A process for solving the tire rim line bubble and a tire

Abstract

The application discloses a process method for solving tire rim line bubbles and a tire. The technical scheme of the process method is to control the extrusion temperature of the tire raw material white glue to be 100-110 DEG C. The tire comprises a tread part, a sidewall part and a bead part. The sidewall part comprises a wear-resistant glue layer, a sidewall glue layer, a sidewall reinforcing glue layer, a white glue layer and a yellow glue layer. The tread part, the sidewall glue layer, the wear-resistant glue layer and the bead part are sequentially connected. The outer end point of the connection between the sidewall glue layer and the wear-resistant glue layer is M point. The sidewall reinforcing glue layer is located above the sidewall glue layer. The yellow glue layer is located above the sidewall reinforcing glue layer. The white glue layer is located above the sidewall reinforcing glue layer and the sidewall glue layer. The end point of the white glue layer above the sidewall glue layer is N point. The straight line distance between M point and N point is 3-5 mm. The application can effectively solve the problem of bubbles at the tire rim line position.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of tire manufacturing, and particularly relates to a process method for solving tire rim line bubbles and a tire. BACKGROUND

[0002] With the change of living standards and the times, cars replace bicycles, motorcycles and electric vehicles and gradually become the main means of transportation, however, most of the tires are black, which often makes people feel monotonous and lack of individuality. Gold edge tire was born in Chicago, USA in 1914, and the patented "gold edge" shape is its unique symbol. Because the sidewall is pasted with yellow rubber sheet, it shines in the sunlight, so it is called "gold edge tire", which has excellent performance and cool appearance, and is often used in luxury cars.

[0003] The sidewall rubber formula of the gold edge tire is special and is a non-polluting material, which is high in cost and excellent in performance. The gold edge tire needs to increase yellow rubber on the basis of the rubber layer used in ordinary tires to present the gold edge, and the sidewall rubber is composed of more than four kinds of rubber, each rubber layer is overlapped, the material end point is numerous, and the design requirement is high.

[0004] The existing gold edge tire frequently occurs the problem of rim line bubbles in the production process. In order to solve the problem, the prior art improvement measures include adjusting the forming and pressing parameters, adjusting the curing and shaping height and shaping pressure, and reducing the thickness of the white rubber sheet, but the above methods have little effect, and the problem of rim line bubbles cannot be effectively solved, which affects the quality of the tire. SUMMARY

[0005] In view of various deficiencies of the prior art, in order to effectively solve the problem of bubbles at the position of the tire rim line, a process method for solving tire rim line bubbles and a tire are provided, and the following technical solutions are provided:

[0006] A process method for solving tire rim line bubbles, which controls the rubber discharge temperature of the white rubber of the tire raw material in the extrusion process to be 100-110 DEG C.

[0007] The present application is further provided as follows: the temperature of the plasticizing section, the screw extrusion section and the head section of the extruder is controlled to be 80 DEG C, 85 DEG C and 90 DEG C respectively, and the tolerance is ± 3 DEG C.

[0008] A tire comprises a tread portion, a sidewall portion and a bead portion, the sidewall portion comprises a wear-resistant rubber layer, a sidewall rubber layer, a sidewall reinforcing rubber layer, a white rubber layer and a yellow rubber layer, the tread portion, the sidewall rubber layer, the wear-resistant rubber layer and the bead portion are sequentially connected, an outer end point of the sidewall rubber layer connected with the wear-resistant rubber layer is M point, the sidewall reinforcing rubber layer is located above the sidewall rubber layer, the yellow rubber layer is located above the sidewall reinforcing rubber layer, the white rubber layer is located above the sidewall reinforcing rubber layer and the sidewall rubber layer, an end point of the white rubber layer above the sidewall rubber layer is N point, and a straight line distance between the M point and the N point is 3mm-5mm.

[0009] The application is further provided that: the top of the sidewall rubber layer is concave to form a cavity, the sidewall reinforcing rubber layer is located in the cavity, and the thickness of the sidewall reinforcing rubber layer is greater than the height of the cavity.

