GBC VOYAGER, Инструкция по эксплуатации, Страница: 42 / 54

© GBC Films Group April 2000
Voyager Operation and Maintenance Manual
Page 1 - 40
Application
5.7 Over view
An over view is provided to explain how certain
adjustments are determined and to give you, the operator,
a more insightful view of an adjustment.
Nip pressure
Many factors affect the choice of the nip pressure.
Factors you should consider may include: kinds of material
in film and paper stock, thickness of adhesive, paper grain
length and grain direction, as well as thickness and size of
sheet. Laminating thick sheets may call for high pressure
to minimize “tenting” at the end of the sheet. Paper will
not tolerate as much nip pressure after it has been exposed
to high humidity.
If you are using material like foam board or
corrugated board, that must be protected from crushing,
you can apply just enough air pressure to overcome the
resistance of the springs and bring the chrome roller into
contact with the sheets.
Film tension
Several factors may affect the choice of film tension. These
factors include the speed of operation, size of the film roll,
and use of the slitter.
There are various ways of adjusting the film tension.
1. First adjust the bow to smooth the film out across the
bow roller as much as possible, prior to applying the brake
tension.
2. Apply film tension by turning the air pressure adjusting
knob on the control panel. Wrinkles in the film will give a
“waterfall” -like appearance to the film near the point
where it meets the chrome roller.
3. By slowly turning the adjusting knob, adjust tension so
the “waterfall” extends no more than halfway around the
chrome roller.
Breaker bar
Because the action of the brake at the Film Supply
Shaft stretches the film before it is applied, the tension in
the film tends to bow the laminated product upward. To
counteract the bowing tendency, the laminator “breaks”
the paper. That is, while the laminated sheets are still hot,
they are pulled over the edge of a breaker bar to stretch
the film more and impart a downward curl to the product.
Thick sheets may not require breaking.
Pull rollers
The Pull Rollers, located after the knicking section of the
laminator, run slightly faster than the laminating rollers, to
keep the web tight as it goes over the breaker bar. During
any laminating operation, the pull rollers are applied by
rotating the lever attached to the lower pull roller.