LU84885A1 - METHOD FOR MANUFACTURING DECORATIVE COATINGS ON A SUPPORT, INSTALLATION THEREFOR AND PRODUCTS OBTAINED - Google Patents

Description

PROCESS FOR THE MANUFACTURE OF DECORATIVE COATINGS ON VN SJRPCR.T, INSTALLATION THEREFOR AND PRODUCT OBTAINED

„The present invention relates to a far-mstic-r process. ur, decorative coating on a “support and it extends to an installation” provided for iridescent implementing this process as well as the products produced.

19 The production of deposits is decorated on ur. any support, in particular on a rigid support which is the force to be executed. principle-

Cnvic-pQi'w Γ3.Γ Here Dctâr.ÎvlXc f Γ ü'4 S θ "t-Θ 2- 1 IΓ · CC Γ. V ό Γ. 11: r. - ne · rîrrc tv. ·" The realization in continuous that with many difficulties, in garcicul ir r if one plans to deposit several successive layers of vr. will elect this 15 decoration.

In various processes, such as the decoration on the racks: r .-: za ^ .y the realization of decorations on different ceramic dobbies, etc ... r. : it is usual to apply the different layers or strata of ceoeuati;.,. . ru: are usually of different colors) in separate stages with 20 interposition between the different stages of a treatment (generally therirdque) this drying, fixing or melting.

It can be seen that these processes are slow and often expensive in terms of energy and labor.

'The present invention aims to provide a method and an onsualiatour 25 which overcomes the aforementioned drawbacks.

The method and the installation of the invention can be applied to any support. J. By way of illustration, mention may be made of a metallic element in the case where it is desired to make decorations by the enamel technique, or else an element of generally flat shape in any ceramic dobby which one wishes to decorate. .

; The present invention therefore aims to provide a process for producing decorative coatings with an appearance mainly similar to ceramic and glazed coatings, without however being limited to these particular applications, by a process allowing rapid production, by continuous, which may include the successive application of various decorative layers or layers, without requiring drying or fixing after application of each of these layers.

5 The object of the present invention is achieved by a process characterized in that cu'on deposited on a support, according to a pattern or decoration, * at least one Doucre without having contact with the application iroven t powder and the support, at least one of the deposited powders being fixed by any suitable means. It should be clearly understood that the pQ process of the invention is of major interest in the case where several different types of powders (in particular powders of this particle size, of coloration, and of comprising: different; are applied successively, 11 absence of contact between the means of application of the powder and the ru: allowing successive controlled deposits without requiring this drying operation or this intermediate fixing.

The technique described applies as well to products and type "enamel" reacting thermally as to products trar.sforrn-ar. *. chemically (lime, cement, plaster, ...)

In fact, the powders deposited can be largely of any kind, namely mineral, organic and totally, partially or non-fusible at the subsequent working temperature.

The powders may be fusible or liable to be subjected to a chemical reaction. As an example of a powder which can react by Λ * chemical fixation, one can refer to a cement. The support used can be inert or reactional and, in particular in the case where the powder used is a cement, it is possible to envisage the deposition of the latter on any humidified support. In this case, the cement powder in contact with water 'may bind to the excess by chemical reaction.

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A particularly suitable support in this embodiment is asbestos or asbestos-cement, which can be decorated with: variously colored powders do not wax.

As a variant, it is: possible, after having deposited the had the “5 powders according to a decoration, this fixing the latter by an operation chir.rcue- er.

applying by any technique, in particular by spraying, a .second reactive on the surface, total or partial, of the ceccreated support. In case the applied powder is one. wax, you can spray or spray water that is ur. second reactive element, IQ It is also possible to envisage the deposition of a powder, crosslinked dobby, the local or total subsequent treatment consisting of a spraying of a crosslinking agent. These possibilities are given by way of example and do not feel imitative.

The envisaged technique simultaneously allows creation.

15 decoration by application of powder and the production of a certain relief depending on the quantity of the various powders applied and the fixing technique to which they will be subjected. Insofar as the fixing technique used is a fusion of powders, you will need to:.; R account for a modification effect and this reduction in relief, as well as: 20 edge effects (contraction or spreading according to the characteristics this powder.

The local superposition of several powders makes it possible to obtain relief and surface finish effects, but also specific effects in intensity, color, depth, shine, and / or iridescence. colours.

According to a first variant of the present invention, the means for applying the powders consists of a screen printing frame comprising these meshes distributed according to a desired decoration, through which the powders are distributed on the support.

According to a continuous process, this frame takes the form of a rotating cylinder, normally synchronized with the scrolling of the support, and supplied! r ·· r / Λ ί uniformly over the entire long r, powdered by an internal hopper with two lips? (scrapers) rub on the inside of the cylinder. The adjustment of the spacing of these lips allows this to vary the flow rate of powder as a function of the speed of rotation of the cylinder, the size and shape of the meshes, and the fluidity of the powder.