[0010] The application is further provided that: the width of the sidewall reinforcing rubber layer is less than the width of the sidewall rubber layer, and the width of the sidewall reinforcing rubber layer is greater than the width of the yellow rubber layer.

[0011] The application is further provided that: the thickness of the sidewall rubber layer is 6.5mm-8.0mm, the thickness of the sidewall reinforcing rubber layer is 1.8mm-2.0mm, and the thickness of the wear-resistant rubber layer is 4.5-6.0mm.

[0012] The application is further provided that: the bottom of the sidewall reinforcing rubber layer is parallel to the yellow rubber layer, and the thickness of the yellow rubber layer is 1.0mm-1.2mm.

[0013] The application is further provided that: the white rubber layer and the yellow rubber layer are connected to form P point, and the P point is located above the sidewall reinforcing rubber layer, and the thickness of the white rubber layer is 1.0mm-1.2mm.

[0014] The application is further provided that: the M point is located on the outer side of the N point, and the outer side is the side away from the tread portion.

[0015] In summary, the application has the following beneficial effects compared with the prior art:

[0016] 1、The application optimizes the glue discharge temperature of the white rubber in the extrusion process of the tire raw material, reduces the moisture absorption of the white rubber, avoids the large amount of water vapor generated in the vulcanization process due to the high water content of the white rubber, and effectively prevents the batch occurrence of the rim line bubbles.

[0017] 2、By optimizing the structure of the tire, the end point of the white rubber layer above the sidewall rubber layer and the outer end point of the sidewall rubber layer connected with the wear-resistant rubber layer are staggered, the end point of the white rubber layer is avoided to cover the wear-resistant rubber layer, the internal stress of the white rubber layer is moderately dispersed, the glue flow is beneficial, the exhaust effect of the rim line position is further enhanced, and bubbles are avoided.

[0018] 3. In the tire, the white rubber layer is located 3mm-5mm away from the end point of the sidewall rubber layer and the outer end point where the sidewall rubber layer connects with the wear-resistant rubber layer, which can avoid abnormal wear of the sidewall rubber layer and the rim caused by the excessive straight-line distance between the two, and can also avoid stress concentration effect caused by the insufficient straight-line distance between the two, thereby avoiding early fatigue damage of the tire.

[0019] 4. In the tire, the sidewall reinforcing rubber layer is used in combination with the sidewall rubber layer to improve the performance of the tire. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of bubble discharge of the rim line in the specific embodiment;

[0021] Figure 2 is a schematic diagram of the structure of the extruder in the specific embodiment;

[0022] Figure 3 is a schematic diagram of the overall structure of the tire before optimization in the specific embodiment;

[0023] Figure 4 is Figure 3 a local enlarged view of B in the specific embodiment;

[0024] Figure 5 is a schematic diagram of the overall structure of the tire after optimization in the specific embodiment;

[0025] Figure 6 is Figure 5 a local enlarged view of A in the specific embodiment.

[0026] In the drawings: 10, plasticizing section; 20, screw extrusion section; 30, head section; 1, tread portion; 2, sidewall rubber layer; 3, wear-resistant rubber layer; 4, sidewall reinforcing rubber layer; 5, yellow rubber layer; 6, white rubber layer. DETAILED DESCRIPTION

[0027] In order for those skilled in the art to better understand the technical solutions of the present application, the technical solutions of the present application will be described clearly and completely below in combination with the embodiments of the present application. Based on the embodiments in the present application, other similar embodiments obtained by those skilled in the art without making creative efforts should all belong to the scope of protection of the present application.

