Corrugated box has good stiffness, strength and buffer performance, with green environmental protection, low cost, convenient transportation and storage, and other advantages, has gradually been replaced by wooden case packing container, become the main force of the transport packaging. To ensure the contents in the storage, transportation process in the hair damage, all the intensity indexes of corrugated carton to meet the requirements of using. Compressive strength as an important indicator of corrugated carton, can reflect the overall performance of the process of the whole system box and corrugated box inner strength quality. Therefore, study on the compressive strength for improving the performance of corrugated carton, reduce logistics damage rate, reduce the consumption of raw materials etc. has very important significance Righteousness.
Influencing factors of compressive strength of corrugated box
1 corrugated box manufacturing process
Is bigger to the influence of the farther the effect of vertical and parallel to the loss of the corrugated box manufacturing process including printing, die-cutting indentation, open hole process. Area of printing and printing pressure, corrugated carton compressive strength is high. When the indentation line and a corrugated cord, indentation process of corrugated carton compressive strength of the less affected; but when the indentation line corrugated corrugated, corrugated carton compressive strength indentation process of great influence. In addition, studies have shown that, corrugated carton opening location away from the center of the carton closer to corrugated carton compressive strength is small; from the center of the carton, corrugated carton compressive strength. Need to pay attention to in the corrugated box is arranged at the upper end of the pore At the lower end of the opening of its impact on the compressive strength of greater.
2 corrugated box structure
At present in corrugated box with different structures on the compressive strength are different. The effect of mainly concentrated in the corrugated carton length to width ratio, height and girth 3. Test data show that the length width ratio of corrugated carton compressive strength has a very obvious effect in corrugated carton perimeter and a certain height, length and width ratio from 1.0 to 2.0, corrugated carton compressive strength first increased and then decreased trend, when the length width ratio of about 1.4, corrugated carton compressive strength reached the maximum. When the corrugated carton height is higher, the stacking stability becomes poor, compressive strength will be decreased. In addition, corrugated paper Box＇s compressive strength and the perimeter of positive correlation, that in a certain range, long corrugated carton week Changyue, compressive strength is high, whereas compressive strength is low.
3 properties of corrugated paper and paper
Raw materials for corrugated carton is corrugated carton compressive strength is one of the important factors, mainly manifested in two aspects: on the one hand, the quality of corrugated paper and paper core and collocation is reasonable for corrugated carton compressive strength has a significant effect; on the other hand, Corrugating Medium comprehensive synthetic ring pressure strength and corrugated carton compressive strength showed a significant linear relationship.
4 environmental conditions for storage and transportation of corrugated boxes
(1) the effects of humidity: domestic corrugated base paper mostly with straw pulp as raw material, main components of cellulose, hemicellulose and lignin, and glucosamine as constitute the basic chemical unit of these components, cellulose, semi cellulose, wood element has strong hydrophilicity. Therefore, environment humidity of corrugated cardboard the mechanical properties of the impact is more significant. The researchers used finite element method to study the influence of environmental humidity on compressive strength of corrugated box, the results show that, corrugated carton compressive strength decreases with the increase of the environmental humidity and decreasing amplitude is more obvious.
(2) stacking effect: in order to reduce the cost of logistics, many businesses will be to improve the utilization rate of packaging volume by increasing the stacking height. But in under the action of gravity, the upper part of the goods will put pressure on the below goods, this pressure will of corrugated carton compressive strength caused some damage, and the damage degree and time of stack and stack method has great relationship. Studies have shown that, corrugated carton compressive strength decreased with the prolonging of time of stack and reduce. And influence on compressive strength of corrugated box is different in different stacking modes, common stacking patterns have staggered stacking and overlapped and stacked two, overlapped and stacked, due to the corrugated carton box angle under the pressure In this case, the maximum compressive strength is the highest.
(3) handling and transportation in the process of vibration and shock effects: in recent years, mechanical loading and unloading in logistics transportation gradually gained popularity, but this will undoubtedly increase the goods in circulation in the process of force from shock and vibration frequency. The actual transport, corrugated box vibration and impact strength and the means of transport and transport distance and so on. In railway transportation, vibration and impact strength is mainly influenced by the transport distance, transport distance is long, corrugated box vibration impact is strong. In automobile transportation, vibration and impact strength is not only influenced by the transport distance, and road conditions, speed, the goods in the car position, etc. Factors related.
The greater the impact strength of the vibration in the process of transport, the greater the impact on the compressive strength of corrugated box, in the loading and unloading process, the four corners of the corrugated box and the edge of the impact of its compressive strength is also very large.
Design of compression strength of corrugated box
In transport packaging design, to achieve the highest intensity, the cost minimum packaging, you need to fully understand the product circulation environment, comprehensive consideration of various factors to design a variety of programs, through experiments to determine the optimal scheme. The compression strength of corrugated box design need to consider many factors, such as corrugated carton content types, quantity, weight, arrangement of, and body length and width high size. This can be according to the national standard GB / T 6543-2008< transport packaging used single corrugated boxes and double corrugated treng carton > corrugated carton should meet the lowest compressive strength calculation method, according to the different product design The compressive strength of corrugated box.
1 box type selection
GB / T 6543-2008 lists a wide variety of corrugated carton box type, in actual use can be according to the content choosing suitable type of box. After a comprehensive comparison, 0201 corrugated raw material saving, easy processing, convenient use, in the transportation of the products is widely used.
