WO2021244678A1 - 一种改善轮胎凹凸不良的方法 - Google Patents

一种改善轮胎凹凸不良的方法 Download PDF

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Publication number
WO2021244678A1
WO2021244678A1 PCT/CN2021/110136 CN2021110136W WO2021244678A1 WO 2021244678 A1 WO2021244678 A1 WO 2021244678A1 CN 2021110136 W CN2021110136 W CN 2021110136W WO 2021244678 A1 WO2021244678 A1 WO 2021244678A1
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WIPO (PCT)
Prior art keywords
tire
radial height
sample
carcass
unevenness
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PCT/CN2021/110136
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English (en)
French (fr)
Inventor
王�锋
滕雷
陈东
朱丽艳
陈雪梅
鲁言宏
王智军
Original Assignee
山东玲珑轮胎股份有限公司
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Priority claimed from CN202020983339.9U external-priority patent/CN213413427U/zh
Priority claimed from CN202010536649.0A external-priority patent/CN111912682A/zh
Application filed by 山东玲珑轮胎股份有限公司 filed Critical 山东玲珑轮胎股份有限公司
Publication of WO2021244678A1 publication Critical patent/WO2021244678A1/zh

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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/48—Tyre cords
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
    • G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/02—Carcasses
    • B60C9/04—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
    • B60C9/08—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend transversely from bead to bead, i.e. radial ply

Definitions

  • the present invention provides a method for improving the unevenness of tires, and in particular relates to a method for controlling the high-temperature performance of carcass cords used in tires.
  • the carcass of modern semi-steel radial tires is mostly coated with fiber cords, which are cut to a fixed length by a cutting machine.
  • the single-layer carcass cord is wrapped around the building drum once and then overlapped.
  • the overlap is made of two layers of cord, which is thicker than other parts, and the tire is prone to uneven unevenness at the joint.
  • the method used by tire companies to control the unevenness is to increase the thickness of the tire sidewall compound to weaken the visual effect of the unevenness on people.
  • tire companies usually follow the requirements of the national standard for polyester dipped cord fabrics for tires. Among them, the dimensional stability of the cord is controlled, and the load elongation measurement method is as follows: The tensile measurement experiment was carried out at room temperature.
  • the present invention provides a method for improving tire unevenness to solve the problem that most of the existing improvement methods increase the thickness of the tire sidewall compound to improve the tire unevenness, which will inevitably lead to an increase in the production cost of the tire and affect the tire performance.
  • tires usually go through a high-temperature vulcanization stage for a certain period of time.
  • cords that directly cause tire unevenness usually only the elongation at room temperature is measured, and the necessary high-temperature performance testing methods are lacking.
  • the present application provides a method for improving the unevenness of a tire, including: a tire, in which carcass cords are arranged inside the tire, and the carcass cords are arranged inside the tire crown;
  • the method includes:
  • Step S1 Select samples, and select carcass cords on the cord fabric surface
  • Step S2 Adjust the temperature of the oven, and adjust the constant temperature inside the oven to 100°C-200°C;
  • Step S3 Carry out thermal cycling treatment, after raising the internal temperature of the oven to a prescribed temperature, put the sample into the oven for thermal cycling, the thermal cycling time is 5min-30min;
  • Step S4 Measure and calculate the free shrinkage rate. After the cord in the free state undergoes heat treatment for a specified time, measure the sample and calculate its free shrinkage rate;
  • Step S5 Tensile test, a tensile test is performed on the sample after the thermal cycle treatment, so as to detect the yield strength, tensile strength and elongation of the sample;
  • Step S6 Calculate the constant load elongation, and calculate the constant load elongation of the sample.
  • the carcass cord is selected on the ply fabric.
  • the selection principle is to select samples every 10 cm to 20 cm in width, and select ten samples, and the size of the samples is not less than 50 cm;
  • the constant temperature inside the oven is 185°C.
  • the sample is put into the oven for thermal cycling, and the standing time is selected as 15 minutes.
