Causes and countermeasures of carton bulging and damage

Causes and countermeasures of carton bulging and damage

1、 Cause of the problem
（1） Fat bag or bulgy bag
1. Improper selection of ridge type
The height of A tile is the highest. Although the same paper has good vertical pressure resistance, it is not as good as B and C tile in plane pressure. After the A-tile carton is loaded with products, during the transportation process, the carton will be subjected to transverse and longitudinal vibration, and the repeated impact between the packaging and the carton will make the carton wall thinner, causing the phenomenon. Chocolate box
2. Impact of stacking finished shovels
When products are stacked in the finished product warehouse, they are usually stacked very high, usually two shovels high. During the stacking process of cartons, the strength change of cartons, especially the bottom carton, is a “creep” process. Its characteristic is that the relatively stable load acts on the cartons for a considerable time. The cartons will produce continuous bending deformation under the static load. If the static pressure is maintained for a long time, the cartons will collapse and be damaged. Therefore, the bottommost cartons stacked on the shovel often swell, and some of them will be 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 appears like a parabola to bulge out. The test shows that when the corrugated box is pressed, the strength at the four 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, which forms a concentrated load in the middle of the carton, which will cause the carton to break or permanent deformation. And because the gap of the shovel board is too wide, the corner of the carton falls in, which will cause the carton to be fat or bulgy. Food box
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 bottles containing the contents plus about 2 mm. Because the cartons bear static load for a long time and are impacted, vibrated and bumped during transportation, the wall thickness of the cartons becomes thinner, and a part of the height is increased, which makes the carton height much higher than the bottle height, thus making the fat or bulging of the cartons more obvious. Candy box
（2） A large number of cartons are damaged due to the following factors:
1. The box size design of the 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 of bottles to be filled and the height of the bottles. The length of the box is the number of bottles in the rectangular direction × Bottle diameter, box width is the number of bottles in the wide direction × The diameter of the bottle and the box height are basically the bottle height. The perimeter 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 container is too large, the gross weight of the whole box is large, and the requirements for the carton are also high. High compressive strength and bursting strength are required to ensure the use performance of the carton. Otherwise, the carton is easy to be damaged during circulation. 596mL on the market × Of all the cartons, 24 bottles of pure water tanks are the most damaged because of their large gross weight and single-tile cartons, which are easy to be damaged during circulation. Dates box
When the length and width of the carton are the same, the height has a greater impact on the compressive strength of the empty carton. With the same perimeter of the four sides of the carton, the compressive strength decreases by about 20% with the increase of the carton height.
2. The thickness of corrugated board cannot meet the requirements
Because the corrugated roller will be worn during use, the thickness of the corrugated board cannot meet the specified requirements, and the compressive strength of the carton is low, and the strength of the carton will also be reduced. Mailer shipping box
3. Corrugated deformation of carton
The cardboard that produces corrugated deformation is relatively soft, with low plane strength and rigidity. The compressive strength and puncture strength of the corrugated box made of such cardboard are also small. Because the shape of corrugated board is directly related to the compressive strength of corrugated board. Corrugated shapes are generally divided into U type, V type and UV type. U-shape has good extensibility, elasticity and high energy absorption. Within the elastic limit, it can still return to its original state after the pressure is removed, but the flat compression strength is not high because the point of force of the arc is unstable. The V-shape has small contact with the paper surface, poor adhesion and is easy to peel. With the help of the combined force of the two oblique lines, the stiffness is good and the flat compression strength is large. However, if the external force exceeds the pressure limit, the corrugation will be damaged, and the pressure will not be restored after it is removed. UV type takes the advantages of the above two types of corrugated, with high compressive strength, good elasticity and elastic recovery ability, and is an ideal corrugated type. Cigarette box
4. Unreasonable design of cardboard layers of carton
Unreasonable design of cardboard layers will lead to an increase in the damage rate of the outer packaging carton. Therefore, the number of layers of cardboard 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 packed goods.
5. The adhesion strength of the carton is poor
To judge whether the carton is well bonded, just tear the bonding surface by hand. If the original paper surface is found to be damaged, it means that the paper sheet is well bonded; If it is found that there is no torn paper fiber or white powder at the edge of the corrugated peak, 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 the carton is related to the grade of the paper, the preparation of the adhesive, the manufacturing equipment and the process operation.
