Coating apparatus – Solid applicator contacting work – Pads or absorbent or porous applicators
Reexamination Certificate
1999-03-26
2001-09-25
Sells, James (Department: 1734)
Coating apparatus
Solid applicator contacting work
Pads or absorbent or porous applicators
C401S023000, C401S202000, C401S205000
Reexamination Certificate
active
06294021
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a system comprising a quick-drying, preferably aqueous, coating composition, the system consisting of a plastic container having a pressure release valve and containing the aqueous coating composition, a sponge for applying the aqueous coating composition, and a lid for airtight sealing of the sponge.
2. Prior art
Quick-drying coating compositions are known. Such coating compositions, which are preferably aqueous, are employed in particular in the first-time coating and in the care of wooden components, the coating compositions used as wood varnishes preferably comprising air-drying alkyd resins as binders.
In accordance with the processes of the prior art such wood varnishes are applied, for example, by brush or roller coating or by spray gun. These application techniques are disadvantageous in that in the case of brush or roller coating, especially of wooden frames or wooden profiles (for example window frames or treads), the substrate requires laborious preparation, that it is necessary to mask off the areas which are not to be varnished, that the wood varnishes tend toward dripping during application, that the wood varnishes form a skin in the storage vessels as a result of air contact on the liquid surface, and that the cleaning [sic] tools have to be cleaned with organic solvents, in an environmentally detrimental manner.
When using spray guns, the surfaces which are not to be varnished must likewise be masked off. In addition, following the application of the wood varnish, the spray nozzles of the spray guns require thorough cleaning in order to avoid them becoming blocked by dried-on varnish residues.
In all of the processes mentioned there are losses of coating composition as a result, for example, of dripping, paint splashes, overspray in the case of spray guns, or cleaning of the application tools.
SUMMARY OF THE INVENTION
The prior art threw up the problem of providing a system for the application of quick-drying coating compositions, especially wood varnishes, in which ease of handling, the avoidance of dripping in the course of varnish application, the avoidance of skinning in the storage vessel, and the avoidance of the drying-on of the varnish on the brush, on the roller or on the nozzle of the spray gun, are ensured.
The intention was at the same time to ensure uniform film application even in the case of relatively large areas, the avoidance of the impoverishment of the quick-drying aqueous coating composition at the application surface, the minimization of the application-related losses of coating composition, and the avoidance of the need to mask off areas which are not to be varnished.
Surprisingly, the novel system described below meets these requirements.
It consists essentially of a single-use or refillable plastic container having a pressure release valve and containing the quick-drying coating composition, of a sponge, which embeds the pressure release valve and is preferably in contact with it, by means of which sponge the quick-drying aqueous coating composition is distributed on the substrate that is to be coated, and of a lid, which provides an airtight seal to the sponge when the latter is not being used. In the course of application of the quick-drying coating composition, the sponge is pressed onto the surface that is to be coated and thereby actuates the pressure release valve, which dispenses the coating composition into the sponge. Here, the coating composition penetrates the cavities of the sponge, which are connected in a capillarylike manner, in such a way that there is always approximately the same amount of coating composition available at the surface of the sponge with which the coating composition is applied.
Since the sponge itself represents a comparatively large reservoir for the coating composition, which reservoir is continuous supplied with fresh coating composition by way of the pressure release valve, the coating composition can be applied in a uniform film thickness to relatively large substrate areas without dripping.
Reducing the pressure on the sponge and thus on the pressure release valve interrupts the supply of fresh coating composition to the sponge. This simple and economic metering facility creates a temporal window for optimum distribution of the coating composition on the substrate.
Furthermore, the drying of the coating composition on the pressure release valve and in the sponge is prevented by the continuous resupply of fresh coating composition by way of the pressure release valve, which is controlled by means of the pressure on the sponge, and by simultaneous continuous consumption of coating composition at the sponge surface.
It is no longer necessary to mask off the substrate surface that is to be coated [sic] since the sponge allows precise, locally restricted application of the coating composition.
REFERENCES:
patent: 4652163 (1987-03-01), Karliner et al.
patent: 4818134 (1989-04-01), Tsai
patent: 4983061 (1991-01-01), Demarest
patent: 5316403 (1994-05-01), Mansour
patent: 5480680 (1996-01-01), Vieyra
patent: 5881876 (1999-03-01), Nonomura et al.
patent: 5897262 (1999-04-01), Bratby-Carey
patent: 5927880 (1999-07-01), Allison et al.
patent: 35 31 661 C1 (1985-09-01), None
HomeRight Stain Stick applicator, web page from shop.cornerhardware.com, visited Jan. 26, 2001.
HomeRight Stain stick applicator, enlarged image from shop.cornerhardware.com, visited Jan. 26, 2001.
Lenz Jörg
Platzcke Martin
BASF Coatings AG
Sells James
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