TIRE MOLD LINER

Abstract

A tire mold lining (10) of the type comprising a tread and two sidewalls, said lining (10) being in the form of a shell (11) having walls (110, 111, 112, 113, 114, 115) that define a cavity suitable for receiving a heat transfer fluid, the outer face of one of the walls (110) of said shell being suitable for molding at least a portion of the tire tread. According to the invention, said shell comprises at least two separate compartments (12, 14, 15, 16, 17, 18, 19), each compartment being connected to a heat transfer fluid circuit such that at least one compartment is supplied with a heat transfer fluid from a circuit different from that of the heat transfer fluid which supplies at least one other compartment. Figure for the abstract: Fig. 1

Description

Title of the invention: MOLD LINER FOR TIRE

[0001] The invention relates to the manufacture of tires and in particular to the baking or vulcanizing molds for tires and more particularly to the sector type molds.

[0002] The manufacture of a tire includes a curing step during which a raw tire blank is molded and vulcanized to obtain a tire with the desired mechanical, geometric, and aesthetic characteristics. Curing takes place in a tire curing mold comprising an upper and a lower molding assembly, axially movable relative to each other, and a ring of radially movable sectors. More specifically, a tire curing mold primarily comprises two molding shells for the tire sidewalls and two molding rings for the tire bead, which are located axially on either side of a ring having several circumferential molding sectors for the tire tread. The internal space defined by these parts in the closed position of the mold forms a molding cavity for the tire blank.Such a baking mold is arranged within a baking press comprising, among other things, mechanisms for opening and closing the baking mold on a tire blank and for opening it in order to extract the vulcanized tire and introduce a new tire blank.

[0003] The curing of a tire blank is carried out, in a known manner, with heat supplied both inside and outside the blank. For internal curing, a flexible curing membrane is deployed in the center of the blank using a pressurized fluid such as steam, nitrogen, or hot water to press the tire blank against the walls of the mold cavity. The exterior of the mold is often placed in a steam environment, which provides heat to the outside of the tire blank. The problem with this type of curing is how to transfer the heat from the mold to the tire blank more quickly.

[0004] A solution has been described in document DE 102013222662 which proposes arranging the heating source in the mold sectors. Thus, the sectors described in this document comprise channels arranged side-by-side in the axial direction, as close as possible to the mold lining, channels through which a heat transfer fluid flows. The heat is, indeed, brought closer to the lining and therefore to the pneumatic draft to be baked, but the heating efficiency is not very good, the main cause being the thermal inertia of the parts that make up the mold and in which the said channels are embedded.

[0005] Document EP 4 140 716 partially addresses this problem by replacing the channels within a mold sector of the previous document with a shell arranged within a sector and through which a heat transfer fluid flows. The shell has one face that comes into contact with the tire blank to be baked in order to imprint the molding pattern onto the blank, the radially opposite face being configured to bear against the back of the sector, while the two axially opposed lateral faces are designed to come into contact, respectively, with the upper shell and the lower shell of the mold. Openings for the circulation of the heat transfer fluid are provided in the transverse contact faces of the two adjacent sectors.While this solution allows for rapid heating of the molded part, it does not allow for the selection of targeted temperatures in different areas of the tread molding zone, and this results in thermal efficiency that is still not optimized, as heat losses occur outside the molding cavity, via the metal parts of the mold in contact with the shell.

[0006] However, it is known that a tire curing mold is a solid, metallic mold, which implies high thermal inertia. Therefore, the formulation of the elastomeric compound in the blank must be adapted to take this into account, especially when the temperature regulation at the interface between the lining and the blank is achieved at a single temperature. Thus, the need to be able to regulate several areas of the mold at different temperatures, while also having the ability to quickly change the temperature setpoint, remains.

[0007] An objective of the invention is to remedy the drawbacks of the aforementioned documents and therefore to propose a lining for a tire mold allowing temperature regulation in different areas of it, while allowing rapid change of temperature setpoint in each of these areas.

[0008] This objective is achieved by the invention, which provides a tire mold lining of the type comprising a tread and two sidewalls, said lining comprising a shell having walls that define a cavity suitable for receiving a heat transfer fluid, the outer face of one of the walls of said shell being suitable for molding at least a portion of the tire tread or being intended to come into contact with a skin having an outer face suitable for molding at least a portion of the tire tread, characterized in that said shell comprises at least two separate compartments, each compartment being connected to a heat transfer fluid circuit such that unless one compartment is supplied by a heat transfer fluid from a circuit different from that of the heat transfer fluid which supplies at least one other compartment.

