Tobacco leaf sorting equipment - uses light receiver detecting visible colour by amount of light reflected

摘要

The process sorts the leaves in accordance with their visible colour by means of a light receiver. The leaves are led past the receiver, whose spectral sensitivity is set to a wavelength inside which the reflection curve of the leaf reverses with increasing wavelength. The leaves are classified in accordance with their degree of reflection in relation to this reversal point. The reflection can be transformed into a signal proportional to it in a first unit, while a second unit with a barrier cct. and a capacitor generating an impulse signal controls solenoid operated sorting devices to eject the leaf responsible from the material.