Apparatus and methods for application of coatings with compressible fluids as diluent by spraying from an orifice
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorKenneth A. Nielsen
Life of this patent
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Abstract
This invention is directed to an improved spray apparatus and corresponding methods for coating substrates with a coating material and a supercritical fluid or a subcritical compressed fluid, which apparatus is provided with an airless spray nozzle that produces a spray with reduced average velocity thereby minimizing the undesirable excessive momentum of the spray as well as the sideways deflection of the spray that occurs as it impacts of substrate. The spray nozzle is comprised of an elongated orifice passageway having a length sufficiently long in relation to the equivalent diameter so as to reduce the average spray velocity of the coating material.
Claims33
In a method for the airless spraying of a mixture of a non-compressible fluid and a compressible fluid which compressible fluid is a gas at standard conditions of 0.degree. C. and one atmosphere (STP) which comprises passing the mixture under pressure through a first orifice passageway to produce a decompressive spray having a first average spray velocity, the improvement which comprises providing an elongated first orifice passageway which is elongated in at least an amount such that when spraying the mixture of non-compressible and compressible fluids through the elongated first orifice passageway, a decompressive spray is produced having a second average spray velocity which is less than the first average spray velocity.
A method for reducing the average spray velocity of a decompressive airless spray stream comprised of a mixture of at least one non-compressible fluid and at least one compressible fluid which compressible fluid is a gas at standard conditions of 0.degree. C. and one atmosphere (STP) which stream is formed by passing the mixture under pressure through an orifice passageway comprising passing the mixture through an orifice passageway having a passageway length L and an equivalent diameter D wherein the ratio L:D is in the range of from about 2:1 to about 20:1.
In a method for the airless spraying of a mixture of a non-compressible fluid and a supercritical fluid which comprises passing the mixture under pressure through a first orifice passageway to produce a decompressive spray having a first average spray velocity, the improvement which comprises providing an elongated first orifice passageway which is elongated in at least an amount such that when spraying the mixture of non-compressible and supercritical fluids through the elongated first orifice passageway, a decompressive spray is produced having a second average spray velocity which is less than the first average spray velocity.
A method for reducing the average spray velocity of a decompressive airless spray stream comprised of a mixture of at least one non-compressible fluid and at least one supercritical fluid which stream is formed by passing the mixture under pressure through an orifice passageway comprising passing the mixture through an orifice passageway having a passageway length L and an equivalent diameter D wherein the ratio L:D is in the range of from about 2:1 to about 20:1.
Dependencies are inferred from the claim text.