[0009] In other words, the invention provides a tire curing mold lining comprising a shell having at least two separate compartments, understood to be sealed against each other by the heat transfer fluid, arranged one after the other in the axial direction of the molding face and / or in the radial direction so as to allow temperature regulation of each compartment independently and thus obtain at least two different curing temperatures. The outer face of the wall of said shell or the outer face of said skin, which are intended for molding, extend over a portion or preferably over the entire width of the tire tread. This makes it possible to rapidly regulate the temperature at the mold-tire blank interface to at least two different temperatures, depending on the material (or elastomeric compound) of each zone.

[0010] Indeed, the shell-like construction of each compartment of the lining, which has low thermal inertia and is supplied with heat transfer fluids from separate circuits, allows for rapid temperature changes in each compartment. This makes it possible to quickly heat or cool different areas of the tire blank, for example, with a response time of less than 5 minutes between two temperature setpoint changes with a difference greater than 10°C. This allows for greater flexibility in the choice of materials used in its construction and ultimately results in tires with improved performance.

[0011] The heating element may include means for attaching the shell to a mold sector, said attachment means possibly comprising spacers that keep said shell away from the back of the sector. This construction reduces the contact surfaces between the heating element and its support, which is the back of a sector, and thus limits heat loss to other parts of the mold.

[0012] The seal may include means for attaching the shell to a mold sector by means of a support element made of a thermally insulating material. Thanks to this attachment to the back of the mold sector by means of an element made of a thermally insulating material, the seal of the invention exhibits very low thermal inertia, which further improves its operating efficiency.

[0013] Each compartment may include an inlet port and an outlet port connected to a heat transfer fluid circuit. In one embodiment, the inlet port may be on a first packing element, and subsequent packing elements may be connected to each other at the inlets or outlets.

[0014] The outlet port can be positioned to avoid a retention area of ​​heat transfer fluid or condensate. When operating with steam, the outlet port is located at the lowest point of the compartment. When operating with a heat transfer fluid, it can be placed either above or below the inlet port.

[0015] At least one of said compartments may include a molded face of the tire shoulder and at least a second compartment may include a molded face of the tread crown. This makes it possible to differentiate the shoulder area from the rest of the tread, and thus to use specific materials for the different areas of the tread. This is useful, for example, for truck tires where different performance levels are required in different areas of the tire, or for motorcycle tires where different grip performance levels are required at the shoulder and the tread crown.

[0016] Moreover, by thermally decoupling the central molding zone of the tread from the shoulder molding zone, it is possible to prevent thermal drift of the mold or temperature homogenization between the lining and the sidewall molding shells of the tire blank. This is made possible primarily by the low thermal inertia of the lining of the invention and the small cross-sections of heat transfer between the crown and shoulder areas.

[0017] The molding face of said shell may include at least one molding protrusion made in the form of a hollow compartment suitable for being connected to a heat transfer fluid circuit.

[0018] The baking temperature of the molded grooves can thus be regulated independently with respect to the protrusions of the lining. More precisely, since the protrusions are objects in contact with thin areas of the tire tread, this prevents overbaking of the elastomeric compound constituting it.

[0019] Each compartment of said shell may include an internal 3D lattice structure (also called a "lattice" structure) or one with perforated walls, for example, in a radial direction. Such a 3D lattice structure is an open structure located inside a thin-walled shell and enhances the mechanical strength of the thin-walled shell, enabling it to withstand high molding pressures while remaining permeable to the heat transfer fluid. In a preferred embodiment of the invention, the internal structure of the shell compartments comprises perforated walls arranged in a radial direction, uniformly distributed within the compartment. This facilitates the removal of any remaining powder by blowing at the end of the shell manufacturing process using a powder-based additive manufacturing method.

[0020] The housing of the fitting of the invention can be made in one piece. This makes it possible to obtain a fitting that is easy to manufacture and has a simplified structure.

[0021] In one variant, the lining of the invention can be made by an assembly of several parts, these being able to be assembled for example by welding or by means of mechanical assembly processes using sealing joints between the different compartments.

[0022] The wall thickness of said shell can be between 0.5 and 5 mm. Such a thin wall allows for the rapid transfer of heat from the heat transfer fluid to the tire blank.

[0023] The shell of the lining of the invention can have a total thickness of between 2 and 15 mm. This allows the shell to be quickly filled with heat transfer fluid for better energy efficiency, while reducing the amount of heat transfer fluid used.

