The reasons why the color box bursts are well known. It is nothing more than low moisture content and paper folding resistance, dry weather and other reasons. Here are a few practical solutions.

How to keep the water content of color box printing cardboard

1. Under normal circumstances, the moisture content of the cardboard after mounting the colored paper can reach more than 10%. However, when the weather is high temperature and dry and the moisture content of the cardboard to be mounted is very low, the moisture of the glue evaporates quickly, and the moisture content of the mounted cardboard is still very low. At this time, it is advisable to use the wet water roller of the self-mounting machine to wet the back of the cardboard. At the same time, use glue with low solid content and increase the amount of glue, so that the moisture content of the mounted cardboard can be quickly increased.

2. For the mounted colored paper, if the water content is too low, a single-color offset printing machine or a flexo printing machine can be used to print water on the back of the cardboard. After printing the water, wrap the cardboard tightly with plastic wrap and wait until the next day. Die cutting after moisture balance. Note that it is best to stick the box immediately after die-cutting. If the box needs to be placed for a period of time and then stick to the box, it should be wrapped with "stretch film" to avoid premature loss of water and recurrence of old diseases.

Choose coated white card with different folding endurance according to different mounting cardboard and moisture content

For most single-pit cardboard color boxes, due to the low tensile strength of the flap when folded, the problem of bursting is less. but

(1) Reasonable design of die-cutting plate

High-quality indentation steel wire should have moderate hardness, strong stability, smooth cutter head, symmetrical arc axis, small deviation in height and thickness, and complete specifications.

(2) When the distance between the indentation steel wires is too small, it is necessary to paste the sponge rubber strip to play the role of anti-pulling force, press the paper tightly and reduce the pressure. In addition, when calibrating the board, a groove shape can be formed at the line pressure position, so that the color box has a larger arc when it is folded and formed, so as to reduce the burst line.

(3) If the customer has no special requirements and there is no white cardboard with better folding resistance, it is recommended to use the lamination process for the colored paper, which can be done once and for all.