In two production lines, the blend of molten chocolate and solid particles is then fed through double wall piping into the center inlet of one screener dedicated to dark chocolate, or the other dedicated to white chocolate. Imbalanced weight gyratory motors impart multi-plane inertial vibration, which accelerates the rate at which molten chocolate passes through 1020 µm (17-mesh) apertures in the screen, and the rate at which solid particles travel across the screen and exit through a discharge spout at the screen’s periphery. Molten chocolate passes through the screen in less than one minute and cools by no more than 0.5°C (0.9ºF), preventing it from solidifying. Vibration starts automatically when the pump feeds the screener, and runs for a pre-set time once the pump has stopped. Each screener can handle 150 kg (330 lb) per hour.