In addition, the particular decorative effects can be obtained by the technique of the invention, using powders of different properties. These different properties can be melting point, hot viscosity, wettability or other physical (diffusion and / or solubility) or chemical characteristics.

These particular decorative effects can advantageously be obtained by including in the powders materials creating heterogeneity in the coating, in particular crushed mineral materials, like a terracotta powder, products with a fairly coarse particle size (inlaid technique), etc ...

The technique of the invention is compatible with the techniques known for the preparation, production and finishing of various coatings used in the building, in particular for the production of decor. Thus, the decoration produced by the technique of the invention can be perfect with another decoration or complement another decoration, and the finished product can receive a transparent, colored or varnish; no, etc. The known techniques for producing reliefs by embossing or differential foam expansion can also be combined with the technique of the invention.

When the powder or powders have been applied to the support, the fixing may include a heat treatment causing the melting of all or part of the powder applied, while preserving the decoration. Heating by conventional techniques applied to ceramics or enamels can be used.

By a choice of powders used, it is possible to obtain particular matte effects.

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Thus, for example, a fusible powders can be smoothed during the melting and provide a state of this shiny surface while a weakly fusible powder can be applied to other er.ùrcits fear to create effects of contrast of brightness.

5 In a similar way, however, can integrate “- s = er.t confident cane la; powder in order to obtain a sparkling deposit and locally accentuated effects.

Some effects can be obtained by subjecting the support with its cep-'wS to an an rixat.ic-n tiieinMcpjc- to these controlled disturbances 10 of mechanical, pneumatic, electrical or other origin (vibrations.

scc.UflÇÇ - c-r c -— e ^ -rCwiiq "jû> cu elements rhctcser.fibles · 'visible light, IR or IT).

The present invention offers numerous possibilities and is certainly not limited to the examples described above or in the following description, but covers all variants coming within the scope of the invention.

The present invention will be described in more detail, by way of illustration, by an example of implementation, with reference to the following exercises and to the accompanying drawings in which: “Fig. 1 represents a schematic view of a installation of f ac-rO · ^ intended for Γ a continuous implementation of the process of 1 "inven-j. - · '- the flower 2 represents a view in partial section of a serious cylinder working without contact; - Figure 3 is a cross-sectional view of the cylinder of Figure 2 and, - Figure 4 is a schematic representation of a section in a decorated product obtained according to the method of the invention.

With reference to FIG. 1, a manufacturing installation intended for the continuous use of the process that the invention comprises, by way of example, a device for supplying the installation. Is he afraid to look like J? vs\ ____ ! v te 6 as well of a continuous band of a suc-port adéouat *, · γγ, ^ γ. „γ finished product as a conveyor belt supporting eler ^ n'-s in ^^ 'i-'ur -i to decorate, for example plates, j ·.: diciously egC3Cées e * - c''s "__.-- ~ c on the conveyor belt for eure provided with a decoration lcrs eu pa? oA, n 5 sous the powder application means 2. In the case where these T ^ are, at least partially, fusible, one can provide, after the powder application mvr 2, an oven for the treatment, Qnt then-v -, a ·> j 'w 1 * z> f a cooling zone 4 and a device for finishing and winding d ^ <5 products 5. - 10 According to the present invention, the means of application of sewing 2 comprises at least one cylinder of the type which is located ** '· a ”v fiqures 2 and 3. In the present exercise, it comprises four cylinders for applying powders, the number of cylinders being not limited.

The oven 3 intended for the heat treatment, in the example chosen 15 a fusion of powders, can be a conventional hot air, infrared or microwave oven or a combination of these different types.

The cooling zone can consist of a simple passage in the open air of the support coated with powders fixed in the oven. Cooling can be accelerated and improved by a stream of cooled air, heaters. 20 with water or any other suitable means.

As can be seen, the production chain described in this example of application comprises four successive powder application cylinders, without intermediate fixing. The orocécé is not however limited to this type of application and it is possible to provide for a larger number of 25 cylinders as well as different intermediate treatments. The fixing can in particular be carried out by techniques other than heat treatment.

In the given application, the four cylinders are driven by the same circumferential speed, this having the same value as the

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"* 7 / linear speed of travel of the support. One could also work at a circumferential speed of the cylinders different from the linear speed of travel of the support in order to obtain particular decorative effects.

