WO2002085649A1 - Self-seal tire and method of manufacturing the tire - Google Patents

Abstract

A self-seal tire, comprising a puncture seal layer installed through the entire inner wall surface of a pneumatic tire ranging from one shoulder part to the other shoulder part thereof, wherein the puncture seal layer is formed by installing an adhesive layer formed of an adhesive material adhered to the inner wall surface of the tire on the outer peripheral surface of an annular sponge layer soaked with the adhesive material so as to be exposed to the outer peripheral surface side of the tire, and the relation between the outer peripheral length (Ls) of the sponge layer before installation of the puncture seal layer thereon and the tire outer peripheral length (Lt) of the pneumatic tire at a centerline is set to 1.1 Lt ≤ Ls ≤ 1.3 Lt.

Description

 Meitoda: Self-sealing tire and its manufacturing method

 The present invention relates to a self-sealing device having a self-sealing function that does not leak air in a tire by closing a punctured hole when a nail is punctured by a nail or the like penetrating into a crown portion during running of a vehicle and the tire is punctured. And a method of manufacturing the same.

 Background technology

 With the spread of expressways, the demand for tires having a self-sealing function is increasing day by day, and various self-sealing tires having a puncture seal layer have been proposed.

 Conventionally, for example, there has been proposed a self-sealing tire in which a puncture layer is formed by applying a high-viscosity adhesive as a sealant to an inner surface of a tire crown portion.

 However, this type of tire has a problem that when the tire rotates at a high speed, the adhesive flows toward the center of the crown portion due to centrifugal force, so that it cannot cope with blocking of a puncture hole near a part of the shoulder.

Japanese Patent Application Laid-Open No. 54-62006 discloses that a puncture layer is formed by attaching a sponge layer impregnated with the same adhesive material as described above to the inner surface of a tire crown. A self-sealing tire has been proposed. In this tire, after a sponge layer is mounted on the inner surface of the tire, a puncture seal layer is formed by impregnating the inside of the sponge layer with a pressure roller from the surface of the sponge layer while rotating the tire. . Therefore, in order to sufficiently impregnate the adhesive material into the sponge layer so as to reach the inner surface of the tire, it is necessary to apply a high pressing force while tying the adhesive at a low rotation speed. It is necessary to rotate the key. As a result, there was a problem that the work of impregnating the adhesive took time and the workability was poor.

 In addition, since the adhesive is exposed on the surface of the sponge layer, dust and foreign matters adhere to the surface during transportation and storage, and the appearance is deteriorated.In addition, the adhesive is applied to workers' hands and equipment during tire handling. There is difficulty in handling due to adhesion.

 Disclosure of the invention

 SUMMARY OF THE INVENTION An object of the present invention is to provide a self-sealing tire excellent in handling property, in which no adhesive material moves during running of a vehicle, workability during forming of a puncture seal layer is good, and appearance is not deteriorated, and its production. In providing a method.

 The self-sealing tire of the present invention that achieves the above object is a self-sealing tire in which a puncture layer is mounted on the entire inner wall surface of a tire from one shoulder part to the other shoulder part of a pneumatic tire. The puncture layer is formed by providing an adhesive layer made of an adhesive material adhered to the inner wall surface of the tire on the outer peripheral surface of an annular sponge layer impregnated with an adhesive material so as to be exposed on the outer peripheral surface side. 1.1 Lt≤Ls≤ 1.1 Lt≤Ls≤ The relationship between the tact circumference Ls of the sponge layer before the puncture seal layer is mounted and the tire circumference Lt in the center line of the pneumatic tire is 1.1 Lt≤Ls≤ It is characterized by 1.3 Lt.

