JP2018192769A - Vulcanization bladder, vulcanization apparatus and vulcanization method - Google Patents

Abstract

To provide a vulcanization bladder which can elevate a temperature of a portion where a drain resides with good efficiency and can suppress vulcanization unevenness, a vulcanization apparatus and a vulcanization method.SOLUTION: A vulcanization bladder 3 conducts vulcanization molding by expansion in a lumen of an unvulcanized tire T and pushing the unvulcanized tire T to a vulcanization mold 2 positioned on the outside thereof, and contains a first bladder 6 which is in contact with an inner peripheral surface of the unvulcanized tire T and a second bladder 7 arranged inside of the first bladder 6. The second bladder 7 contains an upper portion 7A which is positioned at an upper position and a lower portion 7B positioned at a lower position when expanded in the first bladder 6. At least a part of the lower portion 7B is formed from a thin wall part 8 having small thickness.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vulcanizing bladder, a vulcanizing apparatus, and a vulcanizing method for vulcanizing and molding an unvulcanized tire against a vulcanizing mold.

  Conventionally, a vulcanizing apparatus for vulcanizing and molding an unvulcanized tire using a vulcanizing bladder is known. In this type of vulcanizing apparatus, for example, a heating fluid is supplied into a vulcanizing bladder and the vulcanizing bladder is expanded.

  For such a heated fluid, for example, steam is used from the viewpoint of cost and heat transfer performance. However, when heat is applied to the unvulcanized tire through the vulcanization bladder, the steam condenses into a drain and stays below in the vulcanization bladder.

  This drain lowers the temperature of the unvulcanized tire in contact with the drain of the vulcanizing bladder compared to the temperature of the other parts. There was a risk of causing. In addition, such a temperature decrease has also caused productivity to deteriorate because the tire vulcanization time is lengthened.

  For example, Patent Document 1 below proposes a vulcanizing apparatus that diffuses steam and sequentially supplies the steam to the entire inside of a vulcanizing bladder. The tire vulcanizing apparatus of Patent Document 1 relaxes the temperature difference of an unvulcanized tire by increasing the temperature of the drain by successively supplied steam even if the drain stays in the vulcanizing bladder.

JP 2010-110970 A

  However, although the tire vulcanizing apparatus of Patent Document 1 increases the temperature of the drain, the temperature of the unvulcanized tire in the portion still in contact with the drain of the bladder is compared with the temperature of other portions. It was lowered. For this reason, the vulcanization bladder has been desired to be further improved to eliminate the imbalance between the physical properties and performance of the tire due to uneven vulcanization.

  The present invention has been devised in view of the actual situation as described above, and based on the formation of a thin portion in the lower portion of the vulcanizing bladder, the temperature of the portion where the drain stays is efficiently increased and vulcanized. The main object is to provide a vulcanizing bladder, a vulcanizing apparatus and a vulcanizing method capable of suppressing unevenness.

  The present invention is a vulcanizing bladder that vulcanizes and presses an unvulcanized tire against a vulcanization mold located outside the vulcanized tire by expanding in the lumen of the unvulcanized tire. A first bladder in contact with the inner peripheral surface of the vulcanized tire; and a second bladder disposed on the inner side of the first bladder, wherein the second bladder is upward when inflated in the first bladder. The lower portion is located at a lower portion, and at least a part of the lower portion is formed by a thin portion having a small thickness.

  In the vulcanization bladder according to the present invention, the upper portion preferably has a substantially constant thickness, and the difference between the thickness of the upper portion and the thickness of the thin portion is preferably 1 mm or more.

  In the vulcanization bladder according to the present invention, it is desirable that the thin portion has a thickness of 1 mm or more.

  In the vulcanizing bladder according to the present invention, it is desirable that the first bladder has a substantially constant thickness.

  In the vulcanization bladder according to the present invention, the surface area of the thin portion is preferably 20% to 60% of the surface area of the lower portion.

  The present invention is preferably a vulcanizing apparatus including the vulcanizing bladder, the vulcanization mold, and a supply unit that supplies a heating fluid into the vulcanizing bladder.

  The present invention is a method of vulcanizing the unvulcanized tire using the vulcanizing bladder described above, the first expansion step of expanding the first bladder in the lumen of the unvulcanized tire, It is preferable that after the first expansion step, a closing step of closing the feeding mold and a second expansion step of expanding the second bladder after the closing step are included.

