Fluid sprinkling – spraying – and diffusing – Processes – Including mixing or combining with air – gas or steam
Patent
1993-09-23
1995-11-21
Merritt, Karen B.
Fluid sprinkling, spraying, and diffusing
Processes
Including mixing or combining with air, gas or steam
2394275, 239428, 406120, E04F 2112
Patent
active
054679230
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/AT92/00137 filed 4 Nov. 1992 and based, in turn, upon Austrian application A 266/92 of 17 Feb. 1992 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a method of applying an insulating and/or fireproofing compound monolithically onto a surface and to a device for effecting said method.
BACKGROUND OF THE INVENTION
For some time now it has been known that asbestos is a health hazard and should therefore be avoided in the building and construction industry, particularly for enclosed interior spaces. On the other hand, asbestos-containing building materials are fire-resistant, which makes their multi-layered use in the form of solid structural elements and in the form of liquid materials for pouring or spraying understandable. In addition, asbestos is a poor conductor of heat and so provides a certain degree of heat insulation.
Following recognition of the health risks of asbestos, attempts were made to find substitute materials with, above all, equally good fire-resistant properties. Such materials with equally good fireproofing properties are, for example, vermiculite and perlite which are additionally kind to the skin and do not require special protection when handled and moreover offer a high degree of sound and heat insulation. Rock wool or the like, which likewise only requires minimal protective measures during processing, is also used for insulation purposes.
Despite strenuous efforts, it has until now proved impossible with the above-mentioned materials to produce an insulating and/or fireproofing compound which may be applied monolithically onto a smooth surface without a wash primer and without mechanical fastening means, e.g. as a spray plaster.
OBJECT OF THE INVENTION
The object of the invention is to provide a method and a device which allow an insulating and/or fireproofing compound to be applied monolithically onto a surface.
SUMMARY OF THE INVENTION
This object is achieved in that in a feed channel a pneumatic conveyor generates a moving air volume, into which are introduced an insulating and/or fireproofing material and a hardening agent which pass with the air volume into a spray pistol, which is connected to the feed channel and in which, just upstream of the nozzle-like exit, a gaseous pressure medium and a binding agent or an adhesive are introduced. The insulating and/or fireproofing compound thereby produced may be applied monolithically and durably onto a surface and preserves the properties specific to the insulating and/or fireproofing materials.
In particular, first the insulating and/or fireproofing material and then separately a hardening agent, preferably in powder form, are introduced into the air volume.
The method according to the invention is particularly suitable for insulating and/or fireproofing materials which have a lower specific weight than the binding agent, because the relatively light insulating and/or fireproofing material may be transported without difficulty in the air volume and the relatively heavy binding agent or the relatively heavy adhesive may be added later.
Suitable insulating and/or fireproofing materials are vermiculite, perlite or rock wool and the like.
An adhesive, in particular a fire protection adhesive, may be used as a binding agent.
At the start of the method, switching on of the pneumatic conveyor, the start of the supply of insulating and/or fireproofing material, of hardening agent and of binding agent or adhesive is preferably delayed by a control unit in each case in accordance with the specific weight and the feed distance. Delaying the supply of the individual components compensates the differences in the acceleration times owing to the differing specific weights and the differences in the distances of the feed points from the outlet nozzle of the spray pistol. After their acceleration phase, all of the components have the same velocity, namely that of the air volume, thereby achieving uniform transport of th
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Himmel Josef
Potuznik Walter
Burian Gesellschaft m.b.H. & Co. KG
Dubno Herbert
Merritt Karen B.
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