国产成人亚洲午夜电影,亚洲精品无人区在线观看,中文字幕精品一区二区三区无码,国产成人欧美综合在线影院

PP industrial yarn production of one-step and two-step method. PP industrial yarn general production process for the extrusion, stretching and winding. The two-step method has horizontal cluster stretching and vertical single-spindle stretching. The breaking strength of PP industrial yarn can be up to 7.0CN / dtex and the elongation at break can be controlled at about 20%. One-step production of PP industrial yarn fiber breaking strength of 7.0CN / dtex above, elongation at break can be 16% -18%