Overlockingstitch is a term in the clothing industry, which refers to the thread and its stitches used in the process of "edge copying" in clothing production. Because the main purpose of wrapping is to prevent the cut yarn from falling off, the strength of wrapping is not high. In order to save cost, the copying edge is generally made of polyester mesh yarn, which is not twisted and has lower strength than sewing thread. It is different from the general sewing thread in that the sewing thread is made of polyester filament without twisting, while the sewing thread is made of polyester staple fiber with twisting.
"hemming" is also called "hemming", which is a garment industry term, and English is "hemming". In the process of clothing production, because polyester and other materials are generally synthetic fibers, the silk thread at the edge seam of clothing materials will be scattered because of the high hardness after cutting, so it is necessary to copy the edge: use a special edge copying machine to copy a circle of edges at the edge seam to prevent the silk thread in the cloth from being scattered. This also plays an aesthetic role.