Press for vulcanization of vehicle tires

Abstract

A press (1) for vulcanizing vehicle tyres, comprising a base (2), a central portion (3), supported by said base (2), which defines a vulcanization cavity (4), in which the tire (5) which needs to be vulcanized is intended to be housed. The press (1) also includes an upper portion (6), which overlies the central portion (3), associated with an opening and closing mechanism (7); the opening and closing mechanism (7) is configured to position the upper portion (6) at the opening (3a), so as to close the vulcanization cavity (4), or away from the opening (3a), so as to open the vulcanization cavity (4). The press (1) also includes an inflation device (15) for the tire (5). The central portion (3) includes a plurality of radially movable mold sectors (11) which define, in the closed position, the vulcanization cavity (4) of the tire (5). The press (1) includes an induction heating system (18) of the vulcanization cavity (4).

Description

[0001] PRESS FOR VULCANIZATION OF VEHICLE TIRES

[0002] TECHNICAL FIELD OF THE INVENTION

[0003] The present invention concerns a press for vulcanizing vehicle tires.

[0004] More specifically, the present invention concerns a press for vulcanizing vehicle tires with an induction heating system.

[0005] BACKGROUND ART

[0006] In the automotive tire production field, special presses are used, into which the tire to be vulcanized is introduced, which, through a vulcanization phase, allow the internal and external profile of the tire itself to be completely formed.

[0007] This type of press usually includes a base resting on the ground and a central portion, supported by this base, which defines a vulcanization cavity.

[0008] The tire that needs to be retreaded is housed in the vulcanization cavity.

[0009] The press also includes an upper portion, which overlies the central portion.

[0010] The base, the central portion and the upper portion define a structure with a substantially cylindrical shape, with a vertical axis.

[0011] The central portion of the press usually includes a plurality of mold sectors, which are movable, each radially, from a central position, in which they define, all together, the vulcanization cavity of the tyre, to a peripheral position, in the which allow the insertion of the tire to be retreaded / vulcanized, and the extraction of the retreaded / vulcanized tyre.

[0012] Traditionally, this type of press includes a fluid heating system of the vulcanization cavity: in particular, steam is usually used as the heating fluid, which flows inside special chambers obtained in the components of the press.

[0013] The steam is produced by special centralized systems (boilers), usually supplied together with the press, and transported via pipes.

[0014] Steam production systems are expensive and cumbersome, and normally they require significant maintenance.

[0015] Instead of steam, hot oil can also be used to recirculate inside the chambers.

[0016] It is produced by special electrically powered systems which, in addition to having a high energy consumption, also require significant maintenance. Due to these notable drawbacks, presses for the retreading of tires with an electric heating system have also been proposed.

[0017] The latter include electrical resistors set in the components close to the mold.

[0018] These presses are excellent alternatives to steam-heated ones, but they are not entirely satisfactory due to the high electrical power that must be used to obtain the same performance.

[0019] AIMS OF THE INVENTION

[0020] The technical aim of the present invention is to improve the state of the art in the field of presses for vulcanizing tires.

[0021] Within such technical aim, it is an object of the present invention to develop a press for vulcanizing tires which allows the previously complained of drawbacks to be overcome.

[0022] Another object of the present invention is to create a press for vulcanizing tires characterized by lower energy consumption compared to known type presses.

[0023] Yet another object of the present invention is to make available a tire vulcanizing press which can offer a faster heating transient.

[0024] A further object of the present invention is to create a press for vulcanizing tires which does not require the installation of expensive and bulky heating fluid production systems.

[0025] This aim and these objects are all achieved by the press for vulcanizing vehicle tires according to the attached claim 1.

[0026] The press includes a base and a central portion, supported by the base, which defines a vulcanization cavity, in which the tire to be vulcanized is intended to be housed.

[0027] The central portion of the press also defines an opening for inserting the tire to be vulcanized and for extracting the vulcanized tire.

[0028] The press also includes an upper portion, which overlies the central portion, associated with an opening and closing mechanism; the opening and closing mechanism is configured to position the upper portion at the opening, so as to close the vulcanization cavity, or away from the opening, so as to open the vulcanization cavity.

[0029] The press also includes a device for inflating the tire when it is housed inside the vulcanization cavity.

[0030] The central portion includes a plurality of mold sectors, each radially movable from a central position, in which they define, all together, the vulcanization cavity of the tire, to a peripheral position, in which they allow the insertion of the tire to be vulcanized, and the extraction of the vulcanized tire.

