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What are the factors that determine the damage of packing cartons?

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during the use of packaging cartons, there will always be problems, such as damage, such as bulging, which has brought great trouble to loading. Now, Chongqing Blister Factory will analyze the causes and solutions of these problems according to its own processing reasons.
1、 Causes of problems
(1) Fat or bulging
1. Improper selection
The height of tile a is the highest. Although the same paper has good performance of bearing vertical pressure, it is not as good as type B and type C in bearing plane pressure. After the cartons of tile a are loaded with products, during transportation, the cartons will be subject to horizontal and vertical vibration. The repeated impact between the packaging and the cartons will make the carton wall thinner, resulting in fat or bulging.
2. Impact of stacking finished shovel plates
When products are stacked in the finished product warehouse, they are usually stacked very high, usually two shovel plates high. During the stacking process of cartons, the strength change of cartons, especially the bottom box, is a “creep” process, which is characterized by the relatively stable load acting on the cartons for a considerable time. The cartons will produce continuous bending deformation under static load. If the static pressure is maintained for a long time, the cartons will collapse and damage. Therefore, the cartons at the bottom stacked on the shovel board often swell and some of them are crushed. When the carton is subjected to vertical pressure, the deformation of the center of the carton surface is the largest, and the crease after crushing is like a parabola, which is bulging. The test shows that when the corrugated box is pressed, the strength at the four edges and corners is the best and the strength at the midpoint of the transverse edge is the worst. Therefore, the foot of the upper shovel plate is directly pressed in the middle of the carton, forming a concentrated load in the middle of the carton, which will cause the carton to crack or permanent deformation. In addition, due to the too wide gap of the shovel plate, the corner of the carton falls in, which will cause the carton to be fat or bulging.
3. The exact size of the box height is not determined
The carton height of carbonated beverage boxes and water tanks is generally determined as the bottle height of the inner bottles plus about 2mm. As the cartons are stacked, they bear static load for a long time, and are impacted, vibrated and bumped during transportation, the carton wall thickness becomes thinner and part of the height is increased, so that the carton height is much larger than the bottle height, so the fat or bulging of the carton is more obvious.
(2) A large number of cartons were damaged mainly due to the following factors:
1. The box size design of carton is unreasonable
The length, width and height of the carton are closely related to the damage of the carton. The size of the carton is generally determined according to the number and height of bottles to be packed. The box length is the number of bottles with the rectangle upward × The diameter of the bottle and the width of the box are the number of bottles in the width direction × The diameter of the bottle and the height of the box are basically the height of the bottle. The perimeter of the four sides of the box is equivalent to the whole side wall supporting the pressure load of the carton. Generally, the longer the perimeter is, the higher the compressive strength is, but this increase is not proportional. If the circumference of the four sides is too large, that is, the number of bottles of the contents is relatively large, the gross weight of the whole box of products is large, and the requirements for the carton are also high. It is necessary to have high compressive strength and burst resistance to ensure the service performance of the carton. Otherwise, the carton is more likely to be damaged in the circulation process. 596ml on the market × The 24 bottle pure water tank is the most damaged in all cartons, because it has a large gross weight and is a single tile carton, which is easy to be damaged in the process of circulation.
When the length and width of the carton are the same, the height has a great influence on the compressive strength of the empty carton. When the perimeter of the four sides of the carton remains unchanged, the compressive strength decreases by about 20% with the increase of the height of the carton.
2. The thickness of corrugated board cannot meet the requirements
Because the corrugated roller will be worn in the process of use, the thickness of the corrugated board can not meet the specified requirements, so that the compressive strength of the carton is low, and the strength of the carton will also decrease.
3. Corrugated deformation of carton
The corrugated deformed paperboard itself is soft, with low plane strength and low rigidity. The corrugated carton made of such paperboard has low compressive strength and puncture strength. Because the shape of corrugated board is directly related to the compressive strength of corrugated board. The shape of corrugated is generally divided into U-type, V-type and UV type. U-shape has good expansibility, elasticity and high energy absorption. Within the elastic limit, it can still be restored to the original state after the pressure is eliminated, but the flat compression strength is not high because the force point of the arc is unstable. V-shape has small contact with the paper surface, poor adhesion and easy peeling. With the help of the resultant force of two oblique lines, the stiffness is good and the flat compression strength is large. However, if the external force exceeds the pressure limit, the ridge shape will be damaged and cannot be restored to its original state after the pressure is eliminated. UV type takes the advantages of the above two corrugated types. It has high compressive strength, good elasticity and elastic recovery ability. It is an ideal corrugated type.
4. The design of cardboard layers of carton is unreasonable
Unreasonable design of cardboard layers will increase the damage rate of 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 adhesive strength of carton is poor
To judge whether the carton is well bonded, just tear the bonding surface by hand. If the original paper surface is stripped, it indicates that the paper is well bonded; If it is found that there is no torn paper fiber or white powder at the ridge peak bonding, it indicates that it is false adhesion, which will cause the low compressive strength of the carton and affect the strength of the whole carton. The adhesive strength of carton is related to the grade of paper, the preparation of adhesive, manufacturing equipment and process operation.
6. The printing design of carton is unreasonable
The corrugated shape and structure of corrugated board determine the bearing pressure of corrugated board. Printing will cause certain damage to corrugated board. The size of pressure and bearing area is a main factor affecting the compressive strength of carton. If the printing pressure is too high, it is easy to crush the corrugated and reduce the corrugated height. Especially when printing at the line pressing position, in order to carry out forced and clear printing at the line pressing position, the whole paperboard will be crushed and the compressive strength of the carton will be greatly reduced. Therefore, printing here should be avoided as far as possible. When printing pictures and texts on or around the full board of the carton, in addition to the compression effect of the embossing roller on the corrugated board, the ink also has the infiltration effect on the paper surface, which reduces the compressive strength of the carton. Generally, when the carton is fully pri
nted, its compressive strength decreases by about 40%.

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