Adhesive bonding and miscellaneous chemical manufacture – Differential fluid etching apparatus – With microwave gas energizing means
Patent
1988-08-19
1990-02-27
Dawson, Robert A.
Adhesive bonding and miscellaneous chemical manufacture
Differential fluid etching apparatus
With microwave gas energizing means
118684, 156155, 156305, 156584, 2224021, 239 98, 239 99, B32B 3118
Patent
active
049043293
DESCRIPTION:
BRIEF SUMMARY
The invention pertains to a process for stripping off an adhered-on coating with a closed surface using a stripping fluid. It also pertains to a device for carrying out the process.
Adhered-on coatings with closed surfaces, such as wall, ceiling or floor coverings, especially when heavy, can be removed only with difficulty. The group of such coatings includes carpet-like wall coverings made of PVC foam plastic; PVC films with fabric backings; hessian cloth, jute and glass fiber fabric coated with silicate paints or dispersion paints or lacquers; rough fibers with several coats of dispersion paint covering; carpets protected with elephant skin, and foamed polystyrene cover plates. Such coatings can be removed by using steam jet devices; by planing off, with the aid of a putty knife, pushing away centimeter by centimeter; or by pretreating the coating with a nail roller and/or wetting with a carpet remover. In addition, exposed adhesive residues can be softened and pushed off by spreading with a dissolving agent.
It is also especially difficult to loosen adhered-on carpetings. New floors are removed by wetting and pulling out, by cutting into strips and pulling out the individual strips, or by superficial cutting or filing off and grinding away the residue. All of the loosening methods used in previous practice are very expensive in terms of work and time, and are linked with considerable soiling.
The invention is based on the task of creating a process and device which would make it possible to soften or predissolve the binding agent between the covering and the substrate, designated in the present connection merely as "adhesive" for the sake of simplicity, even in the case of a heavy coating with a closed surface to such a degree that the coating can be removed by pulling off or scraping off using a putty knife. The solution in accordance with the invention for the process of the initially mentioned type consists of the fact that the stripping fluid is forced through the coating in a pulse-like way, air-free, with the aid of a needle nozzle.
The invention means that the adhesive located in the adhesive joint between the coating and the substrate, prior to mechanical removal of the coating, is to be softened, loosened, or chemically decomosed, since the pure, air-free stripping liquid, under a pressure adequate to penetrate the coating, e.g., under 100 to 400 bar, is pressed directly into the adhesive joint. Piston or membrane pumps operated without air can be used for conveying the high pressure stripping liquid. The establishment of the penetration depth of the stripping liquid is thus accomplished by changing the pressure at the nozzle inlet. The process is particularly effective in the case of a stripping fluid that has been made slightly viscous, improving the lifting off of the coating from the substrate (wedge effect). Conventional stripping fluids such as methylene chloride or glycol alcohol are suitable for use in the present invention, for example. Also, in one embodiment, such stripping fluids are obtained from the manufacturer in a high viscosity form for use in the present invention.
In accordance with a further invention, a device for carrying out the process of the initially mentioned type, in which the stripping liquid is pressed in an air-free, pulse-like manner with the aid of a needle nozzle through the coating, consists of the fact that the needle nozzle has a nozzle opening to be connected in a valve-like way to the stripping fluid inlet by pressing against the coating to be removed, and that a pressure pump, delivering without air, is connected to the stripping fluid inlet.
In order to ensure that the stripping fluid, possibly present at the nozzle opening at a high pressure, can also be pressed through a dense and heavy coating, the nozzle opening is formed on its surface, intended to face the coating, as a half-shell, concave with respect to the coating. As a seal for the hollow shell, a cutter ring, an O-ring especially made of rubber, or a flat seal is used.
One handy embodiment of
REFERENCES:
patent: 3698976 (1971-03-01), Ake et al.
patent: 3920185 (1975-11-01), Kwok
patent: 4466852 (1989-08-01), Beltz et al.
patent: 4798646 (1989-01-01), Sumi
Dittmar Herbert
Hein Josef T.
Dawson Robert A.
Engel, Jr. James
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Szoke Ernest G.
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