[0028] The following specific embodiments are described by taking gold-edged tires as examples, and the following specific embodiments are the most preferred embodiments, which do not limit the scope of protection of the present application. Specific embodiment 1

[0030] In some embodiments, as shown in Figure 1 , the present application has been verified by long-term experiments, and it is found that the root cause of the bubble generation of the rim line of the gold-edged tire is that:

[0031] (1) The white rubber sheet formula of the gold edge tire contains hygroscopic materials such as kaolin and light CaCO3, and the factors such as low glue temperature in the internal mixer and non-drying of the rubber sheet release agent are superimposed to cause the high water content of the white rubber;

[0032] 2) In the white rubber extrusion process, the white rubber glue temperature is low, and the water is not easy to discharge in the production process, so that the obtained white rubber sheet has high water content;

[0033] 3) When the water content of the white rubber sheet is high, the sulfurization process is above 100 DEG C, and the gas is volatilized;

[0034] 4) If the water vapor can be completely discharged, there is no bubble, on the contrary, if the water vapor cannot be completely discharged, bubbles will be formed, and the exhaust is most difficult at the rim line position, so the probability of bubble at the rim line position is the largest.

[0035] Therefore, the present application provides a process for solving the bubble of the tire rim line, and the technical key points are to control the glue temperature of the white rubber of the tire raw material in the extrusion process to be 100-110 DEG C.

[0036] As shown in Figure 2 The temperature of the plasticizing section 10, the screw extrusion section 20 and the head section 30 in the extruder is controlled to be 80 DEG C, 85 DEG C and 90 DEG C respectively, and the tolerance is ± 3 DEG C, which can effectively ensure that the glue temperature of the white rubber reaches 100-110 DEG C, greatly reduces the bubble occurrence at the position of the tire rim line, and does not affect the processing safety of the rubber material.

[0037] In the plasticizing section 10, after the white rubber enters the extruder to form a rubber mass, the rubber mass is further softened and compressed in the process of rotating along the space of the thread groove and continuously advancing, so that the gap between the rubber masses is reduced and the density is increased, and then the rubber masses are adhered to each other, thereby achieving the effect of plasticizing the rubber material. The temperature setting value of the plasticizing section of the extruder is a key process parameter. If the temperature setting value is high, the plasticizing effect of the rubber material is good, and vice versa. Preferably, the temperature of this section in the embodiment is set to 80 DEG C.

[0038] In the screw extrusion section 20, after the rubber material enters the extrusion section to form a viscous fluid, the rubber material is further pushed forward by the axial force generated by the rotation of the screw. In the whole screw extrusion process, the flow of the rubber material in the barrel can be divided into four forms: forward flow, reverse flow, cross flow and leakage flow. In this process, the flowability of the rubber material is further enhanced. The temperature setting value of the screw extrusion section of the extruder is very critical. If the temperature setting value is high, the flowability of the rubber material is good, and vice versa. Preferably, the temperature of this section in the embodiment is set to 85 DEG C.

[0039] In the head section 30, after the rubber leaves the thread groove, it reaches a flowing area before the die plate, the rubber flow changes from rotary motion to linear motion, and the rubber has certain viscosity, in this process, the rubber flow is further enhanced, the temperature setting value of the extruder extrusion section is also crucial, if the temperature setting value is high, the rubber is easy to scorch, the performance is reduced, on the contrary, the rubber is difficult to discharge, and the surface is not smooth. Preferably, the temperature of this section in the embodiment is set to 90°C.

[0040] When the white rubber sheet is extruded, the extrusion temperature control standard is adjusted from the original extrusion process temperature setting value of 70°C / 75°C / 80°C to 80°C / 85°C / 90°C, after setting the temperature of each section, when the instrument display temperature reaches the standard, the actual temperature of each section is measured by the external temperature gun, and the machine is started after meeting the tolerance requirement of ±3°C; when the white rubber sheet is extruded, the rubber discharge temperature of the extruder is increased from 90°C-95°C to 100°C-110°C. When the actual temperature of each section of the extruder is located in the positive tolerance, the discharge temperature reaches the upper limit of 110°C, and when the actual temperature of each section of the extruder is located in the negative tolerance, the discharge temperature reaches the lower limit of 100°C, so that the discharge temperature is located in 100-110°C under the adjusted process temperature. The discharge temperature of the rubber should not be higher than 110°C, and the scorching time of the white rubber in the tire is relatively short, and the discharge temperature of the rubber should not be too high under the condition of meeting the appearance quality of the finished tire, otherwise the cured rubber is easy to scorch.

