Drying, dehumidifying apparatus of the microwave type for the rapid and continuous drying of plastic material, e.g. granules, pellets or flakes, for feeding an injection or extrusion moulding system

摘要

Drying, dehumidifying apparatus (10), of the microwave type for the rapid and continuous drying of plastic material, in granules, pellets or flakes, for feeding an injection or extrusion moulding system of products in plastic material. The apparatus (10) comprising a container body (100) of a tower-like cylindrical shape, whose upper part by means of a mouth (111) is used to load the plastic material. Coaxially with respect to said container body is placed a vertical rotating shaft (200) for mixing plastic material. Peripherally with respect to said container body (100) some microwave generating devices (300,310) are mounted. The lower part of said container body is provided with an ambient air heater device (400) in such a way that the air introduced into said heater device (400), is first heated, then crossing a sintered filter (420), dehumidified introduced in correspondence of the base of said container body (100) in the container body (100) itself of said plastic material. Sensor means of product presence (500), of material temperature (510) and control, of process air temperature after the heater device, interact, provide data to a control logic unit of said apparatus (10).