  • the calculation of free shrinkage rate is expressed by the arithmetic mean of the test values of ten samples, the initial length of the sample is L0, the maximum length of the sample after free shrinkage is L1, and the free shrinkage rate FS of a single cord is expressed as:
  • the tire includes: a crown 100, a sidewall 200, a carcass reinforcement 300, and a bead 400;
  • the crown 100 includes a tread rubber layer and a crown 100 reinforcement.
  • the sidewalls 200 extend radially outward from the bead 400 to the crown 100.
  • the bead 400 is in contact with the mounting rim, and the tire
  • the body reinforcement 300 surrounds the ring-shaped steel wire reinforcement structure so as to be anchored to each bead 400.
  • the tire further includes: a rubber reinforcement 500, which is arranged in the The carcass reinforcement 300 and the sidewall 200 are formed along the circumferential direction.
  • the radial height KB of the upper end point of the rubber reinforcement 500 is less than or equal to 40% of the overall radial height H of the tire.
  • the radial height KA of the apex 410 is greater than or equal to 7% of the overall radial height H of the tire and less than or equal to 15% of the overall radial height H of the tire.
  • the radial height KD of the lower end of the sub-port rubber 220 is greater than or equal to 18% of the overall radial height H of the tire and less than or equal to 30% of the overall radial height H of the tire.
  • the radial height KC of the upper end point is greater than or equal to 20% of the overall radial height H of the tire and less than or equal to 35% of the overall radial height H of the tire.
  • the method for improving the unevenness of a tire includes: a tire, wherein a carcass cord is arranged inside the tire, and the carcass cord is arranged inside the crown of the tire; the method includes: step S1: Select the sample and select the carcass cord on the cord fabric surface; Step S2: Adjust the temperature of the oven, and adjust the constant temperature inside the oven to 100°C-200°C; Step S3: Perform thermal cycling treatment to increase the internal temperature of the oven After reaching the specified temperature, put the sample into the oven for thermal cycle, the thermal cycle time is 5min-30min; Step S4: Measure and calculate the free shrinkage rate, the cord in the free state is subjected to heat treatment for the specified time, and the sample Measure the sample and calculate its free shrinkage rate; Step S5: Tensile test, perform a tensile test on the sample after thermal cycling treatment, so as to detect the yield strength, tensile strength and elongation of the sample; Step S6: Calculate the elongation at constant load and calculate the e
  • the method for improving tire unevenness is reasonable in design, simple to use and easy to operate.
  • the performance of the cord under the condition of high temperature vulcanization is controlled to improve The unevenness of the tire is poor.
  • the tire carcass cord When the tire is inflated, the tire carcass cord is in a state of expansion and stress, the carcass cord has high dimensional stability, and the tire is not prone to unevenness.
  • by providing a high-temperature free shrinkage detection and control method for the carcass cord it is ensured that the carcass cord maintains high dimensional stability under normal temperature and high-temperature vulcanization.
  • Figure 1 is a radial cross-sectional view of a tire according to an embodiment of the present invention
  • FIG. 1 is an explanatory diagram of the positioning of the embodiment of Figure 1 of the present invention.
  • Figure 3 is a test result of the bumpiness of the tire produced before and after in the embodiment of the present invention.
  • Figure 4 is a comparison of the incidence results before and after implementation of T145/90R1 in the embodiment of the present invention.
  • Fig. 5 is a radial cross-sectional view of a prior art tire.
  • 100 tire crown; 200, sidewall; 210, sidewall rubber; 220, spigot rubber; 300, carcass reinforcement; 400, bead; 410, apex; 420, bead wire; 500 , Rubber reinforcement.
  • step S1 Select the carcass cord on the cord fabric surface.
  • the selection principle is to select samples every 10cm to 20cm in width.
  • Step S2 Adjust the constant temperature inside the oven to 100°C-200°C
  • Step S3 Turn the oven into After the internal temperature rises to the specified temperature, put the sample into the oven for thermal cycle, the thermal cycle time is 5min-30min
  • step S4 The cord in the free state is subjected to heat treatment for the specified time, and then the sample is measured And calculate its free shrinkage rate.
  • Step S5 Perform a tensile test on the sample after the thermal cycle treatment, so as to detect the yield strength, tensile strength and elongation of the sample.
