Seite 89Alterations reserved Stand 05/2008
Operating manual T700/T800.1 - en
7.4 Punch Perforation
Continuation
The trend to produce more and more books by the perfect-binding method at lower cost places an
ever increasing demand on manufacturers to develop machinery and ancillary equipment to make
further progress towards this end.
The new MBO-punch perforating device fulfils the requirement by providing a considerably improved
adhesive surface for perfect-bining.
Instead of the commonly used type of perforation, i.e.- - - - - - - - - - , slots are punched into the
folded sheets, i. e. just before the last fold.
folded section
These slots provide a larger opening in the
spine of the collated sections and allow the
glue to penetrate easily and reach every
single sheet.
spine of sheet not spine of heet after punch
punched perforation
The folded sheets are gathered and fed into hte perfect binder in the usual manner.
The spine will not be roughened and grooved, however, only the adhesive will be applied.
Present perfect binding methods, where the spine is completely removed, have the desadvantage
that the adhesive reaches only the very top area of the sheet edge and, therefore,
has only a limited strength.
gathered sheets fold completely adhesive reaches only
removed top area of sheets
In the perfo-binding process, where folded sheets have standard perforations in the spine,
the openings are too small to allow the glue to penetrate thoroughly, and it does not always reach
the inner sheets.
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