[0031] According to one aspect of the invention, the press includes an induction heating system of the vulcanization cavity.

[0032] More specifically, the aforementioned induction heating system includes a plurality of heating plates, made of ferromagnetic material, associated with respective magnetic field generator elements, positioned at the periphery of the vulcanization cavity.

[0033] This solution allows obtaining a faster heating transient of the vulcanization cavity compared to known solutions, together with a more favorable energy expenditure of the entire process.

[0034] The dependent claims refer to preferred and advantageous embodiments of the invention.

[0035] BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Further characteristics and advantages of the present invention will be more evident from the detailed description of a preferred, but not exclusive, embodiment of a press for vulcanizing vehicle tyres, illustrated by way of example, but not by way of limitation, in the attached drawings in which: figure 1 is a perspective view of the press for vulcanizing tires according to the present invention; figure 2 is another perspective view, from a different angle, of the press; figure 3 is a top view of the press; figure 4 is a side view of the press; figure 5 is a detailed diametric section of the press, in a phase of vulcanization of a tyre; figure 6 is a perspective view from above of the press, with the upper portion open for the insertion of the tire to be vulcanized; figure 7 is a further perspective view from above of the press, with some parts of the upper portion removed for greater clarity; figure 8 is another detailed side perspective view of the press, with some parts removed for greater clarity; figure 9 is a detailed perspective view from below of the press, with some parts removed for greater clarity; figure 10 is another detailed side perspective view of the press, with some parts removed for greater clarity; figure 11 is a further detailed perspective view from above of the press, with some parts removed for greater clarity; figure 12 is a detailed cross-section of one of the sector-holder supports of the press; figure 13 is a detailed cross-section of the press base; figure 14 is a detailed cross-section of the upper portion of the press; figure 15 is a functional block diagram of the induction heating system of the press according to the invention.

[0037] EMBODIMENTS OF THE INVENTION

[0038] With reference to the attached figures, reference number 1 generally indicates a press for vulcanizing vehicle tires according to the present invention.

[0039] It is preliminarily specified that, in the following description, specifications such as upper, lower, lateral, etc., are used, in a completely conventional way, with reference to the orientation of the press 1 in its position / configuration of use; these specifications are therefore not to be understood in a restrictive sense, but they only have the purpose of improving the understanding of the features of the invention.

[0040] It should also be noted that, throughout the description, the terms "vulcanization", "vulcanize", etc. refer, in a completely general and non-limiting way, to both the process of producing new tires and the retreading of used tyres.

[0041] The press 1 includes a base 2, which rests on the ground. The press 1 also includes a central portion 3, supported by the base 2.

[0042] The central portion 3 defines a vulcanization cavity 4.

[0043] The tire 5 which must be retreaded (or even made from scratch, or, more generally, vulcanized) is intended to be housed in the vulcanization cavity 4.

[0044] The central portion 3 defines an opening 3 a for inserting the tire 5 to be vulcanized, and for extracting the vulcanized tire 5 (figure 3).

[0045] The press 1 also includes an upper portion 6; the upper portion 6 overlies the central portion 3.

[0046] The base 2, the central portion 3 and the upper portion 6 define a structure with a substantially cylindrical shape, with a vertical axis.

[0047] In particular, the upper portion 6 is associated with an opening and closing mechanism 7, which is configured to position the upper portion 6 at the opening 3a, so as to close the vulcanization cavity 4 (figures 1, 2), or away from the opening 3a, so as to open the vulcanization cavity 4 (figure 4).

[0048] More in detail, the opening and closing mechanism 7 includes an arm 8, articulated to a lateral portion 9 of the base 2.

[0049] The arm 8 is actuated by a first linear actuator 10 (for example hydraulic, electric, pneumatic, or other type), visible for example in figure 4; the first linear actuator 10 is articulated, at one end, to the lateral portion 9 of the base 2, and at the other end to the arm 8, in an articulation axis that does not coincide with that with respect to which the arm 8 itself is articulated to the lateral portion 9.

[0050] In this way, a sort of crank mechanism is created, configured to operate the arm 8 between the two aforementioned opening and closing positions of the upper portion 6.

[0051] The central portion 3 of the press 1 includes a plurality of mold sectors 11 (figure 5).

