For the carton that has been covered and varnished, there are 4 ways to solve the problem of the glued box:
First, place a needle and thread knife at the sticky mouth during die-cutting to puncture the surface of the sticky mouth to facilitate the penetration of the adhesive.
Second, use the edging device attached to the automatic folder gluer to grind the surface of the sticky mouth to facilitate the penetration of the adhesive.
Third, the hot melt adhesive is sprayed to the sticking mouth part, and the material on the sticking mouth surface is melted at high temperature to improve the fastness of the glue box.
Fourth, when designing the box shape before printing, you can leave a gluing part on the edge of the box to be covered and varnished in advance.
For the phenomenon that the folder is not strong due to insufficient pressure, you can increase the pressure of the pressing part of the folder gluer, prolong the pressing time, or replace the adhesive with strong adhesion.
Solve the deformation of the carton when the paper bag is glued:
There are three main reasons for the deformation of paper bag glue:
(1) Some die-cutting plates are made by hand, and the size of the carton is often inconsistent due to low precision, and the carton is deformed when the box is pasted.
(2) The concentration of the adhesive is low and the water content is large, which causes the cardboard to absorb moisture and deform, and the carton is not flat after forming.
(3) The folder gluer itself is not adjusted well.
This problem can be solved as long as the die-cutting quality is stable, the adhesive with the appropriate concentration is selected, and the folder-gluer is adjusted well.
3. The sticky mouth of the carton is skewed
There are three main reasons for the skewed sticky mouth of the carton:
(1) The indentation groove of the indentation line is too wide and the indentation pressure is not enough, so that the extruded indentation line is not full, and the indentation line cannot be folded accurately when folded and glued.
(2) Improper adjustment of the folding transmission, the conveying speed of the left and right sides of the box sheet is inconsistent, resulting in skewed sticky mouth.
(3) Improper installation of the folding rod.
Solution: reduce the width of the indentation groove of the indentation line and increase the indentation pressure; adjust the folding transmission to make the conveying speed of the left and right sides of the carton the same; reinstall the folding rod.
4, the sticky mouth alignment is not allowed
Inaccurate sticky mouth alignment means that the sticky mouth is misplaced, and the misplaced carton cannot be formed well. This phenomenon is usually caused by the inaccurate adjustment of the machine. Further, it is mainly due to the insufficient knowledge of the operator on the box type and the folder gluer, which affects its operation level.
Therefore, strengthening the training of operators, improving their operating skills and their understanding of complex box shapes can effectively avoid the problem of inaccurate sticky mouth alignment.
5, sticky mouth overflow glue
Glue overflow refers to the excessive amount of adhesive flowing out of the sticky mouth. This phenomenon is mainly caused by the dislocation of the sticking mouth and the excessive amount of adhesive. By grinding the sticky mouth and reducing the amount of glue, the occurrence of glue overflow can be effectively reduced.
