Oki OKIPOS 425S Developer's Manual page 86

5.7.5.3.9 Wrinkle, Pleat and Swell
Use paper, which has been folded zigzag on horizontal perforated lines, free of wrinkles and pleats.
Newly unpacked paper often has wrinkles or pleats on the first and last pages. Please eliminate pages having wrinkles and
pleats before printing.
Do not utilize paper whose folding position inflates as illustrated in the fig below, because it may cause malfunction in paper
feed.
OP425_28.eps and OP425_29.eps
1
1 Wrinkle
2 Pleat
3 Rounded ends
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2
3