  • Step S6 Perform the constant load extension of the sample The length ratio is calculated.
  • step S1 the carcass cord is selected on the ply fabric surface.
  • the selection principle is to select samples every 10cm to 20cm in width, and select ten samples, and the size of the samples is not shorter than 50cm, the constant temperature inside the oven is 185°C in step S2, and after the temperature inside the oven is raised to the prescribed temperature in step S3, the sample is put into the oven for thermal cycling, and the standing time is 15 minutes.
  • the calculation of free shrinkage rate is expressed by the arithmetic average of the test values of ten samples.
  • the initial length of the sample is L0
  • the maximum length of the sample after free shrinkage is L1
  • the free shrinkage rate FS of a single cord is expressed as:
  • a tire improved according to the above method includes: a crown 100, a sidewall 200, a carcass reinforcement 300, and a bead 400;
  • the tire crown 100 includes a tread rubber layer and a tire crown 100 reinforcement.
  • the sidewall 200 extends radially outward from the bead 400 to the tire crown 100.
  • the bead 400 is in contact with the mounting rim, and the carcass reinforcement 300 surrounds the ring-shaped steel wire. The reinforcing structure is thereby anchored to each bead 400.
  • the high temperature performance of the cord is controlled to improve the tire unevenness.
  • the principle is to use a thermal cycle oven. In the hot air at a constant temperature, the cord in the free state is regulated. After the time of heat treatment, measure and calculate its free shrinkage rate, and then perform a tensile test and calculate its constant load elongation. The sum of the two is the dimensional stability index of the cord under the condition of free shrinkage.
  • the tire The smaller the value of the concavity and convexity test result, the better the performance. In the comparison of the incidence results before and after the implementation of T145/90R1, the smaller the value, the lower the defect rate.
  • the tire also includes: a rubber reinforcement 500, which is arranged at The carcass reinforcement 300 and the sidewall 200 are formed along the circumferential direction.
  • the radial height KB of the upper end of the rubber reinforcement 500 is less than or equal to 40% of the overall radial height H of the tire.
  • the radial height KA of the apex 410 is greater than or equal to 7% of the overall radial height H of the tire and less than or equal to 15% of the overall radial height H of the tire.
  • the radial height KD of the lower end of the spigot rubber 220 is greater than or equal to 18% of the overall radial height H of the tire and less than or equal to 30% of the overall radial height H of the tire.
  • the radial height KC of the upper end of 220 is greater than or equal to 20% of the overall radial height H of the tire and less than or equal to 35% of the overall radial height H of the tire.
  • the embodiment of the present invention provides a method for improving the unevenness of a tire, which includes: a tire, wherein a carcass cord is arranged inside the tire, and the carcass cord is arranged inside the crown of the tire; the method includes : Step S1: Select the sample, select the carcass cord on the fabric surface; Step S2: Adjust the temperature of the oven, adjust the constant temperature inside the oven to 100 °C-200 °C; Step S3: Carry out the thermal cycle treatment, the oven After the internal temperature rises to the specified temperature, put the sample into the oven for thermal cycle, the thermal cycle time is 5min-30min; Step S4: Measure and calculate the free shrinkage rate, the cord in the free state is heat treated for a specified time After that, measure the sample and calculate its free shrinkage rate; Step S5: Tensile test, perform a tensile test on the sample after thermal cycling treatment, so as to detect the yield strength, tensile strength and elongation of the sample Step S6: Calculate the elongation under
  • the method for improving the tire unevenness is reasonable in design, simple to use and easy to operate, through the performance of the cord under vulcanization high temperature conditions Control to improve tire unevenness.
  • the tire carcass cord When the tire is inflated, the tire carcass cord is in a state of expansion and stress, the carcass cord has high dimensional stability, and the tire is not prone to unevenness problems.
  • the present invention ensures that the carcass cord is routinely tested In addition to dimensional stability, it provides a high-temperature free shrinkage detection and control method for carcass cords to ensure that the carcass cords maintain high dimensional stability under normal temperature and high-temperature vulcanization.

