JP6259275B2 - Method for attaching member to tire inner surface and tire manufacturing method - Google Patents

Description

  The present invention relates to a method for attaching a member to an inner surface of a tire for attaching a member to the inner surface of a tire, and a tire manufacturing method for manufacturing a pneumatic tire in which a member is attached to the inner surface of a tire.

  Conventionally, in order to improve the performance of a pneumatic tire, it has been proposed to attach devices having various functions to the inner surface of the pneumatic tire, such as a member such as a sound absorbing material.

  In general, when manufacturing a pneumatic tire, after molding the green tire, a rubber bladder is inserted inside the green tire, and the bladder is inflated by filling the bladder with high-temperature and high-pressure gas. The tire is pressed against the mold and vulcanized. After vulcanization, the bladder is shrunk and the vulcanized tire is removed from the mold to complete the tire. In this vulcanization molding, in order to prevent adhesion between the tire inner surface and the bladder, it is common to coat a release agent on the bladder surface.

  Therefore, the release agent is still applied to the tire inner surface after vulcanization molding. Therefore, when a member is attached to the inner surface of the tire using an adhesive or an adhesive tape, it is necessary to remove the release agent that inhibits the attachment from the inner surface of the tire.

  In Patent Document 1 described below, when a band-like sheet for damping is attached to the tire inner surface using a synthetic rubber adhesive, the tire inner surface is buffed to remove the release agent. Further, in Patent Document 2 below, when a band-like sponge agent for noise suppression is applied to the inner surface of the tire, the inner liner layer on the inner surface of the tire is buffed to remove the release agent. Similarly, in Patent Document 3 below, when a member is attached to the tire inner surface, the mold release agent is removed by buffing the tire inner surface.

  In Patent Documents 1 to 3, the release agent is removed by buffing. However, if the buffing is insufficient, the releasing agent remains on the tire inner surface and adhesion cannot be ensured. If it is excessive, the tire inner surface may be roughened and the adhesion may be impaired. However, Patent Documents 1 to 3 do not sufficiently study the degree of buff processing.

JP 2003-63208 A JP 2007-152789 A JP 2010-260186 A

  Accordingly, an object of the present invention is to provide a method for attaching a member to a tire inner surface and a method for manufacturing a tire that can reliably adhere the member to the inner surface of the tire.

The above object can be achieved by the present invention as described below.
That is, the method of attaching a member to the tire inner surface of the present invention is a method of attaching a member to the tire inner surface, wherein the member is attached to the tire inner surface.
A mold release agent removing step for removing the mold release agent applied to the affixing region to which the member is pasted out of the tire inner surface after vulcanization molding;
A smoothing step of setting the surface roughness of the pasting region to 30 μm or less;
A pasting step of pasting the member onto the smoothed pasting region using an adhesive tape.

  The method for attaching a member to the inner surface of a tire according to the present invention is used when manufacturing a pneumatic tire in which a member is attached to an inner surface of a tire after vulcanization molding using an adhesive tape. Since the inner surface of the tire after vulcanization remains in a state where the release agent is applied, the adhesive property of the adhesive tape is impaired by the release agent, and the member cannot be firmly attached to the inner surface of the tire. . Therefore, the mold release agent applied to the pasting region to which at least the member is pasted is removed from the tire inner surface after vulcanization molding. Further, the surface roughness of the pasting area is set to 30 μm or less. By adjusting the surface roughness within this range while removing the release agent in the affixing region, the adhesiveness of the adhesive tape can be improved, so that the member can be reliably affixed to the tire inner surface. In addition, the surface roughness of this invention is arithmetic mean roughness Ra.

  In the method for attaching a member to the inner surface of a tire according to the present invention, it is preferable that the releasing agent removing step and the smoothing step are simultaneously performed by buffing the attaching region. According to this configuration, the release agent removing step and the smoothing step can be easily performed in a short time, and the member can be reliably adhered to the tire inner surface.

