1. Multi-layer kraft paper bag: use two or more layers of kraft paper for machine processing to make a bag shape, use polyester thread for stitching at the bottom, and then use hot air paper for heat sealing.
2. Paper-plastic composite bag: also known as a three-in-one kraft paper bag. The outer layer is kraft paper and the inner layer is a plastic PP woven bag. It uses EVA, PP, PE, and other raw materials for high-temperature composite treatment. After completion, the bottom treatment is carried out according to different types.
3. Square bottom open-mouth bag: basically the same as multi-layer kraft paper bag. After using the machine to make semi-finished products, manually fold the bottom to form a square bottom, use glue to bond the bottom, and then perform drying treatments such as hot air and drying.
4. Square bottom valve bag: The basic production process is basically the same as the square bottom open-mouth bag. The valve bag treats the mouth and bottom in the same way and adds a bell mouth to the mouth for filling materials.
The raw materials of kraft paper bags are mainly kraft paper, PP woven fabric, polyester thread, and so on.
