The sack, for filling with loose materials, has a structured overlap of inner and outer layers with ventilation to allow air to escape during filling

摘要

The sack (1), to be filled with loose materials, is of paper (2) with a plastics coating (102,103) on one or both sides. The paper material has an overlapping zone (5) with an inner (6) and outer (7) paper layer and at least one ventilation opening in the inner paper layer at the overlap. The inner layer has an uncoated zone (11) at the overlap.