TW201628819A - Tire preheating apparatus, tire vulcanizing system, preheating method of a tire, and production method of a tire - Google Patents

Abstract

A tire preheating apparatus (50) of the present invention includes an outer heating unit (51) which surrounds a green tire (40X) having a relatively easily vulcanizable area (A2) and a relatively hardly vulcanizable area (A1) for heating the green tire (40X) than a room temperature that is under a temperature which promote a vulcanization of the green tire (40X) from outside of the green tire (40X), and an inner heating unit (54) which is placed inside of the green tire (40) for heating the green tire (40X) than a room temperature that is under a temperature which promote a vulcanization of the green tire (40X) from inside of the green tire (40X), wherein the outer heating unit (51) has a first tire heater (52) for heating an outer surface of the relatively easily vulcanizable area (A2), and a second tire heater (53) for heating an outer surface of the relatively hardly vulcanizable area (A1) with larger quantity of heat than a quantity of heat from the first tire heater. (52).

Description

Tire preheating device, tire vulcanizing system, tire preheating method, and tire manufacturing method

The present invention relates to a tire preheating device, a tire vulcanization system, a tire preheating method, and a tire manufacturing method.

In the past, a green tire formed by a molding machine was sulfurized by a vulcanization apparatus.

Before starting the vulcanization of the green tire, it is possible to preheat the unsulfurized green tire (for example, refer to Patent Documents 1, 2), or to preheat the mold or bladder for vulcanizing the green tire (for example) Referring to Patent Documents 3 and 4), the time required for vulcanization is shortened.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Laid-Open Patent Publication No. 2009-248308

Patent Document 2: Japanese Laid-Open Patent Publication No. 2014-076581

Patent Document 3: Japanese Patent Laid-Open No. Hei 9-193160

Patent Document 4: Japanese Patent No. 4998992

In the tire, there are cases where a rubber thickness or a rubber type is different for the purpose of exhibiting desired performance. In the tires where the rubber thickness or the rubber type is different, there are the following cases: the ease of heat propagation or the ease of the sulfurization reaction are different from each other, and are present in the green tire as the material of the tire. Areas that are easily vulcanized (easy-to-sulphur areas) and areas that are not easily vulcanized (hard-to-sulfur areas).

The techniques disclosed in the above Patent Documents 1 to 4 are in the case where the sulfur-prone region and the hard-to-sulphur-added region are present in one type of green tire, and may occur in the vicinity of a temperature which can promote the sulfurization reaction in the green tire. A portion that is properly preheated, a portion that is insufficiently warmed up, and a portion that is overheated.

The present invention has been developed in view of the above problems, and an object of the present invention is to provide a tire preheating capable of preheating a green tire by appropriately matching the temperature distribution of each region to a green tire having an easy-to-add sulfur region and a hard-to-sulfur region. Apparatus, tire vulcanization system, tire preheating method, and tire manufacturing method.

A first aspect of the invention is a tire preheating device, The utility model comprises: an outer preheating part, which surrounds the outside of the green tire having an easy-to-sulphurized area and a hard-to-sulphur-added area, and can accelerate the temperature of the vulcanization reaction in the raw tire by the temperature not being full, from the aforementioned green tire The outer surface side heats the green tire to a temperature above normal temperature; and an inner preheating portion disposed inside the raw tire, and the temperature at which the temperature is not full can promote the temperature of the sulfurization reaction in the green tire, from the aforementioned green tire The inner surface side heats the raw tire to a temperature higher than or equal to a normal temperature, and the outer preheating portion has a first tire heater that heats an outer surface of the sulfur-prone region, and a second tire heater that is A higher calorific value than the aforementioned first tire heater heats the outer surface of the aforementioned hardly vulcanized region.

Because the tire preheating device causes the second tire heater to heat the outer surface of the hardly vulcanized region at a higher heat than the heating of the outer surface of the vulcanizable region by the first tire heater, Therefore, it is possible to propagate more heat to the outer surface of the hard-to-sulfur region than the outer surface of the sulfur-prone region during the period from the start of the preheating of the tire preheating device to the end of the preheating.

A second aspect of the present invention is a tire vulcanization system comprising: the tire preheating device of the above aspect; and a tire vulcanizing device which is heated to a temperature above a normal temperature by the tire preheating device and at a temperature The raw tire vulcanizing device is a tire mold which has a tire mold which surrounds the outer portion of the green tire; and a pouch which is disposed in the foregoing The inside of the raw tire, and pressurizing the green tire from the inner surface side of the green tire toward the tire mold side; and the preheating portion of the pouch, which is above normal temperature and at a temperature below, can promote the addition of the green tire The temperature of the sulfur reaction heats the outer surface of the aforementioned bladder.

Since the tire vulcanization system preheats the outer surface of the pouch bag by the tire preheating portion, the green tire and the pouch are preheated by the temperature of the temperature near the temperature by the tire preheating device. The temperature difference of the surface is small, and the temperature drop of the green tire when the green tire is preheated by the tire preheating device and the pouch is prevented. Further, according to the tire vulcanization system, the green tire can be preferably vulcanized even if the heating time is shortened.

The bag preheating portion may further include: a first bladder heater that heats a region of the outer surface of the bladder that contacts the inner surface of the sulfur-prone region; and a second bladder heater A region of the outer surface of the bladder that is in contact with the inner surface of the hard-to-sulphur-added region is heated by a higher calorific value than the first bladder heater.

In this case, since the region heated by the second bladder heater among the outer surfaces of the pockets can be made to have a higher temperature distribution than the region heated by the first bladder heater, The bladder is brought into contact with the inner surface of the green tire, so that the inner surface of the hardly vulcanizable region can be more heated than the inner surface of the sulfur-prone region to promote the sulfur addition reaction.

