The superposed structure has needlepunched 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；
2
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.