影响物理发泡绝缘熔体强度的因素

合适的熔体强度始终是取得良好发泡效果的关键.讨论了影响塑料熔体强度的因素及其与发泡参数的相互关系,为今后的工艺改进提供了依据.     

物理高发泡绝缘材料的探讨

聚乙烯的材质对高发泡绝缘性能的影响较大。本文叙述了不同材料的试验情况，分析了对物理高发泡绝缘材料的性能要求，介绍了国内新开发的ＣＴ－１型电视电缆绝缘料。     

氟塑料发泡线缆工艺设备技术发展综述

论述了高端通信线缆产品市场对发泡氟塑料线缆的需求,以及国际上对氟塑料发泡技术研发进展与成果.综述了氟塑料发泡树脂种类、性能和用途.通过对发泡氟塑料线缆产品工艺与设备开发试验过程的回顾,总结了国际上高端设备供应商的先进关键工艺技术设备及配置细节,以期为发泡氟塑料线缆产品研发人员深入掌握相关工艺技术设备提供关键原则性指导.     

大规格射频同轴电缆的物理发泡绝缘二次挤塑

介绍大规格射频同轴电缆物理发泡绝缘二次挤塑的优点和挤塑过程的关键工艺参数控制.     

高密度聚乙烯塑料激光焊接工艺参量试验研究

为了研究激光焊接中各工艺参量对高密度聚乙烯塑料焊接件性能的影响,采用激光穿透焊接高密度聚乙烯试样件,进行了力学拉伸试验并应用扫描电镜观测其焊缝断口的形貌.试验结果表明,当光斑直径为2mm、激光功率为75W、焊接速度为2mm/s时,焊接件断口没有飞边和夹渣,焊接接头成型良好,力学性能最佳:随着激光光斑直径的减小、焊接速度的降低或功率的增加,接头强度及伸长率均有提高.进一步从激光体能量角度分析了影响接头强度的因素,证实了激光焊接高密度聚乙烯是一种可行的方法.     

高密度聚乙烯塑料激光焊接工艺参量试验研究

为了研究激光焊接中各工艺参量对高密度聚乙烯塑料焊接件性能的影响,采用激光穿透焊接高密度聚乙烯试样件,进行了力学拉伸试验并应用扫描电镜观测其焊缝断口的形貌。试验结果表明,当光斑直径为2mm、激光功率为75W、焊接速度为2mm/s时,焊接件断口没有飞边和夹渣,焊接接头成型良好,力学性能最佳;随着激光光斑直径的减小、焊接速度的降低或功率的增加,接头强度及伸长率均有提高。进一步从激光体能量角度分析了影响接头强度的因素,证实了激光焊接高密度聚乙烯是一种可行的方法。     

对国产大型挤塑机的改进

在生产过程中发现了国产大型挤塑机存在的问题 ,对造成问题的原因进行了分析 ,并提出了改进意见。设计和改进后的该国产大型挤塑机能满足线缆制造工艺要求。     

不同极性聚合物材料的THz-TDS光谱测量研究

为探讨聚合物分子的极性对其介电性质的影响,采用太赫兹时域光谱研究了5种聚合物材料,高密度聚乙烯、聚对苯二甲酸乙二醇酯、聚氨酯、聚偏氟乙烯和聚乙烯吡咯烷酮在太赫兹波段的吸收色散性质,并尝试采用De-bye模型对实验结果进行了理论分析.研究发现,聚合物的偶极弛豫运动随极性的增强而加剧,导致吸收系数(α)、介电常数虚部(ε")和弛豫强度(△ε)均随之增大;由于弛豫运动受介质阻尼的影响落后于太赫兹电场的周期性变化,折射率(n)和介电常数实部(ε')呈现反常的色散现象,即n和ε随频率的增大而降低;Debye模拟结果还表明弛豫时间(T)随偶极子尺寸的增大和分子刚性的增强而显著增大.     

