Reference Book
down and create a fold. The location of the fold can be adjusted by moving the
fold guide slightly. Light weight papers fold better on buckle folders.Other finishing operations
Punching
Punching is an operation in which rectagular or specially shaped holes are cut
in paper by forcing a metal rod through the paper to remove the stock. Punching
is used for such applications as producing holes needed to do spiral binding.
Automatic punching machines are used for this.
Drilling, Slotting and Cornering
Drillingis a piercing operation that uses a revolving hollow drill bit with very
sharp edges to produce round holes in the paper. Drills are available in various
diameters. This operation is performed by a machine called paper drill.
Slotting is a method of making holes on paper for binding that are not round.
Round corneringis a rounding operation performed on the corners of paper.
Slotting and rounding operations are also done by a paper drilling machine.
Scoring
Compressing a line across
a heavy sheet of paper to
improve the sheets ability
to fold on that line is called
scoring or creasing.
Scoring is performed by
pressing a steel rule aganist
a paper or by sending the sheets under scoring wheel.
Following points should be observed when scoring a paper- For thicker paper, thicker scoring should be given.
- Scoring wheels are not effective as steel rules.
- Scoring wheels should be used with extreme care on coated paper.
Slitting
Slitting is the process of cutting printed sheets or web into two or more sections
by means of a cutting wheel on a printing or folding machine. It is used to
seperate two or more products from a large sheet.
Die cutting
It is a finishing operation that uses a sharp steel rule or knife to cut a specific
pattern into a substrate or to cut a substrate into a specific pattern. Irregular
shapes or designs that cannot be cut with a stright cut is done by this process.