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On November 25, after seven days of continuous intensive efforts, Guangdong Petrochemical’s 500,000 tons per year polypropylene production facility was able to resume production of the high-melting-point polypropylene fiber material PP-HY0370; to date, 2,800 tons of this material have been produced. The production of these products has effectively filled the supply gap in the fiber materials market in South China, further strengthening Guangdong Petrochemical’s pivotal position in this regional market, and also laying the foundation for expanding into broader markets. It is understood that polypropylene high-melt fiber resin features strong rheology and great difficulty in granulation. Especially when production is carried out on the world’s largest granulation units, risks such as blade entanglement, blade jamming, and even \"intestinal irrigation\" are more likely to occur. During the process of changing production, as the peroxide concentration increased, large pieces, sheets, and clumps appeared on multiple occasions; this not only affected product quality but could also lead to issues such as tool jamming and tool retraction. Meanwhile, during the process transition, the extrusion granulator also experienced frequent abnormalities due to issues such as mismatched process parameters and feed fluctuations, forcing it to shut down multiple times for repairs before being restarted. Frequent start-ups and shut-downs not only disrupt the normal production rhythm and increase the workload, but also place higher demands on on-site coordination and teamwork among various teams. In the face of these challenges, Guangdong Petrochemical attaches great importance to them, and the daily morning coordination meetings are used to focus on planning tasks related to the shift in production. Hu Gang, head of the department’s production process, has repeatedly emphasized: “We must uphold the ‘nail-driving’ spirit—making breakthroughs step by step and resolving issues one by one.” By not giving up easily and pooling the efforts and wisdom of everyone, we will surely succeed. ”To this end, Guangdong Petrochemical established a dedicated task force for the PP-HY0370 production switchover. By precisely controlling parameters such as the temperature of the extruder die, the speed of the pelletizer, the mesh size of the screen changer, and the opening degree of the throttle valve, single-variable control was implemented to advance the production switchover process in an orderly manner, successfully overcoming issues such as uneven material discharge from the die after the addition of peroxides and problems related to the pelletizer’s cutting knives. The task force also employed scientific and quantitative methods to monitor in real time the formation rate and size of large pieces, and organized specialized teams to conduct cause analysis, ultimately overcoming the technical barriers to the formation of such large pieces. In addition, Guangdong Petrochemical has also carried out comprehensive optimizations to the start-up and shutdown procedures, in order to reduce the impact of frequent starts and stops on the system. The equipment staff should enhance the monitoring of the condition of key components such as the main motor of the extruder, the gearbox, and the cutting knives, to ensure that the equipment remains in good working condition at all times. (Hao Shushan)