We first start with the error of the width and height of the indentation groove of the carton to distinguish the quality of the carton. Generally, the inferior indentation line is mostly produced by small factories, and these small factories generally have no professional experiments. Room, lack of product R&D and quality control, the cardboard boxes produced are uneven and poor precision.
The width and height of the indentation groove have a very large error, which is very easy to cause product problems. Therefore, we can observe the error of the width and height of the indentation groove of the carton when buying, so as to distinguish the quality of the carton.
A good way is to weigh it. Weight is a hurdle that paper cannot be faked, and it is also fundamental.
Secondly, look at the surface glossiness of the carton paper. Since the cowhide is coarse paper, the production process does not require high glossiness on the surface, but it requires smoothness. This can be seen in the core paper, which is also the only core paper. The reason why it can be the middle wave and the partition is that it is rough, and the glue has strong adsorption.
Hardness and thickness are also an important parameter of paper quality. High hardness is not necessarily thick, and thick is not necessarily high. Hand feel, this is the experience, usually contact with cardboard, you can practice a pair of "carton box hands", this can only be touched, poke, pinch.