The method for manufacturing a self-sealing tire according to the present invention is a method for manufacturing a self-sealing tire in which a puncture seal layer is mounted on the entire inner wall surface of a tire from one shoulder part to the other shoulder part of a pneumatic tire. By impregnating the pressure-sensitive adhesive material from the outer peripheral surface side of the annular sponge layer having an outer peripheral length Ls of 1.1 to 1.3 times the outer peripheral length Lt of the center line of the pneumatic tire, A viscous material that exposes the adhesive material on the outer peripheral surface side. A sponge layer impregnated with an adhesive is formed, an adhesive layer made of an adhesive is formed on the outer peripheral surface of the sponge layer impregnated with the adhesive, and a puncture layer is formed. Is bonded through the adhesive layer. Another method of manufacturing a self-sealing tire according to the present invention is a self-sealing tire having a puncture layer mounted on the entire inner wall surface of a pneumatic tire from a part of a shoulder to a part of the other shoulder. A method for manufacturing a tire, comprising: from the outer peripheral surface side of an annular sponge layer having an outer peripheral length Ls that is 1.1 to 1.3 times the outer peripheral length Lt of the tire at the center line of the pneumatic tire. An adhesive material is impregnated to form an adhesive material-impregnated sponge layer in which the adhesive material is exposed on the outer peripheral surface side, and at the same time, an adhesive layer made of the adhesive material is integrally formed on the outer peripheral surface of the adhesive material impregnation layer. Formed into 1

A tire layer is formed, and the adhesive layer is bonded to the inner wall surface of the tire via the adhesive layer.

 According to the above-described present invention, since the sponge layer is impregnated with the adhesive material that seals the puncture hole, the adhesive material is prevented from flowing toward the center of the crown due to the centrifugal force during vehicle running. be able to. Therefore, a puncture hole near the shoulder can be closed.

 In addition, since the adhesive is exposed on the outer peripheral surface of the sponge layer and impregnated so that the adhesive is not exposed on the inner peripheral surface, dust and foreign matter are deposited on the inner peripheral surface of the sponge layer during transportation or storage. Adhesion can be prevented. Therefore, the appearance does not deteriorate. Furthermore, since the adhesive does not adhere to the hands and devices of the worker when handling the tire, the handling of the tire becomes easy.

In addition, the sponge layer is impregnated with the adhesive material in advance, and by specifying the outer peripheral length Ls of the sponge layer within the above range, when the puncture seal layer is attached to the tire inner wall surface, the compressed sponge layer is Returns to its original size By doing so, the puncture seal layer can be pressed against the inner wall surface of the tire. Therefore, the puncture seal layer can be easily and firmly adhered to the inner wall surface of the tire without performing a pressing operation by applying a large pressing force from the outside with a pressing roller or the like. Therefore, workability can be improved.

 BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a tire meridian half sectional view showing an example of the self-sealing tire of the present invention.

 FIG. 2 is an enlarged sectional view of a portion indicated by an arrow A in FIG.

 FIG. 3 is a perspective view of an annular sponge layer before mounting a puncture seal layer.

 FIG. 4 is a schematic view showing a step of forming a puncture layer in the method for producing a self-sealing tire of the present invention.

 FIG. 5 is an enlarged sectional view of a main part showing another example of the puncture seal layer mounted on the self-sealing tire of the present invention.

 FIG. 6 is a schematic view showing a step of forming the puncture seal layer of FIG.

 BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same components are denoted by the same reference numerals, and redundant description will be omitted. In FIG. 1, a self-sealing tire of the present invention includes a pneumatic tire 1 and a puncture seal mounted over the entire surface of a tire inner wall surface 1X from one shoulder portion S to the other shoulder portion S of the pneumatic tire 1. And layers.

The pneumatic tire 1 has a crown P 11, left and right sidewall portions 12, and left and right bead portions 13. A car layer 14 is mounted between the left and right bead sections 13, and both ends 14 a are embedded in the bead section 13. The core is folded from inside to outside around the core 15. A plurality of belt layers 16 are provided on the outer peripheral side of the force / waste layer 14 of the crown portion 11.

 The puncture seal layer 2 is formed in an annular shape and, as shown in FIG. 2, is impregnated with a high-viscosity adhesive X as a seal material so as to be exposed on the outer peripheral surface side without being exposed on the inner peripheral surface side. The outer surface 3a of the sponge layer 3 is provided with an adhesive layer 4 made of an adhesive material that adheres to the tire inner wall surface 1X. The adhesive of the adhesive layer 4 is made of the same high-viscosity adhesive composition as the adhesive X impregnated in the sponge layer 3, and the adhesive layer 4 is integrally formed on the outer peripheral surface 3a of the sponge layer 3. .

 As shown in FIG. 3, the sponge layer 3 formed in an annular shape has an outer peripheral length Ls before the puncture layer is attached and a tire outer peripheral length Lt on the center line CL of the pneumatic tire 1. In the relation, the relation of 1. l L t ≤ L s ≤ 1.3 L t is satisfied.

 The self-sealing tire having the puncture seal layer 2 described above is manufactured as follows.

