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Mass production of high-melting random copolymerized PP by Ningxia Coal Industry achieved Author/Source: Sinochem New Network Date: April 24, 2023 Clicks: 12 As of April 19, more than 7,000 tons of high-melting random copolymerized polypropylene (PP) of grade K4860, produced by the First Olefin Branch of Ningxia Coal Industry, have been manufactured in bulk, thus achieving stable mass production. It is understood that K4860 is an injection-grade polypropylene product with high transparency; its melt index is 65 grams/10 minutes. It features short injection molding cycles, easy demolding, high production efficiency, and low energy consumption, making it suitable for manufacturing large or deep-cavity, thin-walled containers. Since April 2022, the company’s technical staff have, by drawing on the production experience of leading domestic manufacturers and overcoming the limitations of the patent holder’s process packages, customized various production parameters, technical specifications, and formulas. During the production of K4860 grade polypropylene products, the operators followed the switching plan step by step, strictly controlling the operating parameters of the reactor as required. They overcame issues such as the high viscosity of the polymer powder, excessive fine particles, poor flowability, difficulties in parameter control, and frequent blockages in the discharge bin. As a result, the melt index was able to undergo significant changes, rising from low levels to high levels and then back again, with stable switching throughout the entire process.