|Please be sure that your folding is accurate and
all signatures are perforated. Perforation allows the air in the pile
of signatures to escape when trimming. If signatures are not perforated
it may be necessary to make additional cuts or decrease the pile height.
Either of these will require an additional charge, i.e., additional
cuts increase the time to cut a pile by 30%, thus increasing the cost
to you. Also if we are normally trimming four books in a pile and
it is necessary to decrease it to two, it will increase your cost
by 50%. We will contact you if an additional cost is required.
critical for good trimming. "Kick out" occurs when the
secondary folds are not tucked into the original fold. If this "kick
out" occurs when we trim the sigs it will be trimmed showing
the printing at an angle. It is impossible to correct the problem.
If "kick out" is impossible to eliminate, the printing
on the affected pages can be printed on an angle to accommodate
for a "kick out ". This method is similar to "shingling
Eight and sixteen page signatures of 100# coated or equivalent
stock cannot be folded without creases, cracking and a large "kick
out ", 100# or higher caliper should be single sheet collated.
Our collating requires a "stacking imposition" in which
the signatures stack one on top of each other. Trimming requires
3/16" spine and head trim and a minimum of 5/16" on face
Signature trimming is quoted for all signatures being the same
size. If there are signatures that vary in size it may incur additional
jogging time charge. Please let us know when we are estimating if
there is a variance in your signature sizes. If we notify you at
the estimating time that our trimming is based on an "automatic"
method and your signature or covers are not all the same size your
cost will be increased. The automatic method is at least 50% less
than the regular method.
Perforation of signatures must have 1/8 perforation and 1/8 paper
between perforations. Our collators suckers pull from the bottom.
If perforations are close together they pull down only the bottom
sheet of the signatures and tear it loose. The only alternative
for this problem is to hand collate at a much higher cost.