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分析半钢子午线轮胎使用早期胎圈周向裂口的产生原因,并采取相应解决措施。通过严控工艺、优化结构设计,使胎圈部位材料过渡平顺,避免应力集中,合理分布胎肩及胎圈应力等措施,有效的解决了胎圈早期周向裂口问题,轮胎耐久性能显著提高。 相似文献
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分析全钢载重子午线轮胎胎圈气泡产生的原因,并提出相应的解决措施。结果表明:通过严格控制半成品质量,改善成型工艺和设备,调整内衬层宽度、级差、边厚和加强层封口胶片定位等,使各部件端点尽量避开胎圈底部,材料分布合理化,取得了较为明显的效果,有效降低了胎圈气泡的发生率。 相似文献
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胎坯刺孔是保证轮胎硫化后不出现气泡和脱层等质量问题必不可少的手段之一。现在国内轮胎厂所用的胎坯刺孔机均只对胎坯冠部、肩部及侧部刺孔,而胎圈部位只靠人工刺孔,劳动强度大,少扎、漏扎等现象时有发生,不易控制刺孔质量。硫化时,内压分布在胎圈内侧部位的压力最低,加上设计增强型轮胎时胎侧部位厚度增大,易使成品轮胎胎侧部位因内压不足产生胎圈气泡等。为提高产品质量和减轻操作人员的劳动强度,对原胎坯刺孔机进行改造,使其不仅可对胎坯冠部、肩部及侧部进行垂直刺孔,还可以对胎圈部位进行刺孔。1原胎坯刺孔机构造LKM-975D轮胎胎坯… 相似文献
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针对子午线轮胎在生产过程中出现的胎圈大、胎圈小、胎圈缺胶或圆角、胎圈裂口、胎圈气泡和胎圈露线等常见质量缺陷进行了原因分析,并提出了相关的解决措施。 相似文献
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本文主要研究全钢载重子午胎成型机各压辊滚压部件参数设定原则,得出结论。成型机滚压参数设定对胎胚外观质量、成品胎气泡(胎圈气泡、胎侧气泡、胎肩气泡和胎冠气泡)、胎体帘布弯曲程度、材料分布和机床耐久力都有较大的影响。根据试验验证,在保证轮胎品质的前提下,合理设定成型机滚压参数。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献
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以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献