[0052] The mold sectors 11 are movable, each one, radially, from a central position, in which they define, all together, the vulcanization cavity 4 of the tire 5 (shown in particular in figure 5), to a peripheral position, in which they allow the insertion of the tire 5 to be vulcanized, and extraction of the vulcanized tire 5. More in detail, each of the mold sectors 11 is associated with a respective sectorholder support 12.

[0053] The sector-holder supports 12 are, in turn, housed inside a sleeve 13 of the central portion 3 of the press 1.

[0054] The press 1 includes an operating mechanism 14 of the sector-holder supports 12 (with the relative mold sectors 11) from the aforementioned central position to the aforementioned peripheral position, and vice versa.

[0055] The afore-mentioned operating mechanism 14 can be of any suitable type, without limitations.

[0056] The press 1 includes an inflation device 15 for the tire 5, when it is housed inside the vulcanization cavity 4.

[0057] Inside the vulcanization cavity 4, the inflation of the tire 5 is necessary to correctly carry out its vulcanization.

[0058] The inflation device 15 of the tire 5 can be of any suitable type, without limitations. Each mold sector 11 - observed in section - is substantially shaped like a "C", and it has a circumferential development of a certain angle (which obviously depends on the overall number of mold sectors 11 that the press 1 has).

[0059] Also, each sector-holder support 12 - also this one observed in section - is substantially C-shaped, so to envelop the respective mold sector 11.

[0060] The base 2 supports a lower part 16 of the mold (figure 5); the lower part 16 of the mold defines, together with the mold sectors 11 (when they are in their respective central positions), the vulcanization cavity 4 of the tire 5.

[0061] The lower part 16 of the mold (which has an annular shape) is concentric to the cylindrical symmetry axis of the press 1.

[0062] Furthermore, the upper portion 6 of the press 1 supports an upper part 17 of the mold; the upper part 17 of the mold (which has an annular shape) also defines, together with the mold sectors 11 (when they are in their respective central positions), the vulcanization cavity 4 of the tire 5.

[0063] According to one aspect of the invention, the press 1 includes an induction heating system, indicated overall with 18, of the vulcanization cavity 4 (figure 5). In particular, the induction heating system 18 includes a plurality of heating plates 19, 20, 21, made of ferromagnetic material.

[0064] The induction heating system 18 also includes a plurality of magnetic field generator elements 22, 23, 24, associated with the respective heating plates 19, 20,

[0065] 21.

[0066] The magnetic field generator elements 22, 23, 24 can include, for example, induction coils.

[0067] The heating plates 19, 20, 21, together with the respective magnetic field generator elements 22, 23, 24, are positioned on the periphery of the vulcanization cavity 4, i.e. outside the mold sectors 11, the lower part 16 of the mold and the upper part 17 of the mold.

[0068] The magnetic field generator elements 22, 23, 24 are operationally connected, and slaved, to a control unit U of the press 1, configured to electrically power the magnetic field generator elements 22, 23, 24 in such a way as to raise the temperature inside the vulcanization cavity 4 up to a desired value.

[0069] More in detail, the induction heating system 18 includes a lower heating plate 19, made of ferromagnetic material.

[0070] The lower heating plate 19 has an annular shape and is positioned below the lower part 16 of the mold (in particular, in contact with its lower surface).

[0071] Furthermore, the induction heating system 18 includes a lower generator element

[0072] 22.

[0073] The lower generator element 22 is positioned below the lower heating plate 19 (in particular, in contact with its lower surface).

[0074] As shown, in particular, in figure 11, the lower generator element 22 also has an annular shape.

[0075] The lower generator element 22 is housed inside a respective lower element-holder plate 25; the lower element-holder plate 25 is also in contact with the lower surface of the lower heating plate 19.

[0076] The induction heating system 18 also includes a lower insulating layer 26.

[0077] The lower insulating layer 26 is also in the form of an annular plate; the lower insulating layer 26 is in contact with the lower surface of the lower element-holder plate 25.

[0078] The lower insulating layer 26 rests on a lower annular support 27 of the base 2.

[0079] In another embodiment of the invention, the lower insulating layer 26 could be placed between the lower heating plate 19 and the lower element-holder plate 25.

[0080] According to another aspect of the invention, the induction heating system 18 includes an upper heating plate 20.

[0081] The upper heating plate 20 has an annular shape and is positioned above the upper part 17 of the mold (in particular, in contact with its upper surface).

[0082] Furthermore, the induction heating system 18 includes an upper generator element 23.

[0083] The upper generator element 23 is positioned above the upper heating plate 20 (in particular, in contact with its upper surface).

