There are four ways to distinguish carton indentation lines.

There are two ways to distinguish the indentation lines of cartons: one is to distinguish the width and height errors of indentation grooves.

Inferior indentation lines are mostly produced by small factories. These small factories generally do not have professional laboratories for product research and development and quality control, so the products produced are uneven, with poor precision and large errors. For example, the indentation line with the model of 0.5X 1.5mm, according to the rigorous test in the laboratory, the indentation groove width range of the inferior indentation line is actually 1.6 mm- 1.8 mm, and the measured value is completely out of the range of its nominal value of 7.5mm. For the high-quality indentation line of the same model, the indentation groove width ranges from1. Another example is the height of the indentation groove. The measured value of the lower indentation groove height is 0.52 mm ~ 0.55 mm, and the maximum error reaches 10%. For high-quality products of the same model, the measured value of indentation groove height is 0.50 mm-0. 5 1mm, and the error is completely controlled within 2%. It can be seen that the indentation groove error of inferior indentation line is very large, which is easy to produce a series of quality problems.