Graphic Design & Printing TechnologyFiltration system:- Filtration and ventilation systems are commonly found in
press areas to overcome ink misting and flying. A spray, fog or mist of ink is
visible in the air as a result of ink misting and flying. Ink mist suppressors are
used to overcome this. They are typically electrically charged devices that
repel the charged ink back to the ink rollers. Electrical grounding of the press
and air conditioning the press room helps to remove ink mist from the air.
Dampening system:-Most web offset presses use either conventional or
continuous dampening system. Some web offset presses are capable of short
run waterless printing.
Inline finishing
Combination folding:- Most web presses are equipped with one or more folders
which fold work into signatures as the web leaves the press. There are three
basic types of folders- former folder, jaw folder and chopper folder. All three
folding devices are often incorporated to form a combination folder. A former
folder folds the web by pulling it over a triangular shaped former board. This
action makes to fold the web along its length. Additional folds are after former
folder are made with jaw and chopper folders. A jaw folder folds the web
across its width by allowing it to travel around a cylinder equipped with a
tucker blade which forces the paper into a jaw on an opposing cylinder. In
chopper folder, each signature is forced between two rotating fold rollers that
makes the final fold.
Inline stitching:- It is the last but one operation of the delivery unit. When all
the sections of the printed web have been gathered, the book or the magazine
is stitched with its cover. Generally two or three stitches are sufficient for
book of any size.
Single knife rotary trimmer:- Cutting is the last operation of the delivery unit.
Here, each book is trimmed at the edges. The sequence of trimming is foredge,
tail and finally the head. Single knife rotary trimmers are designed for accurate
clean cut, high speed trimming of the press products.
Three knife trimmer:- Three knife trimmers use two parallel knives and one
right angle knife to trim three sides of the printed publication inline.
Numbering tower:- This part is designed for sequential numbering on one side
of the web or both sides of the web simultaniously. It is used for numbering
coupons, newspaper inserts, security products, lottery products and direct
mailing pieces.
Pattern perforators:- This operation scores, slits and perforates any desired
pattern inline without tying up a printing unit.
Pattern gluer:- This gluer prints glue inline for the production of envelopes,
return post cards, lottery and game-card products and spot gluing in trim areas
for binding assistance.