Liquid purification or separation – Processes – Separating
Patent
1994-04-08
1996-04-09
Dawson, Robert A.
Liquid purification or separation
Processes
Separating
210781, 210175, 210186, 2103601, 2103801, 210484, 210485, 2104931, 354324, 354326, 494 36, B01D 3518, B01D 3306
Patent
active
055058639
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the processing of waste washout liquid containing liquid washable photopolymer from a plant for manufacturing a printing, especially a relief printing, plate using a filter unit of the rotary gravitational separator type, that is to say, of the centrifuge type. In particular, the invention relates to a filter unit comprising such a filter, to the use of such a filter in such processing and to processes for the separation of solid material from the washout liquid using such a filter unit.
Typically, such a centrifuge type filter unit includes a chamber mounted for rotation about an axis of symmetry. It is usually generally cylindrical and is rotatable about its longitudinal axis which may extend horizontally but more usually extends vertically.
A problem with existing centrifuges is that it is difficult to remove from them the solids which have been separated during the operation of the centrifuge. At the end of the operation of the centrifuge there is normally present a quantity of solid/liquid mixture within the centrifuge, and a layer of separated solid compressed against the inner peripheral wall of the chamber. Removal of the separated solid from the chamber is particularly difficult where it is desired not to mix such solid with the solid/liquid mixture within the chamber.
According to one aspect, the present invention provides the use of a centrifugal filter unit, ie. a filter unit of the rotary gravitational separator type, for the separation of a solid material from a waste washout liquid containing liquid washable photopolymer from a printing plate manufacturing process, which filter unit comprises
a centrifugal filter chamber rotatable so as to allow deposition of the solid material from the waste washout liquid, and
a collector removable from but retainable within the chamber for collection of the deposited solid material, and
means for releasably retaining the collector within the chamber,
which collector comprises a bag having a plurality of projections extending inwardly of the bag, such as flaps, corrugations or pleats. Thus the bag may be folded so as to gather pleats sewn in position at top and bottom end regions of the bag, which pleats are open between their top and bottom ends.
According to another aspect, the invention provides a centrifugal filter unit for separation of solid material from a waste washout liquid containing liquid washable photopolymer from a printing plate manufacturing process, which filter unit comprises a centrifugal filter chamber rotatable so as to allow deposition of the solid material from the waste washout liquid,
a collector removable from but retainable within the chamber for collection of the deposited solid material, and
means for releasably retaining the collector within the chamber,
which collector comprises a bag having a plurality of projections extending inwardly of the bag, as described above.
According to a further aspect, the invention provides a centrifugal filter unit for separation of solid material from a waste washout liquid containing liquid washable photopolymer from a printing plate manufacturing process, which filter unit comprises,
a preheater unit capable of coagulating photopolymeric waste washout liquid,
a centrifugal filter chamber rotatable so as to allow deposition of the solid material from the waste washout liquid,
a collector removable from but retainable within the chamber for collection of the deposited solid material, and
means for releasably retaining the collector within the chamber.
The filter unit may optionally additionally comprise an openable lid of the chamber, at least one of the chamber and lid carrying the means for releasably retaining within the chamber (at least when the lid is closed) the removable collector. The collector retaining means may comprise at least one collector retaining clip attached to one of the chamber and the lid. The clip may be a circlip or a plurality of clips around the top of the chamber. Preferably the mouth of the chamber is profiled to provide a recess co-opera
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Clegg Brian
Danon Richard
Dantex Graphics Limited
Dawson Robert A.
Popovics Robert James
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