  In the tire vulcanizing method according to the present invention, the first expansion step includes a first supply step of supplying a first fluid into the first bladder, and the second expansion step includes the first expansion step. It is desirable to include the 1st discharge process which discharges the 1st fluid.

  In the tire vulcanization method according to the present invention, the second expansion step includes a second supply step of supplying a second fluid into the second bladder, and a second supply step in the second bladder after the second supply step. And a third supply step for supplying three fluids.

  In the tire vulcanizing method according to the present invention, in the second expansion step, the second bladder is brought into contact with an inner peripheral surface of the first bladder, and the unvulcanized tire is pressed against the vulcanization mold. Is desirable.

  The vulcanizing bladder according to the present invention includes a first bladder that abuts on an inner peripheral surface of an unvulcanized tire, and a second bladder that is disposed inside the first bladder. In such a vulcanizing bladder, by inflating the first bladder, the positioning accuracy of the unvulcanized tire with respect to the vulcanization mold can be improved, and the uniformity of the tire can be improved.

  In the vulcanizing bladder according to the present invention, the second bladder includes an upper part located above when expanded in the first bladder and a lower part located below, and at least a part of the lower part is It is formed by a thin portion having a small thickness. Since such a 2nd bladder is excellent in the heat transfer performance of a thin part, it can raise the temperature of the unvulcanized tire which touches a lower part efficiently. For this reason, the vulcanizing bladder can suppress uneven vulcanization of the unvulcanized tire even if the drain stays in the lower part of the second bladder.

It is sectional drawing which shows one Embodiment of the tire vulcanizing apparatus of this invention. It is a flowchart which shows one Embodiment of the tire vulcanization method of this invention. It is a flowchart of a 1st expansion process. It is sectional drawing which shows a 1st expansion process. It is sectional drawing which shows a closing process. It is a flowchart of a 2nd expansion process. It is sectional drawing which shows a 2nd expansion process.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a vulcanizing apparatus 1 according to this embodiment. As shown in FIG. 1, the vulcanizing apparatus 1 according to the present embodiment includes a vulcanizing mold 2 positioned outside the unvulcanized tire T and a vulcanizing mold 2 by pressing the unvulcanized tire T against the vulcanizing mold 2. A vulcanizing bladder 3 for vulcanization molding, a supply means 4 for supplying a heating fluid G into the vulcanizing bladder 3, and a discharging means 5 for discharging the heating fluid G in the vulcanizing bladder 3 are included. The discharge means 5 of this embodiment is provided in the supply means 4.

  The vulcanization mold 2 includes, for example, an upper mold 2A positioned above the unvulcanized tire T, a lower mold 2B positioned below, and an outer mold 2C positioned outward. The vulcanizing mold 2 can be operated in an open state (shown in FIG. 4) in which the upper mold 2A, the lower mold 2B, and the outer mold 2C are separated from each other and in a close closed state as shown in FIG. In the open state, the vulcanizing mold 2 is loaded with the unvulcanized tire T and the vulcanized tire is unloaded. In the vulcanization mold 2, the unvulcanized tire T is vulcanized and molded in a closed state.

  When the unvulcanized tire T is vulcanized and molded, the vulcanizing bladder 3 expands within the lumen of the unvulcanized tire T, thereby pressing the unvulcanized tire T against the vulcanizing mold 2. Yes. The vulcanizing bladder 3 of the present embodiment includes a first bladder 6 that contacts the inner peripheral surface of the unvulcanized tire T, and a second bladder 7 that is disposed inside the first bladder 6.

  The first bladder 6 desirably has a substantially constant thickness. Here, the “substantially constant thickness” allows variations such as manufacturing errors, and includes a range of ± 5% of the average thickness. Since the first bladder 6 is symmetrical in the vertical direction when fixed to the vulcanizing mold 2, the positioning accuracy of the vulcanizing bladder 3 with respect to the unvulcanized tire T and the non-vulcanized mold 2 are not aligned. The positioning accuracy of the vulcanized tire T can be improved.

  The first bladder 6 has, for example, a first bead portion 6a on one side and a second bead portion 6b on the other side. In the present embodiment, the first bead portion 6a is fixed to the upper die 2A side, and the second bead portion 6b is fixed to the lower die 2B side. The first bladder 6 is preferably expanded by the first fluid G1 of the heating fluid G. That is, it is desirable that the first fluid G <b> 1 of the heating fluid G is supplied to the space P formed between the first bladder 6 and the second bladder 7.

