What are the types of compressive strength of cardboard?

Compressive strength refers to the maximum pressure that a material can withstand after being compressed until it is crushed. Since most packaging boxes are often stacked in multiple layers during transportation and storage, the packaging boxes are required to have a certain compressive strength to ensure that the contents are not damaged. The compressive strength of a carton mainly depends on the compressive properties of its constituent materials, so the compressive strength of the carton can be indirectly evaluated by testing the compressive strength of the material that makes up the carton, that is, the cardboard. The compressive strength of cardboard is expressed by the compressive capacity per unit length and unit area.

The main indicators to characterize the compressive strength of cardboard are ring compressive strength, flat compressive strength and edge compressive strength, as shown in the figure. Figure (a ) indicates the ring crush strength (RCT) of corrugated base paper or boxboard, Figure (b ) indicates the vertical compressive strength (CFCO) of corrugated base paper, Figure (c) indicates the vertical compressive strength of container board, and Figure (d) is the corrugated core flat Compressive strength (CMT), figure (e) is the flat compressive strength ( FCT) of corrugated cardboard , and figure (f) is the edge compressive strength ( ECT) of corrugated cardboard.

Schematic diagram of the compressive strength of corrugated cardboard