HK1116526A - Method for manufacturing conductive plates, applicable for covering floors or walls, conductive plate and injecting machine - Google Patents

Description

Method for producing a conductive plate suitable for covering a floor or wall, conductive plate and injection device

Technical Field

A first aspect of the invention relates generally to a method for producing conductive panels, such as tiles, sheets, mats, suitable for covering floors or walls, and in particular to a method for producing polymer cement conductive panels by injecting conductive ink into the panels during their production.

The conductive plate is understood to be a plate which is able to conduct the width of a plate produced according to the method and conduct in a plurality of selected areas.

A second aspect of the invention relates to a conductive plate obtained by the above method.

A third aspect of the invention relates to an ink injection device for carrying out the respective parts of the method according to the first aspect of the invention.

Background

For several purposes, plates without conductive properties have been provided with increased conductivity, and different solutions have been proposed. Some documents describing these schemes are described below.

Utility model ES-A-180349 proposes A brick having A groove on one side and filled with A conductive substance to form an electrically conductive circuit, the purpose of which is to act as A heat transfer device for conducting towards the remaining bricks when the circuit voltage generates heat.

Application US-A-20040109681 proposes A moulded brick having A body made of clay or cement and an electric heating element housed in the body with A cover.

Patent ES-A-2127129 proposes A method for producing A substrate, preferably made of laminated micA, printed with A hot-working varnish.

Patent EP1376015 relates to an electric radiator and a method for its production, formed by two or three glass plates with a resistive circuit formed by glass and silver in the form of an ink, and using an oil stamp between the glass plates.

Patent ES-A-2221336 proposes A heat-injected sheet, A mixture, an apparatus and A process for producing the sheet. The plate is made by injection molding and the non-conductive part or body of the plate is formed of a mixture of resin and mineral fines, while the heat transfer element, which may be a wire, is injected into the mold prior to the injection of the mineral fines-resin mixture or concrete.

None of these background documents consider heat transfer alone, nor the possibility of defining an electrically conductive area within an electrically non-conductive body, such as during the formation of a brick or panel.

On the other hand, in order to install different levels of pipeline access under a dedicated or raised floor, it is necessary to add further floors, for example relating to electrical, computer or telephone lines, and also sufficient space to cool the air between the raised floor and its floor.

It is necessary for the floor to have a good system for discharging static electricity accumulated by the wire pathways under the raised floor, and for other reasons such a system must be established.

Such A raised floor is proposed in document ES-A-1059464, which relates to A raised spiral steel pathway floor filled with mortar. The floor is formed of a steel sheet filled with mortar and a base frame or electrostatic element is installed between the floor and a series of identical tiles, the base frame being in contact with the steel sheet of the tile so that the electrostatic energy formed thereby is just discharged.

GB-a-1425977 proposes a panel for raised floors for releasing static electricity from people or objects on the floor, and comprises a non-conductive core covering the panel with a flexible carpet, the metal sheet being fixed to the bottom surface of the non-conductive core by the edges of said core, releasing the static electricity from said carpet.

The conductive contact areas described in the last two background documents are not evenly distributed or pre-distributed along the whole brick or panel, but are located at specific points.

An initial attempt to evenly distribute the conductive areas was described in US patent application US-A-20050208746, which relates to A conductive tile made from A material based on A conductive resin formed from conductive powder particles, conductive fibers, or A mixture of both. All conductive and non-conductive components can be mixed to form a brick with the mixture, such as by injection molding.

Although said us patent application achieves a uniform distribution of the conductive areas throughout the tile, enabling a uniform discharge of static electricity regardless of the point of the tile which touches the ground, said uniform distribution of the conductive particles is random, i.e. it does not define the intended conductive path from the surface to the bottom of the tile in a predetermined area, but forms a random path.

Disclosure of Invention

It seems necessary to provide an alternative to the prior art in the form of a conductive plate, as well as a method for producing such a plate and an apparatus for producing said conductive plate, so that it is better able to discharge static electricity, which, unlike the last-mentioned background document, can be used in other ways, in addition to the above-mentioned discharge of static electricity, to form a circuit by linking said conductive path with other paths, or to place it under the plate together with other conductive circuits according to previous circuit diagrams or designs, by using a predetermined and direct conductive path from the upper surface to the bottom surface of the plate and only in the required areas.

