The bending strength of paper corner guards generally refers to their ability to maintain structural stability when subjected to bending or squeezing forces. This bending strength is usually affected by the following factors:

1. Material type: Paper corner protectors can be made into different types of cardboard, such as corrugated board, kraft board, etc. Different types of cardboard have different strength properties and therefore different bending strengths.

2. Thickness of cardboard: Thicker cardboard usually has higher bending strength. In the design of corner guards, the appropriate cardboard thickness is often selected to meet specific packaging needs.

3. Internal structure: For corrugated cardboard corner protectors, the internal corrugated layer structure is crucial to resist bending strength. More corrugated layers usually increase the strength of the corner guard.

4. Shape and design of corner protectors: Paper corner protectors of different shapes and designs may exhibit different properties in terms of resistance to bending. For example, a V-shaped or U-shaped corner guard may have better bending resistance in some directions, while an L-shaped or rounded corner guard may be stronger in other directions.

5. Usage environment and application: The bending strength of corner protectors is usually affected by the use environment and application. For example, corner guards for packaging of heavy-duty products require higher bending strength, while packaging for light-duty products can use lighter corner guards.

Manufacturers of corner guards typically test their products and provide data on bending strength so customers can choose the type and specification of corner guards that suit their needs. In packaging design, it is important to ensure that you choose corner protectors with sufficient bending strength to prevent damage to the package during transportation and storage.