IBIS     F-100     datasheet

Buckle Folder


The optional F-100 pre-folds sheets before they enter the Smart-binder infeed. The folder may be used either to produce small format books, increase SB page throughput, or reduce input sheet rate.

When using the F-100, then sheets are printed with 4 pages on each side (instead of the normal 2 pages on each side when not pre-folding). These 8-page sheets are then folded by the F-100 across the middle ('buckle'-folded) before they enter the SB and are folded again in the opposite direction by the SB plow-folder.

F-100 buckle folder
F-100 cross-folder unit used directly before SB infeed

For example: to produce A5 (Digest 5 ½" x 8 ½") books, print oversize A3 sheets (or oversize 11 x 17"). These sheets must enter the F100 short-edge leading. The folder then folds the sheet in half to give an oversize A4 (or oversize 8.5" x 11") section with the folded edge leading. These folded sections then enter the Smart-binder and are processed normally thereafter into finished A5 (or 5 ½" x 8 ½") books.

To produce A4 (or Letter - 8 ½ x 11") books, print oversize A2 sheets (or oversize 17 x 22"). These sheets must enter the F100 short-edge leading. The folder then folds the sheet in half to give an oversize A3 (or oversize 11 x 17") section with the folded-edge leading. These folded sections then enter the Smart-binder, and are processed normally thereafter into finished A4 or 'letter' size books.

Since sheets are folded into sections before entering the Smart-binder, and books can only be made from whole sections, it is only possible to make books with pages in multiples of 8-pages when using the F100 folder.

Folded sections are more bulky than flat sheets, so this technique may also reduce the maximum number of pages in the book.

F-100 buckle folder flow diagram
Sheet flow through the F-100 folder

The folding process may be deactivated when it is required to pass 4-page sheets through the F-100 without folding. The F-100 folder may be fitted with optional anti-static bars to reduce the static charge on the sheets delivered to the Smart-binder.

When using ISG gluing together with pre-folded sheets, then a second cold-gluing nozzle must also be installed in the folder, option FGS-100, (to place a line of glue inside the folded sheet).

The F-100 enables the max web speed to be increased to about 150 metres/min or, if running from a sheet feeder the maximum page throughput can be increased. The F-100 also allows the minimum paper weight to be reduced to approximately 40 gsm (at reduced web speeds).