用于微同轴，同轴和数据电缆绝缘的氟塑料挤塑

罗森泰从事氟塑料挤塑技术已有30多年,制造过很多高效率的整套氟塑料绝缘和护套生产线.罗森泰可以提供各种高性能实心和发泡芯线的专业氟塑料挤塑生产线.     

用于微同轴，同轴和数据电缆绝缘的氟塑料挤塑

罗森泰从事氟塑料挤塑技术已有30多年,制造过很多高效率的整套氟塑料绝缘和护套生产线.罗森泰可以提供各种高性能实心和发泡芯线的专业氟塑料挤塑生产线.     

Nanocellulose Aerogels for Supporting Iron Catalysts and In Situ Formation of Polyethylene Nanocomposites

Aerogels of nanocellulose (NC) prepared by freeze‐drying of cellulose nanofibrils (CNF) hydrogels and followed by impregnation with methylaluminoxane serve as nanoporous organic supports for immobilizing single site iron catalysts such as bisiminopyridine iron(II) complexes. The resulting catalyst systems, exploiting renewable biomaterials as organic supports, are highly active in low pressure ethylene polymerization. They afford simultaneous control of high density polyethylene (HDPE) particle morphology and facile NC dispersion within the HDPE matrix. In the early stage of ethylene polymerization, mesoscopic shape replication and NC‐mediated templating yield platelets containing an NC core and a HDPE shell, as confirmed by scanning electron microscopy (SEM) of virgin polyethylene powders. Opposite to conventionally dried CNF hydrogels, forming large agglomerates, this facile NC aerogel‐mediated in situ NC/HDPE nanocomposite formation is vastly superior to melt compounding of HDPE with NC, failing to produce such fine NC dispersions. On increasing NC content to 3.0 wt%, both Young's modulus (+50%) and tensile strength (+40%) increase at the expense of elongation at break (?80%). According to the SEM analysis of NC/HDPE morphology, the dispersion of NC nanosheets together with the in situ formation of “shish‐kebab” polyethylene fiber‐like structures accounted for HDPE matrix reinforcement.     

整体型微孔聚四氟乙烯绝缘工艺初探

介绍了整体型微孔聚四氟乙烯绝缘推挤工艺的加工设备和工艺原理,阐述了对该工艺的初步探索结果,着重分析了工艺过程中的几个重要因素.选择合适的聚四氟乙烯树脂和挤出助剂以及对原材料正确的预处理是获得优质微孔聚四氟乙烯绝缘的前提.模具设计和配置会对工艺产生重大影响.根据电缆设计要求的等效介电常数计算出所需要的拉伸速度比的计算方法...     

聚全氟乙丙烯（FEP）物理发泡绝缘同轴电缆设计制造技术探讨

本文介绍了聚全氟乙丙烯（FEP）物理发泡绝缘同轴电缆的结构设计特点及开发要点。阐述了聚全氟乙丙烯（FEP）物理发泡绝缘同轴电缆制造工艺及关键技术，对氟塑料物理发绝缘挤出进行了重点论述，最后简述了该电缆的测试结果，以供同行借鉴及探讨。     

通信线缆业资源循环实践中的若干技术问题

本文从大、中、小三个层次探讨了线缆业的资源循环.介绍了如何在线缆设计和制造中运用资源循环的基本原则,如何在制造过程中节约资源、利于线缆料循环使用.分析了与回收废旧通信线缆中铜线、聚乙烯护套科和PVC护套料有关的技术问题.以多晶硅和石英光纤的联动制备项目为例,说明不同产业的生产过程能够有机地组合起来,实现整个社会层次的物质流的闭环.     

