METHOD FOR DETECTING MOISTURE IN PLASTIC MATERIAL AND SYSTEM FOR REMOVING MOISTURE FROM PLASTIC MATERIAL

摘要

To provide: a method for detecting moisture in a plastic material which can measure the moisture content in a plastic material accurately and rapidly; and a system for removing moisture from a plastic material. Solution A plastic material (13) of which the moisture containing state is clearly found is irradiated with an electromagnetic wave of a band of 50 1000 GHz by means of an oscillation unit (11) and a residue of the residual electromagnetic wave which is not absorbed by the plastic material (13) is received and measured by means of a receiver (12) thereby acquiring a first measurement value in advance. The plastic material (13) of which the moisture containing state is not found clearly is irradiated with an electromagnetic wave of the above mentioned band by means of the oscillation unit a residue of the electromagnetic wave which is not absorbed by the plastic material (13) is received and measured by means of the receiver (12) thereby acquiring a second measurement value. The first measurement value and the second measurement value are compared with each other and the moisture containing state of the plastic material of which the moisture containing state is not found clearly is calculated on the basis of the result of the comparison.