When the corrugation height is not constant, the irregular paste shape on the double-sided surface paper can also show the uneven corrugated.
The most common cause of lumpy corrugations is the inaccurate position of the leader and the core paper between the rollers, and these causes are eliminated in single-sided machines without guide ribs.
However, the unevenness of the corrugated output produced by the non-guided single-faced machine is also sometimes seen, but this problem is less serious.
The following defects and causes analysis can be referenced by the operator of the wireline:
the reason
During critical speed operation, the corrugating roll vibrates on the corrugating roll with a dirt core paper. The web tension is too high. The pressure on the corrugating roll is too small. The corrugating roll surface is rough or damaged. The core paper is rough Core paper is too wet or too high. Core paper and face paper The process of compounding is not going well
Measures to make the tile run slower or faster than the critical speed Remove dirt from the corrugating roller Reduce tension Increase roll to suitable pressure Smooth rough surface, or replace corrugating roller Increase steam ejection Use wax stick to modulate core roll Use pre The regulator covers the arm or adjusts the amount of steam injected,
Maintain the proper humidity of the core paper Check the vacuum valve setting and the vacuum level at both ends of the lower corrugating roller. Check the gap between the vacuum cover plate and the position of the paper guide roller at the exit of the paper.