How do paper bags work?

Paper bags come in two main types: open-mouth bags and valve bags, each designed for specific applications. An open-mouth bag is a tube-shaped bag with a sealed bottom, leaving the top open for filling. These bags are ideal for manual or semi-automated filling processes and are commonly closed after filling with stitching, adhesive, or tape to secure the contents. Valve bags, on the other hand, are pre-sealed on both ends and include a valve through which the product is filled. The valve mechanism allows for efficient filling, particularly in automated processes, and ensures minimal spillage or contamination. Both types are widely used across industries for packaging powdered or granular materials, offering versatility and reliability.