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به صورت جفت جفت قرار دارند که دانه ی گندم در فاصله بین آنها قرار گرفته و خرد و نرم می شود. در سیستم های انگلیسی شیارها به طور مورب و موازی قرار دارند اما در سیستم های آمریکایی شیارها به طور افقی و موازی هستند. فاصله ی بین دو غلتک قابل تنظیم است و در غلتک های رویی فاصله کمی کمتر از قطر دانه و در غلتک های بعدی به تدریج از این مقدار کمتر می شود. در هر...
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