The structure and type of corrugated boxes are inseparable from the shape of the corrugated, as well as the size and height of the corrugated.

(1) Corrugated shape. The corrugated shape plays a decisive role in the compressive strength of corrugated cardboard. The shape of corrugated is divided into V-shaped, U-shaped and Uv-shaped according to the size of its corrugated arc, as shown in Figure 5-2.

The corrugated peak of the U-shaped corrugated cardboard is close to a circle. The characteristics of u-shaped corrugated are: soft and elastic, as long as the deformation does not exceed the elastic range, the u-shaped corrugated can quickly restore its original shape after the plane pressure is removed; the arc radius is large, the energy absorption capacity is large, and the buffer performance is good; The corrugated paper and the face paper have a high degree of firmness, but the amount of adhesive is large; the pressure resistance is strong.

The peak of the v-shaped corrugated corrugated cardboard is close to a triangle, as shown in Figure 5-2. It is characterized by high strength and small arc radius; the contact area between the corrugated top and the surface paper is small, the amount of adhesive between the corrugated paper and the surface paper is small, and it is not easy to bond and peel; The compressive strength is large and the buffering ability is weak; but when the external force is too large and the deformation exceeds the elastic range, the corrugated corrugated will be destroyed and completely lose its resilience; It is easy to cut the core paper at the peak.

The shape of uv-shaped corrugated cardboard is between u-shaped and v-shaped, with most of the advantages of v-shaped and u-shaped, its elasticity and processing performance are better than v-shaped, and the flat compressive strength and materials are excellent In the u shape, the compressive strength is higher. At present, the corrugated board used in my country basically adopts the form of uv-shaped corrugated.

Stress of v-shaped corrugated board and u-shaped corrugated board in plane compression. It can be seen from the test curve that the initial deformation of v-shaped corrugated cardboard is small in the process of compression deformation, but as the pressure increases, the amount of deformation gradually increases. crushed. In the process of compressive deformation of U-shaped corrugated cardboard, due to its good buffering performance, when it is impacted by external forces, the crushing and deformation speed is relatively slow. Uv-shaped corrugated board has both the advantages of u-shaped and v-shaped corrugated.

(2) The size and height of the corrugated. The types of corrugated cardboard are distinguished by the section of the corrugated layer, that is, the size and height of the corrugated. There are mainly six types of large corrugated A-type, small corrugated B-type, medium corrugated C-type, micro-corrugated D-type and E-type and super-large corrugated K-type.