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Abstract

本发明涉及轮胎技术改善技术领域，公开了一种改善轮胎凹凸不良的方法，包括如下操作步骤：步骤S1：选取样件；步骤S2：调节烘箱温度；步骤S3：进行热循环处理；步骤S4：测量并计算自由收缩率；步骤S5：拉伸测试；步骤S6：计算定负荷伸长率，该改善轮胎凹凸不良的方法设计合理，使用方法简单便于操作，通过对帘线在硫化高温条件下的性能管控，从而改善轮胎凹凸度不良，当轮胎充气时，轮胎胎体帘线处于膨胀受力状态，胎体帘线尺寸稳定性高，轮胎不易出现凹凸问题，本发明在确保胎体帘线常规检测尺寸稳定性能的同时，通过提供一种胎体帘线高温自由收缩检测及管控方法，确保胎体帘线在常温及高温硫化下，均保持较高的尺寸稳定性。

Description

一种改善轮胎凹凸不良的方法 技术领域
本发明提供一种改善轮胎凹凸不良的方法，具体涉及到一种控制轮胎所用胎体帘线高温性能的方法。
背景技术
现代半钢子午线轮胎的胎体多为纤维帘线覆胶，经裁断机裁断裁成固定长度而成。在轮胎成型时，单层胎体帘线绕成型鼓一圈后搭接，搭接处为两层帘布，相较于其他部位较厚，轮胎在接头处易出现凹凸不良问题。通常地，轮胎企业控制凹凸不良的方法是增加轮胎胎侧胶料的厚度，来减弱凹凸对人们的视觉效果。而对于引起凹凸度问题最直接的帘线检测，轮胎企业通常均是按照国标中对轮胎用聚酯浸胶帘子布要求进行，其中控制帘线尺寸稳定性的指标，负荷伸长率测量方法为在常温下进行拉伸测量实验。
近年来，随着汽车行业的飞速发展，汽车行业对轮胎的质量要求也越来越高。轮胎的凹凸度与轮胎的安全性直接相关。轮胎凹凸度不良的轮胎在经过马路牙子或者发生碰撞时，轮胎易导致帘线断裂，引发安全事故，因此各轮胎企业均在寻求改进轮胎凹凸度的方法，1、但是现有的改善方法大多增加轮胎胎侧胶料的厚度来改善轮胎凹凸度，必然会导致轮胎的生产成本增加，并且会影响轮胎的舒适性等性能，2、轮胎通常会经过一定时间的高温硫化阶段，对于直接造成轮胎凹凸度问题的帘线通常仅是检测常温下的伸长率，缺乏必要的高温性能检测手段。
发明内容
本发明所提供的一种改善轮胎凹凸不良的方法，以解决现有的改善方法大多增加轮胎胎侧胶料的厚度来改善轮胎凹凸度，必然会导致 轮胎的生产成本增加，并且会影响轮胎的舒适性等性能，轮胎通常会经过一定时间的高温硫化阶段，对于直接造成轮胎凹凸度问题的帘线通常仅是检测常温下的伸长率，缺乏必要的高温性能检测手段的问题。
为了达到上述的效果，本申请提供一种改善轮胎凹凸不良的方法，包括：轮胎，所述轮胎内部设置有胎体帘线，所述胎体帘线设置于轮胎胎冠内部；
所述方法包括：
步骤S1：选取样件，在帘布布面上选取胎体帘线；
步骤S2：调节烘箱温度，将烘箱内部的恒定温度调节至100℃-200℃；
步骤S3：进行热循环处理，将烘箱内部温度升高至制定温度后，将样件放入至烘箱内进行热循环，热循环时间为5min-30min；
步骤S4：测量并计算自由收缩率，自由状态下的帘线经过规定时间的热处理后，对样件进行测量并计算其自由收缩率；
步骤S5：拉伸测试，对热循环处理后的样件进行拉伸测试，从而对样件的屈服强度、抗拉强度以及延伸率进行检测；
步骤S6：计算定负荷伸长率，对样件的定负荷伸长率进行计算。
优选的，所述步骤S1中在帘布布面上选取胎体帘线，选取原则为每隔10cm至20cm的幅宽内选取样件，选取十根样件，且样件规格不短于50cm；
优选的，所述步骤S2中将烘箱内部的恒定温度选取185℃。
优选的，所述步骤S3中将烘箱内部温度升高至制定温度后，将样件放入至烘箱内进行热循环，静置时间选取15min。
