GBC GBC4250 - Film Tension and Adjustment

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*Slow-Medium indicates a SPEED CONTROL setting approximately midway
between “slow” and “medium”.
FILM TENSION ADJUSTMENT
Proper tension is the minimum amount required to eliminate wrinkles in the
finished laminated item. The film tension is set at the factory. Periodic
adjustment should not be necessary unless other than 1.5 mil GBC film is
used or the lamination is exhibiting unsatisfactory. Film tension may be
checked periodically to assure that adjustment is not required.
The film should be taut. An adjusted roll of film should not require excessive
force to turn by hand. Film tension should be enough to introduce a minor
amount of drag as the film unrolls. Under- or over-tightening will introduce
wrinkles or incomplete adhesion on laminated items.
Too little tension causes wrinkles in the finished laminated item. Too much
tension causes film to stretch. The top and bottom rolls should be adjusted to
exhibit equivalent tension.
Uneven tension between the top and bottom rolls can cause the laminated
product to curl. Upward curl indicates greater tension on the top roll.
Downward curl indicates greater tension on the bottom roll. Over-tightening
may cause slippage of motor clutch.
1. U nroll 2 ft. of film on the bottom roll of film.
2. Insert the alien (hex-head)
wrench provided with the
laminator into adjustment
hole as shown in figure 10.
3. Rotate film roll until
wrench engages internal
brake mechanism. While
holding the alien wrench in
place, rotate film roll in
direction of arrow of figure
10 to increase tension.
4. Remove alien wrench.
5. C heck brake tension setting by rotating the film in the direction of normal
rotation. Resistance to rotation should be slight, not forced.