Workflow for heat sealing and sewing Bag mouth cleaning (alternative) –>cutting knife bag mouth trimming–> heat sealing of inner bag (heating of 4 groups of heating blocks. PTFE sealing belt makes the heating blocks not directly contact with the bag in order to protect the appearance of the bag from adhension with the heating blocks)–>roll processing –>wrinkled paper tapes –> bag sewing machine: sewing of external bag