6. The printing design of the carton is unreasonable cigar box
The corrugated shape and structure of corrugated cardboard determines the pressure bearing capacity of corrugated cardboard. Printing will cause certain damage to corrugated cardboard, and the size of pressure and bearing area is a major factor affecting the compressive strength of the carton. If the printing pressure is too large, it is easy to crush the corrugation and reduce the corrugation height. Especially when printing at the press line, in order to carry out forced and clear printing at the press line, the whole cardboard will be crushed and the compressive strength of the carton will be greatly reduced, so printing here should be avoided as much as possible. When the carton is full or printed around, in addition to the compression effect of the embossing roller on the corrugated board, the ink also has the wetting effect on the paper surface, which reduces the compressive strength of the carton. Generally, when the carton is fully printed, its compressive strength decreases by about 40%. hemp box
7. The paper used in the carton is unreasonable and does not meet the requirements
In the past, goods were mainly transported by manpower in the process of circulation, and the storage conditions were poor, and the bulk form was the main form. Therefore, the bursting strength and puncture strength were used as the main criteria to measure the strength of cartons. With the mechanization and containerization of the means of transportation and circulation, the compressive strength and stacking strength of cartons have become the main indicators to measure the performance of cartons. When designing cartons, the compressive strength that cartons can bear is taken as the condition and the stacking strength is tested.
If the minimum compressive strength is not considered in the design and determination process of the carton paper, the carton paper cannot reach the required compressive strength, which will lead to a large number of damage to the carton. There are clear regulations on the quantity of paper used for each type of carton, and the supply can only be high matched and not low matched when changing paper. tobacco
8. Impact of transportation
Many of the reasons for the damage of goods in the circulation process are caused by improper transportation or loading. Although the packaging protection measures of some products have reached high requirements, they will still be damaged. In addition to the unreasonable packaging design, the reason is mainly related to the choice of transportation means and modes. The impact of transportation on the compressive strength of cartons is mainly impact, vibration and bump. Due to the many links of transportation, the impact on the cartons is large, and the backward transportation mode, the rough handling, trampling and falling of the handling personnel are easy to cause damage. Hat box
9. Poor management of vendor’s warehouse
Due to the short performance and aging of the carton, the compressive strength of the corrugated carton will decrease with the extension of storage time in circulation.
In addition, the humidity in the warehouse environment has a great impact on the strength of cartons. Cartons can drain and absorb water in the environment. The relative humidity in the warehouse environment is very high, and the strength of the corrugated box will plummet.
Dealers often pile up goods very high because of the small warehouse location, and some even pile up goods to the roof, which has a great impact on the strength of cartons. If the compressive strength of the carton measured by the standard method is 100%, the carton will collapse in one day when 70% static load is added to the carton; If 60% static load is added, the carton can withstand 3 weeks; At 50%, it can withstand 10 weeks; It can withstand more than one year at 40%. It can be seen from this that if piled too high, the damage to the carton is fatal. Cake box
2、 Measures to solve the problem
（1） Measures to solve fat or bulging carton:
1. Determine the corrugated type of the carton as the appropriate corrugated type. Among type A, type C and type B corrugated, type B corrugated height is the lowest. Although the resistance to vertical pressure is poor, the plane pressure is the best. Although the compressive strength of the empty carton will be reduced after using B-type corrugated, the contents have
Support, can bear a part of the stacking weight when stacking, so the stacking effect of products is also good. In production practice, different corrugated shapes can be selected according to specific conditions. Saffron box
2. Improve the stacking conditions of products in the warehouse
If the warehouse location allows, try not to stack two shovels high. If it is necessary to stack two shovels high, in order to prevent the concentration of load when stacking the finished products, a piece of corrugated cardboard can be clamped in the middle of the stack or a flat shovel can be used.
3. Determine the exact carton size
In order to reduce the phenomenon of fat or bulging, and reflect the good stacking effect, we set the height of the carton as the same as that of the bottle, especially for the carbonated beverage carton and pure water tank with relatively high height. Apparel box
（2） Measures to solve carton damage:
1. Reasonably designed carton size
When designing cartons, in addition to considering how to use the least materials under a certain volume, the market circulation link should also consider the size and weight of a single carton, sales habits, ergonomic principles, and the convenience and rationality of the internal arrangement of goods. According to the principle of ergonomics, the proper size of the carton will not cause human fatigue and injury. The transport efficiency will be affected and the probability of damage will be increased by the heavy carton packaging. According to international trade practice, the weight of a carton is limited to 20kg. In actual sales, for the same commodity, different packaging methods have different popularity in the market. Therefore, when designing cartons, we should try to determine the size of packaging according to sales habits.