A third aspect of the present invention is a tire preheating method, which is characterized in that: from the outer surface side of the green tire having an easy-to-sulfurization zone and a hard-to-sulfurization zone, by relatively less the aforementioned sulfur-added zone The relatively high heat generation amount in the hard-to-sulphur-added region is used to heat the green tire to a temperature higher than normal temperature and the temperature is not sufficient to promote the temperature of the raw tire.

According to the tire preheating method, it is possible to apply more heat to the outer surface of the hardly vulcanized region of the green tire having the sulfur-prone region and the hard-to-sulfur region than the outer surface of the sulfur-prone region to pre-treat from the outer surface side. Hot birth tires.

A fourth aspect of the present invention is a tire manufacturing method comprising: a preheating process from the outer surface side of the green tire having an easy-to-sulphur zone and a hard-to-sulphur zone, by the aforementioned sulfur-added zone a relatively small amount of heat generated in the aforementioned hard-to-sulphur-added region to heat the raw tire to a temperature above normal temperature and at a temperature below which may promote the temperature of vulcanization of the raw tire; and a vulcanization process in which the pair is heated The green tire after the preheating temperature is heated so as to exceed the preheating temperature, and the green tire is vulcanized in the tire mold.

According to this tire manufacturing method, even if a green tire having an easy-to-sulphur zone and a hard-to-sulphur zone is used as a material, it is possible to carry out vulcanization with less unevenness in vulcanization degree.

A fifth aspect of the present invention is a tire manufacturing method comprising: a tire preheating process, which is from the outer surface side of the green tire having an easy-to-sulphur zone and a hard-to-sulphur zone; a relatively small area and a relatively large amount of calorific value in the hard-to-sulphur-added region to heat the raw tire to a temperature above normal temperature and the temperature is not full can promote the temperature of the raw tire to be vulcanized; and the pouch preheating process a cup that is in contact with the sulfur-adding region and has a relatively low temperature, and a surface that is in contact with the hard-to-sulfur region is relatively high-temperature, and heats a pouch disposed inside the green tire to vulcanize the green tire; And a vulcanization process, wherein the green tire after being heated to the preheating temperature is disposed in the tire mold, and the bladder is brought into contact with the inner surface of the green tire after being heated to the preheating temperature, and The green tire is heated in such a manner that the raw tire becomes a temperature exceeding the preheating temperature, and the green tire is vulcanized in the tire mold.

According to this tire manufacturing method, even if a green tire having an easy-to-sulphur zone and a hard-to-sulphur zone is used as a material, it is possible to carry out vulcanization with less unevenness in vulcanization degree.

According to the present invention, it is possible to provide a tire preheating device, a tire vulcanizing system, a tire preheating device capable of preheating a green tire with a temperature distribution suitable for each region of the green tire having an easy-to-add sulfur region and a hard-to-sulphur region. Thermal methods, and tire manufacturing methods.

1, 1A‧‧‧ tire vulcanization device

2‧‧‧ tire mold

3‧‧‧Upper side mould

4‧‧‧ lower side mould

5‧‧‧Upper traveler

6‧‧‧ lower traveler

7‧‧‧Tread mould

8‧‧‧ tread section

9‧‧‧Sliding section

10‧‧‧ pocket

11‧‧‧ Body Department

11a, 11b‧‧‧ area

12‧‧‧Upper clamping section

13‧‧‧ Lower clamping section

14‧‧‧Central institutions

15‧‧‧ pocket clamping ring

16‧‧‧ center column

16a‧‧‧ center line

17‧‧‧Mold fixing mechanism

18‧‧‧Mould lift purchase

20‧‧‧ tire heating mechanism

21‧‧‧External heating mechanism

22‧‧‧Internal heating mechanism

23‧‧‧heater

24‧‧‧radiation surface

25‧‧‧ wiring

26‧‧‧ Pressurized Medium Supply Department

27‧‧‧Pressure medium line

28‧‧‧Air compressor

29‧‧‧Pressure medium accommodation

30‧‧‧ Pouch Preheating Department

31‧‧‧First bag heater

32‧‧‧Second bag heater

40‧‧‧ tires

40X‧‧‧birth

40a‧‧‧ outer surface of the green tire

40b‧‧‧ inner surface of the green tire

40c‧‧‧Intermediate

41‧‧‧ tread

41a‧‧‧ outer surface of the tread

42‧‧‧ side wall

42a‧‧‧ outer surface of the side wall

43‧‧‧ bead

44‧‧‧ shoulder

50‧‧‧ tire preheating device

51‧‧‧External preheating department

52‧‧‧First tire heater

53‧‧‧Second tire heater

54‧‧‧Inside Preheating Department

55‧‧‧Inside radiant heat heater

55a‧‧‧ face

56‧‧‧radiation surface

60‧‧‧ tire retention mechanism

100, 100A‧‧‧ tire vulcanization system

A1‧‧‧Difficult sulfur addition area

A2‧‧‧easy sulfur zone

X‧‧‧Tread width direction

Fig. 1 is a schematic view showing a tire vulcanization system including a tire preheating apparatus according to a first embodiment of the present invention.

Fig. 2 is a schematic view showing another configuration example of the inner radiant heat heater provided in the tire preheating device.

Fig. 3 is a schematic view showing still another configuration example of the inner radiant heat heater.

Fig. 4 is a schematic view showing still another configuration example of the inner radiant heat heater.

Fig. 5 is a schematic view showing a tire vulcanization system according to a second embodiment of the present invention.

Figure 6 is a schematic illustration of a pouch preheating device for a tire vulcanization system.

Figure 7 is a schematic view showing the pouch preheating device of the tire vulcanization system.

(First embodiment)

A tire preheating apparatus according to a first embodiment of the present invention is described by exemplifying a tire vulcanizing system including a tire preheating device. Fig. 1 is a schematic view showing a tire vulcanization system including the tire preheating apparatus of the present embodiment. Fig. 2 is a schematic view showing another configuration example of the inner radiant heat heater provided in the tire preheating device. Fig. 3 is a schematic view showing still another configuration of the inner radiant heat heater of the tire preheating device.