[0084] As shown, in particular, in figure 9, the upper generator element 23 also has an annular shape.

[0085] The upper generator element 23 is housed inside a respective upper element-holder plate 28; the upper element-holder plate 28 is also in contact with the upper surface of the upper heating plate 20.

[0086] The induction heating system 18 also includes an upper insulating layer 29.

[0087] The upper insulating layer 29 is also in the form of an annular plate; the upper insulating layer 29 is in contact with the upper surface of the upper element-holder plate 28, and with a specific abutment surface of the upper portion 6.

[0088] Therefore, the upper part 17 of the mold, the upper heating plate 20, the upper generator element 23, the upper element-holder plate 28 and the upper insulating layer 29 are all fixed, in a package, to an upper annular support 30 of the upper portion 6 of the press 1 (for example by means of screws).

[0089] In another embodiment of the invention, the upper insulating layer 29 could be placed between the upper heating plate 20 and the upper element-holder plate 28.

[0090] According to a further aspect of the invention, the induction heating system 18 includes a plurality of lateral heating plates 21. Furthermore, the induction heating system 18 includes a plurality of lateral generator elements 24, positioned in contact with respective lateral heating plates 21.

[0091] More in detail, the induction heating system 18 includes a lateral heating plate 21 for each mold sector 11 of the press 1.

[0092] Each lateral heating plate 21 is positioned in contact with the external lateral surface of the respective mold sector 11.

[0093] Furthermore, the induction heating system 18 includes a lateral generator element 24 for each mold sector 11 of the press 1.

[0094] Each lateral generator element 24 is positioned in contact with the external lateral surface of the respective lateral heating plate 21.

[0095] As shown, in particular, in figure 10, each lateral generator element 24 also has an annular, or substantially annular, shape.

[0096] Each lateral generator element 24 is housed inside a respective lateral elementholder plate 31; the lateral element-holder plate 31 is also in contact with the external lateral surface of the respective lateral heating plate 21.

[0097] The induction heating system 18 also includes a plurality of lateral insulating layers 32.

[0098] More in detail, the induction heating system 18 includes a lateral insulating layer 32 for each mold sector 11 of the press 1.

[0099] Each lateral insulating layer 32 is positioned in contact with the external lateral surface of the respective lateral element-holder plate 31.

[0100] Therefore, each mold sector 11, with the respective lateral heating plate 21, lateral generator element 24, lateral element-holder plate 31 and lateral insulating layer 32, are all fixed, in a package, to the respective sector-holder support 12 (for example using screws).

[0101] In another embodiment of the invention, each lateral insulating layer 32 could be placed between the respective lateral heating plate 21 and the respective lateral element-holder plate 31.

[0102] According to another aspect of the invention, the press 1 includes control means 33 of the induction heating system 18.

[0103] The characteristics of the aforementioned control means 33 are illustrated, in particular, in figures 12-15.

[0104] More in detail, the aforementioned control means 33 comprise, for each of the parts that define the vulcanization cavity 4, a respective temperature sensor 34, 35, 36.

[0105] Each temperature sensor 34, 35, 36 is placed in direct contact with the parts that define the vulcanization cavity 4, i.e. each mold sector 11, the lower part 16 of the mold and the upper part 17 of the mold.

[0106] Furthermore, the aforementioned control means 33 include, for each of the parts that define the vulcanization cavity 4, a respective control unit 37, 38, 39, to which a respective electrical alternating current power supply 40, 41, 42 is operationally connected and slaved: this electrical power supply 40, 41, 42 directly powers, in turn, a respective generator element 22, 23, 24.

[0107] With reference to Figure 12, the control means 33 include, for each mold sector 11, a respective lateral temperature sensor 34.

[0108] As shown, in particular, in figure 13, the lateral temperature sensor 34 is directly in contact with the outermost surface of the respective mold sensor 11 (for example, through a special hole made in the respective lateral heating plate 21).

[0109] Furthermore, the control means 33 include, for each mold sector 11, a respective lateral control unit 37, and a respective lateral electrical power supply 40, operationally connected, and slaved, to said lateral control unit 37 (see the diagram of figure 15).

[0110] The lateral power supply 40 directly powers the respective lateral generator element 24.

[0111] Each lateral temperature sensor 34 is also operationally connected, and slaved, to the respective lateral control unit 37.

[0112] In addition, and with reference to Figure 13, the control means 33 comprises a lower temperature sensor 35.

