Brief introduction to the technical requirements of corrugated rolls for cardboard production line

Once, when I was teaching a carton compression design and influencing factors course in an enterprise, I raised a technical issue affecting the corrugated forming for the decision-making level, management personnel, engineering technology and front-line operators of the enterprise, namely Corrugated roller's middle-high problem. As a result, all managers are not clear, and only one operator knows a little or two, but he can't tell what is going on. This shows that some companies do not pay enough attention to the technical training of employees. It is conceivable that when such companies encounter pressure complaints or other technical problems, it is difficult to analyze, solve and improve.

Below I will briefly introduce the main technical requirements of corrugated rollers.

We know that during the process of corrugating roll forming, corrugating rolls include a process of ironing, sizing, gelatinization and compound drying. During the ironing and bending process of the corrugated base paper at high speed and continuous section, the upper and lower corrugating rollers must have a certain matching pressure, that is, a certain linear pressure effect, and the pressure is applied at both ends of the corrugating roller. The result is Corrugated rolls must inevitably have a certain degree of deflection (during bending deformation, the cross-sectional centroid moves along a line perpendicular to the axis), which increases the gap in the middle of the corrugated rolls. Quality issues.

In order to make up for the problem of increased clearance due to bending deflection, the corrugated roller is manufactured so that the central diameter is slightly larger than the two ends. This difference is called medium and high. It can be seen that it is necessary for the design of corrugated rollers to have a certain middle and high height, and our engineering and technical personnel must have a certain understanding of it. Of course, the size of the middle height is calculated by the deflection curve according to the material used, the wall thickness and hardness of the roller.

In the actual production process, when the corrugated roller corrugated roof moves relatively, friction extrusion is required. The corrugated roof is gradually grinded from an arc into an irregular shape or pits and depressions appear, and the height of the corrugated tooth is gradually reduced, resulting in The thickness of the cardboard gradually became thinner.

In addition, we also know that a corrugated cardboard production line with a certain width cannot run at full width during normal use. Small paper webs often appear, which results in inconsistent wear of various parts. Therefore, When using narrow-width corrugated base paper, it should be offset regularly to make the corrugated roller wear evenly.

Now that we know the wear mechanism of the corrugated roller, we should try our best to slow down the wear and damage to the corrugated roller. For example, when selecting corrugated base paper, be sure to control the sand content of the paper; narrow width paper should try to use both ends of the corrugated roller, and often exchange; often check whether the axis between the rollers is parallel, that is, the corrugated roller must be adjusted The parallelism between the two; whether the corrugated roller has been relieved of pressure when idling; the size of the matching pressure must meet the technological requirements of corrugated forming.

In addition, we must pay attention to the daily inspection and maintenance of corrugated rollers, such as cleaning the corrugated teeth and lubricating and refueling after use.