Coating apparatus – Projection or spray type – Applying solid particulate material
Patent
1993-02-26
1996-04-16
Collins, Laura
Coating apparatus
Projection or spray type
Applying solid particulate material
118642, 118 58, 118503, 239403, 2394245, 239597, B05B 700
Patent
active
055078699
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is directed to a method and a device for applying an insulating layer to a surface of an object.
In connection with oven cavities used in ranges or built-in ovens the oven, cavity has to be provided with a heat cavity insulation surrounding said cavity which prevents the heat energy supplied to the oven from unnecessarily leaking out to the environment and, at the same time, assures that surrounding range or oven parts not reach high temperatures at which there is a risk of fire or other damage.
Traditionally, a heat insulation of the kind referred to has the shape of mats and plates of glass-wool or mineral wool cut out and secured to the outer surfaces of the oven cavity by means of steel straps or the like or, at the rear side of the oven, by means of an adhesive. The most common insulating material is glass-wool which consists of glass fibres kept together by a phenol-based binder. In manufacturing ranges or ovens in the factory these mats or plates of glass-fibre have to be cut out and otherwise handled in a way creating glass fibre dust in large quantities. This dust creation disadvantage is made worse by the use of tools driven by compressed air In addition, the manual handling itself of the glass-wool mats and plates involves the risk of skin irritations, such as eczema, to develop. Another drawback is the creation of noxious gases emitted from the phenol containing binder of the heat insulation when the finished range or oven is used.
Accordingly, it is an object of the invention to make possible the application of an insulation of the kind referred to in such a way as to remedy the drawbacks indicated.
SUMMARY OF THE INVENTION
sprayed on a surface to be insulated. As the fibres are sprayed by means of an airstream, the fibres are wetted by a separate spray of water with a binder material. The device for applying the fibres by spraying includes a source for the fibres, a spray assembly having a conduit with first and second ejector means at respective ends of the conduit, and spray nozzles adjacent to the outlet of the conduit for applying the mixture of water and binder to the sprayed fibres.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described more in detail in connection with an embodiment with reference to the enclosed drawings in which:
FIG. 1 schematically shows a production facility for application of an insulating layer according to the invention onto the outer surfaces of an oven cavity;
FIG. 2 schematically shows the oven cavity supported by the gripping tool of a handling robot in the production facility;
FIG. 3 schematically shows a device for applying an insulating layer, the device being part of the facility of FIG. 1;
FIG. 4a and 4b show an ejector, being part of the device of FIG. 2, for providing of a unidirectional air stream;
FIG. 5a and 5b show an ejector, being part of the device of FIG. 2, for creating a rotating movement of an air stream containing fibres;
FIG. 6 is a schematic view taken perpendicular to the outlet of a fibre applying nozzle, being part of the device of FIG. 2, showing a preferred arrangement of liquid spraying nozzles;
FIG. 7 shows a modified embodiment of the arrangement of FIG. 6;
FIG. 8 schematically shows, in a top view, the fibre applying and liquid spraying nozzles, respectively, described with reference to FIGS. 5 and 6; and
FIGS. 9a-9g schematically show the distribution of fibres applied onto an object at different modes of operation with different parameters set which influence the fibre stream.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The embodiment to be described refers to the application of a heat insulating layer to the outside of an oven cavity intended to be mounted in a domestic range. Alternatively, the oven cavity may constitute a separate unit in the shape of a built-in oven. Suitably, the application of the insulating layer is carried out in an automatic work station of a suitable design. In FIG. 1 the design of such work station is schematically show
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Nyberg Curt E. T.
Troberg Henrik E.
Aktiebolaget Electrolux
Collins Laura
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