[0024] The objective of the invention is also achieved with a tire mold of the type comprising a tread and two sidewalls, the mold comprising first and second molding shells of the sidewalls and a plurality of sectors distributed in the circumferential direction for molding the tread of said tire, characterized in that each of said sectors comprises a lining according to the invention.

[0025] The objective of the invention is also achieved with a method for manufacturing a mold lining for a tire of the type comprising a tread and two sidewalls, said lining comprising a shell, the walls of which define a cavity suitable for receiving a heat transfer fluid, the external face of one of the walls of said shell being suitable for molding at least a part of the tread of the tire or being intended to come into contact with a skin comprising an external face suitable for molding at least a part of the tread of the tire, characterized in that said lining is of the shell type comprising at least two separate compartments intended to receive a heat transfer fluid from different circuits, in which said lining is made by additive manufacturing.In other variations, the part can also be produced using a casting or mechanical machining process, either as a single piece or as several pieces assembled together.

[0026] The additive manufacturing process, for example based on metal powder, makes it possible to produce a seal having a shell shape, thin walls and complex geometry while giving it the mechanical resistance required to operate at high pressures.

[0027] The process may include a cleaning step by blowing and / or vibrating and / or vacuuming said compartments of the hull. This ensures that the internal space of the different compartments of the hull can be traversed by the heat transfer fluid.

[0028] The invention will be better understood from the following description, which is based on the following figures: Fig. 1 is a simplified cross-sectional view of certain components of a baking mold comprising a filling according to the invention; [Fig.2] is a perspective view of a trim according to a first embodiment of the invention; [Fig.3] is a cross-sectional view made with a plane passing through the inlet and outlet holes of a first compartment of the lining of [Fig.2]; [Fig.4] is a cross-sectional view taken with a horizontal plane perpendicular to the central axis of the mold and passing through one of the grooves of the lining of [Fig.2]; Figures 5 and 6 illustrate by cross-sectional views two variants of the implementation of the trim of [Fig.2]; [Fig.7] is a cross-sectional view of a trim according to a second embodiment of the invention; [Fig.8] is a perspective view and [Fig.9] a cross-sectional view of a trim according to a third embodiment of the invention; [Fig. 10] is a simplified cross-sectional view of certain components of a baking mold comprising a filling according to a variant of the invention.

[0029] In the various figures, identical or similar elements bear the same reference. Their description is therefore not systematically repeated.

[0030] Figure 1 is a simplified cross-sectional view of a curing mold 1 for a tire blank comprising a lining 10 according to a first embodiment of the invention. The curing mold 1 is intended for the vulcanization of a tire; it comprises several sectors 20 arranged circumferentially in the form of a ring. The sectors 20 are fitted with linings 10 having the negative imprint of the tread pattern so as to define the shape of the tread of a tire to be vulcanized. The mold also comprises an upper shell 30 and a lower shell 40, the internal surfaces of which 30a, respectively 40a, are intended for molding the sidewalls of a tire.

[0031] Such a sector-type mold is intended to be inserted between the upper and lower platens of a baking press. A baking press comprises, in a known manner, a frame forming a base for the mold, assumed to be stationary and fixed to the ground, and means for guiding and actuation (for example, hydraulic cylinders) of the drive mechanisms in an opening and closing motion of the mold, as well as an installation for providing the mold with the baking conditions. (in terms of pressure and temperature of the heat transfer fluid) required for tire vulcanization.

[0032] The baking mold 1 is substantially rotationally symmetric with central axis X-X'. The central axis extends vertically. In the following description, "axial" or "axially" refers to a direction or displacement parallel to the central axis, and "radial" or "radially" refers to a direction or displacement perpendicular to the central axis X-X'. A circumferential direction is a direction tangent to the radial direction and corresponds to the circumferential direction of the tire.

[0033] The mold illustrated in [Fig. 1] is of the "container" type, the upper shell 30 sliding axially with the upper plate of the press, the lower shell 40 being rigidly fixed to the lower plate of the press, and the circumferential sectors 20 moving radially during the opening and closing of the mold. The outer face 22 of each sector 20 has an inclined surface that is a portion of a truncated cone extending downwards and radially outwards. The press includes, in a known manner, a conical ring (not illustrated) whose radially internal surface is inclined radially downwards and has the same inclination as the radially external surfaces 22 of the sectors 20. The conical ring is connected to an actuator of the baking press, for example a hydraulic cylinder, which allows it to move axially upwards and downwards.During mold closure, the conical ring descends and positions itself on the ring of sectors 20. It then radially pulls the sectors back into the mold and applies force to the sectors to maintain the assembly closed during firing as the pressure inside the mold cavity increases. In this embodiment, the conical ring and its connecting elements to the mold sectors 20 and the upper platen of the press are of the type described in document WO 2014 / 044713.

