Method for forming heat seals

摘要

In a bagging machine for producing industrial bags, an improvement comprising a sealing head compartmented on the back side, and included is a plate valve to block at least certain of the compartments during the initial part of the sealing cycle. During the sealing cycle, a heated air stream exiting from the sealing head is controllably channeled to occur at defined regions, e.g., opposite the bag gussets and lap seam, and then by opening the valve, the channeling is terminated and heat is applied uniformly to complete the bag end sealing.