[0041] In some embodiments, the structure of the gold-edged tire is as shown in Figures 2-3 The tire includes a tread portion 1, a sidewall portion and a bead portion, the sidewall portion includes a wear-resistant rubber layer 3, a sidewall rubber layer 2, a sidewall reinforcing rubber layer 4, a white rubber layer 6 and a yellow rubber layer 5. From the tread portion 1 to the bead portion, the tread portion 1, the sidewall rubber layer 2, the wear-resistant rubber layer 3 and the bead portion are sequentially connected, the outer end point of the connection between the sidewall rubber layer 2 and the wear-resistant rubber layer 3 is M point, and the outer end point is located at the connection interface of the sidewall rubber layer 2 and the wear-resistant rubber layer 3 and on the outer surface of the tire.

[0042] The sidewall reinforcing rubber layer 4 is located above the sidewall rubber layer 2, specifically, the top of the sidewall rubber layer 2 is concave to form a cavity, the sidewall reinforcing rubber layer 4 is located in the cavity, and the thickness of the sidewall reinforcing rubber layer 4 is greater than the height of the cavity, that is, the top of the sidewall reinforcing rubber layer 4 protrudes out of the cavity. The yellow rubber layer 5 is located above the sidewall reinforcing rubber layer 4, preferably, the width of the sidewall reinforcing rubber layer 4 is less than the width of the sidewall rubber layer 2, and the width of the sidewall reinforcing rubber layer 4 is greater than the width of the yellow rubber layer 5. The white rubber layer 6 is located above the sidewall reinforcing rubber layer 4, the sidewall rubber layer 2 and the wear-resistant rubber layer 3, the end point of the white rubber layer 6 above the wear-resistant rubber layer 3 is N point, and the white rubber layer 6 covers the end point of the wear-resistant rubber layer 3. The bottom of the sidewall reinforcing rubber layer 4 is parallel to the yellow rubber layer 5, the white rubber layer 6 and the yellow rubber layer 5 are connected to form P point, and P point is located above the sidewall reinforcing rubber layer 4.

[0043] The rubber of the tire side rubber layer 2 has low heat generation, strong flex resistance and slightly poor aging resistance, and the thickness of the tire side rubber layer 2 is 1.5-3 mm. The tire side reinforcing rubber layer 4 has strong aging resistance and weak flex resistance, and the tire side reinforcing rubber layer 4 is used in combination with the tire side rubber layer 2 to improve the performance of the tire, and the thickness of the tire side reinforcing rubber layer 4 is 1.8-2.0 mm. The wear-resistant rubber layer 3 has excellent wear resistance, and ensures that the tire does not fail due to abnormal wear during assembly with the rim and long-time load driving, and the thickness of the wear-resistant rubber layer 3 is 9.5-11 mm. The yellow rubber layer 5 is a decorative material, and the non-polluting rubber layer 5 has a thickness of 1.0-1.2 mm. The white rubber layer 6 is a decorative material, and the non-polluting rubber layer 6 has a thickness of 1.0-1.2 mm.

[0044] 1) The influence of the white rubber extrusion process optimization on the rim line bubble of the gold edge tire is investigated:

[0045] (1) The temperature parameters of the white rubber extrusion process are optimized under the condition that the same raw material formula and structure of the gold edge tire are used and the same rubber is used, and the specific optimization is as follows:

[0046] Table 1 Comparison of the setting temperature of each section and the white rubber extrusion temperature before and after the extrusion process optimization

[0047] Original process temperature (°C) New process temperature (°C) Plasticizing section 70 80 Screw extrusion section 75 85 Die section 80 90 Discharge temperature 90-95 100-110

[0048] The original process temperature is set to 70℃, 75℃ and 80℃ for the plasticizing section, the screw extrusion section and the head section of the extruder respectively for the consideration of process safety and rubber performance safety, so that the final extrusion temperature does not exceed 100℃, but since the white rubber formula contains materials such as kaolin with strong hygroscopicity, the white rubber has strong hygroscopicity, and the volatile matter and moisture in the rubber cannot be discharged at this temperature, which increases the probability of rim line bubble occurrence.

