维长度、热压温度、废毛纤维质量分数、体积密度、材料厚度、后空气层厚度对吸声性能的影响。在优化的工艺条件下，吸声系数在0.91以上，降噪系数为0.56。然后分析了吸声机理。为满足建筑行业材料的耐火要求，通过正交试验、极差分析、方差分析，最佳工艺条件为：氟钛酸钾浓度8%，处理时间40 min，处理温度80℃。无纺墙布的极限氧指数为32.5%。非织造墙布具有良好的吸声和阻燃性能。