A backflushable filtering apparatus for a molten material, particularly
for a plastic melt, comprises a housing (1) in which a sieving
arrangement (17) is provided which includes at least two sieving sections
(16) separated from one another. The melt to be filtered is supplied to
the sieving sections (16) through at least one distributor (3). The
distributor (3) includes at least one control body (9) for backflushing
which is moveable within a housing (53) that is provided with an inlet
opening (4) for the material to be filtered. The control body (9), in a
filtering position, unblocks the influx of material to be filtered to all
sieving sections (16) through connection channels (23). However, in a
backflushing position, the control body (9) interrupts the influx of
material to the filtering section (16) to be backflushed and
interconnects the connection channel (23) of the sieving section (16)
flushed back with a discharge channel (28) located in the control body
(9). At least the majority of the circumference of the control body (9)
is surrounded by a distribution space (7) for the material to be filtered
which is situated within its housing (53). The distribution space (7) is
connectable through the connection channels (23) to all sieving sections
(16) in communication with the distributor (3). Guiding channels (6) lead
from the inlet opening (4) to the regions of the two front ends (61, 62)
of the distribution space (7). These front ends (61, 62) are situated in
the region of the outermost connection channels (23) or outside the
region of all connection channels (23). The discharge channel (28), which
leads away from the control body (9), may be caused to communicate with
the connection channel (23) of the respective sieving section (16) to be
flushed back through a flush back channel (27) of at least one
cross-piece (14) of the control body (9) which overbridges the
distribution space (7).