[0049] The new process optimizes the temperature of each section of the extruder, and the extrusion temperature is controlled at 100-110℃ for the consideration of comprehensive factors, so as to reduce the volatile matter and moisture in the white rubber, and effectively reduce the probability of bubble occurrence at the rim line position of the gold edge tire.

[0050] Considering that the increase of the process temperature may lead to the decrease of the performance of the white rubber and the decrease of the safety time, a large amount of data accumulation and verification are made in the present application.

[0051] (2) The fast inspection and physical property data of the white rubber sheets extruded under the extrusion processes before and after the optimization are compared and analyzed as follows under the condition that the same raw material formula and structure of the gold edge tire are used and the same rubber is used:

[0052] Table 2 Comparison of the fast inspection data (185℃*3min) MDR of the white rubber sheets obtained before and after the extrusion process optimization

[0053]

[0054] Table 3 Comparison data of physical properties of white rubber sheet obtained before and after optimization of extrusion process

[0055]

[0056] From the above comparison results, it can be seen that increasing the white rubber discharge temperature in the extrusion process by 10°C does not significantly reduce the safety time of the white rubber, nor does it cause a decrease in the performance of the obtained white rubber material.

[0057] Table 4 Bubble defect rate data of gold edge tire rim line obtained before and after optimization of extrusion process

[0058]

[0059] From Table 4, it can be seen that under the same rubber material and the same gold edge tire specification, the optimized process can significantly reduce the occurrence rate of gold edge tire rim line bubbles.

[0060] By optimizing the discharge temperature of the white rubber of the gold edge tire raw material in the extrusion process, the hygroscopicity of the white rubber is reduced, which avoids the high water content in the white rubber from causing a large amount of water vapor to be generated during the vulcanization process and unable to be completely discharged along the rim line, effectively preventing the batch occurrence of rim line bubbles. The defect rate is reduced from 10,000 ppm to 1,000 ppm. According to the daily production of 400 gold edge tires, about 1,080 gold edge tires can be saved per year. Even without considering the decrease in customer complaint rate, the economic benefit of 432,000 yuan per year can be created from the rim line bubble defect alone. Specific embodiment 2

[0062] In some embodiments, the structure of the gold edge tire in specific embodiment 1 is optimized to improve the gold edge tire rim line bubble. The optimized gold edge tire structure is shown in Figures 5-6 A gold edge tire includes a tread portion 1, a sidewall portion, and a bead portion, the sidewall portion includes a wear-resistant rubber layer 3, a sidewall rubber layer 2, a sidewall reinforcing rubber layer 4, a white rubber layer 6, and a yellow rubber layer 5.

[0063] From the tread portion 1 to the bead portion, the tread portion 1, the sidewall rubber layer 2, the wear-resistant rubber layer 3, and the bead portion are connected in sequence. The outer end point of the connection between the sidewall rubber layer 2 and the wear-resistant rubber layer 3 is the M point, which is located at the connection interface between the sidewall rubber layer 2 and the wear-resistant rubber layer 3 and on the outer surface of the tire.

[0064] The sidewall reinforcing rubber layer 4 is located above the sidewall rubber layer 2. Specifically, the top of the sidewall rubber layer 2 is concave to form a cavity, and the sidewall reinforcing rubber layer 4 is located in the cavity. The thickness of the sidewall reinforcing rubber layer 4 is greater than the height of the cavity, i.e., the top of the sidewall reinforcing rubber layer 4 protrudes out of the cavity.

[0065] The yellow rubber layer 5 is located above the sidewall reinforcing rubber layer 4, preferably, the width of the sidewall reinforcing rubber layer 4 is less than the width of the sidewall rubber layer 2, and the width of the sidewall reinforcing rubber layer 4 is greater than the width of the yellow rubber layer 5.

