Causes and Countermeasures of carton bulging and d

2022-08-01
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Causes and Countermeasures for the bulging and damage of cartons

during the use of ink "> cartons, there are two main problems: first, fat or bulging; second, the damage of cartons. We analyze the causes of the problems as follows:

first, the causes of the problems

(I) Fat or puffy

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 a phenomenon

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 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 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

(II) a large number of cartons were 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 length of the case is the diameter of the number of bottles in the rectangular direction, and the width of the case is the number of bottles in the wide direction; Establish mutual assistance relationship with peer enterprises, 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 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. In the market, the 596ml 24 bottle pure water tank is the most damaged among all cartons because of its large gross weight and single tile carton, which is easy to be damaged in 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 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 carton

unreasonable design of cardboard layers, Will cause external ink "> the damage rate of packaging cartons has increased. Therefore, the number of cardboard layers used in the cartons 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 cartons is poor.

to judge whether the cartons are well bonded, it is only necessary to tear the bonding surface by hand. If the original paper surface is stripped, it indicates that the paper is well bonded; if there is no torn paper fiber or If it is white powder, it means that it is false sticky, 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. Ink of carton "> unreasonable printing design

the corrugated shape and structure of the corrugated board determine the pressure bearing capacity of the corrugated board. Printing will cause certain damage to the corrugated board, and the size of the pressure and the 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 corrugated board and reduce the height of the corrugated board. Especially when printing at the line pressing position, in order to carry out forced and clear printing at the line pressing position, the The whole cardboard is crushed, which greatly reduces 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; It can withstand more than one year when 40% is added. It can be seen from this that if the pile is too high, the damage to the carton will be fatal

II. Measures to solve problems

(I) measures to solve the fat or bulging of cartons:

1 To determine the corrugated type of the carton as appropriate, it is important to find a way to solve the problem. Among type A, type C and type B corrugated, type B corrugated height is the lowest. Although the vertical pressure resistance performance is poor, the plane pressure is the best. After the B-type corrugated box is adopted, although the compressive strength of the empty box will decrease, the contents have self

support 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 spades high, in order to prevent the load concentration during the stacking of finished products, a piece of corrugated cardboard can be clamped in the middle of the stacking or a flat spade 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

(II) it has had a far-reaching impact on the design and effectiveness of modern passenger cars. 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 the 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. Overweight ink "> carton packaging will affect the transportation efficiency and increase the damage probability. According to international trade practices, the weight of a carton is limited to 20kg. In actual sales, different packaging methods have different popularity in the market for the same commodity. Therefore, when designing cartons, we should try to determine the size of the packaging according to sales habits.

therefore, in the process of carton design, we should comprehensively consider various factors without increasing the cost, Improve the compressive strength of the carton without affecting its packaging effect. After fully understanding the characteristics of the contents, determine the reasonable size of the carton

2. The thickness of corrugated board has a great influence on the compressive strength of cartons. In the production process, the corrugating roller is seriously worn, resulting in the decrease of the thickness of the corrugated board and the compressive strength of the carton, resulting in the increase of the damage rate of the carton

3. Reduce corrugation deformation

first of all, the quality of the base paper should be controlled, especially the physical indexes such as ring compression strength and moisture of the corrugated core paper

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