Discharge device for mixing and discharging solids of thermoplastic substance and fibers and plasticizing device having this device

A plasticizing device comprising a discharge device for discharging solids of a thermoplastic substance and fibers and a transfer device for accepting said discharged solids and fibers and transferring them downstream,

• wherein said discharge device comprises,
• a discharge passage longitudinally extending downward to a lower end thereof and becoming narrower in diameter toward the lower end, said discharge passage having an inner wall surface forming a passage opened at the lower end;
• a solid supply means for supplying the solids of the thermoplastic substance to a first position in said passage;
• and
• fiber supply means for supplying the fibers to a second position in said passage;
• a means for sensing upper and lower limits of a level of a top surface of material accumulated in said passage which controls the start and stop of both said solid supply means and said fiber supply means;
• wherein a cross line on which a part of said inner wall surface extending downward from an upper one of said first position and said second position intersects a vertical plane passing through the opened end of said passage forms an angle of 0 to 30° with respect to a vertical line, or all tangent lines for said cross line form angles from 0 to 30° with respect to a vertical line, and
• said transfer device comprises
• a cylinder having an opening facing the lower end of said discharge passage, said opening forming a circle when vertically projected on an imaginary horizontal plane, and
• a screw provided in said cylinder for transferring the solids of the thermoplastic substance and the fibers supplied from said opening,
• wherein when the outside diameter of said screw is taken as a, the diameter of the bottom of a groove of said screw is taken as b, and the width of said groove is taken as c,
• said value c is equal to or smaller than the diameter of the projected form of said opening and the following expression is satisfied:
• {(a/2)2Π−(b/2)Π}×c≧350 cm3.