性培育学校羞耻椅子调教h_伦理厨房2性猛交hd_奇米777四色影视在线看_内精品久久人妻无码免费_无码人妻av一区二区三区蜜臀_少妇白浆高潮无码免费区_三年大全免费大片三年大片_2024中文字幕在线高清_免费啪啪一区二区av

Container bag

Lock stitch sewing machines are mainly divided into two categories: shuttle and rotary shuttle. The main models of chain stitch sewing machines are GK8-2, GK68-2, TS01, etc. The edge wrapping stitch sewing machine is mainly GN20-2. Due to the need to sew thick material container bags, important parameters include not only sewing speed, but also sewing thickness, presser foot lifting height, turning ability, etc. Container bag sewing machines are generally large machines, and due to the limitations of their sewing thickness, they are required to have excellent fatigue resistance and sewing stability. In addition, most container bag sewing machines use differential feeding or synchronous feeding, which greatly improves the sewing life of the sewing machine.