The tire vulcanization system 100 of the present embodiment shown in Fig. 1 includes a known tire vulcanizing apparatus 1 and a tire preheating apparatus 50 for preheating and being carried into the tire vulcanizing apparatus 1. Raw tire 40X. In the present embodiment, the configuration of the tire vulcanizing apparatus 1 is not particularly limited, and thus detailed illustration and description thereof will be omitted.

As shown in Fig. 1, the tire preheating device 50 has an outer preheating portion 51 and an inner preheating portion 54.

The outer preheating portion 51 is disposed so as to surround the outside of the green tire 40X, whereby the green tire 40X is heated from the outer surface 40a of the green tire 40X. The outer preheating portion 51 heats the green tire 40X from the outer surface 40a side of the green tire 40X to a temperature higher than normal temperature at a temperature at which the temperature is not sufficient to promote the sulfurization reaction in the green tire 40X. The so-called temperature that promotes the sulfurization reaction in the green tire 40X The degree is a temperature at which the lowest temperature which is suitable as a vulcanization reaction for the sulfurization of the green tire 40X, which is determined according to the rubber type of the green tire 40X, etc., is set as the lower limit.

The outer preheating unit 51 includes a first tire heater 52 and a second tire heater 53.

The first tire heater 52 and the second tire heater 53 heat the green tire 40X from the outer surface 40a of the green tire 40X with the heat generation amount corresponding to the configuration of the green tire 40X to be vulcanized. In the following, a configuration in which the green tire 40X is preheated in the following case can be suitably exemplified, which is a case where the tread portion 41 is formed with a thicker green tire 40X than the side wall 42. In this case, the side wall 42 is the sulfur-prone region A2, and the tread portion 41 is the hard-to-sulfur region A1.

Further, the sulfur-added region A2 and the hard-to-sulphur-added region A1 may be defined in accordance with the configuration of the green tire 40X. For example, although the shoulder portion 44 of the tire 40 is formed to have a wall thickness configuration which can be preferably applied to a run-flat tire, the shoulder portion 44 in this case is generally thicker than the side wall 42. The thick portion and the easy-sulphurized region A2 with respect to the side wall 42 can define the shoulder portion 44 as the hardly-sulphurized region A1. Further, in the case where the rubber types in the tread width direction X are different from each other, or in the tread width direction X, in the tread portion 41, cerium oxide, fats and oils, other additives, and the like are partially contained in the tread portion 41. These conditions bring about the influence of vulcanization, and it is required to set the distribution of the preheating temperature in the tread portion 41. In these cases, the sulfur-prone region A2 and the hard-to-sulfur region A1 can be defined in the tread portion 41.

The first tire heater 52 is a heater that preheats the outer surface 42a of the side wall 42 of the green tire 40X. The heating mode of the first tire heater 52 is not particularly limited. For example, the first tire heater 52 may also be a heater that contacts the outer surface 42a of the side wall 42 of the green tire 40X to heat the side wall 42. Further, the first tire heater 52 may be a heater that heats the side wall 42 by a gas-like heating medium that is in contact with the outer surface 42a of the side wall 42 of the green tire 40X. Further, the first tire heater 52 may be a heater that emits radiant heat toward the outer surface 42a of the side wall 42 of the green tire 40X. Examples of the heater that emits radiant heat include an infrared heater that emits infrared rays of a wavelength that is easily absorbed by the tire. Specifically, an infrared heater that emits infrared rays having a peak in the range of 1 μm to 10 μm of the absorption wavelength of the tire can be used as the first tire heater 52 of the present embodiment. Further, an infrared heater that emits infrared rays having a peak in the range of 3 μm to 6 μm among the absorption wavelengths of the tire can be used as the first tire heater 52 of the present embodiment. As an example of such an infrared heater, a ceramic heater is mentioned. In addition, when an additive such as cerium oxide is added to the green tire 40X, the infrared heater that emits infrared rays having a wavelength different from the absorption wavelength of the additive may be used as the first. Tire heater 52.

The second tire heater 53 is a heater that preheats the outer surface 41a of the tread portion 41 of the green tire 40X. The second tire heater 53 is a heater that generates a larger amount of heat than the first tire heater 52. The heat generation method of the second tire heater 53 is not particularly limited. For example, the second tire heater 53 may also be the outer surface of the tread portion 41 of the green tire 40X. 41a is in contact with the heater for heating the tread portion 41. Further, the second tire heater 53 may be a heater that heats the tread portion 41 by a gas-like heating medium that is in contact with the outer surface 41a of the tread portion 41 of the green tire 40X. Further, the second tire heater 53 may be a heater that emits radiant heat toward the outer surface 41a of the tread portion 41 of the green tire 40X. Examples of the heater that emits radiant heat include an infrared heater that emits infrared rays of a wavelength that is easily absorbed by the tire. Specifically, an infrared heater that emits infrared rays having a peak in the range of the absorption wavelength of the tire of 3 μm to 6 μm can be used as the second tire heater 53 of the present embodiment. As an example of such an infrared heater, a ceramic heater is mentioned. In addition, when an additive such as cerium oxide is added to the green tire 40X, an infrared heater that emits infrared rays having a wavelength different from the absorption wavelength of the additive may be used as the second. Tire heater 53.

The magnitude relationship between the calorific value of the first tire heater 52 and the calorific value of the second tire heater 53 in the present specification can be considered as each unit in the outer surface 40a of the green tire 40X which is the object to be preheated. Relative heating capacity of the area.