  The second bladder 7 of the present embodiment is fixed to the vulcanizing mold 2, and when inflated in the first bladder 6, an upper portion 7A located above the tire equator C and a lower portion located below. 7B.

  The upper portion 7A preferably has a substantially constant thickness t1. On the other hand, it is desirable that at least a part of the lower portion 7B is formed by the thin portion 8 having a small thickness. Such a thin part 8 is easy to transmit the heat of the heating fluid G in the second bladder 7 to the outside, and is excellent in heat transfer performance. For this reason, the 2nd bladder 7 can raise the temperature of the unvulcanized tire T which contact | connects the lower part 7B efficiently.

  The difference between the thickness t1 of the upper portion 7A and the thickness t2 of the thin portion 8 is preferably 1 mm or more. If this difference is less than 1 mm, the difference in heat transfer performance between the upper portion 7A and the thin portion 8 is small, and a temperature difference occurs in the unvulcanized tire T, which may cause uneven vulcanization of the unvulcanized tire T. There is.

  The thickness t2 of the thin portion 8 is preferably 1 mm or more. If the thickness t2 of the thin portion 8 is smaller than 1 mm, the durability of the second bladder 7 is lowered, and the second bladder 7 may be damaged early.

  The surface area of the thin portion 8 is preferably 20% to 60% of the surface area of the lower portion 7B. If the surface area of the thin portion 8 is smaller than 20% of the surface area of the lower portion 7B, the temperature of the lower portion 7B where the drain D stays is unlikely to rise, and there is a risk of uneven temperature of the unvulcanized tire T. If the surface area of the thin-walled portion 8 is larger than 60% of the surface area of the lower portion 7B, the durability of the second bladder 7 is lowered and the second bladder 7 may be damaged early.

  The second bladder 7 of the present embodiment has a bag shape on one side and has a third bead portion 7a on the other side. In the present embodiment, the third bead portion 7a is fixed to the lower mold 2B side. As will be described in detail later, the second bladder 7 is preferably expanded by the second fluid G2 of the heating fluid G and the third fluid G3 different from the second fluid G2. That is, the heating fluid G of the present embodiment includes the first fluid G1, the second fluid G2, and the third fluid G3.

  Such a vulcanizing bladder 3 can improve the positioning accuracy of the unvulcanized tire T with respect to the vulcanizing mold 2 by inflating the first bladder 6, and can improve the uniformity of the tire. . Further, by inflating the second bladder 7, the unvulcanized tire T can be pressed against the vulcanizing mold 2 through the first bladder 6, and the shape of the tire can be adjusted.

  The supply means 4 of the present embodiment includes a first supply means 4A that supplies the first fluid G1, a second supply means 4B that supplies the second fluid G2, and a third supply means 4C that supplies the third fluid G3. Is included.

  The first supply means 4A preferably includes a plurality of first supply ports 4a for supplying the first fluid G1. The 1st supply port 4a is distribute | arranged between the 2nd bead part 6b and the 3rd bead part 7a, for example. Further, it is desirable that the first fluid G1 in the first bladder 6 is discharged from the first supply port 4a.

  Here, the first fluid G1 for expanding the first bladder 6 is, for example, nitrogen N supplied from a gas supply source (not shown) to the first supply unit 4A. The nitrogen N is preferably heated by a heater (not shown) in the first supply means 4A. Such nitrogen N can stably expand the first bladder 6.

  The second supply means 4B preferably includes a plurality of second supply ports 4b for supplying the second fluid G2. The 2nd supply port 4b is distribute | arranged inside the 3rd bead part 7a, for example. The second fluid G2 in the second bladder 7 is preferably discharged from the second supply port 4b.

  Here, the second fluid G2 for expanding the second bladder 7 is, for example, the steam S supplied from the steam supply source (not shown) to the second supply unit 4B. Such steam S is excellent in heat transfer performance, and can add the amount of heat necessary to raise the temperature of the second bladder 7 at low cost.

  On the other hand, the steam S condenses by transferring the amount of heat to the second bladder 7 and may cause the drain D to stay. In the second bladder 7 of the present embodiment, even when the drain D stays, since the portion where the drain D stays is formed by the thin portion 8, the temperature decrease of the unvulcanized tire T accompanying the drain D is suppressed, The physical properties and performance of the tire can be made uniform.

