GB2553209A

GB2553209A - Device and method for colouring a hand-moulded brick

Info

Publication number: GB2553209A
Application number: GB1710507.3A
Authority: GB
Inventors: Asselberghs Francois
Original assignee: Wienerberger NV
Current assignee: Wienerberger NV
Priority date: 2016-07-01
Filing date: 2017-06-30
Publication date: 2018-02-28
Anticipated expiration: 2037-06-30
Also published as: GB2553209B; BE1024415B1; BE1024415A1; GB201710507D0

Abstract

A device for colouring a hand-moulded brick comprises a projection device 1 for projecting colourant onto one or more side walls of a cavity of a brick moulding tray 2 for moulding the brick. The colourant can be projected onto the side walls by a distribution elements (3, Figure 4) which can be located in the moulding cavity. Colourant, may be stored in a reservoir from which it may be metered into a metering pot from where it may be blown towards blowing openings (10, Figure 5) of holding a element (9) via lines between an applicator and blowing openings (10). The colourant may be powder and the walls of the tray may be wetted to allow the colorant to adhere to the walls then transfer to the clay during moulding. A tilting arrangement allows distribution element (3) to be tilted during colourant application to enable application of colourant to the entire surface area of the side faces of the moulding tray cavity.

Description

(54) Title of the Invention: Device and method for colouring a hand-moulded brick Abstract Title: Device and method for colouring a hand-moulded brick (57) A device for colouring a hand-moulded brick comprises a projection device 1 for projecting colourant onto one or more side walls of a cavity of a brick moulding tray 2 for moulding the brick. The colourant can be projected onto the side walls by a distribution elements (3, Figure 4) which can be located in the moulding cavity. Colourant, may be stored in a reservoir from which it may be metered into a metering pot from where it may be blown towards blowing openings (10, Figure 5) of holding a element (9) via lines between an applicator and blowing openings (10). The colourant may be powder and the walls of the tray may be wetted to allow the colorant to adhere to the walls then transfer to the clay during moulding. A tilting arrangement allows distribution element (3) to be tilted during colourant application to enable application of colourant to the entire surface area of the side faces of the moulding tray cavity.

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DEVICE AND METHOD FOR COLOURING A HAND-MOULDED BRICK

The present invention relates to a device for colouring a hand-moulded brick. The present invention also relates to a method for colouring a hand-moulded brick comprising providing a moulding tray, applying colour-imparting elements in the mould cavity of the moulding tray and placing clay or the like into the mould cavity for moulding the hand-moulded brick.

Typically, hand-moulded bricks are made by placing a lump of clay into a mould (moulding tray), subsequently drying the moulded clay and subsequently firing the dried clay. Nowadays, this is usually done by machine, with several hand-moulded bricks being moulded simultaneously in a moulding tray section which comprises several moulding trays.

Typically, the appearance of the bricks moulded in this way is determined by the mixture of the clay to which colourants may be added, possibly together with sand which is scattered in the mould.

GB 1 308 306 describes how, in order to colour a brick, particles can be scattered on the bottom of the mould, with the mould then being filled with cementitious material in order to form said brick.

EP 1 827 784 BI describes how colourants can be applied to concrete bricks before the concrete is compacted and cured.

In order to give hand-moulded bricks a different appearance, after moulding the handmoulded bricks in a moulding tray which has not been lined with sand, they are already sprayed with paint in a liquid state. However, this means that it is not possible to create nuances such as those on sand-struck hand-moulded bricks. Hand-moulded bricks which have been given the same colour in this way are often undesired, since handmoulded bricks are specifically selected owing to their rustic appearance and the fact that the moulding process means that no two bricks look alike.

The demand for more colour nuances and different coloured bricks is also increasing with respect to sand-struck hand-moulded bricks.

The object of the present invention is to provide a device and a method for colouring hand-moulded bricks by means of which it is possible to obtain hand-moulded bricks (both sand-struck and not sand-struck) with more colour nuances and different colours.