Further, in the present specification, the magnitude relationship between the amount of heat generated by the first tire heater 52 and the amount of heat generated by the second tire heater 53 is that the first tire heater 52 and the second tire heater 53 are both infrared heaters. In the case, the absorption wavelength characteristic in the outer surface 40a of the green tire 40X which is the object to be preheated can also be considered. That is, for example, even if the outputs of the first tire heater 52 and the second tire heater 53 composed of the infrared heater are equal to each other, as long as the peak wavelengths of the radiated infrared rays are different from each other, The heating capacity is then different from each unit area in the outer surface 40a of the green tire 40X. On the other hand, even if the outputs of the first tire heater 52 and the second tire heater 53 which are constituted by the infrared heaters are equal to each other, the absorption wavelength characteristics in the outer surface 40a of the green tire 40X which is the object of preheating are Depending on the location, the heating capacity relative to each unit area of the outer surface 40a of the green tire 40X will still vary depending on the location.

In addition, the first tire heater 52 and the second tire heater 53 may be heaters whose maximum heat generation amounts are equal to each other or the maximum heat generation amount of the first tire heater 52 is larger than the second tire heater 53. . In this case, when the green tire 40X is warmed up, the heat generation state can be controlled so that the heat generation amount of the second tire heater 53 becomes larger than the heat amount of the first tire heater 52.

The inner preheating unit 54 has an inner radiant heat heater 55 that is disposed inside the green tire 40X in a state in which the tire preheating device 50 is attached with the green tire 40X. Further, the inner preheating portion 54 may be configured to preheat the inner surface 40b of the green tire 40X by using a heating medium such as high-temperature steam or gas instead of providing the inner radiant heat heater 55.

The inner radiant heat heater 55 is formed with a radiating surface 56 that radiates radiant heat toward the inner surface 40b of the green tire 40X. The heat emitted by the inner radiant heat heater 55 is mainly radiated toward the normal direction of the radiating surface 56. In the present embodiment, the radiation surface 56 of the inner radiant heat heater 55 is configured in accordance with the rubber type, thickness, or shape of the tire 40.

For example, the radiating surface 56 of the inner radiant heat heater 55 is In order to uniformly heat the entire green tire 40X, it is necessary to relatively heat a relatively large area. When an example is given, the radiation surface 56 of the inner radiant heat heater 55 has a surface 55a facing a thick portion of the rubber, and is a portion having a thick rubber thickness for the green tire 40X (in the present embodiment, The tread portion 41) transmits more radiant heat than a portion where the rubber thickness is thin (the side wall 42 in the present embodiment).

Moreover, the configuration of the radiating surface 56 is not limited to the above. As another example of the configuration of the radiation surface 56, the radiation surface 56 of the inner radiant heat heater 55 has a surface facing a portion composed of a rubber type having a high vulcanization temperature, and is a rubber type for the green tire 40X. When it differs depending on the location, more radiant heat is transmitted to a portion composed of a rubber type having a higher vulcanization temperature than a portion composed of a rubber type having a lower vulcanization temperature.

As a still further example, the radiating surface 56 of the inner radiant heat heater 55 has a surface defined by the distance between the inner radiant heat heater 55 and the inner surface 40b of the green tire 40X, which corresponds to the size of the green tire 40X. The portion that is located farther from the inner radiant heat heater 55 transmits more radiant heat than the portion located closer to the inner radiant heat heater 55.

The shape of the inner radiant heat heater 55 is not particularly limited as long as it has the above-described radiation surface 56. As an example of the shape of the inner radiant heat heater 55, for example, the inner radiant heat heater 55 is formed to have a long tread width direction X of the green tire 40X in a state where the green tire 40X is attached to the tire warming device 50. It is roughly rod-shaped.

Further, the shape of the outer surface of the inner radiant heat heater 55 may be a shape having a cylindrical surface-shaped radiating surface 56 (see Fig. 1), and an intermediate portion having a cylindrical surface in the center line direction on the radially inner side. The shape of the curved surface of the concave surface of the concave surface (see FIG. 2) and the shape of the radiation surface 56 which is formed on the outer side in the radial direction of the center surface of the cylindrical surface and formed into a spindle-shaped curved surface (see the third Figure) and so on.

Further, as shown in FIG. 4, the inner radiant heat heater 55 may have a plurality of heaters (for example, the heater 55-1, the heater 55-2, and the heater 55-3) which are arranged side by side in the tread width direction X. Heater 55-4, heater 55-5). In this case, by generating heat from a plurality of heaters (for example, heater 55-1, heater 55-2, heater 55-3, heater 55-4, heater 55-5) individually Under control, the heat reaching the inner surface 40b of the green tire 40X shown in Fig. 1 can be adjusted.

In the inner radiant heat heater 55, a known heat generation method that generates heat by receiving the supply of electric power can be appropriately selected. In other words, as the inner radiant heat heater 55 of the present embodiment, an infrared heater, a ceramic heater, a carbon heater or the like can be used. The wavelength of the radiant heat from the inner radiant heat heater 55 is preferably such that the wavelength of the green tire 40X (for example, infrared rays having a peak in a range of 3 μm or more and 6 μm or less) can be efficiently heated.

Further, the configuration of the above-described inner radiant heat heater 55 is merely an example, and the inner radiant heat heater 55 of the present embodiment is not limited to the above configuration.

The function of the tire preheating device 50 of the present embodiment and The effect is explained together with the tire preheating method and the tire manufacturing method of the present embodiment.

When the tire warming device 50 of the present embodiment is operated, the tire holding mechanism 60 shown in Fig. 1 can be used to hold the green tire, for example, in the bead 43 of the green tire 40X. The 40X is held in the tire preheating device 50.

As shown in FIG. 1, in the case where the tread portion 41 is formed with the green tire 40X thicker than the side wall 42, the tread portion 41 is less likely to be heated than the side wall 42. Further, in the case where the outer surface 40a of the green tire 40X is heated by the uniform heat generation, a thick portion is formed in the green tire 40X in terms of the temperature difference between the outer surface 40a and the intermediate portion 40c. Larger than forming a thinner part.

