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What does paper mill pm7 mean?

Paper mill pm7 is a double-fold paper machine. PM7 is a twin-wire paper machine with a width of 6.6m and a design speed of 1000m/min. It mainly produces corrugated paper and T paper, with an annual production capacity of about 350,000 tons. It is the widest high-speed paper machine in China independently developed and manufactured by Shanghai Liang Qing Industry.