  The third supply unit 4C preferably includes a plurality of third supply ports 4c for supplying the third fluid G3. The 3rd supply port 4c is distribute | arranged inside the 3rd bead part 7a adjacent to the 2nd supply port 4b, for example. Further, it is desirable that the third fluid G3 in the second bladder 7 is discharged from the third supply port 4c.

  Here, the third fluid G3 for expanding the second bladder 7 is, for example, heated nitrogen N or warm water W. In the present embodiment, the third fluid G3 is supplied with nitrogen N from a gas supply source (not shown). Nitrogen N is heated by, for example, a heater (not shown) in the third supply unit 4C.

  Since the 2nd bladder 7 is excellent in the heat transfer performance of the thin part 8, it can raise the temperature of the unvulcanized tire T which touches the lower part 7B efficiently. For this reason, the vulcanizing bladder 3 can suppress the vulcanization unevenness of the unvulcanized tire T even if the drain D stays in the lower portion 7B of the second bladder 7.

  The discharge means 5 of this embodiment includes a discharge valve (not shown) provided in the supply means 4. The discharge means 5 discharges the heating fluid G in the vulcanizing bladder 3 by, for example, stopping the supply of the heating fluid G by the supply means 4 and then opening the discharge valve. The discharge valve of the present embodiment includes a first discharge valve, a second discharge valve, and a third discharge valve provided in each of the first supply unit 4A, the second supply unit 4B, and the third supply unit 4C.

  Next, a vulcanization method for vulcanizing and molding an unvulcanized tire T by the above-described vulcanizer 1 will be described with reference to FIG. This vulcanizing method uses a vulcanizing bladder 3 having a first bladder 6 that abuts on the inner peripheral surface of the unvulcanized tire T and a second bladder 7 that is arranged inside the first bladder 6. This is a method for vulcanizing the unvulcanized tire T by pressing it against the vulcanizing mold 2.

  FIG. 2 shows a flowchart of the vulcanization method of the present embodiment. As shown in FIG. 2, in the vulcanization method of the present embodiment, a preparation step S <b> 1 is first performed in which an unvulcanized tire T for vulcanization molding is placed in the vulcanization mold 2. In the preparation step S1, the unvulcanized tire T is carried onto the lower mold 2B while the vulcanizing mold 2 is in an open state. The vulcanization mold 2 is preferably heated to about 160 to 200 ° C.

  In the vulcanization method of the present embodiment, a first expansion step S2 for expanding the first bladder 6 in the lumen of the unvulcanized tire T is performed after the preparation step S1. Such first expansion step S2 can improve the positioning accuracy of the unvulcanized tire T with respect to the vulcanization mold 2 and can improve the uniformity of the tire.

  FIG. 3 shows a flowchart of the first expansion step S2. As shown in FIG. 3, the first expansion step S <b> 2 of the present embodiment includes a first supply step S <b> 21 for supplying the first fluid G <b> 1 into the first bladder 6. In the first supply step S21, for example, heated nitrogen N is used as the first fluid G1 supplied to the first bladder 6. In the first supply step S21, the first fluid G1 is preferably supplied so that the internal pressure of the first bladder 6 is 30 to 70 kPa.

  FIG. 4 is a cross-sectional view showing the first expansion step S2. As shown in FIG. 4, in the first expansion step S <b> 2 of the present embodiment, the first bladder 6 is expanded while the vulcanization mold 2 is in an open state. In the first expansion step S2, since the first bladder 6 is expanded with a small internal pressure, the position of the unvulcanized tire T with respect to the vulcanization mold 2 is accurately determined before the vulcanization mold 2 is closed. Can be maintained.

  As shown in FIG. 2, in the vulcanization method of the present embodiment, a closing step S3 for closing the vulcanization mold 2 is performed after the first expansion step S2. By such a closing step S3, the vulcanizing mold 2 can be closed, and the unvulcanized tire T can be vulcanized.

  FIG. 5 is a cross-sectional view showing the closing step S3. As shown in FIG. 5, the closing step S <b> 3 of the present embodiment is such that the upper mold 2 </ b> A and the outer mold 2 </ b> C of the open vulcanized mold 2 and the lower mold 2 </ b> B into which the unvulcanized tire T is carried are moved up and down. The vulcanization mold 2 is moved so as to be close to the direction. In the closing step S3 at this time, the upper mold 2A and the outer mold 2C may be moved, or the lower mold 2B may be moved. Further, in the closing step S3, both the upper mold 2A and the outer mold 2C and the lower mold 2B may be moved.

