... bottom sewing available 4) Sewing method: Chain sewing, over lock sewing Weifang Tonghui is a professional manufacturer in pp ... packaging products, such as pp woven bag, opp bag, pp woven shopping bag, pp woven fabric, pp woven sheet, FIBC ... machines, circular looms, color-printing machines, film-covering machines, bag-making machines, and production & management experience, high technical force, ...