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This article compares two essential rubber processing machines: the open mill mixer and the internal mixer. An open mill uses two exposed rollers for basic rubber mastication and mixing, offering low cost but requiring high labor and causing environmental concerns. In contrast, an internal mixer (e.g., Banbury mixer) operates in a closed system with intermeshing rotors, enabling higher efficiency, better product quality, reduced labor, and improved environmental protection. Though more expensive, internal mixers are increasingly favored for their automation potential and mixing performance. With advancements in technology, they are expected to gradually replace traditional open mills.
