| 摘要 |
A grinding device for a resin composition, comprising a rotor (1), to the upper portion of which a molten, mixed resin composition can be fed from an opening, and which is provided on the outer periphery thereof with a punched wire mesh (2) formed of a magnetic material and/or a non-magnetic material i n contact with a magnetic material (3), wherein the resin composition is passe d by a centrifugal force through small holes in the punched wire mesh (2), uniformly heated by heating a magnetic material element, so as to be ground into fine particles or fibrous elements, and is carried by a pneumatic transporting facility (12) equipped with a rotary impeller (11) from a discharge port at the lower part of an outer tank (8) so as to be ground to a grain size closer to a final-product grain size than a grain size immediatel y after grinding is when collected in a product collecting container (13), whereby cooling is facilitated, a grinding time can be shortened without deterioration in resin characteristics, fine powder and coarse particles produced at grinding time can be reduced, and a classification step can be eliminated or requires less manpower.
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