Skip perforator

Apparatus for all-over and skip perforation of a ply for a multiwall bag moving between the ply unwind stand and the multiwall tuber comprising:

• an idler roll and a back-up roll spaced from each other to permit the moving ply to pass from the idler roll to the back-up roll;
• the idler and back-up rolls being driven by friction from the moving ply;
• a perforator pin roll positioned parallel to the idler and back-up rolls and adjacent to the back-up roll, the ends of the perforator pin roll being connected to the ends of the idler roll to permit the perforator pin roll to pivot about the idler roll;
• the perforator pin roll being driven from the idler roll at the speed of the idler roll;
• and
• means to move the perforator pin roll into and out of contact with the moving ply against the back-up roll;
• whereby the all-over perforation of the ply can be interrupted for predetermined periods to provide no perforation in areas of the ply where interply pasting will occur.