GB/T 12659-2008 "Pulps—Laboratory beating—Jokro mill method" specifies the method for laboratory beating of pulp using the Jokro mill, which is applicable to various types of pulp. A pulp suspension at a specified concentration is placed in the beating tank, and beating is achieved through the interaction between the inner wall and the fly knife roller. The standard defines parameters such as beating concentration, time, revolutions, and sample preparation requirements. This method is used to simulate the pulp beating process in the laboratory and evaluate beating performance.