In the present embodiment, the outer surface 42a of the side wall 42 is preheated by the first tire heater 52, and the outer surface 41a of the tread portion 41 is preheated by the second tire heater 53, and the inner surface 40b of the green tire 40X It is preheated by the inner radiant heat heater 55. Therefore, it is possible to transfer more heat (tire preheating process) than the side wall 42 which is the vulcanizable region A2 of the green tire 40X as the tread portion 41 which is the hard-to-sulphurized region A1 of the green tire 40X.

Further, when the green tire 40X is preheated, for example, with a uniform calorific value, it is considered that it is possible to heat the hardly-sulphurized region A1 from a normal temperature to a temperature at which the temperature is insufficient to promote the temperature of vulcanization. The sulfur addition zone A2 starts the sulfur addition reaction. On the other hand, in the tire preheating device 50 of the present embodiment, it is possible to set different temperature distributions between the hardly-sulphurized region A1 (for example, the tread portion 41) and the vulcanizable region A2 (for example, the side wall 42). As a whole of the green tire 40X, the temperature of the vulcanization can be promoted to preheat the green tire 40X to the vicinity of the vulcanization start temperature.

Further, since the side wall 42 of the green tire 40X is thinner than the tread portion 41, it may be deformed by its own weight when it is too high temperature. In the present embodiment, since the side wall 42 is preheated by the first tire heater 52 having a lower heat generation than the second tire heater 53, the possibility that the pre-tweed green tire 40X is deformed by its own weight can be used. The inhibition is lower.

After the tire preheating process, the preheated green tire 40X is carried into the tire vulcanizing apparatus 1 equipped with a known tire mold, and sulfur is added under a predetermined temperature condition (sulfurization process).

The green tire 40X may be vulcanized by the above-described tire preheating process and vulcanization process, and a tread pattern or pattern may be formed on the green tire 40X.

In the present embodiment, in order to increase the temperature at which the temperature is not sufficient to promote the vulcanization, and to be the preheating temperature in the vicinity of the vulcanization start temperature, it is necessary to carry out the process with the green tire 40X in the tire preheating process. Since the sulfur region A2 and the hardly-sulphurized region A1 are preheated correspondingly, the green tire having the sulfur-prone region A2 and the hard-to-sulfur region A1 can be preheated to appropriately cope with the temperature distribution of each region.

(Second embodiment)

A second embodiment of the present invention will be described. Fig. 5 is a schematic view showing a part of the tire vulcanization system of the present embodiment. Figures 6 and 7 are schematic views showing the pouch preheating device of the tire vulcanization system.

The tire vulcanization system 100A (see FIG. 5) of the present embodiment includes the tire preheating device 50 (shown in FIG. 1) disclosed in the first embodiment; and the tire preheating device 50 The preheated tire is subjected to a vulcanized tire vulcanizing apparatus 1A (see FIGS. 5 and 6).

Since the configuration of the tire preheating device 50 of the present embodiment is the same as that of the above-described first embodiment, the description thereof will be omitted.

The tire vulcanizing apparatus 1A of the present embodiment shown in Figs. 5 and 6 includes a tire mold 2, a bladder 10, a center mechanism 14, a mold fixing mechanism 17, a mold elevating mechanism 18, a tire heating mechanism 20, and The medium supply unit 26 and the pouch preheating unit 30 are provided.

The tire mold 2 has a side mold 3, a lower side mold 4, an upper bead ring 5, a lower bead ring 6, and a tread mold 7.

The upper side mold 3 and the lower side mold 4 are molds for molding the side walls 42 of the tire 40. The upper side mold 3 is attached to the mold lifting mechanism 18. The lower side mold 4 is attached to the mold fixing mechanism 17.

The upper bead ring 5 and the lower bead ring 6 are molds for molding the two beads 43 of the tire 40.

The tread mold 7 has a tread segment 8 and a slide segment 9.

The tread segment 8 is a mold for transferring a tread pattern to the tread portion 41 of the green tire 40X.

The sliding section 9 is capable of moving toward the radial direction of the tire 40 with the tread segment 8 Move the tread section 8 in a moving way. The sliding section 9 is coupled to the mold lifting mechanism 18.

Further, the configuration of the tire mold 2 is not limited to the above configuration. For example, the configuration of the tire mold 2 can be appropriately selected in accordance with the shape of the tire to be produced and the like.

The pouch 10 is a hollow member for pressing the green tire 40X disposed in the tire mold 2 from the inside to the tire mold 2 when the tire vulcanizing apparatus 1A is used. The pouch 10 has a main body portion 11 having a shape corresponding to the inner surface shape of the green tire 40X sulphurized by the tire vulcanizing device 1A of the present embodiment; and an upper clamping portion 12 and a lower clamping portion 13, the system is linked to the central organization 14. The bladder 10 is pressed against the inner surface 40b of the green tire 40X by filling the inside of the bladder 10 with a pressurized medium (gas and liquid). Further, the pouch 10 is heated by a heater 23 to be described later, and the green tire 40X can be heated from the inner surface 40b side through the pouch 10.

Further, the configuration of the pouch 10 is not limited to the above configuration.

The center mechanism 14 includes a pair of bladder clamp rings 15 coupled to the upper clamp portion 12 and the lower clamp portion 13 of the bladder 10, and a center post 16, It is coupled to a pair of pocket clamping loops 15. The central mechanism 14 deforms the bladder 10 by allowing the pair of bladder clamping loops 15 to move relatively toward the centerline 16a of the center post 16 to enable the bladder 10 to be inserted into and out of the green tire 40X.

In addition, the configuration of the center mechanism 14 is not limited to the above configuration. to make.

The mold fixing mechanism 17 is capable of supporting the center mechanism 14 and the lower side mold 4, and supports the pouch preheating portion 30 so as to be movable.