[0034] The sector 20 is a block, made of solid steel, cast iron, aluminum, or an insulating material, and forms a support for the lining 10 intended to form the tread pattern of a portion of the tire to be molded. The lining 10 is fixed to a radially internal surface or back 21 of the sector 20.

[0035] The lining 10 of the invention is made in the form of a shell 11 having external walls 110, 111, 112, 113, 114 and 115 which define a cavity suitable for receiving a heat transfer fluid, the external face of the wall 110 of the shell being suitable for molding at least a portion of the tire tread. More particularly according to the invention, the shell 11 has at least two separate compartments 12, 14, each compartment 12, 14 being connected to a heat transfer fluid circuit such that at least one compartment 12 is supplied with a fluid heat transfer fluid from a circuit different from that of the heat transfer fluid which supplies at least a second compartment 14.

[0036] In a first embodiment, visible in Figures 1 to 6, the casing 11 comprises a central compartment 14 connected to a first heat transfer fluid circuit and two interconnected lateral compartments 12 connected to a second heat transfer fluid circuit. The heat transfer fluid from the first circuit is supplied to the central compartment 14 and is intended to regulate the temperature of the central part of the tread. The heat transfer fluid from the second circuit, circulating in the lateral compartments 12, regulates the temperature of the tire's shoulder areas.

[0037] A heat transfer fluid circuit comprises, in a known manner, a reservoir and a pump that allows the fluid to circulate between the reservoir and one of the compartments of the shell 11, via a fluid inlet and outlet opening. As more clearly seen in [Fig. 2], the central compartment 14 of the shell 11 comprises an inlet 14a and an outlet 14b connecting the central compartment to a first heat transfer fluid circuit. Similarly, the lateral compartment 12 comprises a heat transfer fluid inlet 12a and an outlet 12b connected to a second heat transfer fluid circuit. In this embodiment, the shell comprises two lateral compartments 12 communicating with each other via a connecting pipe.The outlet openings 12b, 14b are located axially lower than the inlet openings 12a, 14a, which allows condensate to drain by gravity when the heat transfer fluid is steam. For example, the heat transfer fluid can be chosen from: water, steam, oil, glycol, air, or nitrogen.

[0038] Fig. 5 illustrates the trim of Fig. 2 in which the side compartments 12 are connected together by an external tube 122 which runs outside the shell 11.

[0039] Figure 6 illustrates the fitting of Figure 2 in which the lateral compartments 12 are connected together by an internal tube 122'. This variant has the advantage of a more compact construction than that of Figure 5. In a variant not shown, the channel may be partly inside and partly outside.

[0040] A shell is understood to be a part whose walls are made of a solid material and define a hollow or permeable internal volume for a heat transfer fluid. In a preferred embodiment, the internal volume comprises a core or internal structure in the form of a 3D lattice, designed so that between the various partitions composing it there are voids that can be filled with a heat transfer fluid. This increases the rigidity of the shell and minimizes the stress-bearing surfaces between the lining 10 and the other parts of the mold. In a variant In a preferred embodiment of the invention, the internal structure of the hull compartments comprises perforated walls arranged, for example, in a radial direction, parallel to each other and uniformly distributed within each compartment. In another embodiment, the internal volume of the hull 11 is empty of any structure or core.

[0041] The thickness of the hull can vary between 2 and 15 millimeters and that of the walls of the hull can vary between 0.5 and 5 millimeters.

[0042] By external face of the wall 110 adapted to mold a portion of the tire tread, it is understood that this face comprises the geometry that is the negative of that of the portion of the tread it will mold. The external face of the wall 110 may thus include lamellae oriented substantially circumferentially and intended to form grooves in the surface of the tread, or fins oriented axially with respect to the tire, or any other relief designed for this purpose. In what follows, this set of elements present on the external face of the wall 110 of the casing 11 and intended to form the tread pattern of the tire will be referred to as protrusions 140.