The above object can be achieved by the present invention as described below.
That is, the tire manufacturing method of the present invention is a tire manufacturing method for manufacturing a pneumatic tire in which a member is attached to the tire inner surface.
A mold release agent removing step for removing the mold release agent applied to the affixing region to which the member is pasted out of the tire inner surface after vulcanization molding;
A smoothing step of setting the surface roughness of the pasting region to 30 μm or less;
A pasting step of pasting the member onto the smoothed pasting region using an adhesive tape.

  The tire manufacturing method of this invention is for manufacturing the pneumatic tire which affixed the member on the tire inner surface using the adhesive tape. Since the inner surface of the tire after vulcanization remains in a state where the release agent is applied, the adhesive property of the adhesive tape is impaired by the release agent, and the member cannot be firmly attached to the inner surface of the tire. . Therefore, the mold release agent applied to the pasting region to which at least the member is pasted is removed from the tire inner surface after vulcanization molding. Further, the surface roughness of the pasting area is set to 30 μm or less. By adjusting the surface roughness within this range while removing the release agent in the affixing region, the adhesiveness of the adhesive tape can be improved, so that the member can be reliably affixed to the tire inner surface. In addition, the surface roughness of this invention is arithmetic mean roughness Ra.

Tire meridian cross-sectional view showing an example of pneumatic tire Explanatory drawing which showed the manufacturing process of a pneumatic tire typically

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the configuration of a pneumatic tire having a member attached to the inner surface of the tire will be described. FIG. 1 is a tire meridian cross-sectional view showing an example of a pneumatic tire. In the present embodiment, a sound absorbing material fixture for attaching a porous sound absorbing material is exemplified as a member to be attached to the tire inner surface, but there are various methods for attaching a member to the tire inner surface and tire manufacturing methods of the present invention. This can be applied when a member is attached to the tire inner surface.

  In the pneumatic tire 1 shown in FIG. 1, a rod-shaped porous sound absorbing material 2 extending along the tire width direction WD is attached to a tire inner surface 10. It is preferable that a plurality of the porous sound absorbing materials 2 are provided at intervals in the tire circumferential direction with respect to the tire inner surface 10. For example, it is preferable to arrange four porous sound absorbing materials 2 at equal intervals in the tire circumferential direction.

  The porous sound absorbing material 2 is not particularly limited, but a sponge made of a flexible polyurethane foam is preferably used. In addition, the shape of the porous sound absorbing material 2 is not particularly limited as long as it is a rod shape, but a cylindrical shape is preferable. When the porous sound-absorbing material 2 is cylindrical, an air layer is formed inside, so that the effect of absorbing sound passing through the porous sound-absorbing material 2 is high. Furthermore, the shape of the porous sound absorbing material 2 is particularly preferably cylindrical. When the porous sound-absorbing material 2 is cylindrical, a sound-absorbing effect can be exhibited for sounds from all angles.

  The porous sound absorbing material 2 is attached to the tire inner surface 10 via the sound absorbing material attachment 3. The sound absorbing material fixture 3 is fixed to the tire inner surface 10. The sound absorbing material fitting 3 has a cylindrical shape, and the porous sound absorbing material 2 is inserted therein. The sound absorbing material fixture 3 includes an attachment base portion 31 for fixing to the tire inner surface 10.

  The attachment base portion 31 has a substantially circular plate shape and is integrated with the sound absorbing material attachment 3. The shape of the mounting base portion 31 is not particularly limited, but an elliptical shape is preferable for weight reduction and secure fixing. When the mounting base portion 31 has an elliptical plate shape, the mounting base portion 31 is fixed to the tire inner surface 10 such that the major axis direction of the ellipse is the tire circumferential direction and the minor axis direction is the tire width direction WD.

  The attachment base portion 31 is bonded to the tire inner peripheral surface 10 via the adhesive tape 4. The pressure-sensitive adhesive tape 4 is composed of a cushion layer body 41 having stretchability and adhesive layers 42 and 43 on both sides of the cushion layer body 41. As a result, the cushion layer body 41 in the adhesive tape 4 is deformed and adhered following the unevenness or curved surface shape of the tire inner surface 10, so that the mounting base portion 31 can be stably fixed to the tire inner surface 10. it can.