优选的，自由收缩率的计算以十根试样测试值的算术平均值表示测定结果，样品初始长度为L0，样品自由收缩后大的长度为L1，单根帘线自由收缩率FS表示为：
Figure PCTCN2021110136-appb-000001
优选的，所述轮胎包括：胎冠100、胎侧200、胎体增强件300以及胎圈400；
所述胎冠100包括胎面橡胶层和胎冠100增强件，所述胎侧200从胎圈400径向向外延伸至胎冠100，所述胎圈400与安装轮辋相接触，所述胎体增强件300围绕在环形钢丝增强结构上从而锚固在每一个胎圈400上。
优选的，所述轮胎除公知的胎圈钢丝420、三角胶410、胎侧胶210、子口护胶220等常规结构外，还包括：橡胶增强件500，所述橡胶增强件500设置于所述胎体增强件300以及胎侧200之间，并沿周向形成。
优选的，所述橡胶增强件500的上部端点的径向高度KB小于或等于轮胎整体径向高度H的40％。
优选的，所述三角胶410的径向高度KA大于或等于轮胎整体径向高度H的7％且小于或等于轮胎整体径向高度H的15％。
优选的，所述子口护胶220下部端点的径向高度KD大于或等于轮胎整体径向高度H的18％且小于或等于轮胎整体径向高度H的30％，所述子口护胶220上部端点的径向高度KC大于或等于轮胎整体径向高度H的20％且小于或等于轮胎整体径向高度H的35％。
本发明所提供的一种改善轮胎凹凸不良的方法，包括：轮胎，所述轮胎内部设置有胎体帘线，所述胎体帘线设置于轮胎胎冠内部；所述方法包括：步骤S1：选取样件，在帘布布面上选取胎体帘线；步骤S2：调节烘箱温度，将烘箱内部的恒定温度调节至100℃-200℃；步骤S3：进行热循环处理，将烘箱内部温度升高至制定温度后，将样件放入至烘箱内进行热循环，热循环时间为5min-30min；步骤S4：测量并计算自由收缩率，自由状态下的帘线经过规定时间的热处理后，对样件进行测量并计算其自由收缩率；步骤S5：拉伸测试，对热循环处理后的样件进行拉伸测试，从而对样件的屈服强度、抗拉强度以及延伸率进行检测；步骤S6：计算定负荷伸长率，对样件的定负荷伸长率进行计算，该改善轮胎凹凸不良的方法设计合理，使用方法简单便于操作，通过对帘线在硫化高温条件下的性能管控，从而改善轮胎凹凸度不良，当轮胎充气时，轮胎胎体帘线处于膨胀受力状态，胎体帘线尺 寸稳定性高，轮胎不易出现凹凸问题，本发明在确保胎体帘线常规检测尺寸稳定性能的同时，通过提供一种胎体帘线高温自由收缩检测及管控方法，确保胎体帘线在常温及高温硫化下，均保持较高的尺寸稳定性。
附图说明
图1是本发明实施例的轮胎径向截面图；
图2是本发明图1的实施例定位解释图；
图3是本发明实施例中前后生产的轮胎凹凸度测试结果；
图4是本发明实施例中T145/90R1实施前后发生率结果对比；
图5是现有技术的轮胎径向截面图。
图中，100、胎冠；200、胎侧；210、胎侧胶；220、子口护胶；300、胎体增强件；400、胎圈；410、三角胶；420、胎圈钢丝；500、橡胶增强件。
具体实施方式
下面结合附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明，但不用来限制本发明的范围。