With this aim in view, a first aspect of the invention relates to a method for producing a conductive plate for covering a floor or wall, comprising the steps carried out in the following order:

a) completing a polymer concrete mixture or polymer concrete mortar,

b) placing said mortar in an empty mould having the shape of the panel to be obtained after curing of said mortar,

c) at least one through-hole, though preferably a plurality of through-holes, is made in said mortar deposited in said mould, uniformly or according to a predetermined distribution, and

d) conductive ink is injected into the hole.

Said steps c) and d) are carried out initially or during the setting of said mortar by the same tool with a series of injection needles, after which step e) of curing the polymer concrete is carried out.

Although the above steps describe only one plate, the method includes all the steps described above and below in order to obtain a plurality of conductive plates.

Comprising, after said curing step e), the following steps:

f) releasing the panel from the mold upon curing, and

g) the panels are stored in an oven or chamber and their thermal conditions are controlled, typically by use of corresponding heaters, to complete curing of the polymer concrete to form one or more panels.

In one embodiment, the method comprises performing said heating step of said step g) by adjusting the temperature to about 60 ° for about 12 hours.

After said step g), the method comprises taking one or more panels out of said oven and performing a step g1) of repairing and polishing the panels in order to obtain the desired dimensions and the desired texture and glossy outer surface of the panels.

To accomplish the mixing of step a), the method includes adding a thermosetting resin and a mineral filler such as a crosslinking component and a catalyst, and for one embodiment, a colored sand with a fluorescent pigment may also be added so that a cue can be given in a low light environment.

Although the proportions of the mixing components and the raw materials used to produce the mortar vary, for one of the examples, the proportions of the ingredients added to form the polymer concrete mixture or mortar will be listed in the following final combination:

18% of an ortho-phthalic polymer resin (ortho-phthalic polymer resin),

1% of a crosslinking component and a catalyst, and

81% quartz sand and 0.06mm to 0.8mm colored quartz.

For one embodiment, the mixing of step a) is formed by mixing polymer concrete, and the polymer concrete mortar is produced during the process of mixing the different components uniformly to form a mixture. The mixing is accomplished after the different ingredients have been mixed in the mixing chamber, while a good homogenization of the mixture is obtained by mechanical or pneumatic means.

When the mortar is obtained by mixing the components, each plate is obtained by carrying out said step b) included in the method, and the mortar is introduced into the mould in a casting manner, moved and vibrated in a controlled manner by automatic mechanical means.

The purpose of the mould is to provide a board of a desired shape, including a sheet, a tile or a lining panel. The mould is made of any material that can withstand the mechanical strength and heat resistance and chemical corrosion required by the process.

For one embodiment the moulds are moved on a conveyor belt, e.g. a carousel, so that the moulds are subjected to the different steps of the method, from casting of the mortar to demoulding.

After said step g1), the method comprises carrying out a step h) comprising quality monitoring of the board to ensure that it is at least as good as mechanical, heat resistant and conductive.

As regards the ink injected in said step d), in a preferred embodiment it comprises a mixture of silver and/or carbon graphite conductive inks to obtain the required conductivity or conductance, wherein for one embodiment it is mixed in the following proportions to obtain the final ink mixture for injection: 35% carbon ink and 65% silver ink.

For one of the embodiments, the method comprises the steps c) and d) of making the hole by means of an automatic punching device formed by a set of injection needles connected to a dosage pump, and completing the ink injection.

For another embodiment, the method includes making holes and corresponding ink injections by an automatic stamping device formed by a set of injection needles that are each attached to an injection device with a single graphite barrel, removing the set of needles from the polymer concrete, moving the set of needles in a direction generally parallel to the upper surface of the polymer concrete, then making other holes by the automatic stamping device and completing corresponding graphite injections by performing steps c) and d).

