Sack Holding Mechanism: Bag sewing machines for woven sacks come with a sack-holding mechanism to keep the bag in place during stitching. This may include a feed dog system or a bag holder attachment that securely holds the sack and facilitates smooth and consistent stitching. Compatibility with Woven Polypropylene: These machines are designed to handle woven polypropylene sacks, which have unique characteristics such as high tensile strength and woven structure. The machines are equipped with components and settings that accommodate the thickness, texture, and density of woven polypropylene material for efficient and reliable sewing.