In this diagram the areas EA and EB represent the specific energy imparted in the refiner. They represent the product of the number of impacts and the intensity per impact, the two areas are identical.
When the intensity per impact is high and the number of impacts low, it is common to refer to the refining operation as being "high intensity". In the case of the opposite situation, it is referred to as "low intensity". For tensile strength development in fine softwood kraft fibres like those from Canfor Pulp, low intensity refining gives the best results.