| 摘要 |
A method and apparatus for making bags or sacks which comprise an outer sack and an inner sack, part of which projects from the mouth end of the outer sack. Tube portions for the inner sacks are applied to a web of material for the outer sack, and the web is made into a tube around the tube portions and divided into the lengths required for the individual sacks. The sacks pass through the apparatus with their mouth end leading, the mouth end of each inner sack being folded inwardly by the amount corresponding to the intended projecting part of the inner sack. The apparatus has a double-belt conveyor for passing the inner sack tube portions over a displaceable plate which initiates the inward fold and which then pushes the folded edge into a second double-belt conveyor to complete the fold and convey the tube portion on to the outer sack web. |
