[Wa Line Technology] Teaches You Three Proven Techniques to Eliminate S-Shaped Warping and Diagonal Curl in Cardboard
Release Date:
2020-03-03
S-shaped warping and diagonal warping of cardboard are among the most challenging issues faced by many corrugated packaging companies. So how can these problems be effectively addressed? The key is to identify the root cause, so that the appropriate corrective measures can be implemented.
S-shaped warping and diagonal warping of cardboard are among the most challenging issues faced by many corrugated packaging companies. So how can these problems be effectively addressed? The key is to identify the root cause—only then can the appropriate corrective measures be implemented.
First, what are S-shaped curls and diagonal curls? S-shaped curl refers to transverse upward and downward warping along the width of the paper web, while diagonal curl refers to diagonal warping across the width of the paper web.
Secondly, how do S-shaped bends and diagonal curls form? S-shaped curl and diagonal curl are primarily caused by uneven moisture or temperature on the paper drive side and the operator side, as well as inconsistent tension and tightness across the entire width of the base paper. When there is a moisture imbalance between the left and right sides of the paper—while the drying conditions on both sides remain essentially uniform—the resulting cardboard, after passing through the preheater and heated platen, will curl toward the side with lower moisture content and bend away from the side with higher moisture content, thus forming an S-shaped curl.
First, When purchasing base paper, it is important to ensure that its moisture content meets the appropriate standard, which is typically 8%–10%.
Second, When configuring the equipment, the following three points must be carefully observed: 1) Temperature—ensure that the temperature on the drive side and the operator side of the entire production line is consistent across both sides; 2) Adhesive—on the single-sided coating machine and the gluing machine, ensure that the gap between the left and right coating rollers is uniform and that the adhesive application rate is consistent; 3) The horizontal alignment among the base paper rack, preheater, gluing machine, and hot plate is also critical.
Third, If, despite ensuring that the equipment itself is free of the aforementioned issues, the cardboard still exhibits S-shaped warping or diagonal curling, then measures such as installing tension-balancing rollers and spray systems—equipment that can balance lateral tension and moisture content across the sheet—should be implemented to address these defects.
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