The mold elevating mechanism 18 moves the upper side mold 3 and the tread mold 7 forward and backward toward the center line 16a of the center pillar 16 in the lower side mold 4. Further, in the present embodiment, as the mold elevating mechanism 18 brings the tread mold 7 closer to the mold fixing mechanism 17, the sliding section 9 of the tread mold 7 is moved toward the center pillar 16 side.

Further, the configuration of the mold elevating mechanism 18 is not limited to the above configuration.

The tire heating mechanism 20 has an external heating mechanism 21 that heats the green tire 40X from the outer surface 40a side of the green tire 40X through the upper side mold 3, the lower side mold 4, and the tread mold 7; and an internal heating mechanism 22, which is attached to the center post 16, and heats the green tire 40X from the inner surface 40b side of the green tire 40X.

The external heating mechanism 21 has a flow path of, for example, high-temperature steam, and the green tire 40X is heated from the outside by the heat of the high-temperature steam. Further, the configuration of the external heating mechanism 21 is not limited to the above configuration.

The internal heating mechanism 22 has a heater 23 attached to the center portion 16 and a wiring 25 that supplies electric power to the heater 23.

The heater 23 heats the tire 40 by radiant heat from the inside of the tire 40 supported by the upper and lower bead rings 5, 6. In the present embodiment, the heater 23 passes through the bladder 10 to heat the tire 40. In addition, in the tire vulcanizing apparatus 1A which does not have the pouch 10 In the case of the heater 23, the tire 40 can also be directly heated from the inner side of the tire 40.

The shape of the heater 23 is a cylindrical shape that surrounds the center pillar 16 and is coaxial with the center line 16a of the center pillar 16. On the outer circumferential surface of the heater 23, a radiation surface 24 that radiates radiant heat toward the inner surface 40b of the green tire 40X is formed.

In the heater 23, a known heat generation method in which heat is supplied by the supply of electric power is appropriately selected. That is, as the heater 23 of the present embodiment, an infrared heater, a ceramic heater, a carbon heater or the like can be used. For example, the wavelength of the radiant heat from the heater 23 preferably corresponds to the absorption wavelength characteristic of the pouch 10, and the wavelength of the pouch 10 can be efficiently heated. The heater that can heat the bladder 10 in an appropriate manner in accordance with the absorption wavelength characteristics of the resin such as rubber constituting the bladder 10 is an infrared heater having a peak in a wavelength range of 1 μm to 10 μm. For example, as the heater capable of appropriately heating the capsule 10 in accordance with the absorption wavelength characteristics of the resin such as rubber constituting the bladder 10, an infrared heater having a wavelength of about 3.5 μm as a peak is used. For example, since the ceramic heater has a peak of the wavelength of radiant heat in the range of 3 μm to 6 μm, it is particularly suitable for the heater 23 of the present embodiment. Further, although the carbon heater has a case where the peak value of the radiant heat is shorter than that of the ceramic heater, it is effective in the following points: it is required to increase the temperature to the optimum temperature and stabilize it for vulcanization. The time is shorter; and it is capable of heating at a higher temperature than ceramic heaters. Further, the heater 23 may have the same function as the inner radiant heat heater 55 disclosed in the first embodiment. (Fig. 2, Fig. 3, Fig. 4) constitutes.

The wiring 25 is disposed inside the center post 16 for connecting the heater 23 and a power source (not shown).

The pressurized medium supply unit 26 supplies the pressurized medium to the pouch 10 when vulcanizing the green tire 40X, and recovers the vulcanized pressurized medium from the inside of the pouch 10. In the present embodiment, the pressurized medium supply unit 26 has a pressurized medium line 27 which is provided in one or both of the pair of pocket clamping rings 15 and communicates with the inside of the bladder 10; And an air compressor 28 that passes in and out of the pressurized medium through the pressurized medium line 27; and pressurizes the medium containing portion 29.

As the pressurized medium, high-temperature steam or dry gas or the like can be selected. For example, when high-temperature steam is used as the pressurized medium, the pressurized medium containing portion 29 has a water tank and a boiler. Further, in the case where nitrogen gas is used as the pressurizing medium, the pressurizing medium containing portion 29 has a reservoir for holding nitrogen gas.

The pouch preheating portion 30 shown in Fig. 6 is disposed, for example, in the mold fixing mechanism 17, so that the pouch 10 can be moved.

The pouch preheating unit 30 includes a first bladder heater 31 and a second bladder heater 32.

The first bladder heater 31 and the second bladder heater 32 are heated from the outer surface of the bladder 10 by the amount of heat corresponding to the configuration of the green tire 40X (see FIG. 5) to be vulcanized. Pouch 10 In the following, a configuration in which the green tire 40X is preheated in the following manner can be suitably carried out in the same manner as in the first embodiment, and this case means that the sidewall portion 41 is formed with a side wall. 42 thicker green tire 40X sulfur case. In this case, the side wall 42 is the sulfur-prone region A2, and the tread portion 41 is the hard-to-sulfur region A1.

The first bladder heater 31 is a heater that heats the region 11a of the outer surface of the bladder 10 that is in contact with the inner surface of the vulcanizable region A2 (the side wall 42 in the present embodiment) of the green tire 40X. The heating mode of the first bladder heater 31 is not particularly limited. For example, the first bladder heater 31 may also be a heater that contacts the outer surface of the bladder 10 to heat the bladder 10. Further, the first bladder heater 31 may heat the bladder of the bladder 10 through a gas-like heating medium that is in contact with the outer surface of the bladder 10. Further, the first bladder heater 31 may be a heater that emits radiant heat toward the outer surface of the bladder 10. In the case of using a heating medium and the case of using radiant heat, even if the shape of the bladder 10 is expanded (refer to Fig. 6) or the shape in which the bladder 10 is contracted (refer to Fig. 7), the bladder 10 can be uniformly heated. The outer surface.

