1. The square carton needs to be chamfered. Due to the particularity of the square carton, its two upper lids will overlap exactly, and the picking pins of the carton opener will pass right through the gap of the carton, making it impossible to open the carton. Therefore, users are required to chamfer the carton when making it to create conditions for smooth opening.
2. The creases of the carton should be deep. The requirement for deep creases is not only applicable to square cartons but also to all cartons used with carton openers, especially for thicker cartons. If the creases are not deep when used on the carton opener, the lids often cannot be folded.
3. The production of the carton should be standardized. Many people tend to overlook this issue, especially when folding cartons manually. How to check if the production of a carton is standardized? Avision will teach you a method. Fold the carton in the normal order. Without any external force, observe whether the upper lids are neat and whether the center line is centered, etc. If the two upper lids overlap and cannot be aligned when folded normally, it indicates that the carton is not produced in a standardized way. In this case, the carton opener cannot realign and seal the carton again. Therefore, the effect of using such a carton for sealing with a carton opener is very poor. 