This object is achieved by providing a device for colouring a hand-moulded brick, wherein said device comprises projection means for projecting colourant onto one or more side walls of a moulding tray for moulding the hand-moulded brick therein.

It is possible that the sides of a hand-moulded brick, which are formed in the moulding tray by the side walls of the moulding tray, will be visible during use after the handmoulded brick has been placed in, for example, a wall, a patio or the like. By projecting a colourant in this case onto one or more side walls of the moulding tray, a handmoulded brick moulded in said moulding tray will have one or more visible sides of a certain colour. By working with such a device, it is possible to provide more colour nuances and/or a greater variety of colours is possible, as a result of which handmoulded bricks with a very rustic appearance can be produced. The appearance of these hand-moulded bricks may even correspond to the appearance of bricks which were made by hand. This is due, for example, to providing the different side walls of the moulding tray with different colours and/or applying the colourant to the one or more side walls in a non-uniform way and/or applying the colourant to the different side walls in different nuances. A moulding tray usually comprises 4 side walls. In this case, it is then possible to select which side walls to project with colourant, with which nuances and using which colourant. It is possible to apply one type of colourant, however it is also possible to apply different colourants simultaneously and/or successively. The colourant used may be in various forms. It may thus, for example, be in a liquid state or, for example, in powder form. Preferably, the colourant is in powder form so that this colourant continues to adhere well in the moulding tray. During application of the colourant in the moulding tray by the device according to the invention, the moulding tray may be wet/moist. A powder will continue to adhere well to a wet surface and can thus readily be transferred to the hand-moulded brick which is moulded in the moulding tray.

In addition, it is also possible to scatter sand in the moulding tray. This can be done before, during or after the projection of the colourant into the mould cavity. The scattering of sand can be carried out by this device. However, it is also possible to provide an additional device by means of which a moulding tray can be scattered with sand.

Preferably, said projection means comprise at least one distribution element, which is fittable in the mould cavity of the moulding tray and comprises application means for applying colourant to the distribution element, in order to project the colourant onto one or more side walls of the moulding tray via the distribution element. With the aid of a distribution element, the colourant is projected onto the (side) walls of the moulding tray via rebound and/or by further movement of the distribution element. For this purpose, the distribution element will be fitted at least partially, preferably even fully, in the mould cavity. This allows the colourant to be readily applied to the distribution element via the access opening of the mould cavity. If the distribution element extends fully in the mould cavity, the risk of colourant ending up next to the mould cavity is low. During the projection of the colourant into the moulding tray, the colourant is projected onto one or more (side) walls and possibly additionally onto other (side) walls. Preferably, the colourant is only projected onto the side walls. It is also possible to change the direction of the distribution element so that the colourant is also projected onto other (side) walls. The distribution element may be of all kinds of shapes.

The device may be configured to project the colourant directly onto a side wall without the presence of a distribution element. However, this makes it more difficult to apply nuances onto the side wall.

The distribution element is preferably configured in the form of a plate and is configured to extend substantially at an angle with respect to the side walls after it has been fitted in the mould cavity. More specifically, said distribution element may in this case extend virtually at right angles to the side walls. Different forms of plate are possible, such as, inter alia, circular, rectangular, triangular and oval. The distribution element may also comprise a plurality of plate-shaped elements which optionally extend next to one another. If the distribution element comprises a plurality of plate4 shaped elements, these plate-shaped elements may be configured to extend at different angles so that the side walls can readily be provided with nuances. Since the plateshaped distribution element extends at an angle with respect to the side walls, colour nuances are obtained on the side walls of the moulding tray by projecting the colourant, as a result of which a hand-moulded brick moulded in this moulding tray will also have nuances. Said angle may also be changeable during the projection of the colourant, for example by tilting or rotating the distribution element.

