Method for unclogging an extruder
OwnerHubert Juilletinventor
Life of this patent
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Abstract
A method for unclogging the openwork sheath of screw extruders used for sludge densification. The sheath is formed by a stack of superposed elements that are spaced apart from one another by elastic spacers, the latter creating a gap between each of the elements. The liquid and gaseous fractions contained in the sludge are expelled through the gaps. The stack is compressed during an extrusion cycle, with the spacers thus being squashed, thereby reducing the thickness of the gaps. During an unclogging cycle, the pressure is released, the spacers then returning to their original thicknesses and in this way increasing the size of the gaps, thus making it easier to unclog the latter.
Claims6
A method for unclogging a slotted barrel of screw extruders used for sludge densification, each of said slotted barrels comprising a stack of hollow elements spaced apart by spacers, thus creating slots between said hollow elements through which liquid and gaseous fractions are expelled radially by virtue of pressure prevailing in said barrels under the effect of the rotation of said screw extruders, wherein:
- said spacers exhibit an elasticity,
- said elasticity allows said spacers to be compressed in order to reduce their thickness,
- a reduction of said thicknesses results in a reduction of a width of said slots,
- compression of said spacers is produced by an axial pressure exerted on said stack of hollow elements,
- said pressure is exerted during an extrusion cycle, and
- said pressure is relaxed during an unclogging cycle, thus facilitating the latter.
Dependencies are inferred from the claim text.