JP2007331295A - Manufacturing method of pneumatic tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily enhance the productivity of a pneumatic tire 1 by shortening the time required in the attaching work of an attaching patch 33. <P>SOLUTION: A cover 43 is pasted on a part of the inner surface of the inner linear 23 of a green tire 1' so as to cover the same, the inner surface of the inner liner 23 of the green tire 1' is coated with a mold release agent, the green tire 1' is vulcanized while pressurizing the green tire 1' from the inside by a bladder 47 to mold the green tire 1' into a predetermined product shape and the cover 43 is detached from a part of the inner surface of the inner liner 23 to attach the attaching patch 33 to a part of the inner surface of the inner liner 23 by an adhesive. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pneumatic tire manufacturing method for manufacturing, from a raw tire, a pneumatic tire in which a mounting patch used for mounting a sensor unit such as a transponder is mounted on a part of an inner surface of an inner liner.

  In recent years, sensor units such as transponders are often mounted on the inner liner side of pneumatic tires, and mounting patches are used for mounting the sensor units. The attachment patch is attached to a part of the inner surface of the inner liner as follows.

  In other words, with a mounting patch attached to a part of the inner surface of the inner liner of a raw tire (unvulcanized tire before it is completed as a pneumatic tire), the raw tire is pressurized from the inside while being pressurized by a bladder. By vulcanizing the raw tire in a mold, the mounting patch is attached to a part of the inner surface of the inner liner by vulcanization adhesion while forming the raw tire into a predetermined product shape (during vulcanization of the raw tire) When installing a mounting patch). Alternatively, after the raw tire is vulcanized, a mounting patch is attached to a part of the inner surface of the inner liner of the pneumatic tire by an adhesive (when the mounting patch is attached after the raw tire is vulcanized).

In addition, there exists a thing shown to patent document 1 and patent document 2 as a prior art relevant to this invention.
JP 2000-168321 A JP-A-9-136517

  By the way, when attaching the mounting patch during vulcanization of the raw tire, during vulcanization of the raw tire, the pressure from the bladder works locally around the mounting patch, and the mounting patch is applied to the inner surface of the inner liner. I will be absorbed. Therefore, after the vulcanization of the raw tire, the local deformation remains on the belt in the pneumatic tire, and the original tire performance of the pneumatic tire, in particular, the uneven wear resistance performance cannot be fully exhibited. There is.

  On the other hand, when the mounting patch is attached after the raw tire is vulcanized, the above-described problem does not occur, but there is the following problem. That is, in order to prevent adhesion between the bladder and the inner surface of the inner liner, a release agent is applied to the inner surface of the inner liner in the raw tire in advance before vulcanizing the raw tire, and the raw tire is vulcanized. Later, the powder release agent will remain on the inner surface of the inner liner. Therefore, before attaching the mounting patch to a part of the inner surface of the inner liner, a part of the inner surface of the inner liner must be buffed to remove the powder release agent adhering to a part of the inner surface of the inner liner. There is a problem that it is difficult to increase the productivity of the pneumatic tire because the time required for the mounting operation of the mounting patch, in other words, the time required for manufacturing the pneumatic tire provided with the mounting patch becomes long. .

  Therefore, in order to solve the above-mentioned problem, the present invention has a constitutional requirement that a mounting patch is attached to a part of the inner surface of the inner liner after vulcanization of the raw tire, while the powder release agent is added to the raw tire. It is an object of the present invention to provide a method for manufacturing a pneumatic tire having a novel configuration that can sufficiently suppress remaining on a part of the inner surface of an inner liner after vulcanization.

  A first feature of the present invention (a feature of the invention described in claim 1) is that a pneumatic tire in which a mounting patch used for mounting a sensor unit is mounted on a part of the inner surface of an inner liner is manufactured from a raw tire. In the manufacturing method of the pneumatic tire for carrying out, in the raw tire, after the cover sticking step for covering the cover on the part of the inner surface of the inner liner in the raw tire and the cover sticking step are finished After the release agent application step for applying the release agent to the inner surface of the inner liner and the release agent application step are completed, the raw tire is vulcanized while being pressurized from the inside by a bladder. Thus, after the vulcanization step for molding the green tire into a predetermined product shape and the release agent coating step, the cover is moved forward. Cover removing step for removing from the part of the inner surface of the inner liner, and patch attaching step for attaching the attachment patch to the part of the inner surface of the inner liner with an adhesive after the vulcanizing step and the cover removing step are completed. And having provided.

  Here, as long as the said cover removal process is after the completion | finish of the said mold release agent application | coating process, you may start before the start of the said vulcanization process, or after completion | finish.