Furthermore preferably, the projection means comprises blowing means for projecting the colourant. This is a simple way to project colourant onto a said side wall. The blowing means may comprise, for example, compressed air. It is possible to provide a plurality of blowing means so that a plurality of colourants are applicable simultaneously and/or successively.

The blowing means preferably forms part of the application means for applying the colourant to the distribution element. In this case, it is then possible to apply the colourant to the distribution element, for example, under compressed air, after which the colourant is transferred onto the side walls via the distribution element.

In addition, or alternatively, the projection means comprises driving means in order to rotate the distribution element about an axis which extends virtually parallel to the side walls, in order to propel colourant applied thereto against the side walls of the moulding tray. By propelling the colourant against the side walls, the side walls acquire certain colour nuances which can then be transferred to the hand-moulded brick which is produced in the moulding tray.

Preferably, the projection means comprise tilting means for tilting the distribution element about an axis which is at an angle with respect to at least one of the side walls. With the aid of this tilting movement, it is readily possible to accommodate tolerances of the automatic placement of the distribution element with respect to the moulding tray, so that the distribution element is always in an optimum position. By tilting the distribution element, it is possible to apply the colourant to different areas in the moulding tray and the rebound of the colourant in the moulding tray also changes so that the side walls acquire colour nuances. It is thus possible to obtain very aesthetically appealing hand-moulded bricks. Preferably, said axis is transverse to one of the side walls which is configured to mould the stretcher side of a hand-moulded brick.

Also furthermore preferably, the projection means comprises metering means for applying a certain quantity of colourant to the distribution element. With the aid of the metering means, it is possible in this case to control in an optimum way how much colourant is applied to the distribution element and thus how much colourant will be projected onto the side walls.

Each distribution element is preferably fastened to and at a distance from a holding element with the aid of a corresponding spacer, wherein, after the distribution element has been fitted in the mould cavity via an access opening to said mould cavity, the holding element is configured to at least partially cover said access opening to said mould cavity. In this way, the colourant which is applied in the moulding tray by the distribution element is prevented from being able to leave said moulding tray. This leads to less loss of colourant and the area surrounding the moulding tray also does not become contaminated or less quickly becomes contaminated with colourant.

Each distribution element may, for example, be provided on the corresponding spacer in a replaceable, detachable and fastenable manner, so that, by replacing the one or more distribution elements, the same device may be adapted flexibly to changing needs.

Furthermore preferably, the holding element is provided with one or more blowing openings for projecting the colourant therethrough with the aid of the blowing means. With the aid of this holding element, it is readily possible to apply colourants in the moulding trays. This also ensures a smooth supply of colourant. If two or more blowing openings are present, it is possible to choose which colourant to apply through which blowing opening.

Preferably, the device is provided for projecting colourant onto side walls of a plurality of moulding trays which form part of the same moulding tray section. In order to allow the automatic production of hand-moulded bricks to proceed efficiently, use is generally made for this purpose of moulding tray sections having a plurality of moulding trays. In this case, the device can provide the side walls of the moulding trays of one moulding tray section with colourant simultaneously, as a result of which a fast, automatic process for producing hand-moulded bricks is possible with the aid of this device.

Furthermore preferably, the device comprises at least one said distribution element per moulding tray, wherein each distribution element is fastened to and at a distance from the same holding element with the aid of a corresponding spacer, wherein, after the distribution elements have been fitted in the corresponding mould cavities via a corresponding access opening to each mould cavity, the holding element is configured to at least partially cover said access openings to the mould cavities. In this case, there is then at least one distribution element per moulding tray so that one or more side walls of all moulding trays can be provided with colourant. Since these distribution elements are all attached to the same holding element, the device is of limited complexity. Moreover, it is possible to provide a tiltable holding element so that all distribution elements are then tiltable simultaneously. It is also possible in this case to blow colourant through blowing openings using the same blowing means in order to thus project colourant into different moulding trays.

