Pneumatic tire and method of manufacturing tire vulcanization mold
a pneumatic tire and tire vulcanization technology, which is applied in the field of pneumatic tires, can solve the problems of inability to obtain tires with appropriate gloss, inconsistency in tire gloss, and lack of gloss, so as to improve the appearance, eliminate coarse texture, and improve the appearance
Inactive Publication Date: 2014-12-25
BRIDGESTONE CORP
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Benefits of technology
The present invention relates to a pneumatic tire with a smooth outer surface and a moist texture. The tire's arithmetical mean roughness is in the range of 0.1-0.6 μm. The method of manufacturing the tire vulcanization mold involves propelling spherical abrasive grains onto the surface of the mold under specific conditions to process the surface. The abrasive grains have a grain diameter of not more than 850 μm. The resulting tire has a more deeply-black and moist texture on the surface of the tread portion or side portions, and a better appearance. The invention also provides a tire vulcanization mold that can manufacture tires with a better appearance by propelling abrasive grains at a pressure of 0.1-0.2 MPa.
Problems solved by technology
Once these random irregularities are transferred to the surface of the vulcanized tire, the tire surface disorderly diffuses light, and thereby the tire ends up having no gloss while having a black and yet coarse texture.
Accordingly, it may be concluded that there are other factors than the aforementioned parameters that cause inconsistency in the tire gloss, and it is impossible to constantly obtain tires with an appropriate gloss without controlling these factors.
However, as discussed above, it is impossible to constantly supply such a tire using the prior art disclosed in Patent Documents 1-3.
Method used
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[0049]A plurality of molds for tire vulcanization, which were subjected to different surface processes respectively, were used to manufacture tires. The arithmetical mean roughness Ra with the reference length Lr of 20 μm, the irregularity diameter and the irregularity depth of the surface of each of the manufactured tires were measured. Further, sensory evaluation was conducted on the condition of the tire surface. The following Tables 4-6 show the evaluation results.
[0050]Processes A-H, shown in the following tables, were performed using different shapes, grain diameters and propelling pressures of the abrasive grains, as shown in Table 3. For the Processes A-H, the propelling time was 30 seconds, respectively.
TABLE 3Process A(Conventional)Process BProcess CProcess DShape of abrasivePolygonalSphericalSphericalSphericalgrainsGrain diameter (μm)60-80150-180300-425425-600Propelling pressure0.60.20.20.2(MPa)Process EProcess FProcess GProcess HShape of abrasiveSphericalSphericalSpheric...
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Abstract
A pneumatic tire has an outer surface with an arithmetical mean roughness Ra in the range of 0.1 μm to 0.6 μm when a reference length Lr is 20 μm, wherein the outer surface has an irregularity diameter in the range of 40-230 μm and an irregularity depth in the range of 3-22 μm. A method of manufacturing a tire vulcanization mold includes propelling spherical abrasive grains onto the surface of the mold under the condition that a propelling pressure is in the range of 0.1-0.6 MPa, so as to process the surface of the mold.
Description
[0001]This is a divisional application of application Ser. No. 13 / 637,585 filed Oct. 19, 2012, which in turn is a U.S. National Stage of PCT / JP2011 / 058377 filed Mar. 25, 2011, which claims foreign priority to JP 2010-073477 filed Mar. 26, 2010. The disclosure of the prior applications is hereby incorporated by reference herein in its entirety.TECHNICAL FIELD[0002]The present invention relates to a pneumatic tire and a method of processing the surface of a tire vulcanization mold. In particular, the present invention relates to a pneumatic tire that has an appropriate gloss and a deeply-black and moist texture on its surface, thereby achieving a good appearance, and to a method of manufacturing a tire vulcanization mold that is capable of forming such a pneumatic tire.BACKGROUND ART[0003]In general, a tire vulcanization mold is firstly made by casting, and then is finished by subjecting its surface to an abrasive blasting process using abrasive grains made of alumina or the like.[000...
Claims
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IPC IPC(8): B29C33/38B29D30/06B24C1/00
CPCB29C33/3842B29D30/0662B24C1/00B29C33/424B29D30/0606B29D30/72B29D2030/0616B29L2030/00B60C13/001B60C11/00Y10T152/10495B24C1/10B24C1/06B60C2011/0016B60C2013/005B60C13/00B29C37/0053B60C5/00
Inventor IKEMURA, KOJI
Owner BRIDGESTONE CORP