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The compressive strength of the carton is divided into effective and final values. The change of force during the compressive test is sometimes from slow to fast to the point of collapse, and some of it is gradually increased to the point of collapse. In the long-term compressive tests, we found that the change in the force value sometimes has a certain buffer: that is, when the force value and the deformation amount increase to a certain extent, the force value stops and the deformation amount continues to increase. After a period of time, the force value continues. Increase until the collapse of the carton. We can refer to the force value before buffering as the effective force value, and the deformation amount before buffering is called the effective deformation amount. After buffering, although the force value can continue to increase, but the carton has begun to deform, can not meet the requirements for use, so the standard for determining the compressive strength of the carton should be the effective value of the compressive test.