This is the real reason why the cartons are bulgin

2022-07-23
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Here are the real reasons for the customer's most annoying carton bulge and damage

release date: Source: Carton micro vision editor: number of views of the package: 3390 copyright and disclaimer

core tip: there are two main problems in the use of cartons: fat or bulging and carton damage. Next, WA will analyze the causes of the problems:

[China Packaging News] during the use of cartons, there are two main problems: fat or bulging and the damage of cartons. Next, WA will analyze the cause of the problem:

fat bag or bulging bag

1 Improper selection of ridge type

a tile has the highest height. Although the same paper has good vertical pressure resistance, it is not as good as type B and type C in plane pressure resistance. After the cartons of tile a are loaded with products, the cartons will be subject to horizontal and vertical vibration during transportation. 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 that the relatively stable load acts on the cartons within a considerable period of time, and 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 bottom stacked on the shovel often swell and some of them will be crushed. When the carton is under vertical pressure, the deformation of the center of the carton surface is the largest, and the crease after crushing is like a parabola. 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, causing a concentrated load in the middle of the carton, which will cause the carton to crack or permanent ① the control mode adopts intelligent expert setting system deformation, etc. In addition, due to the too wide gap between the shovels, the corners of the cartons fall in, which will cause more than 3/4 of the cartons to be full 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 carton wall thickness 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. Case 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 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 length 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 carton is large, and the requirements for the carton are also high. It is necessary to have high compressive strength and bursting resistance to ensure the use performance of the carton. Otherwise, the carton is 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 tile 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. When the perimeter of the four sides of the carton remains unchanged, the compressive strength decreases by about 20% with the increase of the carton height

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

due to the wear of the corrugated roller in the use process, the thickness of the corrugated board can not meet the specified requirements, resulting in the low compressive strength of the carton and the decline of the carton strength

3 Corrugating deformation of cartons

the cardboard that produces corrugating deformation is soft, with low plane strength and rigidity. The corrugated cartons made of such cardboard 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 removed, 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, the ridge shape will be damaged and cannot be restored after the pressure is removed. UV type adopts the advantages of the above two types of corrugated type. It has 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 ridge peak bonding point, 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 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, the whole cardboard will be crushed in order to perform forced and clear printing at the line pressing position, which will greatly reduce the compressive strength of the carton. 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 pressing 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. When the general carton is fully printed, its compressive strength decreases by about 40%

7. The paper regulations for cartons are unreasonable and the paper does not meet the requirements

in the past, the goods were mainly handled manually in the circulation process, the storage conditions were poor, and the goods were mainly in bulk, so 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 taken as the condition, and the stacking strength is tested

if the minimum compressive strength is not taken into account during the design and determination of the paper for the carton, the paper for the carton cannot reach the required compressive strength, which will lead to a large number of damage to the carton. There are clear regulations on the paper quantity of each kind of carton. It is stipulated that the supply can only be provided with high allocation, not low allocation, when changing paper

8. The impact of transportation

many reasons for the damage of commodities 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 turbulence. As there are many transportation links, the impact on the cartons is great. In addition, the backward transportation mode and the rough loading and unloading, trampling and falling of the handling personnel 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. The carton has 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 decline linearly

dealers often pile up goods very high due to the small warehouse location, and some even pile the 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; When 40% is added, Zhongwang can provide a series of services from automobile shape design, material structure design, aluminum body production line design, simulation analysis, sample vehicle output, etc. for more than one year. It can be seen from this that if the pile is too high, the damage to the carton will be fatal

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