The installation of conventional fiber-optic cables in conduitsusing the viscous flow of air

A technique using air to push fiber-optic cables makes it possible to install them in cheap HDPE (high-density polyethylene) ducts with an inner diameter of 26 mm, in spite of the tortuosity of the latter. An estimation of a convenient cable stiffness, based on conduit geometry and cable properties, is derived. When one installation unit (cablejet) is used, cables with a maximum length of 800 m can be installed with speeds up to 60 m/min. Even 36 right-angles curves in the conduit do not prevent the cable from going on. In less than one hour, 2000 m can be installed using the cablejets in cascade. So far, more than 150 km of fiber-optic cable have been installed in the public network in the Netherlands using the described method, resulting in considerable saving of time and labor     

Application of submillimeter wave lasers to high voltage cable inspection

An experimental device designed for real-time, nondestructive inspection of cross-linked polyethylene insulation during cable manufacture has been built, analyzed, and tested under laboratory conditions. The device detects scattered far-infrared (FIR) laser energy at 118.8 μm from imperfections, such as voids and contaminants, known to have a serious deleterious influence on cable in-service lifetime. As presently configured, the device can readily detect voids as small as 100 μm in diameter in a cable 2.8 cm in diameter moving past the sensor at 5 cm/s. Better performance of the liquid helium cooled Ga-doped Ge detectors could lead to a significant improvement in void detection capability.     

聚乙烯/蒙脱土纳米复合材料的研制

采用熔融插层复合法制备了一种新型的电（光）缆护套料——聚乙烯／蒙脱土纳米复合材料。傅里叶变换红外光谱（FTIR）测试表明，有机阳离子已和蒙脱土中的钠离子发生了交换作用，X射线衍射（XRD）测试表明聚乙烯已经进入到蒙脱土片层间，形成了插层型纳米复合材料。测试了复合材料的热学性能和力学性能，试验表明聚乙烯／蒙脱土纳米复合材料比传统的聚乙烯护套料在耐热性能和力学性能等方面均有显著提高。     

ADSS光缆电腐蚀问题的浅析

近年来ADSS光缆已成为110 kV及以下电力通信的首选光通信传输介质。ADSS光缆具有绝缘良好,抗拉强度高,可与电力线同杆塔架设等优点,但存在着易电腐蚀等缺陷。对ADSS光缆产生电腐蚀的原因和控制方法作了详细的阐述,并通过一个ADSS光缆电腐蚀案例的分析,讨论了ADSS光缆产生电腐蚀的必要条件和预防方法,证明了ADSS光缆的电腐蚀在110 kV及以下的电压等级上是可以控制的,ADSS光缆是可以安全运行的。     

FEP绝缘5类数据电缆的设计和生产

介绍5类缆的发展趋势，聚合氟乙丙烯（FEP）绝缘5类数据电缆的结构设计，材料性能，工艺及模具设计，传输性能和阻燃性能，烟密度的测试。     

Interfacial Reaction Enhanced Liquid-Phase Sintering of Metal/Oxide Soft Magnetic Composite

Soft magnetic composites (SMCs) are ungently demanded in high-frequency power electronics for their large magnetization and high electrical resistivity. However, traditional cold-pressed SMCs are faced with low mechanical strength and insulation instability, which severely restricts their applications. In this study, liquid-phase sintering techniques to prepare FeSiAl/MoO₃ SMCs are orginally employed, where consolidation and insulation of metallic magnetic particles are achieved in one step. The redox reaction between FeSiAl and MoO₃ melt greatly reduces the interfacial energy, facilitates fully wetting of FeSiAl particles by MoO₃ melt, and promotes the densification process during sintering. In the final FeSiAl/MoO₃ SMC, FeSiAl particles are bonded covalently and insulated electrically/magnetically by the resultant Al₂O₃ transition layer, endowing the SMC with high crushing strength of 250 MPa, cut-off frequency of 110 MHz, permeability of 35 (@1 MHz), and low power loss of 962 kW m⁻³ (5 MHz, 5 mT). This study provides alternative concept for designing new SMCs, and broadens the connotation and extension of liquid-phase sintering.