Examples of the heater that emits radiant heat include an infrared heater that emits infrared rays having a wavelength that is easily absorbed by the bladder 10 (for example, a ceramic heater or a carbon heater). Specifically, an infrared heater that emits infrared rays having a peak in the range of the absorption wavelength of the capsule 10 of 3 μm to 6 μm can be used as the first pocket heater 31 of the present embodiment. As an example of such an infrared heater, a ceramic heater is mentioned.

The second bladder heater 32 is a heater that heats the region 11b of the outer surface of the bladder 10 that is in contact with the inner surface of the hard-to-sulphur region A1 of the green tire 40X (the tread portion 41 in the present embodiment). Second pocket heater The heating method of 32 is not particularly limited. For example, the second bladder heater 32 may also be a heater that contacts the outer surface of the bladder 10 to heat the bladder 10. Further, the second bladder heater 32 may heat the bladder of the bladder 10 through a gas-like heating medium that is in contact with the outer surface of the bladder 10. Further, the second bladder heater 32 may be a heater that emits radiant heat toward the outer surface of the bladder 10. In the case of using a heating medium and the use of radiant heat, even if the shape of the bladder 10 is expanded or the shape of the bladder 10 is contracted, the outer surface of the bladder 10 can be uniformly heated.

Examples of the heater that emits radiant heat include an infrared heater that emits infrared rays having a wavelength that is easily absorbed by the bladder 10 (for example, a ceramic heater or a carbon heater). Specifically, an infrared heater that emits infrared rays having a peak in the range of the absorption wavelength of the capsule 10 of 3 μm to 6 μm can be used as the second pocket heater 32 of the present embodiment. As an example of such an infrared heater, a ceramic heater is mentioned.

The action and effect of the tire vulcanization system 100A of the present embodiment will be described together with the tire preheating method and the tire manufacturing method.

In the present embodiment, during the process of vulcanizing a plurality of green tires 40X, the vulcanization of the preceding green tire 40X is completed, and the subsequent green tire 40X is carried into the tire vulcanizing apparatus 1A. At least a portion of the pouch 10 is preheated by the pouch preheating portion 30 as shown in Fig. 6 (the pouch preheating process).

Further, in the present embodiment, during the period in which the preceding green tire 40X is vulcanized by the tire preheating device 50, the first step is as described above. The subsequent green tire 40X is preheated (tire preheating process) as disclosed in the embodiment.

In the process of vulcanizing the preceding green tire 40X (sulphurization process), the green tire 40X is heated to a temperature that promotes the vulcanization reaction, and after reaching the vulcanization time corresponding to the desired degree of vulcanization The vulcanized tire 40 can be cooled for the purpose of preventing over-sulfurization. Even during the cooling of the vulcanized tire 40, a certain degree of vulcanization reaction is carried out.

As the vulcanized tire 40 is cooled, the pouch 10 is also cooled. Further, after the vulcanized tire 40 is detached from the tire vulcanizing apparatus 1A, the temperature of the pouch 10 is further lowered.

In the pouch preheating process of the present embodiment, first, after the vulcanized tire 40 is detached from the tire vulcanizing apparatus 1A, the first portion of the pouch preheating unit 30 is disposed so as to surround the pouch 10 The bladder heater 31 and the second bladder heater 32. In the present embodiment, the pouch 10 is formed into a contracted shape in order to pull out the pouch 10 from the vulcanized tire 40, and the pouch preheating portion 30 is from the outer surface of the pouch 10 in the contracted state. The pouch 10 is heated sideways. Thereby, the outer surface of the pouch 10 can be kept at a temperature that does not significantly exceed the degree of vulcanization promoting temperature in the inner surface 40b of the green tire 40X. Further, among the outer surfaces of the pouch 10, the surface in contact with the sulfur-prone region A2 (the side wall 42 in the present embodiment) and the hard-to-sulfur region A1 (the tread portion 41 in the present embodiment) are in contact with each other. The surface is insulated with different temperatures.

That is, in the pouch preheating process of the present embodiment, the surface of the outer surface of the pouch 10 that is in contact with the inner surface of the tread portion 41 is The temperature is maintained at a higher temperature than the surface of the outer surface of the pouch 10 that is in contact with the inner surface of the side wall 42. Further, in the present embodiment, the inner surface 40b of the green tire 40X and the outer surface of the pouch 10 are preliminarily provided by the tire preheating device 50 and the pouch so that the temperature difference is small at the mutual contact position. The heat portion 30 is separately preheated.

As a rule, the first bladder heater 31 and the second bladder heater 32 heat the outer surface of the bladder 10 at a temperature above normal temperature and at a temperature below which promotes the sulfurization reaction in the green tire 40X. Further, it is also conceivable that the temperature of the pouch 10 is lowered after the pouch preheating portion 30 is detached from the pouch 10 until the subsequent green tire 40X is carried in, and the temperature is lower than that of the green tire 40X. The temperature is high to preheat the bladder 10. Further, it is also conceivable that the temperature of the inner surface 40b of the green tire 40X is lowered after the green tire 40X is detached from the tire preheating device 50 until being attached to the tire vulcanizing apparatus 1A, and the sulfur is added to the raw tire 40X. The temperature is increased to a slightly higher temperature to preheat the bladder 10.

That is, the pouch 10 can also be preheated to a temperature higher than the inner surface 40b of the green tire 40X by the first bladder heater 31 and the second bladder heater 32 (normal temperature, or after being preheated) The inner surface temperature is higher.

In the subsequent vulcanization process of the green tire 40X, first, the subsequent green tire 40X is carried into the tire vulcanizing apparatus 1A. In this process, first, the pouch preheating portion 30 is detached from the pouch 10, and then the green tire 40X is placed on the lower side mold 4, and then the members constituting the tire mold 2 are combined in such a manner as to surround the green tire 40X. .

