天津市红星半导体器件厂子1958年就开始生产人造革风筒,供广大矿山、隧道工程的通风换气之用。风筒材料为聚氯乙烯人造革,即以棉花和玻璃丝混纺成纱、织成布,然后在正反两面涂上聚氯乙烯(简称“指标布”);也有在棉布的正反两面涂聚氯乙烯的(简称1号布);也有在棉布的一面涂聚氯乙烯的(简称2号布)。后两者光滑些,轻些,但机械强度低些。用户可根据使用条件及性能要求选购。风筒的缝制工艺有两种,一是线缝的, Tianjin Red Star semiconductor device factory in 1958 began producing artificial leather hairdryer for the general mine, tunnel ventilation and ventilation purposes. The material of the hair dryer is PVC artificial leather, that is, cotton and glass wool are blended into yarn and woven into a cloth, then PVC is coated on the front and the back (referred to as “index cloth” for short), and the front and back sides of the cotton cloth PVC (referred to as the cloth No. 1); there are also coated on the side of the cotton PVC (referred to as cloth No. 2). The latter two are smoother and lighter, but the mechanical strength is lower. Users can choose according to the conditions of use and performance requirements. Hair dryer sewing process in two ways, one seam,