The paste shape of the double-sided paper web is in the longitudinal direction of the corrugation, and there are unbonded traces imagined by the shape of the guide claw.
the reason
1. The tension on the core paper is too great, so that the core paper is caught in the groove of the upper corrugated roller, so that a groove is left on the core paper on the side of the double-sided paper, when the core paper passes through the paper on the double-sided machine When rolling, these recesses cannot stick to the glue.
2. Dirt on the corrugated roller
3. The core paper is too wet
4. The groove on the corrugated roller becomes wider due to the wear of the guide claw
5. Too much vacuum or pressure makes the core paper crepe, the core paper on the side of the double-sided machine cannot stick to the paste on both sides of the fold
Measures
1. Reduce the amount of steam spray and relax the braking device on the core paper
2. Remove the dirt on the corrugated roller
3. Cut off the steam flow to the core paper and increase the wrap angle on the preprocessor
4. Replace the corrugated roller
5. Reduce vacuum or pressure
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