  The closing step S3 then moves the outer mold 2C so that the outer mold 2C and the upper mold 2A and the lower mold 2B are close to each other in the horizontal direction, and a vulcanization mold as shown in FIG. 2 is desirable.

  As shown in FIG. 2, in the vulcanization method of the present embodiment, a second expansion step S4 for expanding the second bladder 7 is performed after the closing step S3. In the second expansion step S <b> 4, it is desirable that the second bladder 7 is brought into contact with the inner peripheral surface of the first bladder 6 and the unvulcanized tire T is pressed against the vulcanizing mold 2 through the first bladder 6. Such 2nd expansion process S4 can arrange the shape of a tire.

  FIG. 6 shows a flowchart of the second expansion step S4. As shown in FIG. 6, the second expansion step S <b> 4 of the present embodiment includes a second supply step S <b> 41 for supplying the second fluid G <b> 2 into the second bladder 7. In the second supply step S41, for example, the steam S is used as the second fluid G2 supplied to the second bladder 7. In the second supply step S41, the second fluid G2 is preferably supplied so that the internal pressure of the second bladder 7 is 1300 to 1700 kPa.

  In such a second supply step S41, since the second bladder 7 can press the unvulcanized tire T against the vulcanization mold 2 via the first bladder 6, the uniformity of the tire can be improved. Further, the steam S used in the second supply step S41 has excellent heat transfer performance, and can add a heat amount necessary for increasing the temperature of the second bladder 7 at a low cost.

  The second expansion step S4 of the present embodiment includes a first discharge step S42 for discharging the first fluid G1 in the first bladder 6. The first discharge step S42 is desirably performed simultaneously with the second supply step S41. The first discharge step S42 is performed, for example, by stopping the first supply step S21 and opening a first discharge valve (not shown) provided in the first supply unit 4A. In such a first discharge step S42, the first fluid G1 in the first bladder 6 can be smoothly discharged by the pressure of the second bladder 7.

  The second expansion step S4 of the present embodiment includes a third supply step S43 for supplying the third fluid G3 into the second bladder 7. The third supply step S43 is desirably performed after the second supply step S41 and the first discharge step S42. In the third supply step S43, for example, heated nitrogen N is used as the third fluid G3 supplied to the second bladder 7. In the third supply step S43, the third fluid G3 is preferably supplied so that the internal pressure of the second bladder 7 is 1300 to 1700 kPa.

  The third supply step S43 is desirably performed after the unvulcanized tire T is vulcanized for a predetermined time in the second supply step S41 and then the second supply step S41 is stopped. The third supply step S43 may be performed after discharging the second fluid G2 in the second bladder 7 to the outside, or may be performed while discharging the second fluid G2 to the outside.

  FIG. 7 is a cross-sectional view showing the second expansion step S4. As shown in FIG. 7, in the second expansion step S4 of the present embodiment, the second bladder 7 is expanded when the vulcanization mold 2 is in the closed state. In the second expansion step S4, since the second bladder 7 presses the unvulcanized tire T against the vulcanization mold 2 via the first bladder 6, the shape of the tire can be adjusted.

  In the second expansion step S4, heat is supplied from the heated second fluid G2 to the unvulcanized tire T via the first bladder 6 and the second bladder 7. In the second expansion step S4, the portion where the drain D of the second bladder 7 stays is the thin portion 8 having excellent heat transfer performance, so that the physical properties and performance of the tire can be made uniform.

  As shown in FIG. 2, in the vulcanization method of the present embodiment, a discharge step S5 for discharging the heated fluid G in the vulcanizing bladder 3 is performed after the second expansion step S4. The discharge step S5 of the present embodiment is performed by opening all the discharge valves provided in the supply unit 4. In the discharging step S5, the heating fluid G in the vulcanizing bladder 3 may be forcibly discharged by a known suction means.

  In the vulcanization method according to the present embodiment, after the discharge step S5, an extraction step S6 for taking out the vulcanized tire from the vulcanization mold 2 is performed. In the extraction step S6, the vulcanizing mold 2 is opened and the vulcanized tire is taken out.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to the said embodiment, It can deform | transform and implement in a various aspect.

  For example, in the above-described embodiment, a mode in which one second bladder 7 is arranged inside the first bladder 6 is illustrated, but the vulcanizing bladder 3 includes a plurality of second bladders inside the first bladder 6. A bladder 7 may be provided. In this case, the plurality of second bladders 7 may be divided in the vertical direction or may be divided in the circumferential direction. Even in this case, it is desirable that the portion where the drain of the second bladder 7 stays includes the thin portion 8.

