Multi-Wall Paper Sack

Multi-Wall Paper Sack refers to an industrial packaging bag made of two or more layers of paper bonded or sewn together, typically used for packaging powdered or granular bulk materials such as cement, chemical raw materials, flour, and feed. The number of layers is generally 2-6; the outer layer is often kraft paper, and the inner layer may include a PE film or aluminum foil to enhance moisture-proof and leak-proof performance. It is commonly used in bulk commodity exports. Note: 1) Select the number of layers and lining based on material characteristics; for highly hygroscopic materials, a PE lining is required. 2) Load capacity is usually 20-50 kg, and the bag breakage rate standard must be specified. 3) During transportation, protect against moisture and snagging; pallets or stretch film are recommended. Difference from 'paper-plastic composite bag': the latter contains a plastic woven layer, offering higher strength but at a higher cost. Difference from 'kraft paper bag': a single-layer paper bag is not a multi-wall paper sack. Foreign trade contracts must specify the number of layers, grammage, dimensions, printing, and packaging method.