The shape of the paste of the double-sided paper web is in the longitudinal direction of the corrugated medium, and there is an unbonded trace that is conceivable with the shape of the guide claw.

the reason

The tension on the core paper is too high, so that the core paper sinks into the groove of the upper corrugating roller, leaving a groove in the core paper on the side of the double-sided paper, when the core paper passes through the transfer roller on the double-sided machine These recesses cannot be glued to paste

Corrugated roller with dirt

Core paper is too wet

Due to wear of the guided jaw, the groove on the corrugating roller is widened

Too much vacuum or pressure causes the core paper to crease. The core paper on the side of the double-sided machine does not adhere to the glue on both sides of the crease.

Measure

Reducing the amount of steam injected and releasing the braking device on the core paper

Remove dirt from corrugating rollers

Cut off steam flow to the core paper and increase the wrap angle on the pretreater

Replacing corrugating rollers

Reduce vacuum or pressure