- [Instructor] Web offset presses are used
for high quality long runs
and they may include inline finishing.
Web offset presses are used because of their high speed
and that's why they're used for long runs
such as publications or textbooks or newspapers.
Some web offset presses include inline folding
of signatures.
A signature is just the printed paper
that contains multiple pages that all belong together
for final binding.
Some web offset presses include inline gluing
and other applications.
For example, perfume samples.
If you've used one of those perfume samples out
of a magazine, that was created on a web offset press
and that perfume sample
is applied inline right on the press.
It makes the press room smell really good.
It can print both sides of the paper simultaneously
if it's what's called a perfecting press.
Now, stock is not quite as varied for web offset presses
as it is for sheet fed presses, but that's
because of requirements of the web offset printing process.
Web presses are so called because they're fed by a web
of paper unrolling from a huge role.
While a wide variety of stock is available for web presses,
the necessity of tensile strength and brain orientation
dictates the type of stock that can be fed
into a web press.
Here you can see the web of paper coming down
and being folded in half to start the process
of combining signatures
into the proper page order for finishing.
Paper is flying through the press at a very high rate
of speed which is why choosing appropriate stock
is very important.
Now this may look like a special effect
but when the video is slowed down like this
you can see the paper being guided
into the rollers and being folded.
As you can see, the web of paper follows a complex path
as it passes through the press
and that's to maintain correct tension
to pull the paper through the press
and ensure the paper doesn't tear and stop the job.
Think of the design and engineering that goes
into creating these huge, wonderful machines.