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It is very important that adjust the working gap between ring die and roller properly. Generally, the gap between the ring die and roller is 0.1-0.3mm. Usually, Adopt bigger gap between the new roller and new ring die, Adopt smaller gap between the old roller and old ring die, Adopt bigger gap when use big hole ring die, Adopt smaller gap when use small hole ring die, Adopt bigger gap when pelletize easily, Adopt smaller gap when pelletize hardly, to operator, if have actual experience, He would choose and adjust the gap between ring die and roller expertly.