 As shown in FIG. 4, a pair of adhesive X discharged from the discharge port 6 of the adhesive extruder is applied to the outer peripheral surface 3a of the preformed annular sponge layer 3 rotated by the rollers 1 and 5. One round of pressure is applied successively by rollers 1 and 7. As a result, the adhesive X is impregnated into the sponge layer 3 from the outer peripheral surface 3a side to form the adhesive impregnated sponge layer 3 'in which the adhesive X is exposed to the outer peripheral surface. A puncture layer 2 in which an adhesive layer 4 made of an adhesive material X is formed on an outer peripheral surface 3, a of the layer 3 (an outer peripheral surface 3 a of the sponge layer 3).

Next, after the obtained puncture seal layer 2 is compressed and put into the pneumatic tire 1, the compression is released and the puncture seal layer 2 is bonded to the tire inner wall surface 1X via the bonding layer 4. You. As described above, since the outer peripheral length Ls of the sponge layer 3 is longer than the outer peripheral length Lt of the tire, the sponge layer 3 is compressed, and the seal layer 2 becomes the inner wall surface 1X of the tire. Attached to. The puncture layer 2 is pressed against the inner wall 1X of the tire by the compressed sponge layer 3 which is to be restored to the original size, so that the puncture layer can be compressed without applying a large pressing force from the outside and crimping. Layer 2 firmly adheres to the tire inner wall surface 1X. According to the self-sealing tire of the present invention described above, Since the sponge layer 3 is impregnated with the adhesive X used for the ink seal layer 2, the flow of the adhesive X due to centrifugal force during running of the vehicle can be prevented. Therefore, since the adhesive X does not flow toward the center of the crown 11, the puncture sealing property can be exhibited even near the shoulder S.

 In addition, since the adhesive X is impregnated so as to be exposed on the outer peripheral surface side of the sponge layer 3 and is not exposed on the inner peripheral surface side, no dust or foreign matter adheres during transportation or storage. Therefore, the appearance does not deteriorate. In addition, there is no sticking material to workers' hands and equipment when handling tires, so handling is improved.

 Moreover, the adhesive material X is impregnated in the sponge layer 3 in advance, and the puncture layer 2 is made to be a tire in order to make the outer peripheral length Ls of the sponge layer 3 longer than the outer peripheral length Lt of the tire as described above. When the compressed sponge layer 3 is restored to its original size when mounted on the inner wall surface IX, the puncture layer 2 is pressed against the tire inner wall surface 1X, and the outer surface is pressed by a pressing roller or the like. The puncture seal layer 2 can be easily and firmly adhered to the tire inner wall surface 1X without performing an operation of applying a large pressing force and pressing the tire. Therefore, good workability can be obtained.

 If the outer peripheral length Ls of the sponge layer 3 is smaller than 1.1 Lt, the sponge layer 3

The puncture seal layer 2 is firmly adhered to the tire inner wall 1X by the restoring force of 3. It becomes difficult to perform puncture and the puncture sealability deteriorates. Conversely, if it is larger than 1.3 Lt, the sponge layer 3 is too long in circumference, so that the sponge layer 3 is partially bent to the inner peripheral side, resulting in insufficient adhesion and a nail or the like being stuck. When this occurs, the portion peels off from the tire inner wall surface 1X, causing a decrease in puncture sealability.

 FIG. 5 shows another example of the puncture layer used in the self-sealing tire of the present invention. In the adhesive layer 2, the adhesive layer 4 is made of an adhesive Y having a high-viscosity sealing property and made of an adhesive composition different from the adhesive X.

 As shown in FIG. 6, such a puncture seal layer 2 was discharged from the discharge port 6 of the first adhesive extruder onto the outer peripheral surface 3a of the annular sponge layer 3 rotated by the rollers 5, 5. Adhesive material X is pressed sequentially by a pair of rollers 7,7. Thus, the adhesive X is impregnated into the sponge layer 3 from the outer peripheral surface 3a side, and the adhesive impregnated sponge layer 3 'in which the adhesive X is exposed to the outer peripheral surface is sequentially formed.

 Next, the adhesive Y discharged from the discharge port 8 of the first adhesive extruder is sequentially pressed against the outer peripheral surfaces 3 and a of the adhesive-impregnated sponge layer 3 by a pair of rotating rollers 19 and 9. Thereby, the adhesive layer 4 is sequentially formed on the outer peripheral surfaces 3 and a. The puncture seal layer 2 is formed by pressure-bonding the adhesives X and Y to the sponge layer 3 once.

