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Talk about the reasons and Countermeasures for the bulging and damage of cartons

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core tip: in the use of cartons, there are two main problems: first, fat bags or bulging; 2、 Carton damage. We analyze the causes of the problem as follows: first, the cause of the problem

the height of a tile is the highest. Although the same paper has good performance of withstanding vertical pressure, it is not as good as type B and type C in withstanding plane pressure. After a-tile cartons 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 of cartons, the strength change of cartons, especially the bottom cartons, is a "creep" process, which is characterized by the relatively stable load acting on the cartons within a considerable period of 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 be damaged. Therefore, the cartons at the lowest layer stacked on the shovel often swell and some of them are crushed. When the carton is under vertical pressure, the central deformation of the carton surface is the largest, and the crease after crushing appears as a parabola, which is bulging. The test shows that when the corrugated box is under pressure, 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, 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 carton height of carbonated beverage boxes and water tanks is generally determined as the bottle height of the bottles containing the contents plus about 2mm. As the cartons are stacked, they bear static loads for a long time and are impacted, vibrated and bumped during transportation, the thickness of the carton wall becomes thinner and a part of the height is increased, making the carton height much higher than the bottle height, so the fat or bulging of the carton is more obvious

a large number of cartons are damaged mainly due to the following factors:

1 The 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 packed and the bottle height. 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 sensitive pressure load of high carbon steel and non-ferrous 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 cartons are also high. It is necessary to have high compressive strength and bursting resistance to ensure the use performance of cartons. Otherwise, cartons are more likely to be damaged in the circulation process. On the market, 596ml × The 24 bottles of pure water tanks are the most damaged among all cartons because of their large gross weight and single watt cartons, which are prone to damage during circulation

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 perimeter of the four sides of the carton unchanged, the compressive strength decreases by about 20% with the increase of the carton height

2. The thickness of corrugated board can not meet the requirements

because the corrugated roller will be worn during use, the thickness of corrugated board can not meet the specified requirements, making the compressive strength of the carton low, and the strength of the carton will also decline

3. Corrugated deformation of cartons

the cardboard that produces corrugated deformation is soft, with low plane strength and rigidity. The corrugated cartons made of such cardboard also have 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 extensibility, elasticity and high energy absorption. Within the elastic limit, it can still be restored to its original state after the pressure is eliminated, but the flat compression strength is not high because the force point of the arc is unstable. The V-shape has small contact with the paper surface, poor adhesion, and is easy to peel off. With the help of the resultant 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 it bears, the ridge shape will be destroyed and cannot be restored to its original state after the pressure is removed. UV type takes the advantages of the above two kinds of corrugated type, with high compressive strength, good elasticity and elastic recovery ability. It is an ideal corrugated type

4. Unreasonable design of cardboard layers of cartons

unreasonable design of cardboard layers will lead to an increase in the damage rate of outer packaging cartons. 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 packed goods

5. The adhesive strength of the carton is poor

to judge whether the carton is well bonded, as long as the adhesive surface is torn by hand. If the original paper surface is found to be stripped, it indicates that the paper is well bonded; If there is no torn paper fiber or white powder at the bonding place of the ridge peak, 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, and the size of pressure and bearing area is a major factor affecting the compressive strength of cartons. 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 cardboard 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 a wetting effect on the paper surface, which reduces the compressive strength of the carton. Generally, when cartons are fully printed, their compressive strength decreases by about 40%

7. The regulations on the use of paper in cartons are unreasonable and the use of paper does not meet the requirements

in the past, goods were mainly handled manually in the process of circulation, and the storage conditions were poor, and they were mainly in bulk. Therefore, the burst resistance and puncture resistance were taken as the main standards to measure the strength of cartons. With the mechanization and containerization of transportation and circulation means, 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 withstand is the condition, and the stacking strength is tested

if the minimum compressive strength is not considered in the process of determining the design of carton paper, the carton paper cannot reach the required compressive strength, which will lead to a large number of carton damage. There are clear regulations on the paper quantity of each kind of carton. When changing paper, the supply can only be high allocation, not low allocation

8. The impact of transportation

many reasons for the damage of commodities in the circulation process are caused by improper transportation or loading. The packaging of some products should be well recorded and protected. Although the extrusion pressure is inspected at the same time to ensure that the system pressure is not too high, and the high requirements have been met, the damage will still occur. In addition to the unreasonable packaging design, the reason is mainly related to the choice of transportation means and methods. The impact of transportation on the compressive strength of cartons is mainly impact, vibration and turbulence. Due to the many links of transportation, the impact on the cartons is large, coupled with the backward transportation mode, and the rough loading and unloading, trampling and falling of the handling personnel, which are easy to cause damage

9. Poor management of the seller's warehouse

due to the short performance time of the carton, the compressive strength of the corrugated carton in circulation will decrease with the extension of storage time

in addition, the humidity in the warehouse environment also has a great impact on the strength of cartons. Cartons have the function of draining and absorbing moisture in the environment. The relative humidity in the warehouse environment is very high, and the strength of corrugated boxes will plummet

dealers often pile up goods very high due to the small warehouse location, and some even pile goods on 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%, then add 70% static load to the carton, and the carton will collapse in one day; If 60% static load is added, the carton can withstand 3 weeks; When 50% is added, it can withstand 10 weeks; Plus 40%, it can withstand more than one year. It can be seen from this that if the pile is too high, the damage to the carton is fatal

II. Measures to solve the problem

measures to solve the fat or bulging of cartons:

1 Determine the corrugated type of the carton as the appropriate corrugated type

among type A, type C and type B corrugated, the corrugated height of type B is the lowest. Although the vertical pressure resistance is poor, the plane pressure is the best. Although the compressive strength of the empty cartons will decrease after using B-type corrugated, the contents are self-supporting and can bear part of the stacking weight when stacking, so the stacking effect of the products is also good. In production practice, different ridge types can be selected according to specific conditions

2. Improve the stacking conditions of products in the warehouse

if the warehouse location allows, try not to stack two shovel plates high. If it is necessary to stack two shovel plates 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 plate 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 carton height as the same as the bottle height, especially for carbonated beverage cartons and pure water tanks with relatively high carton height

measures to solve carton damage:

1 Design reasonable carton size

when designing cartons, in addition to considering how to use the most materials under a certain volume, we should also consider the restrictions of market circulation on 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 overall dimension of the carton will not lead to human fatigue and damage. The transportation efficiency will be affected and the damage probability will increase if the cartons are too heavy. 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 the package according to the sales habits

therefore, in the process of carton design, various factors should be comprehensively considered 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

2. The thickness of corrugated board reaches the specified thickness

the thickness of corrugated board has a great impact on the compressive strength of cartons. In the production process, the corrugating roller is seriously worn, causing the thickness of corrugated board to decline, and the compressive strength of cartons to decline, resulting in an increase in the damage rate of cartons

3. Reduce the deformation of corrugation

first of all, it is necessary to control the quality of the base paper, especially the physical indicators such as the ring compression strength and moisture of the corrugated core paper.

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