[0066] The white rubber layer 6 is located above the sidewall reinforcing rubber layer 4 and the sidewall rubber layer 2, the end point of the white rubber layer 6 above the sidewall rubber layer 2 is the N point, and the straight line distance between the M point and the N point is 3mm-5mm, the structure is novel, by staggering the N point and the M point, the end point of the wear-resistant rubber layer 3 is avoided to be covered by the white rubber layer 6, the internal stress of the white rubber layer 6 at the bonding position of multiple rubber layers is moderately dispersed, which is beneficial to the flow of rubber material, enhances the exhaust effect of the rim line position, and avoids the generation of bubbles.

[0067] Preferably, the M point is located on the outer side of the N point, and the outer side is the side away from the tread portion 1. At the same time, the N point and the M point are staggered by 3mm-5mm, which can avoid abnormal wear of the sidewall rubber layer 2 and the rim caused by too large straight line distance between the two points, and can also avoid stress concentration effect caused by too small straight line distance between the two points, thereby avoiding early fatigue damage of the tire.

[0068] The bottom of the sidewall reinforcing rubber layer 4 is arranged in parallel with the yellow rubber layer 5, the white rubber layer 6 is connected with the yellow rubber layer 5 to form a P point, and the P point is located above the sidewall reinforcing rubber layer 4.

[0069] The rubber material of the sidewall rubber layer 2 has low heat generation, strong flex resistance, and slightly poor aging resistance, and the thickness of the sidewall rubber layer 2 is 6.5mm-8.0mm. The sidewall reinforcing rubber layer 4 has strong aging resistance and weak flex resistance, and the sidewall reinforcing rubber layer 4 is used in combination with the sidewall rubber layer 2 to improve the performance of the tire, and the thickness of the sidewall reinforcing rubber layer 4 is 1.8mm-2.0mm. The wear-resistant rubber layer 3 has excellent wear resistance, which ensures that the tire does not fail due to abnormal wear during assembly with the rim and long-time load driving. The thickness of the wear-resistant rubber layer 3 is 4.5-6.0mm. The yellow rubber layer 5 is a decorative material and a non-polluting rubber material, and the thickness of the yellow rubber layer 5 is 1.0mm-1.2mm. The white rubber layer 6 is a decorative material and a non-polluting rubber material, and the thickness of the white rubber layer 6 is 1.0mm-1.2mm.

[0070] The white rubber sheet obtained by using the original white rubber extrusion process (i.e. the extrusion temperature of the white rubber is 90℃-95℃) is used as raw material, and the gold edge tire in specific embodiment 1 is compared with the gold edge tire in specific embodiment 2:

[0071] Table 5: Rim line bubble defect rate data of different gold edge tire structures when the process is not optimized

[0072]

[0073]

[0074] As shown in Table 5, the rim line bubble defect rate decreased from 6000ppm to 800ppm, effectively reducing the probability of rim line bubbles occurring. Based on a daily production of 400 gold-edged tires, this translates to a saving of approximately 624 gold-edged tires per year, generating an annual economic benefit of 249,000 yuan from rim line bubble defects alone. Specific Implementation Example 3

[0076] In some embodiments, the optimized process in Specific Embodiment 1 is combined with the gold-edged tire with structural optimization in Specific Embodiment 2, which will not be described in detail here.

[0077] The white rubber extrusion process and the structure of the gold-rimmed tire were optimized. The rim line bubble rate was then compared with that before optimization. The results are as follows:

[0078] Table 6 Comparison of rim line bubble occurrence rate before and after extrusion process and gold-edged tire structure optimization.

[0079]

[0080]

[0081] The glue dispensing temperature of the white glue was optimized and controlled, from the original dispensing temperature of 90-95℃ to...

