A
sieve shaker is found useful for the separation of solid particles having substantially equal length and width dimensions from elongate shaped particles, comprising a corrugated sheet having sieve openings on the pitch between ridges and furrows of the corrugations and imperforate furrow bottoms.
Sieves and sieving apparatus have been employed for countless centuries to separate materials such as mixtures of particles having different sizes or shapes. The present invention is of an improved
sieve shaker design which separates with greater efficiency, in particular, mixtures of particle solids of substantially equal length and width dimensions from elongate particles.
As will be appreciated from the above description, the
sieve shaker of the invention possesses a sieve deck or bed which resembles an accordion in shape. The sieve perforations are located on the sides of the hills or pitched areas. The furrows or valleys are solid (imperforate) and aligned in the same direction as material flow to allow elongate shapes or other off size material to collect and slide off the screen deck without being channelled to the apertures 30. This allows the elongate shapes to orient themselves in the furrows in the direction of material flow so that they do not turn upright and slide through the openings 30. Flow may be assisted by inclining the sieve 10 in the direction of the furrows 24. At the same time, solid particles of substantially uniform dimension are swept by vibratory or gyratory motion of the
sieve shaker carrier, and roll up the pitch of area 22 in response to the motion of the sieve screen. Being of a dimension which will pass through the openings 30 regardless of which dimension is presented, passage occurs. In contradistinction, the off size (elongate) material which cannot reach the openings 30 is discharged from the edge 18 of the screen, advantageously into a scrap container.
Advantageously, the
sieve shaker of the invention is mounted on a sieve carrier which operates by either vibratory or gyratory movements imparted to the sieve.