After completion of said step d), the method further comprises removing said set of needles from the polymer concrete and then subjecting the needles to a first portion cleaning step, which for one embodiment comprises applying a release fluid from the outside onto the needles for cleaning after each use with the conductive plate.

The method also includes a second step of cleaning the needles, which comprises circulating a dissolving liquid inside the needles so that they are cleaned internally after they have been used with a plurality of conductive plates.

In a second aspect, the present invention relates to a conductive plate obtained by the method according to the first aspect of the invention, which for one embodiment may be a tile adapted to be mounted on a floor, in particular a tile adapted to be used on an elevated floor; for another embodiment, the conductive plate is a panel or lining suitable for installation, connection, or leaving an intermediate space within a wall.

A third aspect of the invention relates to an injection device for use in the method according to the first aspect of the invention, in particular steps c) and d), and to the associated operations carried out with said injection needle, mainly relating to perforating and injecting operations, such as steps c) and d), and auxiliary operations such as the aforementioned cleaning.

The injection device will be described in detail in the following sections.

Drawings

The above-mentioned advantages and other features of the present invention will be more fully understood from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings, which are given by way of illustration and not of limitation, and in which:

figure 1a shows a perspective view of a tile produced according to the method of the invention,

figure 1b shows a cross-sectional elevation view of the tile of figure 1a,

FIG. 2 shows a cross-sectional side view of an injection device according to a third aspect of the invention, an

Figure 3 shows a cross-sectional elevation view of the device shown in figure 2.

Detailed Description

This section will describe the device according to the third aspect of the invention, which is suitable for implementing part of the method of producing a panel according to the first aspect of the invention, such as the panel according to the second aspect of the invention, an example of which can be seen in fig. 1a and 1b, in the form of a brick, the dots on the surface of which (see fig. 1a) indicate through-holes or channels through the body of the brick (see fig. 1b) filled with the conductive ink according to the method, the representation of the conductive paths being enlarged as they generally have only a diameter of about 0.8 to 1 mm.

Figures 2 and 3 show an embodiment of an injection device according to the third aspect of the invention comprising:

-a support structure 1 having a receiving inlet 2 for receiving each filled polymer concrete mould 3,

-automatic punching means formed by a set of injection needles 4 connected to a supply of conductive oil, for making through holes through the mortar located in said mould 3 and injecting conductive ink into said holes,

-at least one movable bearing member 5 for supporting said set of needles 4 and moving them in two directions by using first driving means between at least a first zone Z1 or injection zone and a second zone (Z2). The needles 4 in this zone are located on said mould 3 arranged in said receiving inlet 2, the second zone Z2 is remote from the first zone Z1 for performing auxiliary operations, and

-a support head 9 for supporting said set of needles 4, which can be moved upwards and downwards with respect to said carriage 5 by means of second driving means. In the embodiment shown, the second drive means comprise a cylinder 11, such as a pneumatic cylinder, which when actuated pushes the support head 9 downwards, which movement is a vertical movement relative to the mould 3 shown in this embodiment, and when the cylinder is retracted, lifts the support head 9.

For the embodiment shown in fig. 2 and 3, the movable bearing member 5 is a bearing support 5 with a guide member 6 connected to a guide structure 7 on the support structure 1 for moving the support 5 in both directions.

For the preferred embodiment, said automatic punching means constituted by said set of needles 4 are adapted to make a plurality of through holes according to a predetermined distribution, which pass through the mortar located inside said mould 3 and inject said conductive ink into said through holes.

Figures 2 and 3 show the predetermined distribution of needles 4 (and of holes) which are injected into the mortar at the same time according to a square grid formed by different rows of needles 4.

For one embodiment, the conductive ink supply includes a conductive ink dosage pump (not shown) connected to the set of injection needles 4.

The receiving entrance 2 of the support structure 1 is connected to a conveyor belt for conveying the moulds filled with polymer concrete, which conveyor belt is adapted to move the moulds, indicated with reference number 3 in figures 2 and 3, until one of the moulds is located at the receiving entrance 2, to stop the movement until step d) is completed, and then to move again so that the mould 3 filled with ink concrete leaves the receiving entrance 2 and a new mould occupies the receiving entrance 2.

