1. The size of the carton box designed by the carton factory is unreasonable, and the length, width and height of the carton have a great relationship with the damage of the carton. The size of the carton is generally determined according to the number of bottles to be filled and the height of the bottles. The box length is the number of bottles in the length direction × the diameter of the bottle, the box width is the number of bottles in the width direction × the diameter of the bottle, and the box height is basically the bottle height. The perimeter of the four sides of the box is equivalent to the entire side wall supporting the pressure load of the carton. Generally, the longer the perimeter, the higher the compressive strength, but this increase is not proportional. If the perimeter of the four sides is too large, that is, the number of bottles in the contents is relatively large, the gross weight of the product in the whole box is large, and the requirements for the carton are also high. It needs to have high compressive strength and bursting resistance to ensure the performance of the carton. Otherwise, , The carton is more likely to be damaged during the circulation process. On the market, 596mL x 24 bottles of pure water tank is the most damaged among all cartons, because its gross weight is large, and it is a single-watt carton, which is prone to damage during the circulation process. When the length and width of the carton are the same, the height has a greater impact on the compressive strength of the empty box. When the perimeter of the four sides of the carton remains unchanged, with the increase of the height of the carton, the compressive strength decreases by about 20%.
2. The thickness of corrugated cardboard does not meet the requirements. Because the corrugated roller will be worn during use, the thickness of the corrugated cardboard cannot meet the specified requirements, so that the compressive strength of the carton is low, and the strength of the carton will also decrease.
3. The bonding strength of the carton is poor. To judge whether the carton is well bonded, just tear off the bonding surface by hand. If the original paper surface is found to be peeled off, it means that the paper is well bonded; if it is found that the ridges are bonded If there is no torn paper fiber or white powder, it means false stickiness, which will cause the compressive strength of the carton to be low and affect the strength of the entire carton. The bond strength of the carton is related to the grade of the paper, the formulation of the adhesive, and the manufacturing equipment and process operations.
4. The unreasonable design of the cardboard layers of the carton and the unreasonable design of the cardboard layers will lead to an increase in the damage rate of the outer packaging carton. Therefore, the number of cardboard layers used in the carton should be considered according to the weight, nature, stacking height, storage and transportation conditions, storage time and other factors of the packaged goods.
5. The printing design of the carton is unreasonable, and the corrugated shape and structure of the corrugated cardboard determine the bearing pressure of the corrugated cardboard. Printing will cause certain damage to corrugated cardboard, and the size of the pressure and the size of the bearing area is a major factor affecting the compressive strength of the carton. If the printing pressure is too large, the corrugation will be easily crushed and the corrugated height will be reduced. Especially when printing at the pressure line, in order to force and clear the printing at the pressure line, the entire cardboard will be crushed, which will greatly reduce the compressive strength of the carton, so try to avoid printing here. When the carton is full or printed around, in addition to the pressing effect of the embossing roller on the corrugated cardboard, the ink also has a wetting effect on the paper surface, which reduces the compressive strength of the carton. When the general carton is fully printed, its compressive strength will drop by about 40%.
6. The corrugated deformation of the carton, the corrugated cardboard itself is soft, the plane strength is low, and the rigidity is also low. Because the shape of the corrugated is directly related to the compressive strength of the corrugated cardboard. The shape of corrugated is generally divided into U-shaped, V-shaped and UV-shaped. The U shape has good extensibility, elasticity and high energy absorption. Within the elastic limit, it can still return to its original state when the pressure is removed, but because the focus point of the arc is unstable, the flat compression strength is not high. The V-type has little contact with the paper surface, poor adhesion and easy peeling. With the help of the combined force of the two diagonal lines, the force is good, and the flat pressure strength is large. However, if the external force exceeds the pressure limit it bears, the corrugated shape will be destroyed, and the original shape cannot be restored after the pressure is removed. UV type takes the advantages of the above two types of flutes, has higher compressive strength, better elasticity and elastic recovery ability, and is an ideal flute type.
