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CN-122008740-A - Pneumatic tire and method for manufacturing the same

CN122008740ACN 122008740 ACN122008740 ACN 122008740ACN-122008740-A

Abstract

The invention provides a pneumatic tire and a method for manufacturing the same, wherein a sound absorbing material is adhered to the inner surface of the tire in a state that a release agent is adhered to the inner surface of the tire, thereby achieving both air retention and adhesiveness of the sound absorbing material without deteriorating the productivity of the tire. A sound absorbing material (6) is fixed on the inner surface of a tread (1) along the tire circumferential direction through an adhesive layer (7) by using a pneumatic tire vulcanized by using an air bag provided with a coating layer formed by a release agent, and the silicon content of the release agent detected by an X-ray fluorescence analysis method at least in the fixed region of the sound absorbing material (6) is 0.1-10.0 wt%.

Inventors

  • NARUSE MASAHIRO
  • HOSHIBA TAKASHI

Assignees

  • 横滨橡胶株式会社

Dates

Publication Date
20260512
Application Date
20171114
Priority Date
20170208

Claims (16)

  1. 1. A pneumatic tire vulcanized by using a bladder having a coating layer formed of a release agent, characterized in that, A sound absorbing material is fixed on the inner surface of the tread part along the tire circumferential direction through an adhesive layer, and the ratio of the silicon content of the release agent detected by an X-ray fluorescence analysis method to the silicon content measured by an X-ray fluorescence analysis device with a sheet sample obtained from a carcass layer and an inner liner layer of the tire as a measurement object is in the range of 0.1 to 10.0 wt% at least in the fixed region of the sound absorbing material.
  2. 2. A pneumatic tire according to claim 1, wherein, The stripping adhesion force of the adhesive layer is 5N/20 mm-100N/20 mm.
  3. 3. A pneumatic tire according to claim 1 or 2, wherein, The adhesive layer is formed by a double-sided adhesive tape, and the total thickness of the adhesive layer is 10-150 mu m.
  4. 4. A pneumatic tire as in any one of claims 1 to 3, wherein, The adhesive layer is formed of a double-sided tape containing only an adhesive or a double-sided tape containing an adhesive and a nonwoven fabric.
  5. 5. A pneumatic tire as in any one of claims 1 to 4, wherein, The sound absorbing member is disposed at a widthwise center position within a range of + -10 mm relative to the tire equator.
  6. 6. A pneumatic tire as in any one of claims 1 to 5, wherein, The volume of the sound absorbing piece is 10% -30% of the volume of the inner cavity of the tire.
  7. 7. A pneumatic tire as in any one of claims 1 to 6, wherein, The hardness of the sound absorbing piece is 80-150N, the tensile strength of the sound absorbing piece is more than 90kPa, and the elongation at break of the sound absorbing piece is more than 200%.
  8. 8. The pneumatic tire according to any one of claims 1 to 7, wherein the sound absorbing member has a missing portion at least one point in the tire circumferential direction.
  9. 9. A method for producing a pneumatic tire, in which a green tire is vulcanized using an air bladder having a coating layer formed of a release agent, characterized in that, When a sound absorbing material is fixed to the inner surface of the tread portion of a pneumatic tire after vulcanization, the ratio of the silicon content of the release agent detected by an X-ray fluorescence analysis method to the silicon content of a sheet sample obtained from the carcass layer and the inner liner of the tire as a measurement target measured by an X-ray fluorescence analysis device is set to be in the range of 0.1 to 10.0 wt% at least in the fixed region of the sound absorbing material, and the sound absorbing material is fixed to the fixed region of the sound absorbing material via an adhesive layer in the tire circumferential direction.
  10. 10. The method for manufacturing a pneumatic tire according to claim 9, wherein, The stripping adhesion force of the adhesive layer is 5N/20 mm-100N/20 mm.
  11. 11. The method for manufacturing a pneumatic tire according to claim 9 or 10, wherein, The adhesive layer is formed by a double-sided adhesive tape, and the total thickness of the adhesive layer is 10-150 mu m.
  12. 12. The method for manufacturing a pneumatic tire according to any one of claims 9 to 11, wherein, The adhesive layer is formed of a double-sided tape containing only an adhesive or a double-sided tape containing an adhesive and a nonwoven fabric.
  13. 13. The method for manufacturing a pneumatic tire according to any one of claims 9 to 12, wherein, The sound absorbing member is disposed at a widthwise center position within a range of + -10 mm relative to the tire equator.
  14. 14. The method for manufacturing a pneumatic tire according to any one of claims 9 to 13, wherein, The volume of the sound absorbing piece is 10% -30% of the volume of the inner cavity of the tire.
  15. 15. The method for manufacturing a pneumatic tire according to any one of claims 9 to 14, wherein, The hardness of the sound absorbing piece is 80-150N, the tensile strength of the sound absorbing piece is more than 90kPa, and the elongation at break of the sound absorbing piece is more than 200%.
  16. 16. The method for manufacturing a pneumatic tire according to any one of claims 9 to 15, wherein, The sound absorbing member has a missing portion at least one portion in the tire circumferential direction.