For the embodiment shown, the conveyor belt comprises a series of rollers aligned in two rows with the receiving inlet 2, the rollers 12 of each row being visible in fig. 2.

In order not to exert pressure on said rollers 2 when perforating the concrete of the mould 3 with the needles 4, the device comprises a series of L-shaped angles or supports, as indicated by 13 in figures 2 and 3, which are pushed upwards to fix the mould 3, thus providing a stable bottom after the completion of steps c) and d) of the method, ensuring that the mould does not move during said steps and that the holes have a good precision.

For the embodiment shown in fig. 2 and 3, the support 13 is pushed by a cylinder 14, such as a pneumatic cylinder, forming part of the third drive means.

The composition of the device can be seen in figure 2, in which, in the second zone Z2, the element suitable for external cleaning of the needles 4 for carrying out the first step described above is a sponge 8 impregnated with a stripping liquid, which, when the needles reach the second zone Z2, is located under the needles 4 to be moved downwards by the corresponding support heads 9 for supporting the needles 4, said stripping liquid being applied to the needles 4 in order to externally clean the concrete that may have stuck to them after the completion of steps c) and d).

The movement between the first zone Z1 and the second zone Z2 is preferably carried out on the plate to be formed each time steps c) and d) are carried out, and after the needles 4 have been cleaned from the outside, the carriage 5 is again moved from the second zone Z2 to the first zone Z1.

The guide member 6, the guide structure 7, which in the embodiment shown in fig. 2 is a guide rail, and the first drive means are adapted to move the carriage 5 in cooperation to and from the third zone Z3, in which other auxiliary operations are carried out, to and from the third zone Z3, as shown in fig. 2.

It is important to underline that although three racks 5 can be seen in fig. 2, one rack 5 in each of said zones Z1, Z2 and Z3, there is only one rack 5, the three racks 5 shown in the figures representing only the possible positions of the rack 5 in three zones, one of which is shown in solid lines (the actual position of the rack 5 in said fig. 2, such as the first zone Z1) and the other two in broken lines, corresponding to the other two zones Z2 and Z3.

The proposed means included in said zone Z3 are a series of means suitable for carrying out the second step of said cleaning of the needles 4, one of which is a supply source (not shown) for supplying a circulation of dissolving liquid for the needles 4, which can thus be cleaned from the inside when appropriate, for example after a certain operating cycle or after the completion of steps c) and d) of different moulds 3 filled with polymer concrete, when the needles are located in the third zone Z3 and are connected to said source.

For the embodiment shown in fig. 2, the device also comprises another device installed in the third zone Z3, which is a funnel 10, whose function is to collect the solution as it circulates in the needle 4.

The proposed device comprises a control system (not shown) adapted to activate said first, second and third driving means.

The control system is adapted to activate the second drive means to:

-when the carriage 5 is in the injection zone Z1, moving the support head 9 and moving it together with the needle 4 towards one of the moulds 3 in order to carry out steps c) and d), and removing the needle from the inside of the mould when step d) is finished, and

when the holder 5 is in the second zone Z2, the head 9 is moved and, together with the needles 4, towards the sponge 8, so that, after a certain time, the needles are loaded with the stripping liquid and removed from the sponge 8.

The proposed device comprises fourth driving means adapted to connect the needle 4 to said supply source for supplying dissolving liquid (not shown) and to activate the supply source in order to clean the needle 4 from the inside when said holder is in said third zone Z3.

It should be emphasized that the movement of the carriage 5 along the guide structure 7 from one zone to the other zone Z1, Z2, Z3 is carried out when it is in the position shown in fig. 2, for example it is moved upwards, without coming into contact with the plate or other mechanism located below.

For another embodiment, not shown, the conductive ink supply comprises a separate ink supply system on each needle 4 of the set of needles 4, and for a different embodiment comprises an injection device with or attached to an ink tank containing the same or different type of ink.

