Corrugated box is one of the most widely used packaging products, and its consumption is always the first of all kinds of packaging products. Its superior application performance and good processing performance gradually replace the wooden case and other transport packaging containers, and become the main force of transport packaging. It not only maintains the goods, is convenient for storage and transportation, but also beautifies the goods and propagandizes them. In fact, the different structure of corrugated box has a great relationship with its strength. Let's understand it together:
1. Box shape: the corrugated box has different shapes and different compressive strength. The biggest supporting force of the box is that the four corners in the box and the side next to the corner, that is, the supporting force of the square box is relatively larger. In addition, the longer the circumference and the higher the height of the box, the lower the compressive strength. The larger the opening area and the closer it is to the corner, the lower the compression resistance of the box.
2. Type of corrugated box: according to gbt6544-1999, UV corrugated board is divided into four types: A, C, B and E. A corrugated is high and wide, so it is called "big corrugated". The flat pressure performance of a corrugated box is worse than that of B and C corrugated boxes, but the vertical pressure performance of a corrugated box is higher, which is more suitable for manufacturing Cartons containing non pressure resistant articles. The height of C-shaped corrugated box, the number of corrugated boxes per unit length, and its performance are between a and B-shaped corrugated boxes, which are also known as thin corrugated boxes, and are suitable for containing ordinary articles. B-shaped corrugated box is low and dense, so its vertical pressure resistance is poor, but its plane pressure resistance is high, so the box made of B-shaped corrugated board is suitable for containing bottled food, etc. E-shaped corrugated board is low and fine, so it is also called micro corrugated. E-corrugated paperboard has the characteristics of light weight, good cushioning performance and good plane compressive strength, which is conducive to stop printing directly.
3. Wave form of corrugated box. The wave form of corrugated box refers to the shape of upper and lower top ends of corrugated box and their connecting lines. There are three types of wave forms of corrugated box: U-shaped, V-shaped and UV shaped. The U-shaped corrugated board has an arc shape. This kind of corrugated board has good cushioning and elasticity. The slight deformation of the corrugated board can be recovered quickly, and the top of the corrugated board is not easy to break. But the accepted pressure is worse than that of V-shaped corrugated board, and the amount of core paper and adhesive is more. The V-shaped corrugated box has a triangular shape. The V-shaped corrugated box is composed of straight lines. It has the advantages of small amount of core paper and adhesive, and it has the good characteristics of consolidation and durability. Its plane compressive strength is significantly higher than that of the U-shaped corrugated box, but once the corrugated box is compressed and deformed, it is difficult to recover.
The strength of corrugated box is an important technical index for the quality inspection of packaging containers. On the one hand, these indexes reflect the quality level of the original materials, on the other hand, they also reflect the quality of the processing technology. It is of great significance to correctly understand and understand the relevant conditions affecting the strength of corrugated box, to better stop consumption and improve the quality of production.