[0043] In the example illustrated in [Fig. 1], the trim 10 is fixed to the back 21 of the sector 20 by means of fixing screws (not shown) which pass through the sector to cooperate with threaded holes located in the wall 113 opposite the shell 11, via spacers 23. The spacers 23 are shims that maintain a distance between the shell 11 and the back 21 of the sector 20. Thus, the presence of the point spacers 23 reduces the contact area of ​​the shell 11 with the back 21 of the sector 20, the shell 11 being separated from it by a void 24. In an alternative embodiment, these spacers 23 can be protruding threaded inserts made on the wall 113, on the back of the shell 11 and integral with it, bearing against the back of the sector 20.In another embodiment, the spacers 23 can be annular projections belonging to the back 21 of the sector 20, each being traversed by a sector fixing screw in a threaded hole in the shell 11. In a preferred embodiment of the invention, the spacers 23 are made of a thermally insulating material which is sandwiched between the threaded inserts of the shell 11 of the trim 10 and the sector 20. In yet another embodiment (not illustrated), a plate or sheet of a thermally insulating material is interposed over the entire surface of the wall 113 of the shell 11, in which case the shell can be made integral with the back 21 of the sector 20 over its entire surface without increasing its thermal inertia.

[0044] The external molding face of the wall 110 may include vent holes (not shown) allowing air to escape during vulcanization. These orifices can have dimensions between 0.08 and 5 mm or micro-slits with dimensions between 0.02 and 0.07 mm.

[0045] It is particularly advantageous to produce the lining of the invention comprising a shell whose hermetic walls enclose a 3D lattice-type mesh by an additive manufacturing process carried out from a 3D model of the shell 11. The additive manufacturing process can be a process of type SLS (Selective Laser Sintering), SLM (Selective Laser Melting), FDM (Fused Deposition Modeling), SLA (Stereolithography), DLP (Digital Light Processing), by cladding, by binder jetting, by electron beam melting or ebm.The material used is preferably a metallic powder, such as aluminum or steel powder. A polymer material, such as a thermoplastic or thermosetting polymer, with a maximum continuous short- and long-term operating temperature of at least 150°C, can also be used.

[0046] A "depowdering" or powder removal step takes place at the end of the additive manufacturing process. During this step, any remaining powder inside the shell must be removed so that it does not impede the circulation of the heat transfer fluid during operation. The inlet and outlet openings of the shell are used to remove the unsolidified powder. Depending on the shell's geometry, additional openings (not shown) may be provided in each compartment of the shell. In this case, two openings are provided for each compartment to facilitate the removal of any remaining unsolidified material after the shell geometry has been bonded, for example, using a laser beam.

[0047] Figure 7 illustrates a second embodiment of the invention in which the packing 10 comprises a three-compartment shell and three heat transfer fluid circuits allowing regulation of the packing 10 at three different temperatures. More specifically, the packing 10 comprises three compartments 15, 16 and 17 separated axially by two walls 156 and 167, each compartment being connected to its own heat transfer fluid circuit.

[0048] Figures 8 and 9 illustrate a lining with two radially separated compartments and two heat transfer fluid circuits. More specifically, the lining comprises a first compartment 18 extending along the entire length of the face intended for molding the tread of the tire to be molded and a second compartment 19 located inside the protrusions 140. The assembly of The protrusions, 140 according to this embodiment, are made in the form of hollow ducts connected to each other and to a second heat transfer fluid circuit. This allows the temperature of the protrusions to be regulated at a different temperature than that of the rest of the tread.

[0049] Figure 10 illustrates a tire mold comprising a lining 10 according to an embodiment of the invention. The lining 10 comprises a skin 50 attached to a shell 11 made as previously described, except for its face 110, which is smooth and integral with the skin 50. The skin 50 itself comprises the molding elements for the tire tread. More specifically, the skin 50 comprises an external molding face 51 with grooves 52 for contact with the tire blank. The skin 50 also comprises an internal face 53 for contact with the external wall 110 of the shell 11. The shell 11 and the skin 50 can be joined by welding, bonding, or any removable or fixed mechanical assembly method. Preferably, the shell 11 and the skin 50 are in direct contact with each other. Skin 50 is a thin element, having a thickness between 0.25 and 3 mm, from which the grooves 52 protrude.It is preferably obtained by an additive manufacturing process in a manner similar to the walls of the hull 11 as previously described, and is preferably made of the same material as the hull. In a variant, the hull and the skin are made of different materials.