 The puncture seal layer 2 thus formed is adhered to the sunset side wall surface 1X in the same manner as described above.

 Even if the adhesive layer 4 of the puncture seal layer 2 is made of the adhesive Y different from the adhesive X as described above, the same effect as described above can be obtained.

In the puncture seal layer 2 shown in FIG. 5, the adhesive layer 4 is formed on the tire inner wall surface IX, and the adhesive impregnated sponge layer 3 is bonded to the adhesive layer 4. , May be formed. Further, the adhesive layer 4 may be formed using the adhesive X as a matter of course.

In the present invention, the thickness of the sponge layer 3 before the mounting of the puncture layer and the impregnation depth of the adhesive X impregnating the sponge layer 3 can be appropriately selected according to the size of the pneumatic tire to be mounted. it can. From the viewpoint of preventing an excessive increase in tire weight and good sealing properties, it is preferable to set the thickness t of the sponge layer 3 to 5 to 15 mm and the impregnation depth h of the adhesive X to 4 to 12 mm. . Further, the impregnation amount of the adhesive X is preferably set to 0.1 to 0.5 g / cm ³ .

 As a material for forming the sponge layer 3, a rubber having continuous bubbles that can be impregnated with the adhesive X, or a foam of a resin such as polyurethane or nylon can be preferably used. Desirably, an open-cell ether polyurethane foam is used.

 As the pressure-sensitive adhesive composition used for the pressure-sensitive adhesive X, it is preferable to use a mixture of an elastomer, a low-molecular-weight oligomer such as amorphous polyolefin, paraffin oil, or liquid bolybdenum, and a resin such as petroleum resin. As the elastomer, for example, the use of at least one elastomer selected from the group consisting of butyl rubber, polyisobutylene, natural rubber, isoprene rubber, and polybutene is used. It is preferable to enhance the performance.

 When the adhesive layer 4 is also formed by the adhesive material X, a mixture of the above-mentioned elastomer and a low molecular weight oligomer such as liquid polybutene or a resin such as a petroleum resin can be used.

As the pressure-sensitive adhesive composition used for the pressure-sensitive adhesive Y, the same one as in the case where the bonding layer 4 is also formed by the pressure-sensitive adhesive X can be used. . Adhesives X and Y may be blended with an appropriate crosslinking agent or vulcanizing agent to impart heat resistance to the adhesive. For example, when butyl rubber or polybutene is used, ρ-quinone dioxime can be combined.

 The pressure-sensitive adhesives X and Υ are preferably composed of a pressure-sensitive adhesive composition that does not contain a solvent, and the viscosity thereof is preferably adjusted to about 1000 OPas. Example, a puncture in which the tire size was made common to 205/65 R15 and the outer peripheral length Ls of the sponge layer on the inner wall surface of the tire was changed as shown in Table 1 with respect to the outer peripheral length Lt of the tire Tires 1 to 3 of the present invention and comparative tires 1 and 2 having the configuration shown in FIG.

 In the tire of the present invention and the comparative tire, the sponge layer was composed of an open-cell polyester polyurethane foam, and the adhesive used was a composition mainly composed of butyl rubber and liquid polybutene.

 Further, in the tire of the present invention and the comparative tire, the thickness t of the sponge layer and the impregnation depth h of the adhesive are as shown in Table 1, respectively.

 Each test tire was mounted on a rim with a rim size of 15 X 6 JJ, the air pressure was set to 100 kPa, and puncture seal performance evaluation tests were performed under the following measurement conditions. The result was obtained.

Puncture seal performance

After nails were inserted into the crown of each test tire so as to penetrate the puncture seal layer, the nails were pulled out and each test tire was allowed to stand for 24 hours. Twenty-four hours later, the air pressure of each test tire was measured. 〇 means no air leak, X means air leak. table 1

 From Table 1, it can be seen that the tire of the present invention in which the sponge layer peripheral length Ls is 1.1 to 1.3 times the tire outer peripheral length Lt exhibits excellent puncture sealing performance. .

