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聚乙烯管道系统的连接技术问题(1) 总被引:2,自引:1,他引:2
介绍了各种聚乙烯管道系统的连接技术。连接常是管道系统成败的关键,各种连接技术都有其适用的范围。聚乙烯压力管道的连接以熔接为主,但有些场合需要机械密封连接。在聚乙烯的机械密封连接中特别要注意聚乙烯容易蠕变的特性。有些适用于聚氯乙烯管道的连接方法和设计不适用于聚乙烯管道。聚乙烯无压力管道的连接也有多种方法,要根据对于密封的要求选择。介绍了国内外为解决聚乙烯双壁波纹管承口刚度问题采用的种种做法。简介了交联聚乙烯管道和增强聚乙烯管道的特殊连接技术。提出在聚乙烯管道系统的连接方面希望国内外科技界关注的几个重要研究课题。 相似文献
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树脂基复合材料的连接包括复合材料之间的连接以及与金属之间的连接,其工艺比金属材料之间的连接更为复杂。本文分别介绍了机械连接、胶接、缝合连接、Z-pin连接和混合连接等连接技术的工作原理、连接特点,并比较了这几种连接技术的优缺点。结果表明,在树脂基复合材料连接工艺中,机械连接技术成熟,运用最广泛,混合连接是机械连接的拓展,缝合连接和Z-pin连接常作为辅助连接,胶接技术逐渐成熟,各种连接的使用有相应的条件和要求,故连接性能的好坏涉及很多因素,较为复杂。 相似文献
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概述了塑料制品的各种机械连接方法及其特点,适用范围和发展概况。重点介绍了自攻螺钉连接、模塑后嵌入的嵌件连接,卡入连接等较新的连接技术。 相似文献
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聚乙烯管具有重量轻.耐腐蚀.卫生性好和低温韧性突出等诸多优点,因而在输水和输送燃气领域应用广泛。为了确保使用的安全可靠性,聚乙烯管道的连接工艺较为严格,需要使用专用的工具设备,而且施工人员必须具备焊接上岗资格,规范的施工不仅能够保证管道的连接质量,而且可避免各种管道事故的发生。 相似文献
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The mechanical properties of adhesively bonded MDPE joints were studied. The lap-shear joints were prepared using PE80 polyethylene gas pipe and four adhesive types; two acrylic and two epoxy resins. The key mechanical properties of lap shear strength and impact resistance were investigated as a function of adhesive type and surface preparation technique. Mechanical abrasion of the PE80 surface increased the strength of the bonds from 40 to 460% for the four adhesives, with the best performing acrylic adhesive having a lap-shear strength of 1.76 MPa and impact strength of 2.5 kJ/m2. When used to bond PE80 tapping tees to PE80 gas pipe, the acrylic adhesive produced a gas tight seal at both the standard test pressure of 0.4 MPa and at an increased pressure of 0.8 MPa, and outperformed the PE80 tapping tee during shear testing and withstood a maximum of 10 cycles of 175 J during impact testing. These results highlight the potential of adhesive bonding as a method of joining PE80 tapping tees to PE80 gas pipe. 相似文献
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S. M. Pimputkar 《Polymer Engineering and Science》1989,29(19):1387-1395
The integrity of a pipeline system is determined by its weakest links. Joints may be such places. Heat fusion is the most common joining method for distribution gas piping. There are procedural, thermal, and mechanical aspects of making fusion joints. Procedural aspects, such as heater calibration and cleanliness, can be assured only by rigorous training and certification of the operators. Thermal and mechanical aspects consist of specifying joining conditions such as the heater temperature, heating time, and joining pressure. In the absence of procedural errors, the strength of a fusion joint should depend on the pipe material, pipe dimensions, and the thermal and mechanical joining conditions. The measured parameters that are measures of strength are impact energy and location of failure in the tensile impact test. A parameter, termed the joining parameter, was found to characterize the joining conditions. This parameter is a function of bead volume, melt volume at the end of the heating phase, and pipe wall thickness. Of the mechanical test parameters, the impact energy was found to correlate best with the joining parameter. 相似文献
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介绍了各个应用领域塑料管道系统近年技术发展的新动向。PVC-M能显著提高韧性又可以节约材料,为聚氯乙烯压力管道系统的发展开拓了新机遇。聚乙烯管道系统在不开挖铺设和水中铺设等领域应用日益广泛。各种增强复合管道系统成为发展的热点。毛细管垫表面调温系统等有利环境保护的新技术扩大了建筑内塑料管道系统的市场。 相似文献