久久天堂AV综合合色,国产片av在线观看,欧美激情一区二区,wc凹凸撒尿间谍女厕hd

With the advancement of industrial technology, the field of industrial textiles continues to expand and consumption continues to increase. The polypropylene industrial yarn developed in recent years has the advantages of cheaper raw materials, simple production process and unique performance compared with other industrial filaments. Its high-strength, high-modulus, chemical resistance, acid and alkali resistant properties can be comparable to those of polyester and nylon, and even exceeds the strength of polyester and nylon filament in chemical resistance.

At present, polypropylene industrial yarn has become one of the most competitive products in the industrial field. In recent years, China is currently organizing the development of follow-up products of polypropylene industrial yarn to make them play a role in industrial applications.