  Next, a method for attaching a member to the tire inner surface and a tire manufacturing method will be described. The method for affixing a member to the tire inner surface according to the present invention is a method for affixing a member to a tire inner surface in which the member is affixed to the tire inner surface. A release agent removing step for removing the release agent that has been applied, a smoothing step for reducing the surface roughness of the pasting region to 30 μm or less, and a pasting step for pasting a member to the smoothed pasting region using an adhesive tape Are provided. Moreover, the tire manufacturing method concerning this invention is apply | coated to the sticking area | region which pastes a member among the tire inner surfaces after vulcanization molding in the tire manufacturing method which manufactures the pneumatic tire which stuck the member on the tire inner surface. A release agent removing step for removing the release agent, a smoothing step for reducing the surface roughness of the application region to 30 μm or less, and an attachment step for attaching a member to the smoothed application region using an adhesive tape. It is to be prepared.

  FIG. 2 is an explanatory view schematically showing a manufacturing process of the pneumatic tire 1. As shown in FIG. 2 (a), the tire inner surface 10 after vulcanization molding is still in a state where the release agent 5 is applied, so that the member is to be pasted using the adhesive tape 4 as it is. However, the adhesive property of the pressure-sensitive adhesive tape 4 is impaired by the release agent 5, and the member cannot be firmly attached to the tire inner surface 10.

  Therefore, as shown in FIG. 2 (b), a buffing process is performed on the pasting region 10 a to which the member is pasted, of the tire inner surface 10 using the buff 6. Thereby, as shown in FIG.2 (c), the release agent 5 apply | coated to the sticking area | region 10a is removed (release agent removal process). For buffing, a sponge such as urethane, wool or non-woven buff 6 is used. Sandpaper or a grindstone-shaped buff is excessively buffed, and the sticking region 10a of the tire inner surface 10 is roughened to impair adhesion.

  The surface roughness Ra of the pasting area 10a after the buffing process is set to 30 μm or less (smoothing process). That is, in the present embodiment, the release agent removing step and the smoothing step are simultaneously performed by buffing. Preferably, the surface roughness Ra is 10 μm or less. When the surface roughness Ra exceeds 30 μm, the adhesion by the pressure-sensitive adhesive tape 4 is hindered, so that the durability of adhesion is poor.

  In addition, the tire inner surface 10 of the pneumatic tire 1 of the present embodiment has a bladder group 11 generated during vulcanization molding. However, in the present invention, it is not necessary to eliminate the bladder group 11 by buffing, and the bladder Buffing is performed to such an extent that the group 11 does not disappear, and the surface roughness Ra of the tire surface including the upper and side surfaces of the bladder group 11 may be set to 30 μm. The uneven shape of the tire inner surface 10 caused by the bladder group 11 does not cause a problem when a member is attached because the cushion layer body 41 in the above-described adhesive tape 4 can be deformed following the uneven shape.

  Finally, as shown in FIG. 2 (d), the release agent 5 is removed by buffing, and a member (in this example, a sound absorbing material fixture) is applied to the pasting region 10a having a surface roughness Ra of 30 μm. 3) is pasted (pasting step). As described above, the pneumatic tire 1 in which a member is attached to the tire inner surface 10 can be manufactured.

[Other Embodiments]
(1) In the above-described embodiment, the release agent removing step and the smoothing step are simultaneously performed by buffing, but the release agent removing step and the smoothing step may be performed separately. In this case, for example, after performing the release agent removing step by buffing using the first buff, the smoothing step is performed by buffing using the second buff.

  (2) Moreover, a mold release agent removal process and a smoothing process may be performed by brushing using a brush. For the brushing treatment, a brush made of resin such as nylon, polypropylene, or polyester, or a vegetable or animal brush is used. If metal brushes or abrasive grains are used, there is a possibility of excessive grinding, which may damage the inner liner of the tire inner surface 10 and cause a failure of the tire itself.

  (3) Furthermore, you may perform a mold release agent removal process and a smoothing process by wiping off a mold release agent using surfactant or an organic solvent (toluene etc.).

