Fluid sprinkling – spraying – and diffusing – With cleaning means – drip collecting – waste disposal or soil... – Waste disposal or drip collecting
Patent
1987-02-25
1988-03-01
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With cleaning means, drip collecting, waste disposal or soil...
Waste disposal or drip collecting
239222, 2392885, 239519, B05B 128, B05B 302, B05B 126
Patent
active
047280352
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the production of a spray of particles for application to a substrate. The substrate may be a moving web, for example, a web of pasty material constituting a precursor of paper or board in the manufacture of those materials.
A spray of particles may be generated in a number of ways. One apparatus for generating a spray of liquid particles is the rotary atomiser described in the specification of International Patent Application Publication No. WO84/04315. If it is desired to restrict the arc of the spray of liquid particles by placing shrouds about the means producing the spray, for example in the case of a rotary atomiser by surrounding part of the circumference of the atomiser with a shield so as to restrict the passage of liquid particles to the space beyond the shield, difficulties can arise in that use of a rigid shroud or shield at a distance from the means producing the spray of liquid particles is associated with the presence of liquid particles so fine that they can persist in the atmosphere for an inordinately long period of time and can pervade the space in which the spray producing means is located.
The present invention is based on the discovery that the incidence of such fine droplets can be reduced by using a shielding element comprising an array of bristles, a bristle being a yieldable hair or filament. The invention can, however, also be used in connection with the production of a spray of solid particles and the shrouding and restricting of such a spray.
Accordingly, an apparatus according to the invention for producing a spray of particles, comprises means for generating a spray of particles and shrouding means arranged about said spray producing means leaving a restricted arc or arcs over which particles can be ejected from the apparatus, the shrouding means including at least one shielding element comprising an array of bristles.
The length, thickness, stiffness and spacing of the bristles are chosen so as to achieve effective absorption by the array of bristles of the particles directed at the array, taking account of the size and velocity of the particles and the density of the particles.
Advantageously, the shrouding means is so arranged above a trough that fluent material intercepted by the shrouding means will flow down into the trough. It is also advantageous if the general direction of the bristles, in at least part of the array of bristles, forms an included angle of less than a right angle with the general direction of the particles impinging upon that part of the array. In this way the effect of the impact of the particles on the array is lessened and the tendency to secondary atomisation, in the case of liquid particles, is reduced.
The invention may be used in a method of applying a spray of particles to a substrate, the method comprising generating a spray of particles, arranging shrouding means to intercept some of the particles of the spray but leaving a restricted arc or arcs over which particles can be ejected to reach the substrate, the shrouding means including at least one shielding element comprising an array of bristles.
The means for producing the spray of particles may comprise a spinnable member and, in the case of liquid particles, the spinnable member may be part of a rotary atomiser.
One use for the apparatus and method according to the invention is in the application of a spray of liquid particles to the surface of a paper or board or to the surface of a web which is the precursor of paper or board.
Some properties of paper or board can be desirably influenced by applying materials to a surface of a web precursor of the paper or board. In some circumstances the materials are in liquid form and have to be applied to the web when it is in a semi-liquid state and can thus be easily damaged by impact from droplets issuing from a conventional spray nozzle. The rotary atomiser already mentioned, described in the specification of International Patent Application Publication No. WO84/04315 may then be used to apply droplets to the web precu
REFERENCES:
patent: 2748411 (1956-06-01), O'Brien
patent: 3014812 (1961-12-01), Sallie
patent: 3749315 (1973-07-01), Crathern
patent: 3829019 (1974-08-01), Petsch
patent: 4473188 (1984-09-01), Ballu
Cruse John W.
O'Callaghan William
Burkhart Patrick N.
Kashnikow Andres
P.T. Chemicals Limited
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