These blowing openings can be connected to blowing lines which are connected to one or more metering pots in order to thus control the amount of colourant which is blown through the blowing openings with the aid of the blowing means. In that case, these metering pots are, for example, connected directly or indirectly to reservoirs containing colourant.

It is possible to provide different reservoirs optionally containing different colourants which are each connected to one or more corresponding metering pots, with each metering pot being connected to one or more blowing openings and with these metering pots being connected to the blowing means. In order to be able to apply a plurality of colourants in one moulding tray, it is possible to provide a plurality of distribution elements and/or a plurality of blowing openings. In other words, with the aid of this device it is possible to produce hand-moulded bricks having all kinds of colour variations and colour nuances.

The above-mentioned object is also achieved by providing a method for colouring a hand-moulded brick comprising providing a moulding tray, applying colour-imparting elements in the mould cavity of the moulding tray and placing clay or the like into the mould cavity for moulding the hand-moulded brick, wherein colourant is projected onto one or more side walls of the moulding tray in order to apply colour-imparting elements in the mould cavity. By projecting colourant onto one or more side walls, the clay which comes into contact with these side walls will be coloured. The clay which comes into contact with the side walls and forms the outer surfaces of the handmoulded brick often forms the visible sides of the hand-moulded brick, as a result of which the hand-moulded brick moulded by means of this method comprises one or more specifically coloured visible sides, in other words coloured outer surfaces.

The colourants which are applied in the mould cavity and the way in which they are projected onto the side faces will determine which colour nuances and/or colours these visible sides will have. These possible nuances and colours mean that such a handmoulded brick can acquire a very rustic appearance corresponding to bricks which are made by hand. This is accomplished, for example, by providing the different side walls with different colours and/or by applying the colourant to the one or more side walls in a non-uniform manner. A moulding tray usually comprises 4 side walls. In this case, it is then possible to choose the side walls onto which to project colourant, the nuances which are created and the colourants which will be used. It is possible to use one type of colourant, however it is also possible to apply a number of colourants. It is possible to choose, for example, a liquid colourant or a colourant in powder form. Preferably, the colourant is in powder form so that said colourant continues to adhere well in the moulding tray. During application of the colourant in the moulding tray, the moulding tray is normally wet. A powder will continue to adhere well to a wet surface.

Before or after projecting colourant into the moulding tray, it is additionally also possible to scatter sand into the moulding tray. Such sand may possibly also be projected into the mould cavity together with the colourant.

Preferably, at least one distribution element is fitted in the mould cavity and the colourant is applied to said distribution element, in order to be projected onto the one or more side walls via said distribution element. By fitting the distribution element at least partially in the mould cavity, it is readily possible to project colourant onto the side walls. This projection onto the side walls takes place directly and/or via rebound of the colourant onto the (side) walls of the moulding tray. The distribution element may be arranged in such a way that its direction is also changeable, as a result of which the colourant is readily and effectively projectable onto the side walls. The distribution element may be of all kinds of shapes.

Furthermore preferably, the colourant is projected onto the distribution element in order to apply said colourant to the distribution element. Also furthermore preferably, the distribution element is tilted during projection of colourant onto said distribution element. By allowing the distribution element to tilt when colourant is projected onto said distribution element, this ensures more effectively that said colourant, which is then further projected onto the one or more side walls by the distribution element, is well distributed over the entire one or more side walls or certainly the part of these one or more side walls onto which the application of colourant is desired. This also accommodates possible tolerances in relation to the mutual positioning of the distribution element and the moulding tray.

Preferably, a moulding tray section is provided with a plurality of moulding trays, of which said moulding tray is part. By working with a moulding tray section having a plurality of moulding trays, it is possible to simultaneously produce a plurality of handmoulded bricks in a faster manner. Preferably, in this case colourant is then applied to one or more side walls of all moulding trays.

