1) Quality of raw materials
The base paper is the decisive factor in determining the compressive strength of the carton, which can be seen from the kellicutt formula. However, the influence of other conditions in the production process of corrugated cardboard cannot be ignored, such as the amount of adhesive, the change of flute height, dipping, coating, composite processing and so on.
2) Moisture
Cartons made of corrugated cardboard with excessive moisture content or stored in a humid environment for a long time will reduce their compressive strength. Fiber is a kind of strong water absorption. In the rainy season and when the humidity in the air is high, the relationship between the moisture in the cardboard and the humidity balance of the atmospheric environment is very important.
3) Box type
Box type refers to the type of box and the size ratio of the same type of box, which have a significant impact on the compressive strength. Some carton boxes are made of double-layer corrugated cardboard, and the compressive strength is significantly higher than that of single-layer boxes of the same specification; under the same conditions, the higher the box, the worse the stability and the lower the compressive strength.
4) Printing and drilling
Printing reduces the compressive strength of the carton. For products with ventilation requirements, opening holes on the box surface or punching handle holes on the side of the box will reduce the strength of the carton, especially if the opening area is large, and the impact is more obvious.
5) Processing technology deviation
In the process of box making, improper line pressing, too deep slotting, weak bonding, etc. will also reduce the compressive strength of the finished box.