下面结合附图对本发明进行具体描述，如图1-5所示，一种改善轮胎凹凸不良的方法，在具体实施过程中，依照以下步骤验证及改进胎体帘线高温性能的方法：步骤S1：在帘布布面上选取胎体帘线，选取原则为每隔10cm至20cm的幅宽内选取样件，步骤S2：将烘箱内部的恒定温度调节至100℃-200℃，步骤S3：将烘箱内部温度升高至制定温度后，将样件放入至烘箱内进行热循环，热循环时间为5min-30min，步骤S4：自由状态下的帘线经过规定时间的热处理后，对样件进行测量并计算其自由收缩率，步骤S5：对热循环处理后的样件进行拉伸测试，从而对样件的屈服强度、抗拉强度以及延伸率进行检测，步骤S6：对样件的定负荷伸长率进行计算，其中，步骤S1中在帘布布面上选取胎体帘线，选取原则为每隔10cm至20cm的幅宽内选取样件，选取十 根样件，且样件规格不短于50cm，步骤S2中将烘箱内部的恒定温度选取185℃，步骤S3中将烘箱内部温度升高至制定温度后，将样件放入至烘箱内进行热循环，静置时间选取15min。
自由收缩率的计算以十根试样测试值的算术平均值表示测定结果，样品初始长度为L0，样品自由收缩后大的长度为L1，单根帘线自由收缩率FS表示为：
Figure PCTCN2021110136-appb-000002
根据说明书附图1-5可知，依照上述方法改善的一种轮胎包括：胎冠100、胎侧200、胎体增强件300以及胎圈400；
胎冠100包括胎面橡胶层和胎冠100增强件，胎侧200从胎圈400径向向外延伸至胎冠100，胎圈400与安装轮辋相接触，胎体增强件300围绕在环形钢丝增强结构上从而锚固在每一个胎圈400上。
综上，总体可知，在使用的时候，通过管控帘线高温性能，从而改善轮胎凹凸不良的方法，其原理为利用热循环烘箱，在恒定温度的热空气中，自由状态下的帘线经过规定时间的热处理后，测量并计算其自由收缩率，之后再进行拉伸测试并计算其定负荷伸长率，二者之和即为帘线在自由收缩条件下的尺寸稳定性指数，其中，轮胎凹凸度测试结果数值越小，则表示性能越好，T145/90R1实施前后发生率结果对比中，数值越小，则表示不良率越低。
作为优选方案，更进一步的，轮胎除公知的胎圈400钢丝、三角胶410、胎侧200胶、子口护胶220等常规结构外，还包括：橡胶增强件500，橡胶增强件500设置于胎体增强件300以及胎侧200之间，并沿周向形成。
作为优选方案，更进一步的，橡胶增强件500的上部端点的径向高度KB小于或等于轮胎整体径向高度H的40％。
作为优选方案，更进一步的，三角胶410的径向高度KA大于或等于轮胎整体径向高度H的7％且小于或等于轮胎整体径向高度H的15％。
作为优选方案，更进一步的，子口护胶220下部端点的径向高度KD大于或等于轮胎整体径向高度H的18％且小于或等于轮胎整体径向 高度H的30％，子口护胶220上部端点的径向高度KC大于或等于轮胎整体径向高度H的20％且小于或等于轮胎整体径向高度H的35％。
综上，本发明实施例提供一种改善轮胎凹凸不良的方法，其包括：轮胎，所述轮胎内部设置有胎体帘线，所述胎体帘线设置于轮胎胎冠内部；所述方法包括：步骤S1：选取样件，在帘布布面上选取胎体帘线；步骤S2：调节烘箱温度，将烘箱内部的恒定温度调节至100℃-200℃；步骤S3：进行热循环处理，将烘箱内部温度升高至制定温度后，将样件放入至烘箱内进行热循环，热循环时间为5min-30min；步骤S4：测量并计算自由收缩率，自由状态下的帘线经过规定时间的热处理后，对样件进行测量并计算其自由收缩率；步骤S5：拉伸测试，对热循环处理后的样件进行拉伸测试，从而对样件的屈服强度、抗拉强度以及延伸率进行检测；步骤S6：计算定负荷伸长率，对样件的定负荷伸长率进行计算，该改善轮胎凹凸不良的方法设计合理，使用方法简单便于操作，通过对帘线在硫化高温条件下的性能管控，从而改善轮胎凹凸度不良，当轮胎充气时，轮胎胎体帘线处于膨胀受力状态，胎体帘线尺寸稳定性高，轮胎不易出现凹凸问题，本发明在确保胎体帘线常规检测尺寸稳定性能的同时，通过提供一种胎体帘线高温自由收缩检测及管控方法，确保胎体帘线在常温及高温硫化下，均保持较高的尺寸稳定性。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和替换，这些改进和替换也应视为本发明的保护范围。