  According to the first feature, before applying a release agent to the inner surface of the inner liner in the green tire, the cover is attached to the part of the inner surface of the inner liner in the green tire so as to cover the cover. Therefore, the mold release agent is not applied to the part of the inner surface of the inner liner in the green tire, and the powder release agent is vulcanized after the raw tire is vulcanized. Can be sufficiently suppressed.

  The second feature of the present invention (the feature of the invention described in claim 2) is that, in addition to the first feature, the cover removing step is started after the end of the vulcanizing step, The said cover is comprised with the material which has a heat-resistant temperature higher than the vulcanization temperature of the said raw tire.

  According to the second feature, since the cover removing step is started after the vulcanizing step is completed, in other words, the cover is attached to the inner surface of the inner liner after the raw tire is vulcanized. Since the part is removed from the part, the parting agent remaining on the surface of the bladder before the start of the parting agent application process does not adhere to the part of the inner surface of the inner liner in the green tire. The powdery mold release agent does not remain on the part of the inner surface of the inner liner after vulcanization of the green tire.

  The third feature of the present invention (the feature of the invention described in claim 3) is that, in addition to the first feature or the second feature, the surface roughness of the cover on the pasting side is the inner liner in the green tire. The surface roughness is larger.

  According to the third feature, the surface roughness of the cover on the side to which the cover is attached is larger than the surface roughness of the inner liner in the green tire. The surface roughness of the portion of the inner surface can be locally increased.

  According to a fourth feature of the present invention (a feature of the invention described in claim 4), in addition to any one of the first feature to the third feature, the cover removing step is completed, And a sensor unit attachment step of attaching the sensor unit to the attachment patch.

  According to the invention of any one of claims 1 to 4, a powder-like mold release agent remains on the part of the inner surface of the inner liner after vulcanization of the green tire. Therefore, the attachment patch can be attached to the part of the inner surface of the inner liner with an adhesive without buffing a part of the inner surface of the inner liner. Therefore, the time required for the mounting work of the mounting patch, in other words, the manufacturing work of the pneumatic tire provided with the mounting patch can be shortened, and the productivity of the pneumatic tire can be easily increased.

  First, the structure of the pneumatic tire according to the embodiment of the present invention will be described with reference to FIGS. 4 and 5A and 5B.

  Here, FIG. 4 is a partial cross-sectional view of the pneumatic tire according to the embodiment of the present invention, FIG. 5A is a view showing the periphery of the mounting patch, and FIG. 5B is FIG. 5A. It is the figure seen from the top.

  As shown in FIG. 4, the pneumatic tire 1 according to the embodiment of the present invention includes a pair of bead portions 5 that can be fitted to the rim 3, and each bead portion 5 includes a bead core 7 and the bead core. 7 and a bead wheeler 9 disposed outside the tire radial direction R. Further, one end portion of the toroidal carcass 11 is connected to the bead core 7 in one bead portion 5 so as to be folded back from the inner side to the outer side in the tire width direction W, and the bead core 7 in the other bead portion 5 is The other end of the carcass 11 is connected so as to be folded back from the inside in the tire width direction W. Here, the carcass 11 has a plurality of steel cords (not shown) extending in the radial direction.

  In the crown region of the carcass 11, for example, a two-layer belt 13 is provided. The belt 13 exhibits a so-called effect, and a number of steels extending in a direction inclined in the tire circumferential direction C. The cord 15 is covered with rubber. A tread portion 17 is provided on the outer peripheral surface of the belt 13, and a plurality of circumferential main grooves 19 extending in the tire circumferential direction C are formed in the tread portion 17. Further, sidewall portions 21 are provided between the tread portion 17 on one side surface of the carcass 11 and the one bead portion 5 and between the tread portion 17 and the other bead portion 5 on the other side surface of the carcass 11, respectively. Yes. Furthermore, an inner liner 23 is provided on the inner surface of the carcass 11 to prevent air leakage.

  As shown in FIGS. 4 and 5A and 5B, a transponder 25 is attached to the inner surface of the inner liner 23. The transponder 25 is one of the sensor units and has a tire internal pressure. It is used to measure the etc. The transponder 25 includes a box-type transponder body 27 as a sensor unit body. The transponder body 27 includes a plurality of electronic components (not shown) such as an IC, a capacitor, and a resistor. Further, the transponder body 27 is provided with an engagement pin 29, and a button 31 larger than the diameter of the engagement pin 29 is provided on the distal end side of the engagement pin 29.

