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Quadro Engineering has been the trusted partner of the worlds leading pharmaceutical, food and chemical processing companies for over four decades. It all began in 1976 with the Comil , the original conical mill. A revolutionary concept at the time, that has since evolved into the global processing standard. Oct 01, 2019 The plastics were ground by using a ball mill (Planetary ball mill PM400, Retsch, Hahn, Germany). PP pellets (15 g) and 7 agate balls (d 20 mm) in conjunction with 125 mL agate grinding cups. Rotation speed and milling time were set to 400 rpm and 1 h.
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