The control system proposed by the method of the invention is adapted to activate said first and second actuating means to select the needles 4 for obtaining a predetermined distribution of holes and to control said single ink supply means to adjust the flow rate of ink supplied to each selected needle 4.

For one embodiment, the support head 9 can also be movable in a plane parallel to the bottom wall of the mould 3 and in a direction perpendicular to the direction of movement of the motorized bearing element 5.

For the last paragraph of embodiment, not shown, the support head 9 supports a row of needles 4 and, in order to obtain a predetermined distribution of needles 4 (and thus a predetermined hole), when the injection is completed, it is necessary to remove the set of needles 4 from the polymer concrete while moving the support head 9 in a direction substantially parallel to the bottom wall of the mould 3 and completing the other injection of the row of needles 4, thus obtaining, for example, a square lattice graphite filled hole obtained with a row of needles.

For a variant of the embodiment, the support head 9 is connected to a pantograph controlled by the control system. As said movable bearing member 5, said pantograph means comprise a bearing robot arm 5 and said support head 9 is supported by said bearing arm 5, which bearing arm 5 also moves on a plane parallel to the bottom wall of said mould 3 to move the support head 9, i.e. a mechanical arm determines all the movements associated with the delivery of the needles 4 to the different zones Z1, Z2, Z3 of the device and with the injection operations of a row of needles 4, so that it is possible to obtain square lattice ink filling holes made with a row of needles.

In order to obtain a predetermined distribution of a wider hole, the needles 4 of one set may be interchanged by needles 4 of another set having a different size, such as the diameter of the needles, in the device according to the invention.

For a more precise embodiment, each individual needle 4 may be interchanged in different sizes.

As previously mentioned, the conductive sheet thus obtained, whether a brick, a sheet or an inner lining panel, in addition to being able to eliminate electrostatic charges, can also complete one or more circuits, or a part of a circuit, through a predetermined connection of conductive paths formed by each hole filled with conductive ink according to the previous design.

The circuit is used on an electrical, computer or telephone line.

Any changes and modifications to the described embodiments may be made by those skilled in the art without departing from the scope of the invention as defined in the appended claims.

Claims (47)

1. A method for producing a conductive plate suitable for covering a floor or wall, comprising performing at least the following steps in sequence:

a) to form a polymer concrete mixture or mortar,

b) placing the mortar in an empty mould having a shape that results in one of the conductive plates when the mortar is cured,

c) making at least one through-hole through said mortar deposited in said mold, and

d) injecting a conductive ink into the at least one hole.

2. The method of claim 1, including performing said steps c) and d) to form a plurality of vias according to a pre-distribution.

3. The method according to claim 2, wherein steps c) and d) are carried out during the beginning or the gelling of the mortar.

4. The method according to any of the preceding claims, comprising a step e) of hardening the polymer concrete after step d).

5. The method of claim 4, further comprising, after step e), performing the steps of:

f) releasing the sheet from the mold once it has cured, and

g) the slab is placed in an oven or chamber and the thermal conditions of the slab are controlled, for a certain time and at substantially the same temperature, so as to carry out the secondary hardening of the polymer concrete forming it.

6. The method of claim 5 including effecting thermal condition control of the plate in step g) by employing plate heating at a temperature of about 60 ℃ for a time of about 12 hours.

7. The method as claimed in claim 5, characterized in that it comprises, after said step g), a step g1) of removing said plate from said oven and carrying out a step g of repairing and polishing the plate in order to obtain the desired dimensions and the desired texture and glossy outer surface, respectively.

8. The method according to claim 1, wherein step b) comprises placing the mortar in the mould by pouring, moving and vibrating the mould in a controlled manner by automatic mechanical means.

9. The method of claim 7, wherein after step g1), it comprises performing step h) comprising quality control of the resulting plate to ensure compliance with at least a range of mechanical, thermal and conductive requirements.

10. The method according to claim 1, characterized in that it comprises the addition of at least a thermosetting resin and a mineral filler for carrying out said mixing of said step a).

11. The method of claim 10, further comprising adding a crosslinking component and a catalyst for performing said mixing of said step a).