  A mounting patch 33 is provided on a part of the inner surface of the inner liner 23. The mounting patch 33 is used when the transponder 25 is mounted and is made of a rubber material. Further, the attachment patch 33 includes a pair of patch adhesive portions 35 that are adhered to a part of the inner surface of the inner liner 23 by an adhesive (for example, a cyanoacrylate adhesive or a chloroprene adhesive). A patch wall portion 37 that regulates movement of the transponder 25 in the tire circumferential direction C is integrally formed with the portion 35. The pair of patch walls 37 are integrally formed so as to span a patch connecting portion 39 that holds the transponder 25, and the patch connecting portion 39 is engaged with an engagement pin 29. A hole 41 is formed.

  Then, the manufacturing method of the pneumatic tire which concerns on embodiment of this invention is demonstrated with reference to FIGS. 1-3.

  Here, FIG. 1 (a) is a figure explaining the cover sticking process in the manufacturing method of the pneumatic tire which concerns on embodiment of this invention, FIG.1 (b) is a figure explaining a mold release agent application | coating process, FIG. 2 (a) is a diagram illustrating the vulcanization process, FIG. 2 (b) is a diagram illustrating the cover removal process, FIG. 3 (a) is a diagram illustrating the vulcanization process, and FIG. 3 (b) is a diagram illustrating the vulcanization process. It is a figure explaining a cover removal process.

  The manufacturing method of the pneumatic tire according to the embodiment of the present invention is a manufacturing method of manufacturing the pneumatic tire 1 in which the mounting patch 33 is attached to a part of the inner surface of the inner liner 23 from the raw tire 1 ′. It includes a cover sticking step, a release agent applying step, a vulcanizing step, a cover removing step, a patch attaching step, and a sensor unit attaching step (transponder attaching step). The raw tire 1 ′ refers to an unvulcanized tire before being completed as the pneumatic tire 1.

Cover Affixing Step As shown in FIG. 1 (a), a raw tire 1 is formed using a sheet-like cover 43 made of regenerated cellulose (an example of a material having a heat resistance higher than the vulcanization temperature of the raw tire 1 '). The cover 43 is pasted on a part of the inner surface of the inner liner 23 in FIG.

  Here, the surface roughness on the attachment side of the cover 43 is larger than the surface roughness of the inner liner 23 in the green tire 1 ′, and specifically, the surface roughness Ra is 2 μm or more. The cover 43 may be made of another material (for example, cellulose, PET fiber, metal) having a heat resistance higher than the vulcanization temperature of the raw tire 1 instead of the regenerated cellulose.

Release agent coating process After the cover pasting process is completed, as shown in FIG. 1 (b), for example, a known release agent coating apparatus described in Japanese Patent Application Laid-Open No. 2000-88430 is used. A release agent is sprayed from the nozzle 45 in the above toward the inner surface of the inner liner 23 in the green tire 1 ′. Thereby, a mold release agent is apply | coated to the inner surface of the inner liner 23 in raw tire 1 '. In the drawing, point hatching is applied to the portion where the release agent is applied.

Vulcanization Step After the release agent coating step is completed, the raw tire 1 ′ is vulcanized in the vulcanizing mold 49 while the raw tire 1 ′ is pressurized from the inside by a bladder 47 as shown in FIG. By vulcanizing, the raw tire 1 'is formed into a predetermined product shape.

  Here, the vulcanizing mold 49 is provided on a fixed frame (not shown) in the vulcanizing apparatus, and an annular lower mold 51 capable of mainly molding one sidewall portion 21 and one bead portion 5; An upper mold 53 provided on an elevating frame (not shown) that can be raised and lowered in the apparatus and capable of mainly molding the other sidewall portion 21 and the other bead portion 5, and provided on the lower mold 51 and mainly molded the tread portion 17. And a possible annular sector mold 55.

Cover Removal Step After the vulcanization step is completed, the cover 43 is removed from a part of the inner surface of the inner liner 23 as shown in FIG.

  Note that the cover removal step may be started before the start of the vulcanization step as long as it is after the release agent coating step.

Patch attachment process After the cover removal process is completed, an adhesive (for example, a cyanoacrylate adhesive or a chloroprene adhesive) is applied to at least one of a part of the inner surface of the inner liner 23 or the back surfaces of the pair of patch adhesive portions 35. Apply. Then, as shown in FIG. 3A, by placing a pair of patch adhesive portions 35 on a part of the inner surface of the inner liner 23, the attachment patch 33 is attached to a part of the inner surface of the inner liner 23 with an adhesive.

Sensor unit installation process (transponder installation process)
After the patch attaching step is completed, as shown in FIG. 3B, the transponder 25 is inserted between the pair of patch wall portions 37, and the engaging pin 29 is engaged with the patch connecting portion 39 from the button 31 side. Engage with the hole 41. As a result, the transponder 25 is attached to the attachment patch 33.

  Thus, the manufacture of the pneumatic tire 1 provided with the mounting patch 33 is completed.