  In the tire vulcanizing method of Examples 1 to 3 using the vulcanizing bladder including the first bladder and the second bladder having the thin wall portion shown in FIG. 1, 100 unvulcanized tires of size 205 / 60R16 each. Vulcanized and molded. Further, in the tire vulcanization methods of Comparative Examples 1 to 3 using a vulcanizing bladder without a second bladder and Comparative Example 4 using a vulcanizing bladder in which the second bladder does not have a thin portion, the same. 100 unvulcanized tires of each size were vulcanized and molded. When these unvulcanized tires were vulcanized, the vulcanization time, conicity, and rolling resistance were determined.

<Vulcanization time>
The temperature change of the tire was measured when each unvulcanized tire was vulcanized. The tire temperature was measured at point T1 of the tire in FIG. From the temperature change at this time, the equivalent vulcanization amount (ECU) at point T1 was calculated, and the vulcanization time until the ECU reached 20 was obtained. The average value of 100 tires is obtained, and the result is displayed as an index with Comparative Example 1 being 100. The smaller the value, the shorter the vulcanization time and the better the time shortening effect.

<Conicity>
The lateral force variation (LFV) of each vulcanized tire was measured using a tire uniformity testing machine. Lateral force variation corresponds to the size of conicity. The average value of 100 tires is obtained, and the result is displayed as an index with Comparative Example 1 being 100. The smaller the numerical value, the smaller the conicity and the better the straight running stability performance.

<Rolling resistance>
Using a rolling resistance testing machine, the rolling resistance of each vulcanized tire was measured. The average value of 100 tires is obtained, and the result is displayed as an index with Comparative Example 1 being 100. The smaller the value, the smaller the rolling resistance and the better the fuel efficiency.
The test results are shown in Table 1.

  As is clear from Table 1, it was confirmed that the example shortened the time required for vulcanization while maintaining the same conicity and rolling resistance as compared with Comparative Example 1.

2 Vulcanizing mold 3 Vulcanizing bladder 6 1st bladder 7 2nd bladder 7A Upper part 7B Lower part 8 Thin part T Unvulcanized tire

Claims (10)

A vulcanizing bladder that vulcanizes and presses the unvulcanized tire against a vulcanization mold located outside by inflating in the lumen of the unvulcanized tire,
A first bladder in contact with an inner peripheral surface of the unvulcanized tire, and a second bladder disposed on the inner side of the first bladder,
The second bladder includes an upper portion located above when inflated in the first bladder and a lower portion located below.
At least a part of the lower part is a vulcanizing bladder formed by a thin part having a small thickness. The upper portion has a substantially constant thickness;
The vulcanization bladder according to claim 1, wherein a difference between the thickness of the upper portion and the thickness of the thin portion is 1 mm or more.   The vulcanization bladder according to claim 1 or 2, wherein the thin portion has a thickness of 1 mm or more.   The vulcanization bladder according to claim 1, wherein the first bladder has a substantially constant thickness.   The vulcanization bladder according to any one of claims 1 to 4, wherein a surface area of the thin portion is 20% to 60% of a surface area of the lower portion.   A vulcanizing apparatus comprising the vulcanizing bladder according to any one of claims 1 to 5, the vulcanization mold, and a supply means for supplying a heating fluid into the vulcanizing bladder. A method for vulcanizing the unvulcanized tire using the vulcanizing bladder according to claim 1,
A first inflating step of inflating the first bladder within the lumen of the unvulcanized tire;
After the first expansion step, a closing step for closing the addition mold,
A vulcanization method including a second expansion step of expanding the second bladder after the closing step. The first expansion step includes a first supply step of supplying a first fluid into the first bladder;
The vulcanization method according to claim 7, wherein the second expansion step includes a first discharge step of discharging the first fluid in the first bladder.   The second expansion step includes a second supply step for supplying a second fluid into the second bladder, and a third supply step for supplying a third fluid into the second bladder after the second supply step. The vulcanization method according to claim 7 or 8, comprising:   The said 2nd bladder is contact | abutted to the internal peripheral surface of the said 1st bladder in the said 2nd expansion | swelling process, The said unvulcanized tire is pressed on the said vulcanization metal mold | die. Vulcanization method.

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