12. The method according to claim 11, characterized in that it comprises the addition of coloured sand with fluorescent pigments for carrying out said mixing of said step a).

13. A method according to claim 12, characterized in that the final percentage composition of elements added for forming the polymer concrete mixture or mortar is:

18% of an orthophthalic acid polymeric resin,

1% of a crosslinking component and a catalyst, and

81% quartz sand and 0.06mm to 0.8mm colored quartz.

14. The method of claim 1, wherein the ink injected in step d) comprises a composition of silver and/or carbon graphite conductive ink formulated to obtain a desired conductivity or conductance.

15. The method according to claim 14, wherein the composition of the ink injected in step d) is: 35% carbon ink and 65% silver ink.

16. Method according to any one of the preceding claims, characterized in that it comprises performing all the steps to obtain a plurality of conductive plates.

17. Method according to claim 16, characterized in that said holes are made and said injection of ink of said steps c) and d) is performed using an automatic punching system formed by a set of injection needles connected to a dosage pump.

18. A method according to claim 16, wherein said steps c) and d) are performed by an automatic punching device formed by a set of injection needles, each needle being connected to an injector with a respective ink tank, making some holes and making respective ink injections, moving said set of injection needles in a direction parallel to the upper surface of said polymer concrete, and then using said automatic punching device, making other holes and completing respective ink injections by performing other steps c) and d).

19. The method of claim 17, comprising, after performing said step d), removing said set of needles from the polymer concrete and then performing at least a first step of cleaning the needles.

20. A method according to claim 19, wherein the first step of cleaning the needles comprises applying a stripping liquid to the needles so that they are cleaned at least externally each time they are used with a conductive plate.

21. A method according to claim 20, including a second step of cleaning the needles, the second step including injecting a solution into the needles which is recyclable so that the needles are cleaned after use with the plurality of conductive plates.

22. A conductive plate comprising a cured polymer concrete mixture or mortar and having at least one through hole filled with a conductive ink.

23. A conduction plate as claimed in claim 22, wherein the polymer concrete mix or mortar has a plurality of through holes filled with conductive ink, the holes being distributed along the plate according to a predetermined distribution.

24. A conduction plate as claimed in claim 23, formed as a tile adapted for mounting on a floor.

25. A conduction plate according to claim 23, formed as a panel suitable for installation, connection or leaving an intermediate space in a wall.

26. Conductive plate according to any one of claims 22 to 25, obtained by a process according to any one of claims 1 to 21.

27. An injection device for producing a conductive plate suitable for covering a floor or wall, characterized in that it comprises:

-a support structure (1) having a receiving inlet (2) for receiving at least one mould (3) filled with polymer concrete or mortar,

-automatic stamping means formed by a set of injection needles (4) connected to a supply of conductive ink for making at least one through hole through the mortar located in said mould (3) and injecting the conductive ink into said at least one hole,

-at least one movable bearing (5) for supporting said group of injection needles (4) and configured to move in two directions by using first driving means between at least a first zone (Z1) in which the needles (4) are located inside said mould (3) inside said receiving inlet (2) or an injection zone and a second zone (Z2) distant from the first zone (Z2) for performing an auxiliary operation, and

-a support head (9) for supporting said set of needles (4), which can be moved upwards and downwards with respect to said carriage (5) by means of a second drive means.

28. An injection device according to claim 27, characterized in that said movable bearing member (5) is a bearing bracket (5) having at least one guide member (6) connected to at least one guide structure (7) on the support structure (1) for moving said bracket (5) therealong in said two directions.

29. The injection device according to claim 27 or 28, wherein said automatic punching means formed by said set of injection needles (4) are adapted to make a plurality of said through holes according to a predetermined distribution and to inject said conductive ink into said holes, which pass through said mortar deposited in said mould (3).

30. An injection device according to claim 29 when dependent on claim 28, wherein the conductive ink supply means comprises a conductive ink dose pump connected to the set of injection needles (4).

31. An injection device according to claim 29 when dependent on claim 27, characterized in that the electrically conductive ink supply comprises a single ink supply system for each injection needle (4) of the set of injection needles (4).