[0082] Temperatures of 100-110℃ can significantly reduce the probability of air bubbles forming along the rim line. Furthermore, optimizing the structure of the gold-edged tire and appropriately dispersing the internal stress of various rubber materials at the white adhesive bonding location from a product structure perspective facilitates rubber material flow and air release, further reducing the probability of air bubbles forming along the rim line. The combination of these two methods complements each other, essentially solving the problem of air bubbles forming along the rim line of gold-edged tires, resulting in good economic benefits.

[0083] By optimizing the structure of the gold-edged tire and the extrusion process of the white rubber, the final structure, compared to the original extrusion process and the original gold-edged tire structure, reduced the rim line bubble defect rate from 6000ppm to [missing value].

[0084] 800ppm, where the final defect rate refers to the final scrap rate, indicating that the optimized gold-rimmed tire structure and optimized extrusion process of this invention can effectively reduce the probability of rim line bubbles.

[0085] Based on a daily production of 400 gold-edged tires, approximately 624 gold-edged tires can be saved annually, and the economic benefit of 249,000 yuan can be generated annually from rim line bubble defects alone.

[0086] The application has been described in detail above, the above description is only the preferred embodiment of the application, and cannot limit the scope of the application, that is, all equivalent changes and modifications made according to the scope of the application should still fall within the scope of the application.

Claims

1. A method for solving the problem of the tyre rim Process for the production of linear bubbles, characterized in that The extrusion temperature of the raw material white rubber of the tire is controlled to be 100-110℃. The tire comprises a tread portion, a sidewall portion and a bead portion, the sidewall portion comprises a wear-resistant rubber layer, a sidewall rubber layer, a sidewall reinforcing rubber layer, a white rubber layer and a yellow rubber layer, the tread portion, the sidewall rubber layer, the wear-resistant rubber layer and the bead portion are sequentially connected, an outer end point of the sidewall rubber layer and the wear-resistant rubber layer is M point, the outer end point is located at the connecting surface of the sidewall rubber layer and the wear-resistant rubber layer and the outer surface of the tire, the sidewall reinforcing rubber layer is located above the sidewall rubber layer, the yellow rubber layer is located above the sidewall reinforcing rubber layer, the white rubber layer is located above the sidewall reinforcing rubber layer and the sidewall rubber layer, an end point of the white rubber layer above the sidewall rubber layer is N point, and the straight-line distance between M point and N point is 3-5mm.

2. The process method for resolving tire and rim line bubbles of claim 1, wherein, The temperature of the plasticizing section, the screw extrusion section and the head section of the extruder is controlled to be 80℃, 85℃ and 90℃ respectively, and the tolerance is ±3℃.

3. The process method for resolving tire and rim line bubbles of claim 1, wherein, The top of the sidewall rubber layer is concave to form a cavity, the sidewall reinforcing rubber layer is located in the cavity, and the thickness of the sidewall reinforcing rubber layer is greater than the height of the cavity.

4. The process method for resolving tire and rim line bubbles of claim 3, wherein, The width of the sidewall reinforcing rubber layer is less than the width of the sidewall rubber layer, and the width of the sidewall reinforcing rubber layer is greater than the width of the yellow rubber layer.

5. The process method for resolving tire and rim line bubbles of claim 1, wherein, The thickness of the sidewall rubber layer is 6.5-8.0mm, the thickness of the sidewall reinforcing rubber layer is 1.8-2.0mm, and the thickness of the wear-resistant rubber layer is 4.5-6.0mm.

6. The process method for resolving tire and rim line bubbles of claim 1, wherein, The bottom of the sidewall reinforcing rubber layer is parallel to the yellow rubber layer, and the thickness of the yellow rubber layer is 1.0-1.2mm.

7. The process method for resolving tire and rim line bubbles of claim 1, wherein, The white rubber layer and the yellow rubber layer are connected to form P point, and P point is located above the sidewall reinforcing rubber layer, and the thickness of the white rubber layer is 1.0-1.2mm.

8. The tire according to any one of claims 1-7. Process for the production of a rim line bubble, characterized in that M point is located on the outer side of N point, and the outer side is the side away from the tread portion.

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