After the paper box produced by the box gluer is glued and formed, the bonded part cracks. The reason is as follows.

1.  The viscosity of glue is not enough and the amount of glue is not enough.

Solution: Glue boxes generally use white latex, which is diluted with water during use, which also reduces the viscosity. When the viscosity is not enough, the glue with higher concentration can be reconstituted. If the amount of glue is insufficient, the gap between the rubber wheel and the glued surface of the cardboard can be increased, and the amount of glue can be increased.

  2.  Workshop temperature affects the viscosity of glue (especially in summer and winter).

Solution: Control the temperature of the paste box workshop at about 20°C through temperature adjustment devices such as air conditioners to ensure the normal viscosity of the glue.

 3.  Before using white emulsion, it is not carefully checked, which leads to the use of expired or deteriorated glue.

Solution: Before using the white latex, it should be properly stored and sealed. Its shelf life is generally one year.

 4.  The white latex used does not match the cardboard.

Solution: because there are many types and grades of white latex in the market, we should choose white latex according to the specific characteristics of products.

5. There is glazing or film covering on the gluing part of the carton, which prevents the glue from penetrating into the cardboard.

Solution: the paper board edge grinding device can be installed before the gluing of the paper box to grind the edge of the gluing part of the paper box before gluing, so as to eliminate the influence of glazing or laminating. Conditional also can use hot-melt adhesive instead of white latex, the use of hot-melt adhesive temperature melting on the film, convenient adhesive bonding.

6. After the paper box is glued, the pressure on the glued part at the folding part is not enough, the machine speed is too fast, and the pressure time is not enough, so that the glue can not penetrate into the cardboard in time, reducing the bonding effect.

Solution: Increase the pressure of the creasing roller, appropriately reduce the machine speed, and extend the pressing time.