32. The injection unit of claim 31, wherein each of said individual ink supply systems comprises an injection unit with or connected to an ink tank containing the same or different type of ink.

33. An injection device according to claim 31 or 32, comprising a control system adapted to activate said first and second drive means for selecting needles (4) for obtaining a predetermined distribution of orifices and controlling said single ink supply system to adjust the rate of ink flow supplied into the selected needles (4).

34. An injection device according to claim 33, characterized in that the support head (9) is also movable in a plane parallel to the bottom wall of the mould (3) and in a direction perpendicular to the direction of movement of the movable bearing member (5).

35. An injection device according to claim 34, characterized in that the support head (9) is connected to a zoom device which is controllably operated by said control system.

36. The injection unit according to claim 35, wherein said movable bearing member (5) is a bearing robot arm (5) comprising said pantograph means, said support head (9) being at one end of said bearing arm support (5), which bearing arm (5) is also movable in said plane parallel to the bottom wall of said mold (3) to move the support head (9).

37. An injection device according to any of claims 27 to 36, characterized in that said set of injection needles (4) can be exchanged with other sets of injection needles (4) of different sizes to obtain a predetermined distribution of different holes.

38. The injection device according to claim 27 or 28, characterized in that the receiving inlet (2) of the support structure (1) is connected to a conveyor belt of the moulds for filling with polymer concrete, which conveyor belt is adapted to move the moulds until one of the moulds (3) is located in the receiving inlet (2) so as to stop the movement until step d) is completed, and then to move again in order to move the mould (3) with the concrete that has been injected with ink away from the receiving inlet (2) and a new mould occupies the receiving inlet (2).

39. The injection device according to claim 27 or 28, characterized in that it comprises, in said second zone (Z2), at least one element suitable for carrying out a first step of cleaning the needle (4).

40. Injection device according to claim 39, characterised in that said at least one element is a sponge (8) filled with a stripping liquid to be applied into the needle (4) by a corresponding downward movement of said supporting head (9) supporting said needle (4) when the needle is positioned in the second zone (Z2) below the needle (4).

41. An injection device according to claim 28, 39 or 40, characterized in that said at least one guide (6), said at least one guide structure (7) and said first drive means are also adapted to move said carriage (5) to and from a third zone (Z3) where other auxiliary operations are performed.

42. Injection device according to claim 41, characterised in that it comprises, in said third zone (Z3), at least one device suitable for carrying out the second step of cleaning the needle (4).

43. The injection device according to claim 42, comprising at least two of said means, one of which is a supply of the dissolution liquid for circulating said dissolution liquid inside the needle (4) when said needle (4) is located in the third zone (Z3) and is in corresponding communication with the needle through the supply, the other of which is a funnel (10) located below the needle (4) for receiving the dissolution liquid when the dissolution liquid is circulated inside the needle (4).

44. An injection device according to claim 28 or any of claims 39 to 43, comprising a control system adapted to activate the first and second drive means.

45. An injection device according to claim 44, wherein the control system is adapted to activate the second drive means to:

moving the support head (9) while said carriage (5) is located in the injection zone (Z1), simultaneously with the needle (4) towards one of said moulds (3), so as to make said at least one through hole through said mortar placed in said mould and complete the corresponding ink injection, then when said injection is over, removing them from the mould (3) by lifting the support head (9), and

when the holder (5) is in the second zone (Z2), the support head (9) is moved, simultaneously with the needle (4) towards the sponge (8), in order to complete the application of the stripping liquid, and then after a certain period of time they are removed from the sponge (8) by lifting the support head (9).

46. An injection device according to claim 44 when dependent on claim 43, characterized in that it comprises fourth drive means, and wherein said control system is adapted to activate said fourth drive means to connect the needle (4) to a supply for providing the dissolution liquid, to activate the supply to clean the needle (4) from inside when said carrier (5) is in said third zone (Z3).

47. An injection device according to any of claims 27 to 46, adapted to apply a method according to any of claims 17 to 21.