Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1998-01-12
2000-10-03
Codd, Bernard
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430119, 399241, 399246, 347 55, 347 68, 347 70, 347112, 427458, 427466, 427469, 427483, 118621, 118627, G03G 9125, G03G 1510, B41J 206, B05D 104
Patent
active
061270822
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus and method for the supply of liquid droplets and/or solids that are at least initially carried by liquid droplets, the droplets having an electrical charge. More particularly, the invention relates to the supply of liquids and/or solids into a gaseous environment.
The invention further relates to an apparatus and method for supplying liquid and/or solids to a substrate having upon or below its surface an electrical charge or potential, including cases where that electrical charge or potential is in the form of a spatial pattern within the surface area presented by the substrate to the droplets or solids.
In this specification we refer as `liquids` to the following: pure liquids, mixtures of pure liquids, solutions of solids and suspensions of particulate solids in any of the above. The term `liquid droplet` is similarly to be understood to include droplets of mixtures, solutions and suspensions as well as of pure liquids. In the case of solutions where we wish to refer specifically to the solvent rather than the solute, and in the case of suspensions where we wish to refer to the suspending liquid rather than the suspensate, we refer to the `carrier liquid`.
In this specification we also refer to liquid `conductivity`. By this we mean the ability to conduct an electrical current through the liquid from electrodes at differing electrical potentials immersed in the liquid. This includes the motion of charged solute or suspensate species (including solid particles) within the carrier liquid, which current would not occur in the absence of such species.
It is known to deposit liquids and/or solids materials on to substrates, the liquids and/or solids materials being carried to those substrates in the form of droplets of liquid (as herein defined) or of powdered solids. Applications include: the coating of moving sheets of substrate material, for example, to manufacture products such as adhesive tapes; the deposition of protective layers upon functional substrates otherwise vulnerable to their environment; and to confer specific properties or modify the properties of the substrate material, for example, coatings that control the release of a drug from a drug-containing matrix, the application of toner material in electrographic process, etc.
In some of these arts, for example in the electrographic and electrophotographic imaging arts, it is desired that the deposition of such airborne droplets (or powder solids in the case of evaporation of the carrier liquid before arrival at the substrate) on a substrate is responsive to a pattern of electrical charge or potential on or below the surface of that substrate. To enable this, it is generally required to provide the droplets with an electrical charge. For faithful deposition according to the pattern of electrical charge or potential of the substrate it is also generally required that the droplet inertia should not be too large (in relation to the electrostatic forces exerted on the droplets by the charge or potential pattern of the substrate), so that the motion of the charged droplets towards the substrate is responsive to the electrostatic forces between the substrate and the droplets and is not primarily governed by the momentum with which the droplets (or powder solids) enter the region proximate to the substrate. (This is also desirable, though less critical, in the case of deposition upon substrates whose charge or potential is uniform over the surface area of the substrate presented to the droplets.) In this way so called `imagewise development` known in the electrographic imaging and printing arts that renders visible a pre-written pattern of electrical charge by droplets containing opaque solids particles or dyes has been achieved. Particular examples are described in U.S. Pat. Nos. 3,005,726 (Olson); 2,690,394 (Carlson); 3,532,495 (Simm); 3,795,443 (Heine-Geldern). In other arts, it may not be an object that a visible mark is made by the pattern of solids remaining after evaporation of the carrier liquid.
Hitherto,
REFERENCES:
patent: 3606531 (1971-09-01), Gourdine
patent: 3795443 (1974-03-01), Heine-Geldern et al.
patent: 3967549 (1976-07-01), Thompson et al.
patent: 3977323 (1976-08-01), Pressman et al.
patent: 4023898 (1977-05-01), Ohno et al.
patent: 4126711 (1978-11-01), Marlow
patent: 4833505 (1989-05-01), Furuya et al.
patent: 5752142 (1998-05-01), Staples et al.
Blakey David Mark
Humberstone Victor Carey
Janse Van Rensburg Richard Wilhelm
Sant Andrew Jonathan
Taylor Peter John
Codd Bernard
TCC Group PLC
LandOfFree
Apparatus and method for supplying material to a substrate does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for supplying material to a substrate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for supplying material to a substrate will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-193447