Folding Our folding department has three continuous feed MBO Folders, one 23" x 36" and two 26" x 40" with Double Gate Fold and Knife Fold attachments. Our In-Line System uses various attachments to provide folding, perforating, scoring, gumming, and side seam gluing of mailers all in-line. We now offer fugitive glue (aka "boogie glue") both in-line for folding and off-line for piece attachment. We recently added a Vijuk Mini Folder to this department.