[0113] As shown, in particular, in figure 15, the lower temperature sensor 35 is directly in contact with the lower surface of the lower part 16 of the mold (for example, through a special hole made in the lower heating plate 19).

[0114] The control means 33 comprise a lower control unit 38, and a respective lower electrical power supply 41, operationally connected and slaved to said lower control unit 38 (see the diagram in Figure 15).

[0115] The lower electrical power supply 41 directly powers the lower generator element 22.

[0116] Furthermore, and with reference to Figure 14, the control means 33 comprise an upper temperature sensor 36.

[0117] As shown, in particular, in figure 17, the upper temperature sensor 36 is directly in contact with the upper surface of the upper part 17 of the mold (for example, through a special hole made in the upper heating plate 20).

[0118] The control means 33 comprise an upper control unit 39, and a respective upper electrical power supply 42, operationally connected and slaved to said upper control unit 39 (see the diagram in Figure 15).

[0119] The upper electrical supply 42 directly powers the upper generator element 23.

[0120] According to a further aspect of the invention, each of the control units 37, 38, 39 is configured to implement a specific PID type algorithm (proportional, integral and derivative) which allows - through the electrical supplies 40, 41, 42 which power the respective generator elements 22, 23, 24 - to reach a set temperature in the parts that define the vulcanization cavity 4, and to keep it constant during the operating cycle of the press 1, through the appropriate processing of the signals generated by the temperature sensors 34, 35, 36.

[0121] In an alternative and simplified embodiment of the invention, all the generator elements 22, 23, 24 could be powered by a single electrical power supply, operationally connected to a single control unit.

[0122] The operation of the press 1 according to the present invention is, in light of what has been described, completely intuitive.

[0123] At an initial stage, the upper portion 6 of the press 1 is opened, as shown in Figure 6.

[0124] In this initial phase, all the mold sectors 11 are in their respective peripheral positions.

[0125] In this configuration of the press 1, the tire 5 to be vulcanized is inserted and positioned inside the vulcanization cavity 4.

[0126] Following this, the inflation device 15 is activated, so as to position it in correspondence with the tire 5.

[0127] The upper portion 6 is then brought into the closed position of the vulcanization cavity 4, shown in Figures 1 and 2.

[0128] At this point, the operating mechanism 14 is activated, which allows the mold sectors 11 to be brought into their respective central positions, so as to approach the tire 5.

[0129] During the vulcanization cycle, in which the molds come into contact with the tire 5 to be made, the induction heating system 18 maintains (thanks to the presence of the control means 33, with the PID-type algorithm), the desired temperature inside the vulcanization cavity 4 for the time necessary to complete the production cycle. The steps just disclosed are then carried out in reverse order to extract the vulcanized tire 5 from the press 1.

[0130] It has thus been seen how the invention achieves the proposed purposes.

[0131] The press 1 according to the present invention allows to obtain a non-negligible energy saving compared to existing solutions.

[0132] Furthermore, the press 1 according to the invention is characterized by a faster heating transient compared to existing solutions.

[0133] It is added that, thanks to the characteristics of the press 1 according to the present invention, it is not necessary to install, in production sites, expensive and cumbersome heating fluid production systems, with notable advantages also in terms of time saved in carrying out maintenance.

[0134] These important results are obtained with a constructionally simple solution, practical and easy to use and with a relatively low cost.

[0135] The invention thus conceived is susceptible to numerous modifications and variations, all falling within the scope of the inventive concept.

[0136] Furthermore, all details can be replaced by other technically equivalent elements. In practice, the materials used, as well as the contingent shapes and dimensions, may be any according to needs without departing from the scope of protection of the following claims.

Claims

CLAIMS1. Press (1) for vulcanizing vehicle tyres, comprising: a base (2); a central portion (3), supported by said base (2), which defines a vulcanization cavity (4), in which the tire (5) which must be vulcanized is intended to be housed, said central portion (3) also defining an opening (3a) for inserting the tire (5) to be vulcanized, and for extracting the vulcanized tire (5); an upper portion (6), which overlies said central portion (3), associated with an opening and closing mechanism (7), said opening and closing mechanism (7) being configured to position said upper portion (6) at said opening (3a), so as to close said vulcanization cavity (4), or away from said opening (3a), so as to open said vulcanization cavity (4); an inflation device (15) of the tire (5), when it is housed inside said vulcanization cavity (4); said central portion (3) comprising a plurality of mold sectors (11) movable, each, radially, from a central position, in which they define, all together, said vulcanization cavity (4) of the tire (5), to a peripheral position, in which they allow the insertion of the tire (5) to be vulcanized, and the extraction of the vulcanized tire (5); characterized in that it comprises an induction heating system (18) of said vulcanization cavity (4).