Description

Pneumatic tire and method for manufacturing the same The application relates to a divisional application of Chinese patent application with the application date of 2017, 11, 14, the application number of 201780085640.9 and the name of pneumatic tire and a manufacturing method thereof. Technical Field The present invention relates to a pneumatic tire and a method for manufacturing the same, and more particularly, to a pneumatic tire and a method for manufacturing the same, in which a sound absorbing material is adhered to an inner surface of the tire with a mold release agent, thereby achieving both air retention and adhesiveness of the sound absorbing material without deteriorating productivity of the tire. Background Among causes of tire noise, there is cavity resonance caused by vibration of air filled in a tire cavity. The tread portion of the tire that is in contact with the road surface during running of the vehicle vibrates due to the irregularities of the road surface, and this vibration vibrates the air in the cavity portion of the tire to generate the cavity resonance sound. In this cavity resonance, there is a frequency range that becomes noise, and it is important to reduce tire noise to reduce the noise level in this frequency range. As a method for reducing noise generated by such a cavity resonance phenomenon, a method has been proposed in which a sound absorbing material made of a porous material such as a sponge is attached to an inner circumferential surface of a tread portion via an elastic fixing band on an inner surface of a tire (for example, refer to patent document 1). However, in the case where the fixing of the sound absorbing member is dependent on the elastic fixing band, there is a problem in that the elastic fixing band is deformed at the time of high-speed running. On the other hand, when the bladder is used to vulcanize the green tire, the bladder is easily stuck to the inner surfaces of the bladder and the green tire, and thus the green tire and the bladder are prevented from sticking by applying a release agent to the inner surfaces of the green tire. In this case, if the sound absorbing material is directly adhered and fixed to the inner surface of the tire, there is a problem that the adhesion between the inner surface of the tire to which the release agent is adhered and the sound absorbing material is poor, and the sound absorbing material is easily peeled off. On the other hand, there is proposed a method in which a release agent is applied to the inner surface of a green tire, and the release agent is removed by polishing the inner surface of the tire after vulcanizing the green tire (for example, patent document 2). However, such polishing also reduces the thickness of the liner, and thus has a problem of deterioration of air retention. In addition, there is proposed a method in which a film is previously attached to the inner surface of a green tire, a release agent is applied to the inner surface of the green tire in a state where the film is attached, and the release agent is removed by peeling the film after vulcanizing the green tire (for example, patent document 3). However, since a step of peeling the film after vulcanization is required, the manufacturing time increases, and thus there is a problem in that the tire productivity is deteriorated. In addition, there is proposed a method of cleaning the inner surface of the tire to which the release agent is attached, but such a method cannot sufficiently remove the release agent, and there is a problem of poor tire productivity. Prior art literature Patent literature Patent document 1 Japanese patent No. 4281874 Patent document 2 Japanese patent No. 4410753 Patent document 3 Japanese patent application laid-open No. 2015-107690 Disclosure of Invention Problems to be solved by the invention The present invention provides a pneumatic tire and a method for manufacturing the same, wherein a sound absorbing material is adhered to the inner surface of the tire in a state that a release agent is adhered to the inner surface of the tire, thereby achieving both air retention and adhesiveness of the sound absorbing material without deteriorating the productivity of the tire. Technical proposal The pneumatic tire according to the present invention for achieving the above object is a pneumatic tire vulcanized by using an air bladder having a coating layer formed of a release agent, wherein a sound absorbing material is fixed to an inner surface of a tread portion along a tire circumferential direction via an adhesive layer, and an amount of silicon of the release agent detected by an X-ray fluorescence analysis method is 0.1 to 10.0 wt% at least in a fixing region of the sound absorbing material. The method for producing a pneumatic tire according to the present invention is a method for producing a pneumatic tire by vulcanizing a green tire using an air bladder having a coating layer formed of a mold release agent, wherein,