[0050] In operation, a tire blank is introduced into the mold 1, which includes the lining 10 of the invention. The mold is closed, and the lining is heated according to a predetermined curing recipe, by sending the heat transfer fluid at the correct temperature into each compartment. The center of the tire is vulcanized in a known manner using a curing membrane that presses the blank against the molded faces of the linings in all sectors. At the end of the curing process, the mold is opened, and the cured tire is removed. Before opening the mold, a heat transfer fluid at a very low temperature (for example, ambient temperature) can be sent into at least one of the lining compartments to rapidly lower the temperature and cool the tire.

[0051] During laboratory tests, it was found that this type of mold allows for almost instantaneous temperature changes for each compartment of the filling. Furthermore, the mold's heating time can be drastically reduced when initially heated from ambient temperature. Thus, the filling can be brought to the cooking temperature (above 120°C) in a few minutes, compared to over an hour with a traditional baking mold. In addition, energy efficiency gains in the process are achieved. cooking has been observed, because the volume of heat transfer fluid required for cooking the tire is reduced and limited to the capacity of the different circuits.

[0052] Other variations and embodiments of the invention can be envisaged within the scope of the invention as claimed. Thus, the different embodiments can be combined with each other by arranging several heat transfer fluid circuits within a pneumatic curing mold. For example, the grooves 52 of the skin 50 can be hollow and can be connected to a heat transfer fluid circuit.

Claims

Demands

1. A tire mold lining (10) of the type comprising a tread and two sidewalls, said lining (10) comprising a shell (11) having walls (110, 111, 112, 113, 114, 115) that define a cavity adapted to receive a heat transfer fluid, the outer face of one of the walls (110) of said shell being adapted to mold at least a portion of the tire tread or being intended to come into contact with a skin (50) having an outer face (51) adapted to mold at least a portion of the tire tread, characterized in that said shell comprises at least two separate compartments (12, 14, 15, 16, 17, 18, 19), each compartment being connected to a heat transfer fluid circuit such that at least one compartment is supplied with a heat transfer fluid from a circuit different from that of the fluid heat transfer fluid that supplies at least one second compartment.

2. A trim according to claim 1, characterized in that it comprises means for fixing the shell (11) to a sector (20) of the mold, said fixing means comprising spacers (23) which keep said shell away from the back (21) of the sector (20).

3. A trim according to any one of the preceding claims, characterized in that it comprises means for fixing the shell (11) to a sector (20) of the mold by means of a support element made of a thermally insulating material.

4. A packing according to any one of the preceding claims, characterized in that each compartment comprises an inlet port and an outlet port connected to a heat transfer fluid circuit.

5. Lining according to any one of the preceding claims, characterized in that at least one of said compartments (12) comprises a molding face of the tire shoulder and in that at least a second compartment (14) comprises a molding face of the central part of the tread.

6. A lining according to any one of the preceding claims, characterized in that the molding face of said shell comprises at least one molding protrusion (140) made in the form of a hollow compartment (19) suitable for being connected to a heat transfer fluid circuit.

7. Trim according to any one of the preceding claims, characterized in that each compartment (12, 14, 15, 16, 17, 18, 19) of said shell comprises an internal structure of the 3D lattice type or having openwork walls.

8. Trim according to any one of the preceding claims, characterized in that said shell (11) is made in one piece.

9. Trim according to any one of claims 1 to 7, characterized in that said shell is made by an assembly of several parts.

10. A lining according to any one of the preceding claims, characterized in that the thickness of the walls of said shell (11) is between 0.5 and 5 mm.

11. Trim according to the preceding claim, characterized in that said shell (11) has a total thickness of between 2 and 15 mm.

12. Mold (1) for a tire of the type comprising a tread and two sidewalls, the mold comprising first and second molding shells of the sidewalls and a plurality of sectors (20) distributed in the circumferential direction for molding the tread of said tire, characterized in that each of said sectors (20) comprises a lining (10) according to any one of the preceding claims.

13. A method for manufacturing a tire mold lining (10) of the type comprising a tread and two sidewalls, said lining comprising a shell (11), the walls (110, 111, 112, 113, 114, 115) of which define a cavity suitable for receiving a heat transfer fluid, the external face of one of the walls of said shell being suitable for molding at least a part of the tread of the tire or being intended to come into contact with a skin (50) comprising an external face (51) suitable for molding at least a part of the tread of the tire, characterized in that said lining (10) is of the shell type comprising at least two separate compartments (12, 14, 15, 16, 17, 18, 19) intended to receive a heat transfer fluid from different circuits, in which said lining is produced by additive manufacturing.

14. Method according to the preceding claim, characterized in that it comprises a step of cleaning said compartments of the hull (11) by blowing and / or by vibration and / or suction.

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