(1) The cardboard has a high moisture content. Possible causes:
Insufficient heat of double-sided machine hot plate
One-sided machine too much glue
The glue solids content is too low
Face paper is too high
(2) Low corrugation height, possible causes:
Larger shape and positional errors between the pair of corrugating rolls (if not parallel, jerk, etc.)
Corrugated roller wear
Molding is a high standard but is flattened in the drying section
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