Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1988-06-20
1990-08-14
Nozick, Bernard
Gas separation
Means within gas stream for conducting concentrate to collector
55 90, 552576, 55465, 55270, B01D 4700
Patent
active
049483900
DESCRIPTION:
BRIEF SUMMARY
Compressed air is used extensively in industry to provide a variety of services associated with numerous activities such as propulsion, rotation, inflation and atomisation. In many instances it is desirable to control or modify a supply of compressed air in relation to such factors as temperature, humidity, flow rate and chemical composition. The present invention relates to the modification of compressed air by the generation of vapor phase chemical agents and has been found to have applications in such activities deodorization corrosion inhibition, fumigation and paint curing.
The preferred embodiment of the present invention has been found to be particularly useful in the treatment and rapid curing of substrate coatings such as paints. Consequently, the treatment and rapid curing of substrate coatings is emphasised herein but it will be clear from the examples that the present invention has numerous substrate coatings. Although the present invention has developed from paint curing technology, the present invention is not limited to use in the paint curing field.
Australian patent No. 476431 describes a pre-polymer coating vehicle, the drying of which can be greatly accelerated by treatment of the vehicle with a drying medium after application to a substrate. Australian patent application No. 80608/82 discloses a method of coating a substrate which comprises coating an aromatic hydroxyl-functional compound which further comprises substituted or unsubstituted 1,2-dihydroxybenzene or derivatives thereof in a multi-cyanate curing agent therefor which is, after coating onto the substrate exposed to a vaporous tertiary-amine catalyst to rapidly cure said applied film. Furthermore, Australian patent application No. 39524/85 discloses a polyurethane composition in which the drying rate is also accelerated by a catalyst. Other so-called catalyst curable painting systems are disclosed in Australian patent application Serial Nos. 88361/82, 87415/82 and 84684/82. Reference to Australian patent application No. 35870/84 will show that there are a very large number of vapor permeation curable coatings within the prior art which include, by way of example only, U.S. Pat. Nos. 2967117, 4267239, 4343839, 4365039, 4366193 and 4396647.
In view of the foregoing, it is apparent that a great deal of prior art exists in this field. It should be realized that not only is the present invention particularly adapted for use in conjunction with any one of the foregoing systems or a particular catalytic agent, it has uses outside the painting field.
The process of applying a drying agent, as disclosed in Australian patent No. 476,431, is to place the coated substrate in ,a drying chamber and then to introduce the vaporized drying agent. Numerous curing chambers have been proposed that would allow an atmosphere bearing an appropriate vapor phase curing agent to be introduced into and extracted from a curing chamber which also contains an article, the substrate of which has been coated with a curable paint. Examples of such curing chambers can be found in U.S. Pat. Nos. 3851402 and 3931684, as well as Australian patent application Nos. 35479/84 and 25783/84. The problem with the use of curing chambers is that the size of the articles that can be cost-effectively coated is restricted by the expense associated with the installation of a sufficiently large treatment chamber. For example, the installation of treatment booths of sufficient size to enclose a motor car is likely to represent a large capital cost to a smash repair business. Furthermore, as such a large booth would be lacking in mobility, a degree of flexibility would be lost from an existing operation by the installation of such a treatment booth. In operations where closed booths are used, extensive modification would be required so as to allow the drying agent to be introduced during the drying period and, also, to be extracted from the booth after treatment. Thus, even for an existing enclosed booth operation, expensive further modifications would, be required.
Alternative
REFERENCES:
patent: 3367402 (1968-02-01), Cross et al.
patent: 3613333 (1971-10-01), Gardenier
patent: 4149859 (1979-04-01), Vigesdal
patent: 4166799 (1979-09-01), Giacobbe
patent: 4359329 (1982-11-01), Willeitner
patent: 4469493 (1984-09-01), Tuovinen et al.
patent: 4479379 (1984-10-01), Tarcy
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