Therefore, in the process of carton design, various factors should be considered comprehensively to improve the compressive strength of the carton without increasing the cost and affecting its packaging efficiency. After fully understanding the characteristics of the contents, determine the reasonable size of the carton. Essential oil box
2. The corrugated board reaches the specified thickness
The thickness of corrugated board has a great influence on the compressive strength of the carton. In the production process, the corrugating roller is seriously worn, which causes the thickness of the corrugated board to decrease, and the compressive strength of the carton also decreases, resulting in an increase in the breakage rate of the carton.
3. Reduce the deformation of corrugated
First of all, we should control the quality of the base paper, especially the physical indicators such as the ring crush strength and moisture of the corrugated core paper. Secondly, the corrugated cardboard process is studied to change the corrugated deformation caused by the wear of the corrugated roller and the insufficient pressure between the corrugated rollers. Third, improve the carton manufacturing process, adjust the gap between the paper feeding rollers of the carton making machine, and change the carton printing to flexographic printing to reduce the deformation of the corrugated. At the same time, we should also pay attention to the transportation of cartons. We should try to transport cartons by car to reduce the corrugated deformation caused by the binding of tarpaulins and ropes and the trampling of loaders.
4. Design appropriate layers of corrugated cardboard
Corrugated cardboard can be divided into single layer, three layers, five layers and seven layers according to the number of layers. With the increase of layers, it has higher compressive strength and stacking strength. Therefore, it can be selected according to the characteristics of the goods, environmental parameters and consumer requirements.
5. Strengthen the control of the peeling strength of corrugated boxes
The bonding strength of the corrugated core paper and the face paper or the inner paper of the carton can be controlled by the testing instrument. If the peeling strength does not meet the standard requirements, find out the reason. The supplier is required to strengthen the inspection of carton raw materials, and the tightness and moisture content of the paper must meet the relevant national standards. The peeling strength required by the national standard can be achieved by improving the adhesive quality and equipment.
6. Reasonable design of carton pattern
The carton should avoid full-plate printing and horizontal strip printing as much as possible, especially the horizontal printing in the center of the carton, because its function is the same as the horizontal pressing line, and the printing pressure will crush the corrugated. When designing the printing of the carton surface, the number of color registration should be reduced as much as possible. Generally, after monochrome printing, the compressive strength of the carton will be reduced by 6% – 12%, while after tricolor printing, it will be reduced by 17% – 20%.
7. Determine appropriate paper regulations
In the specific design process of carton paper, appropriate base paper should be selected. The quality of raw materials is the main factor that determines the compressive strength of corrugated carton. Generally, the compressive strength of the corrugated box is in direct proportion to the weight, tightness, stiffness, transverse ring compression strength and other indicators of the base paper; Inversely proportional to water content. In addition, the impact of the appearance quality of the base paper on the compressive strength of the carton can not be ignored.
Therefore, to ensure sufficient compressive strength, we must first select high-quality raw materials. However, when designing the paper for the carton, do not blindly increase the weight and grade of the paper, and increase the total weight of the cardboard. In fact, the compressive strength of the corrugated box depends on the combined effect of the ring compression strength of the face paper and the corrugated core paper. Corrugated core paper has a greater impact on the strength, so whether from the strength or from the economic perspective, the effect of improving the grade performance of corrugated core paper is better than that of improving the grade of face paper, and it is much more economical. The paper used in the carton can be controlled by going to the supplier’s site for inspection, taking samples of the base paper and measuring a series of indicators of the base paper to prevent shoddy work and shoddy materials.
8. Improve transportation
Reduce the number of goods transportation and transportation, adopt the method of nearby delivery, and improve the transportation method (it is recommended to use shovel plate transportation); Educate the porters, improve their quality awareness, and put an end to rough handling; During loading and transportation, pay attention to rain and moisture prevention, and the binding shall not be too tight.
9. Strengthen the management of dealer warehouse
The principle of first in, first out shall be followed for the commodities sold. The number of stacking layers shall not be too high, and the warehouse shall not be too wet, and shall be kept dry and ventilated.