Carton Stacking Tester Cardboard Warpage Problem Solution

Paper is paper tester, stacking cardboard carton manufacturers of the necessary equipment, mainly used for the package, carton compression hold pressure, stacking strength test, the test results can be used as an important reference plant height of stacking the finished box Or design an important basis for the box. Today, the technician of the carton compression tester introduces you to the warpage problem and solutions.

Cardboard warpage refers to the fact that the paperboard is raised or recessed in a relatively large area. There is a kind of cardboard warping called "positive curvature", also known as "warped upwards," that is, the cardboard convex to the side of the paper. On the contrary, it is "inverse curvature". One side is convex and the other side is concave. It is “ S -shaped curl”. The curl that starts with the diagonal of the cardboard is the “warped twist”. The axis of warpage is parallel to the direction of the corrugation and is called "warp in the length direction." The use of curved cardboard as a carton, molding can not be square, affect the appearance, instability of compressive strength. Curved paperboards are not easy to accumulate and cannot enter the printing press smoothly, which seriously affects the printing effect and the precision of slotting and die cutting.    

    The fundamental reason for the curling is that the paper shrinks unevenly and is caused by the different extent of the various components of the cardboard. Different paper moisture content, the degree of contraction will be different. When the paper board and the inner paper have different telescoping degrees, the paperboard is likely to cause warp. Using thicker and heavier papers than thin papers and low heavier papers, the stretching is relatively stable and not easily deformed, so when the thickness and weight of the different facial papers and liners are different, the cardboard is likely to produce music. Alice, so in the carton design stage of the paper, should make the surface of the paper weight and thickness equal to or close to. The degree of stretching of paperboard and paperboard directly affects the stacking strength of the carton. The stacking strength can be detected by a carton compression tester.   

    In production, the shrinkage of the paper can be controlled by adjusting the heat to reduce the degree of curling of the paperboard. The reason for the "positive curvature" is generally because the paper and single corrugated paper are too wet and the paper is too dry. Therefore, the drying of the paper and the single corrugated paper should be strengthened, and the warm-up of the noodles should be reduced. Appropriate measures, such as increasing the preheating area of ​​corrugated paper and liner paper on single-sided machines, lowering the temperature of the hot plate, appropriately increasing the speed of the vehicle to reduce heat transfer, and reducing the amount of paste on the single-sided machine, can largely avoid Paper curls. The reason for the reverse is that the reason is that because the single-sided corrugated sheet is too dry and the sheet of paper is too wet, the opposite method can be used for control. “ S -curve” is usually due to the paper edge is too wet, causing the base paper to shrink seriously, can make up for the increase in the warm-up time of the base paper; the other cause of curling is due to the difference in weight between the upper and lower paper is too large, you can adjust the paper, Reduce the appearance of this phenomenon. "Twisted and warped" is caused by poor quality of the base paper, uneven moisture distribution in various places, uneven temperature distribution on the hot plate, etc., and corresponding rectification of these aspects. “Changing in the length direction” is caused by inappropriate tension and the web tension can be adjusted. At this point, automatic rupture testing machine can be used for testing.    

The above problem of curling can also be improved with a spray device. For the curled paperboard that has been produced, it should be immediately turned over. The high temperature and high humidity characteristics of the corrugated paperboard when it emerges are stacked in time. The boards are pressed against the board and then pushed to the ventilated place for heat dissipation for 4 to 8 hours. The paperboard is relatively flat.

Dongguan Haida equipment specializing in the production of carton compression testing machine , burst strength testing machine, drop test bench , vibration testing machine and other packaging testing equipment, welcome to call!

For more detailed product series and related technical parameters, please contact:

National Unified Service Hotline: 400-0711-808

Haida International Instrument: 0769-89280808

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