... , singeing, calendaring technology, Sync-Ring 2.best bonding strength,no fiber releasing Stitching :We sew the filter bag strictly. Our ... . 2. non-woven- fabrics-made, adopts singed and calendered, no secondary pollution by deciduous fiber.Technology adopts:1.hot-melt ... 99%. Special filter bagOil absorption bag: made of non-woven fabric and oil absorption material, has filter and oil absorption function ...