Formax FD 332 Operator's Manual page 20

Drawing paper
13# or lighter
cannot be folded.
The surface of four fold rollers
are stained with paper chips or
ink (slippery situation)
Low room temperature
Clean away the stain on four fold rollers
using the approved cleaner.
The paper gets stiff and hard to fold at the
low room temperature in winter. Perform
folding after leaving the paper as it is for 3
to 4 hours at the temperature of 53 to 67°F.
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