2. Press (1) according to claim 1, wherein said induction heating system (18) comprises a plurality of heating plates (19, 20, 21), made of ferromagnetic material, associated with respective magnetic field generator elements (22, 23, 24), positioned on the periphery of said vulcanization cavity (4).

3. Press (1) according to claim 2, in which said magnetic field generator elements (22, 23, 24) are operationally connected, and slaved, to a control unit (U) of the press (1), configured for electrically power said magnetic field generator elements (22, 23, 24) in such a way as to raise the temperature inside said vulcanization cavity (4) up to a desired value.

4. Press according to claim 2 or 3, wherein said magnetic field generator elements (22, 23, 24) comprise induction coils.

5. Press (1) according to claim 3 or 4, wherein said base (2) supports a lower part (16) of the mold and said upper portion (6) supports an upper part (17) of the mold, and wherein said heating plates (19, 20, 21) and said magnetic field generator elements (22, 23, 24) are positioned outside of said mold sectors (11), of said lower part (16) of the mold and of said upper part (17) of the mold.

6. Press (1) according to claim 5, wherein said induction heating system (18) includes a lower heating plate (19), made of ferromagnetic material, of annular shape, positioned below said lower part (16) of the mold.

7. Press (1) according to claim 6, wherein said induction heating system (18) includes a lower generator element (22), of annular shape, positioned below said lower heating plate (19).

8. Press (1) according to claim 7, in which said lower generator element (22) is housed inside a respective lower element-holder plate (25), which is in contact with the lower surface of said lower heating plate (19).

9. Press (1) according to claim 8, wherein said induction heating system (18) comprises a lower insulating layer (26) which is in contact with the lower surface of said lower element-holder plate (25), said lower insulating layer (26) resting on a lower annular support (27) of said base (2).

10. Press (1) according to claim 5, wherein said induction heating system (18) includes an upper heating plate (20), made of ferromagnetic material, of annular shape, positioned above said upper part (17) of the mold.

11. Press (1) according to claim 10, wherein said induction heating system (18) includes an upper generator element (23), of annular shape, positioned above said upper heating plate (20).

12. Press (1) according to claim 11, in which said upper generator element (23) is housed inside a respective upper element-holder plate (28), which is in contact with the upper surface of said upper heating plate (20).

13. Press (1) according to claim 12, wherein said induction heating system (18) comprises an upper insulating layer (29), which is in contact with the upper surface of said upper element-holder plate (28), and with a specific abutment surface of said upper portion (6).

14. Press (1) according to claim 5, wherein said induction heating system (18) includes a plurality of lateral heating plates (21), and a plurality of lateral generator elements (24), positioned in contact with respective lateral heating plates (21).

15. Press (1) according to claim 14, wherein said induction heating system (18) includes a lateral heating plate (21) for each mold sector (11) of the press (1), positioned in contact with the external lateral surface of the respective mold sector (11).

16. Press (1) according to claim 15, wherein said induction heating system (18) includes a lateral generator element (24) for each mold sector (11), positioned in contact with the external lateral surface of the respective lateral heating plate (21).

17. Press (1) according to claim 16, in which said lateral generator element (24) is housed inside a respective lateral element-holder plate (31), which is in contact with the external lateral surface of said lateral heating plate (21).

18. Press (1) according to claim 17, wherein said induction heating system (18) further comprises a lateral insulating layer (32) for each mold sector (11) of the press (1), positioned in contact with the lateral surface outside of the respective lateral element-holder plate (31).

19. Press (1) according to one of claims 2-18, comprising control means (33) of said induction heating system (18), said control means (33) comprising, for each of the parts that define said vulcanization cavity (4), a respective temperature sensor (34, 35, 36) placed directly in contact with said parts that define said vulcanization cavity (4).

20. Press (1) according to claim 19, wherein said control means (33) comprise, for each of the parts that define said vulcanization cavity (4), a respective controlunit (37, 38, 39), to which a respective alternating current electrical power supply (40, 41, 42) is operationally connected and slaved, which in turn directly powers a respective generator element (22, 23, 24).

Images