  Examples and the like specifically showing the configuration and effects of the present invention will be described below. In addition, the evaluation item in an Example etc. measured as follows.

(1) Adhesive strength A resin plate is affixed to the inner surface of the tire to be attached using adhesive tape, and after sufficient curing, vertical peeling is performed, and the maximum load at that time is taken as the adhesive strength. The strength was examined. The result of Comparative Example 1 is shown as an index with the value of 100, and the larger the value, the greater the adhesive strength.

(2) Durability of adhesion The durability of adhesion was examined for a pneumatic tire having a member attached to the inner surface of the tire. The durability of the adhesion was examined by running a pneumatic tire with a member attached to the inner surface of the tire using a drum and setting the target travel distance to 100,000 km. The evaluation is “○”, “×”, “○” indicates that the member was stuck without any abnormality even after running 100,000 km, and “×” confirmed that there was an abnormality in pasting before running 100,000 km. Indicates that

  Pneumatic tires with members attached to the tire inner surface under the conditions shown in Table 1 were produced, and the above performance was evaluated. In the pneumatic tire of Comparative Example 1, the release agent was removed from the tire inner surface by buffing, but the surface roughness of the pasting region exceeded 30 μm. In the pneumatic tire of Comparative Example 2, the members are directly attached to the inner surface of the tire after vulcanization molding. The pneumatic tire of Example 1 wipes and removes the release agent from the tire inner surface using an organic solvent, so that the surface roughness of the pasting area is 10 μm or less (the inner surface of the tire is almost the same according to the organic solvent). It is smoothed by melting the rubber surface without being roughed). In the pneumatic tire of Example 2, the release agent is removed from the tire inner surface by buffing, and the surface roughness of the pasting region is set to 30 μm or less. In the pneumatic tire of Example 3, the release agent is removed from the tire inner surface by buffing, and the surface roughness of the pasting region is 10 μm or less. The evaluation results of adhesive strength and adhesion durability are also shown in Table 1.

  From the results in Table 1, the following can be understood. The pneumatic tires of Examples 1 to 3 had higher adhesion strength and improved adhesion durability as compared with Comparative Example 2. In Comparative Example 1, the adhesive strength was higher than that in Comparative Example 2, but the durability of the adhesion remained insufficient.

DESCRIPTION OF SYMBOLS 1 Pneumatic tire 3 Sound absorption material fixture 4 Adhesive tape 5 Mold release agent 10 Tire inner surface 10a Pasting area

Claims (3)

In the method of attaching the member to the tire inner surface, the member is attached to the inner surface of the tire where the bladder groove is formed during vulcanization molding ,
A mold release agent removing step for removing the mold release agent applied to the affixing region to which the member is affixed on the tire inner surface after vulcanization molding without losing the bladder groove ,
A smoothing step of setting the surface roughness of the tire inner surface including the upper surface and side surfaces of the bladder groove in the pasting region to 30 μm or less;
Affixing step of affixing the member using an adhesive tape on the smoothed affixing region ,
The adhesive tape includes a cushion layer body having elasticity, method of attaching a member for the tire inner surface, characterized that you have been configured by the adhesive layer on both sides of the cushion layer body.   The method for attaching a member to the tire inner surface according to claim 1, wherein the releasing agent removing step and the smoothing step are performed simultaneously by buffing the attaching region. In the tire manufacturing method for manufacturing a pneumatic tire in which a member is attached to the tire inner surface in which a bladder groove is formed during vulcanization molding,
A mold release agent removing step for removing the mold release agent applied to the affixing region to which the member is affixed on the tire inner surface after vulcanization molding without losing the bladder groove ,
A smoothing step of setting the surface roughness of the tire inner surface including the upper surface and side surfaces of the bladder groove in the pasting region to 30 μm or less;
Affixing step of affixing the member using an adhesive tape on the smoothed affixing region ,
The adhesive tape, the tire manufacturing method of a cushion layer body having elasticity, characterized that you have been configured by the adhesive layer on both sides of the cushion layer body.

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