The moulding tray section may be configured in two parts, with a wall part which comprises the side walls of the moulding trays of the moulding tray section and a bottom part which comprises the bottoms of the moulding trays and wherein the wall part is separated from the bottom part in order to project the colourant onto the one or more side walls. For this purpose, it is possible to choose only to apply colourant to the moulding trays when the wall part and the bottom part have been separated from one another.

The one or more side walls are preferably moistened before the colourant is projected onto said one or more side walls. This will allow the colourant to sufficiently stick/adhere to the side walls and yet be effectively transferred to the clay.

The colourant is, for example, projected onto the one or more side walls in powder form.

Preferably, the colourant is projected with the aid of compressed air. Compressed air is a readily and commonly available means which can be used to project colourant.

Further preferably, the colourant is projected onto the side walls of the moulding tray with the aid of a device as described above.

The present invention will now be described in more detail by means of the following detailed description of a preferred device and a preferred method for colouring a handmoulded brick according to the present invention. The sole aim of this description is to provide illustrative examples and to indicate further advantages and particulars of the present invention, and may therefore not be interpreted as a limitation of the area of application of the invention or of the patent rights defined in the claims.

In this detailed description, reference numerals are used to refer to the attached drawings, in which

- Figure 1 is a perspective view of a device according to the invention and a wall part of a moulding tray section comprising a plurality of moulding trays;

- Figure 2 is a top view of the device and the wall part illustrated in Figure i;

- Figure 3 is a side view of the device and the wall part illustrated in Figures 1 and 2;

Figure 4 shows a detail view from Figure 3;

- Figure 5 is a front view of a part of the projection means of the device as illustrated in Figures 1 to 3,

- Figure 6 is a cross section of a part of the projection means of the device as illustrated in Figures 1 to 3,

- Figure 7 is a rear view of a part of the projection means of the device as illustrated in Figures 1 to 3,

- Figure 8 is a side view of a part of the projection means of the device as illustrated in Figures 1 to 3,

- Figure 9 is another side view of a part of the projection means of the device as illustrated in Figures 1 to 3.

The device as illustrated in Figures 1 to 3 comprises projection means (1) for projecting colourant onto one or more side walls of the moulding trays (2) of a moulding tray section. A moulding tray section comprises various moulding trays (2) into which, after application of said colourant, clay is placeable in order to mould hand-moulded bricks.

Here, the moulding tray section is configured in two parts, with a wall part (11) which comprises the side walls of the moulding trays (2) of the moulding tray section and a bottom part which comprises the bottoms of the moulding trays (2) and with the wall part (11) being separated from the bottom part in order to project the colourant onto the one or more side walls. Therefore, only the wall part (11) is visible in Figures 1 to

3.

The projections means (1) comprise the following parts:

distribution elements (3), which are fittable in the mould cavities of the moulding trays (2) in order to thus be able to project colourant onto one or more of said side walls of the moulding trays (2), application means (5) for applying colourant to the distribution elements (3),

- tilting means (6) for tilting the distribution elements (3) about an axis which is at an angle with respect to at least one of the side walls. In this case, the axis is at an angle of virtually 90° with respect to the side walls which are provided in order to mould the stretcher edges of the hand-moulded bricks, spacers (8), a holding element (9).

The application means (5) comprise the following parts:

- blowing means (4) which are provided in order to apply colourant to the distribution elements (3) with the aid of compressed air,

- funnels (15) into which colourant from reservoirs (14) is placeable. These reservoirs (14) form part of the device and serve to temporarily store colourant;

- metering means in the reservoirs (14) in order to project the desired quantity of colourant onto the distribution elements (3).

The distribution elements (3) are configured in the form of a plate. In Figure 5, it is clear that the distribution elements (3) may have a rectangular shape or a circular shape. Of course, the invention is not limited to these shapes.

