The superposed structure has needle punched polyester wool as bottom layer, polyethylene film as the middle layer and hot rolled non-woven polyester fabric as the upper layer.

叠合结构为聚酯针刺棉为底层，聚乙烯膜为中层，聚酯热 轧无纺布为上层；

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With the treatment of PSA needle-punched nonwoven fabric in the sulphuric acid solution, the broken strength of PSA fiber decreases slightly and the fineness of PSA fiber gets smaller.

芳砜纶针刺非织造布经过硫酸溶液处理后，纤维断裂强度略有下降，纤维线密度减小； 非织造布的尺寸稳定性很好，而其断裂强力却有明显增加。

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