  Next, the operation and effect of the embodiment of the present invention will be described.

  Before applying the release agent to the inner surface of the inner liner 23 in the raw tire 1 ′, it is pasted on a part of the inner surface of the inner liner 23 in the raw tire 1 ′ so as to cover the cover 43. Since the cover 43 is removed from a part of the inner surface of the inner liner 23 after vulcanization, the release agent is applied to a part of the inner surface of the inner liner 23 in the raw tire 1 ′, or before the start of the release agent application process. The mold release agent remaining on the surface of the bladder 47 does not adhere to a part of the inner surface of the inner liner 23 in the green tire 1 ′, and the powder mold release agent is not cured after vulcanization of the green tire 1 ′. It does not remain on a part of the inner surface of the inner liner 23.

  Further, since the surface roughness of the cover 43 on the pasting side is larger than the surface roughness of the inner liner 23 in the raw tire 1 ′, the cover 43 causes the inner surface of the inner liner 23 to be covered by the cover 43 during vulcanization of the raw tire 1 ′. The surface roughness of a part can be locally increased.

  As described above, according to the embodiment of the present invention, the powder release agent does not remain on a part of the inner surface of the inner liner 23 after vulcanization of the green tire 1 ′. The attachment patch 33 can be attached to a part of the inner surface of the inner liner 23 with an adhesive without buffing a part thereof. Therefore, the time required for the mounting work of the mounting patch 33, in other words, the manufacturing work of the pneumatic tire 1 including the mounting patch 33 can be shortened, and the productivity of the pneumatic tire 1 can be easily increased.

  Further, since the surface roughness of a part of the inner surface of the inner liner 23 can be locally increased by the cover 43 during the vulcanization of the raw tire 1 ′, the bonding area of the mounting patch 33 is increased and the mounting patch is increased. The adhesive strength of 33 can be increased.

  Note that the present invention is not limited to the description of the above-described embodiment, and can be implemented in various other forms such as omitting the patch wall portion 37 and / or the patch connecting portion 39 from the attachment patch 33, for example. is there. Further, the scope of rights encompassed by the present invention is not limited to these embodiments.

Fig.1 (a) is a figure explaining the cover sticking process in the manufacturing method of the pneumatic tire which concerns on embodiment of this invention, FIG.1 (b) is a figure explaining a mold release agent application | coating process. FIG. 2A is a diagram illustrating a vulcanization process in the method for manufacturing a pneumatic tire according to the embodiment of the present invention, and FIG. 2B is a diagram illustrating a cover removing process. FIG. 3A is a diagram illustrating a vulcanization process in the method for manufacturing a pneumatic tire according to the embodiment of the present invention, and FIG. 3B is a diagram illustrating a cover removing process. 1 is a partial cross-sectional view of a pneumatic tire according to an embodiment of the present invention. Fig.5 (a) is a figure which shows the periphery of an attachment patch, FIG.5 (b) is the figure which looked at Fig.5 (a) from the top.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tire 1 'Raw tire 23 Inner liner 25 Transponder 27 Transponder main body 29 Engagement pin 31 Button 33 Attachment patch 35 Patch adhesion part 37 Patch wall part 39 Patch connection part 41 Engagement hole 43 Cover 45 Nozzle 47 Bladder 49 Vulcanization mold

Claims (4)

In the manufacturing method of a pneumatic tire for manufacturing a pneumatic tire in which a mounting patch used for mounting the sensor unit is mounted on a part of the inner surface of the inner liner from a raw tire,
A cover attaching step for attaching the cover to the part of the inner surface of the inner liner in the raw tire; and
After the cover pasting step is completed, a release agent application step of applying a release agent to the inner surface of the inner liner in the green tire,
After the release agent application step is completed, a vulcanization step of molding the raw tire into a predetermined product shape by vulcanizing the raw tire while pressing the raw tire from the inside with a bladder;
A cover removal step of removing the cover from the part of the inner surface of the inner liner after the release agent application step is completed;
A patch attaching step for attaching the attachment patch to the part of the inner surface of the inner liner after the vulcanizing step and the cover removing step are completed;
A method for producing a pneumatic tire, comprising:   The cover removing process is started after the vulcanizing process is completed, and the cover is made of a material having a heat resistant temperature higher than the vulcanizing temperature of the green tire. The manufacturing method of the pneumatic tire of Claim 1.   3. The method for manufacturing a pneumatic tire according to claim 1, wherein the surface roughness of the cover on the pasting side is larger than the surface roughness of the inner liner in the green tire. 4. After the cover removal step is completed, a sensor unit attachment step of attaching the sensor unit to the attachment patch,
The method for manufacturing a pneumatic tire according to any one of claims 1 to 3, characterized by comprising:

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