Each distribution element (3) is fastened to and at a distance from the holding element (9) with the aid of a said corresponding spacer (8). The holding element (9) is provided with a plurality of blowing openings (10) for projecting the colourant therethrough with the aid of the blowing means (4). Via the blowing openings (10), the colourant is then projected onto the distribution elements (3). For each moulding tray (2), the illustrated device comprises three said blowing openings (10) and one or more distribution elements (3).

Since the projection of colourant into the mould cavities under compressed air leads to excess pressure, suction means (7) are provided in order to compensate for this excess pressure. With the aid of these suction means (7), excess colourant is also extracted.

After the distribution elements have been fitted in the corresponding mould cavities via a corresponding access opening to each mould cavity, the holding element (9) is configured to at least partially cover said access openings to the mould cavities.

After the distribution elements (3) have been fitted in the mould cavities, the distribution elements (3) extend virtually at right angles to the side walls.

With the aid of this device, it is possible to perform a method for moulding coloured hand-moulded bricks.

This method proceeds as follows:

First, the moulding tray section which is constructed in two parts is provided with a number of moulding trays (2). Then, the wall part (11) of the moulding tray section will be positioned with respect to the device so that the distribution elements (3) are fittable in the mould cavities of the moulding trays (2).

The distribution elements (3) are inserted into the mould cavities, following which colourant is projected onto the distribution elements (3) via the blowing openings (10), so that colourant is projected onto one or more of the side walls of said moulding trays (2) via the distribution elements (3).

The colourant can be projected onto the side walls by the distribution elements (3) owing to the fact that colourant is projected onto these distribution elements (3). This occurs in the following way. The colourant, which is temporarily stored in the reservoirs (14), is blown onto the distribution elements (3) with the aid of the application means (5). For this purpose, the application means (5) comprise a funnel (15) per reservoir (14), into which funnel (15) the colourant from a said reservoir (14) is placed. To this end, each reservoir (14) comprises metering means in order to allow a certain quantity of colourant to drop into the funnel (15). In the application means (5), a choke valve (12) is arranged under the funnel (15), under which choke valve (12) is a metering pot (13). The colourant which comes to rest in the metering pot (13) is blown towards the blowing openings (10) of the holding element (9) via the blowing means (4) through lines which are not illustrated. These lines are connected on the one hand to the connections (15) of the application means (5) and on the other hand to the blowing openings (10). It is possible to further control the distribution of the colourant between the different lines and thus between different moulding trays (2) by means of the shape and length of these lines and/or by fitting, for example, a control valve on one or more lines. With the aid of the choke valve (12), the access to the metering pot (13) is closed before the blowing means (4) are placed into operation, so that the colourant can now only leave the metering pot (13) via the lines. The blowing means (4) use compressed air.

Prior to applying the colourant to the side faces, these side faces are first wetted in such a way that the colourant continues to adhere well to the side faces. The colourant used is colourant in powder form. This colourant will adhere sufficiently to the wet surfaces and yet be transferred sufficiently smoothly to the clay which, after colouring of the side faces, is placed into the mould cavities in order to mould the hand-moulded bricks.

During application of the colourant onto the side faces of the moulding trays (2), the distribution elements (3) are tilted in order to be able to colour the entire surface area of the side faces. This is possible due to the fact that the holding element (9) is tiltable with the aid of the tilting means (6).

After applying the colourant to the side faces, clay is placed into the mould cavities in order to thus mould coloured hand-moulded bricks. Hand-moulded bricks moulded in this way are then demoulded, dried and fired.

Claims

1. A device for colouring a hand-moulded brick, characterized in that said device comprises projection means (1) for projecting colourant onto one or more side walls of a moulding tray (2) for moulding the hand-moulded brick therein.

2. The device according to claim 1, wherein said projection means (1) comprise at least one distribution element (3), which is fittable in the mould cavity of the moulding tray (2) and comprises application means (5) for applying colourant to the distribution element (3), in order to project the colourant onto one or more side walls of the moulding tray (2) via the distribution element (3).

