7. Along the length of the tower are guides to keep the tubular poly film
from shifting. As the film reaches the top of the cooling tower, the
guides gradually flatten it into a layflat form.
If the plastic bag will have gussets, special frames (called “gusset
boards”) indent the sides of the tube before it is flattened.
8. At the top of the cooling tower, motorized nip rollers grab the
solidified poly film. The nip rollers now take over the job of moving
the poly film up the cooling tower.