It is usually use crochet form for weaving selvedge on gripper-projectile looms,but it leads to weft density double and thickness increased.

• 片梭织机上的布边通常采用钩边形式,但钩边形式使布边的纬密增大,厚度也增加,造成布边与布身不相适应,给生产造成困难。