 On the other hand, the comparative tires 1 and 2 in which the outer peripheral length Ls of the sponge layer is out of the range of the present invention have impaired puncture sealing performance. Therefore, in order to improve the operability without impairing the puncture seal performance and applying a large pressing force from outside to improve the workability, the outer peripheral length Ls of the sponge layer should be made larger than the tire peripheral length Lt. It is clear that it is better to increase the value by 1.1 to 1.3 times.

 As described above, according to the present invention, since the sponge layer is impregnated with the adhesive used for the puncture seal layer, it is possible to prevent the adhesive from flowing toward the center of the crown due to centrifugal force during vehicle running. Can be.

Also, do not expose the adhesive to the inner peripheral surface, Since it is exposed, the appearance is not deteriorated due to the attachment of dust or foreign matter during transportation or storage, and the handling property can be further improved.

 In addition, by pre-impregnating the sponge layer with an adhesive and defining the outer peripheral length as described above, the puncture seal can be performed without applying a large pressing force from the outside with a pressing roller or the like. Workability is improved because the layer can be easily and firmly adhered to the tire inner wall surface.

 Industrial applicability

 The present invention having the above-described excellent effects has a self-sealing function that closes a puncture hole and prevents the air of the tire from leaking to the outside when a nail or the like penetrates through the crown portion during running of the vehicle and the tire is punctured. Selfie having-can be used very effectively.

Claims

The scope of the claims  1. A self-sealing tire having a puncture seal layer attached to the entire inner surface of the tire from one shoulder portion to the other shoulder portion of the pneumatic tire, wherein the puncture seal layer is adhered so as to be exposed to the outer peripheral surface side. An adhesive layer made of an adhesive material that adheres to the inner wall surface of the tire is provided on the outer peripheral surface of the annular sponge layer impregnated with the material, and the outer peripheral surface of the sponge layer before attaching the nozzle layer is attached. A self-sealing tire in which the relationship between the length L s and the tire circumferential length L t at the center line of the pneumatic tire is 1.1 L t ≤ L s ≤ 1.3 L t.  2. The self-sealing tire according to claim 1, wherein the adhesive layer is made of the same adhesive composition as the adhesive material impregnated in the sponge layer.  3. The self-sealing tire according to claim 2, wherein the adhesive layer is integrally formed on an outer peripheral surface of the sponge layer.  4. The self-sealing tire according to claim 1, 2 or 3, wherein the thickness of the sponge layer before mounting the puncture seal layer is set to 5 to 15 rows.  5. The self-sealing tire according to claim 4, wherein the impregnation depth of the adhesive material impregnated in the sponge layer is 4 to 12 before the puncture layer is attached.  6. The self-sealing tire according to claim 1, wherein the pressure-sensitive adhesive is made of a pressure-sensitive adhesive composition containing no solvent. 7. A method for manufacturing a self-sealed tire having a puncture layer mounted on the entire inner surface of the tire from one shoulder part to the other shoulder part of the pneumatic tire, the method comprising: An annular sponge layer having an outer peripheral length Ls that is 1.1 to 1.3 times the outer peripheral length Lt of the tire is impregnated with an adhesive from the outer peripheral side, and the adhesive is applied to the outer peripheral side. Forming an adhesive material-impregnated sponge layer to be exposed; An adhesive layer made of adhesive on the outer surface of the sponge layer impregnated with the material i A method of manufacturing a self-sealing tire in which a metal layer is formed and the rubber seal layer is bonded to the inner wall surface of the tire via the adhesive layer.  8. The method for producing a self-sealing tire according to claim 7, wherein the pressure-sensitive adhesive comprises a pressure-sensitive adhesive composition containing no solvent.  9. A method for manufacturing a self-sealing tire in which a puncture seal layer is provided over the entire inner surface of a tire from one shoulder part to the other shoulder part of the pneumatic tire, and the tire outer circumference at the center line of the pneumatic tire. An adhesive is impregnated from the outer peripheral surface side of an annular sponge layer having an outer peripheral length Ls of 1.1 to 1.3 times the length Lt, and the adhesive material is exposed to the outer peripheral surface side. At the same time as forming the adhesive material-impregnated sponge layer, the adhesive layer made of the adhesive material is integrally formed on the outer peripheral surface of the adhesive material-impregnated sponge layer to form a puncture layer. A method of manufacturing a self-sealing tire in which a single layer is adhered to the inner wall surface of the self-sealing member via the adhesive layer.  10. The method for producing a self-sealing tire according to claim 9, wherein the adhesive comprises an adhesive composition containing no solvent.