Next, in the tire mold 2, the tire mold 2 and the pouch 10 is heated and the bladder 10 is pressurized, thereby beginning the vulcanization of the green tire 40X. At the beginning of the 40X vulcanization of the green tire, the outer surface of the pouch 10 is preheated by the pouch preheating portion 30 and is also hotter than normal temperature, and the inner surface 40b of the green tire 40X is provided by the tire preheating device 50. Preheated and hotter than normal temperature. Then, since the temperature difference in the contact position of the pouch 10 with the green tire 40X is small, the amount of heat movement between the green tire 40X and the pouch 10 is small. As a result, in the inner surface 40b of the green tire 40X, the vulcanization is started from a state in which the temperature distribution is appropriate for each of the side wall 42 (easy sulfur-added region A2) and the tread portion 41 (hard sulfur-added region A1). .

That is, in the present embodiment, since the vulcanization process is started, the vulcanization is started from a state in which the green tire 40X is preheated in a temperature distribution suitable for each of the sulfur-prone region A2 and the hard-to-sulfur region A1. Therefore, the time required is shorter than the case where the green tire 40X is heated from a normal temperature, and the green tire 40X can be vulcanized in such a manner as to be suitable for the sulfurization degree of the sulfur-prone region A2 and the hard-to-sulphur region A1.

The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to the embodiment, and design changes and the like without departing from the scope of the invention are also included.

[Industrial availability]

The present invention can be utilized to optimize the temperature distribution at the point of initiation of vulcanization in a system for vulcanizing green tires.

1‧‧‧ tire vulcanizing device

40X‧‧‧birth

40a‧‧‧ outer surface of the green tire

40b‧‧‧ inner surface of the green tire

41‧‧‧ tread

41a‧‧‧ outer surface of the tread

42‧‧‧ side wall

42a‧‧‧ outer surface of the side wall

43‧‧‧ bead

44‧‧‧ shoulder

50‧‧‧ tire preheating device

51‧‧‧External preheating department

52‧‧‧First tire heater

53‧‧‧Second tire heater

54‧‧‧Inside Preheating Department

55‧‧‧Inside radiant heat heater

55a‧‧‧ face

56‧‧‧radiation surface

60‧‧‧ tire retention mechanism

100‧‧‧ tire vulcanization system

A1‧‧‧Difficult sulfur addition area

A2‧‧‧easy sulfur zone

X‧‧‧Tread width direction

Claims (6)

A tire preheating device, comprising: an outer preheating portion surrounding an outer portion of a green tire having an easy-to-sulphur region and a hard-to-sulphur-added region, and promoting the vulcanization in the green tire in a temperature less than full The temperature of the reaction is heated from the outer surface side of the green tire to the normal temperature or higher; and the inner preheating portion is disposed inside the raw tire, and the temperature is not sufficient to promote the addition of the green tire. The temperature of the sulfur reaction is heated from the inner surface side of the raw tire to the normal temperature or higher, and the outer preheating portion has a first tire heater that heats the outer surface of the sulfur-prone region; The second tire heater heats the outer surface of the hard-to-sulphur-added region with a higher calorific value than the first tire heater. A tire vulcanization system, comprising: the tire preheating device according to claim 1; and a tire vulcanizing device, wherein the tire preheating device is heated to a temperature above a normal temperature and the temperature is not The raw tire that can accelerate the temperature of the vulcanization reaction is subjected to vulcanization, and the tire vulcanizing device has a tire mold that surrounds the outside of the green tire, and a pouch that is disposed inside the green tire. And pressing the green tire toward the tire mold side from the inner surface side of the green tire; and the bladder preheating portion, which is above normal temperature and at a temperature below, can promote the foregoing The temperature of the sulfurization reaction in the green tire heats the outer surface of the aforementioned bladder. The tire vulcanization system according to claim 2, wherein the pouch preheating portion has a first bladder heater that heats the outer surface of the pouch and the sulfur-added region. a region in contact with the inner surface; and a second bladder heater that heats the outer surface of the bladder to contact the inner surface of the hard-to-sulfur region in a higher heat than the first bladder heater Area. A tire preheating method, characterized in that: from the outer surface side of the green tire having an easy-to-sulphur zone and a hard-to-sulphur zone, the aforementioned hard-to-sulphur zone is relatively more by relatively small amount of the easy-to-sulphur zone The calorific value to heat the aforementioned green tire to above normal temperature and the temperature is not full can promote the temperature of the aforementioned green tire. A tire manufacturing method characterized by comprising: a preheating process from the outer surface side of the green tire having an easy-to-sulphur zone and a hard-to-sulphur zone, and the aforementioned a relatively high amount of calorific value in the hard-to-sulphur zone to heat the raw tire to above normal temperature and the temperature is not full to promote the temperature of the raw tire to be vulcanized; and the vulcanization process, after the pair is heated to the aforementioned preheating temperature The green tire is heated to a temperature exceeding the preheating temperature, and the green tire is vulcanized in the tire mold. A tire manufacturing method characterized by comprising: a tire preheating process, which is from a surface side of a green tire having an easy-to-sulphur zone and a hard-to-sulphur zone, by relatively small amount of the aforementioned sulfur-added zone The relatively high calorific value in the hard-to-sulphur-added region is used to heat the raw tire to a temperature above normal temperature and the temperature is not full to promote the temperature of vulcanization of the raw tire; and the pre-heating process of the pouch is performed with the above-mentioned easy-to-add sulfur The surface in contact with the region is a relatively low temperature, and the surface in contact with the hardly-sulphurized region is relatively high-temperature, and the bladder is disposed in the inside of the raw tire for vulcanizing the green tire; and a vulcanization process is provided. The raw tire to be heated to the preheating temperature is disposed in the tire mold, and the bladder is brought into contact with the inner surface of the green tire after being heated to the preheating temperature, so that the green tire becomes more than the foregoing The temperature of the preheating temperature is used to heat the aforementioned green tire, and the aforementioned green tire is added with sulfur in the tire mold.