First, the height of the caries is low: Because the pressure roller of the upper corrugating roller applies pressure to the lower corrugating roller (general line pressure is 5 to 10 kg/cm), the pressure acts on the dome of the UV-shaped corrugated plate for a long time. Corrugated paper is constantly rubbing against the dome during the forming process of the corrugated fiber, which makes the dome of the corrugated tooth wear quickly. If the height of the dents is lower than the lower limit of the standard 因 height due to wear, the laps rolled out will not meet the standards.
Second, the flat head: due to the three-roller pressing in the pressurized state, especially the "pressure roller" squeeze "lower corrugating roller", resulting in the dome from the tip to the flat top, resulting in increased glue, "glue" time The lengthening can only reduce the speed of the vehicle to ensure adequate "gelatinization."
Third, one side down: "The upper corrugated roller" is driven by the "lower corrugated roller" tooth, so the circumferential force of the reed tooth always acts in one direction, the wear of the reed tooth is faster than the unforced side, so that The teeth appear to wear on one side and the corrugated shape of the corrugated board produced is also one-sided, affecting the strength and appearance.
Fourth, grinding pits: corrugated paper in the corrugated roll rake teeth forming process, paper and rake teeth have relative sliding, because the corrugated paper will always contain a certain amount of sand or other hard impurities, this slide makes the corrugated paper like the belt along the circumference Rubbing and rubbing teeth, over time, so that the corrugated roller rake tooth surface produces point-like abrasion, commonly known as grinding pit. The surface roughness of caries is severe. The lower the quality of corrugated paper, the greater the chance of grinding pits.
Fifth, the high wear: As the production line often do not use full-width paper (ie, paper width is less than the corrugated roll width), so that the middle of the corrugated roller wear faster than the two ends, resulting in the so-called high wear, the occurrence of high wear corrugated roller, in When corrugated corrugated corrugated board is pressed, the stress at both ends is greater than the middle force, which will cause the corrugating medium to break at both ends after the forming of the corrugated medium.
6. Tilting or twisting of dental caries: If the parallel adjustment of the upper and lower corrugating rollers is not proper, the corrugated roller is subjected to a greater force at one end, and the long-term operation may cause the dental caries to tilt or twist. In addition, it can also cause ovality of the corrugating roll, and the occurrence of overshoot in the garden.
When the above six types of wear reach a certain level, the corrugating roller must be repaired. This type of repair can generally only be performed twice. Because the first grinding roller, its diameter should be reduced by about one millimeter, the second time to repair its circumference will be reduced by more than 6 mm, so that the pitch and wedge angle of the caries will change, due to the same transmission ratio , "The lower corrugated roller" and the pressure roller are not synchronized, causing the paperboard to wrinkle. Therefore, the pressure roller should also be repaired while repairing the corrugating roller.
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