3. The device according to claim 2, wherein the distribution element (3) is configured in the form of a plate and is configured to extend substantially at an angle with respect to the side walls after it has been fitted in the mould cavity.

4. The device according to claim 2 or claim 3, wherein the projection means (1) comprises blowing means (4) for projecting the colourant.

5. The device according to claim 4 when dependent on claim 2, wherein the blowing means (4) forms part of the application means (5) for applying the colourant to the distribution element (3).

6. The device according to any of claims 2 to 5, wherein the projection means (1) comprises driving means in order to rotate the distribution element (3) about an axis which extends virtually parallel to the side walls, in order to propel colourant applied thereto against the side walls of the moulding tray (2).

7. The device according to any of claims 2 to 6, wherein the projection means (1) comprises tilting means (6) for tilting the distribution element (3) about an axis which is at an angle with respect to at least one of the side walls.

8. The device according to any of claims 2 to 7, wherein the projection means (1) comprises metering means for applying a certain quantity of colourant to the distribution element (3).

9. The device according to any of claims 2 to 8, wherein each distribution element (3) is fastened to and at a distance from a holding element (9) with the aid of a corresponding spacer (8), wherein, after the distribution element (3) has been fitted in the mould cavity via an access opening to said mould cavity, the holding element (9) is configured to at least partially cover said access opening to said mould cavity.

10. The device according to claim 9 when dependent on claim 5, wherein the holding element (9) is provided with one or more blowing openings (10) for projecting the colourant therethrough with the aid of the blowing means (4).

11. The device according to any preceding claim, wherein the device is provided for projecting colourant onto side walls of a plurality of moulding trays (2) which form part of the same moulding tray section.

12. The device according to claim 9, 10 or 11 when dependent on claim 9, wherein the device comprises at least one said distribution element (3) per moulding tray (2), wherein each distribution element (3) is fastened to and at a distance from the same holding element (9) with the aid of a corresponding spacer (8), wherein, after the distribution elements (3) have been fitted in the corresponding mould cavities via a corresponding access opening to each mould cavity, the holding element (9) is configured to at least partially cover said access openings to the mould cavities.

13. A method for colouring a hand-moulded brick comprising providing a moulding tray (2), applying colour-imparting elements in the mould cavity of the moulding tray (2) and placing clay or the like into the mould cavity for moulding the hand-moulded brick, characterized in that colourant is projected onto one or more side walls of the moulding tray (2) in order to apply colourimparting elements in the mould cavity.

14. The method according to claim 13, wherein at least one distribution element (3) is fitted in the mould cavity and in that the colourant is applied to said distribution element (3), in order to be projected onto the one or more side walls via said distribution element (3).

15. The method according to claim 14, wherein the colourant is projected onto the distribution element (3) in order to apply said colourant to the distribution element (3).

16. The method according to claim 14 or claim 15, wherein the distribution element (3) is tilted during projection of colourant onto said distribution element (3).

17. The method according to any of claims 13 to 16, wherein a moulding tray section is provided with a plurality of moulding trays (2), of which said moulding tray (2) is part, in order to provide said moulding tray (2).

18. The method according to claim 17, wherein the moulding tray section is configured in two parts, with a wall part (11) which comprises the side walls of the moulding trays (2) of the moulding tray section and a bottom part which comprises the bottoms of the moulding trays (2) and in that the wall part (11) is separated from the bottom part in order to project the colourant onto the one or more side walls.

19. The method according to any of claims 13 to 18, wherein the one or more side walls are moistened before the colourant is projected onto said one or more side walls.

20. The method according to any of claims 13 to 19, wherein the colourant is projected onto the one or more side walls in powder form.

21. The method according to any of claims 13 to 20, wherein the colourant is projected with the aid of compressed air.

22. The method according to any of claims 13 to 21, wherein the colourant is projected onto the side walls of the moulding tray (2) with the aid of a device according to any of claims 1 to 12.