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IBIS’s unique ‘ISG cold-gluing’ process produces
a “stitchless” book which has better lay-flat qualities
than a wire-stitched booklet, as illustrated in the photo below. The
lay-flat difference is less pronounced when making thin booklets.
Booklets with ISG cold glue (left) and conventional
stitching (right)
The ISG cold-glue ‘nozzle’ applies a row of cold-glue ‘dots’
(or a continuous glue line) to the inside of each folded sheet as
it passes through the Smart-binder folder. Sheets are then collected
on top of each other (on the saddle) and pressed together tightly
when they reach the stitching station (the stitching heads are inhibited
when cold gluing, or replaced with a pressing ‘anvil’).
The many advantages of ISG cold-gluing over conventional wire-stapling
include:
- ISG glue gives higher page pull strength on the outer and inner
sheets
- Note that the paper bond strength when using ISG gluing is linked
to the integrity of the paper surface. Higher strength results
from more absorbent papers. Certain toners may weaken the bond
strength if applied to the same area as the ISG glue (the sheet
fold)
- ISG gluing results in a tighter fold, particularly on thicker
books. This is because wire stapling tends to ‘open up ‘
the book and the moisture in the cold glue softens the paper fibers
and helps give a tighter ‘set’ to the fold
- The ISG gluing process allows the number of pages in the book
to be changed between minimum and maximum on-the-run without any
adjustment (wire stitching requires stitch head pressure adjustments)
- ISG gluing allows the book format size to be changed without
adjustment (wire stitch heads may have to be moved to a different
position when changing book lengths)
- The ISG cold-glue is a “maintenance-free” system which
is easy to operate than wire stitch heads
- Cold-glued books can be recycled more easily than books containing
wire staples
- Glue binding avoids any child safety (finger damage) issues
relating to the edges of wire staples
- Glued books can sometimes be mailed directly, unlike wire-stapled
books
- ISG cold glue costs approximately the same in consumable material
costs (on a ‘per book’ basis) as wire stitches (and
much less than hot-melt EVA adhesives used for conventional ‘perfect-binding’)
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