0 Figures 2 and 3 show a cylinder for the application of powders, commonly called a frame. 11 is made up. serigraphic mesh screen, 10, supplied by a uniform distribution device, for example a screw 12 rotating in a supply line lo which distributes the powder uniformly in an internal hopper 1b 10 of the cylinder. The two longitudinal lips 15 and 16 of this hopper separated by a variable distance, to regulate the flow of powder which passes through the frame 10 as a function of the speed of rotation of the latter of the fluidity of the powder and of the mesh size in order to constitute localized deposits 17 on the support 20.

15 The adjustment of the spacing of the lips can be carried out by means of a screw 18.

According to an embodiment of the invention, a frame may include meshes of different shapes and sizes and / or densities depending on the desired pattern. In this way, the flow rate of the powder will be locally more or less important depending on the mesh and therefore differences in color intensity and / or the relief of the decoration can be obtained in this way.

The manufacturing facility described is intended for a continuous process. However, in the case of a batch process, a flat screen frame (frame) can be provided on which slides a hopper whose books (doctor blades) are spaced apart by an adjustable distance.

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Claims (21)

1. Method for manufacturing decorative coatings on a support, characterized in that at least one powder is deposited on a support, according to a pattern or decoration, without there being any contact between the moven j cation of the powder and the support, at least one of the deposited powders undergoing fixing by any suitable means. 2. Method according to claim 1, characterized in that several different powders, in particular powders of different particle size or color, are successively applied in controlled redundant deposits without drying or intermediate fixing operation. »3. Froceoe according to claim 3a 1 or 2, characterized in that the final fixing of the products is carried out thermally. 4. Method according to claim 1 or 2, characterized in that the final fixing is carried out chemically. 5. Method according to claim 4, characterized in that the powder capable of reacting by chemical fixation, is a cement transforming by chemical reaction in the presence of water. 6. Method according to any one of claims 1 to 5, characterized in that the support used is inert or reactive. 7. Method according to claim 6, characterized in that, in the case where the powder used is a cement, this is deposited "{on any humidified support. . 8. Method according to claim 7, characterized in that the support is an asbestos or asbestos-cement support which is decorated with variously colored cement powders. Ψ / 0 / / f ο 8 Claims 9. Method according to any one of claims 1 to 7 characterized in that * after depositing the powder (s) according to ur. decoration, this is fixed by a chemical operation by applying, in particular by spraying, one or more reagents to the total surface f 5 or partial of the decorated support. 10. A method according to any one of these claims 1 to 4, characterized in that a powder of a crosslinkable material is deposited, the local or total subsequent treatment consisting of a spraying of a crosslinking agent. 11. Method according to any one of these claims 1 to IC, „characterized by the creation of a decoration by application of powder and the realization of a certain relief depending on the quantity of the various precautions applied and the fixing technique they will be submitted. 12. A process according to any one of the preceding claims, characterized in that the means for applying the powders consists, in the case of a batch process, in a screen printing frame comprising meshes distributed according to a desired decoration, on which a powder hopper moves, the two lips of which with adjustable opening scrape the surface of said frame. 13. Method according to one of claims 1 to 11, characterized in that the means for applying the powders consists in the case. of a continuous process, in a screen printing cylinder (10) fed by a device for uniform distribution of the powder in a hopper 25 (14) inside the cylinder, the two longitudinal lips (15,16) of which are spaced adjustable distance and scrape the inner surface ”<· of the screen (10). JL »V T 10 14. A method according to any one of the preceding claims characterized in that included in the powders dobbies creating heterogeneity such as crushed or coarse mineral dobbies. 15. Method according to any one of the preceding claims, characterized in that the support with its deposits »before thermal fixing is subjected to controlled disturbances of mechanical, pneumatic electric or other origin. 16. Manufacturing installation for implementing the method according to any one of the preceding claims, comprising at least one supply device Q), a station (3) for the fixing treatment, an optional cooling zone. e (4) and a receiving device <'5 i, characterized in that it comprises a means for applying powders il) without contact with the £ 5 support (6). 17. Production installation according to claim 16, characterized in that the powder application means consists of at least one cylinder, the wall of which is constituted by a screen printing frame (10) supplied by a device for uniform distribution of the powder. in a hopper (14) inside the cylinder (10), the two longitudinal lips (15,16) of which are spaced apart by an adjustable distance and scrape the internal surface of the screen (10). 18. Production installation according to claim 17, * characterized in that the screen printing frame (10) is fed by means of a screw (12) rotating in a supply duct (13) which distributes the powder uniformly in the hopper (14 ;. 19. Production installation according to claim 17 or 18, characterized in that the powder application means consists of cylinders rotating at the same circumferential speed, the latter having the same value as the linear speed of travel of the support. 4 5_____ / 1} 20. Production installation according to claim 17 or 18, characterized in that the powder application means consists of cylinders rotating at a circumferential speed different from the running speed of the support. 21. Products obtained by the process of any one of claims 1 to 15. · / ^ "" i A *