Claims (10)

  1. 一种改善轮胎凹凸不良的方法，其特征在于，包括：轮胎，所述轮胎内部设置有胎体帘线，所述胎体帘线设置于轮胎胎冠内部；
    所述方法包括：
    步骤S1：选取样件，在帘布布面上选取胎体帘线；
    步骤S2：调节烘箱温度，将烘箱内部的恒定温度调节至100℃-200℃；
    步骤S3：进行热循环处理，将烘箱内部温度升高至制定温度后，将样件放入至烘箱内进行热循环，热循环时间为5min-30min；
    步骤S4：测量并计算自由收缩率，自由状态下的帘线经过规定时间的热处理后，对样件进行测量并计算其自由收缩率；
    步骤S5：拉伸测试，对热循环处理后的样件进行拉伸测试，从而对样件的屈服强度、抗拉强度以及延伸率进行检测；
    步骤S6：计算定负荷伸长率，对样件的定负荷伸长率进行计算。
  2. 根据权利要求1所述的一种改善轮胎凹凸不良的方法，其特征在于，所述步骤S1中在帘布布面上选取胎体帘线，选取原则为每隔10cm至20cm的幅宽内选取样件，选取十根样件，且样件规格不短于50cm。
  3. 根据权利要求1所述的一种改善轮胎凹凸不良的方法，其特征在于，所述步骤S2中将烘箱内部的恒定温度选取185℃。
  4. 根据权利要求1所述的一种改善轮胎凹凸不良的方法，其特征在于，所述步骤S3中将烘箱内部温度升高至制定温度后，将样件放入至烘箱内进行热循环，静置时间选取15min。
  5. 根据权利要求1所述的一种改善轮胎凹凸不良的方法，其特征在于，自由收缩率的计算以十根试样测试值的算术平均值表示测定结果，样品初始长度为L0，样品自由收缩后大的长度为L1，单根帘线自由收缩率FS表示为：
    Figure PCTCN2021110136-appb-100001
  6. 根据权利要求1所述的一种改善轮胎凹凸不良的方法，其特征在于，所述轮胎包括：胎冠(100)、胎侧(200)、胎体增强件(300)以及胎圈(400)；
    所述胎冠(100)包括胎面橡胶层和胎冠(100)增强件，所述胎侧(200)从胎圈(400)径向向外延伸至胎冠(100)，所述胎圈(400)与安装轮辋相接触，所述胎体增强件(300)围绕在环形钢丝增强结构上从而锚固在每一个胎圈(400)上。
  7. 根据权利要求6所述的一种改善轮胎凹凸不良的方法，其特征在于，所述环形钢丝增强结构包括胎圈钢丝(420)以及三角胶(410)，所述胎侧(200)包括胎侧胶(210)以及子口护胶(220)。
  8. 根据权利要求6所述的一种改善轮胎凹凸不良的方法，其特征在于，还包括：橡胶增强件(500)，所述橡胶增强件(500)设置于所述胎体增强件(300)以及胎侧(200)之间，并沿周向形成。
  9. 根据权利要求6所述的一种改善轮胎凹凸不良的方法，其特征在于，所述橡胶增强件(500)的上部端点的径向高度KB小于或等于轮胎整体径向高度H的40％，所述三角胶(410)的径向高度KA大于或等于轮胎整体径向高度H的7％，且小于或等于轮胎整体径向高度H的15％。
  10. 根据权利要求6所述的一种改善轮胎凹凸不良的方法，其特征在于，所述子口护胶(220)下部端点的径向高度KD大于或等于轮胎整体径向高度H的18％且小于或等于轮胎整体径向高度H的30％，所述子口护胶(220)上部端点的径向高度KC大于或等于轮胎整体径向高度H的20％且小于或等于轮胎整体径向高度H的35％。
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