气相防锈塑料薄膜关键技术

阐述了气相防锈塑料薄膜的发展历史，并介绍了使用形式、应用领域、制造方法和生产过程中存在的问题，技术指标，以及目前该产品在国内外的标准情况。     

气相防锈纸及气相防锈塑料薄膜

气相防锈纸一般是：表面印刷或反印刷聚乙烯薄膜／纸(各种规格的各种纸张均可)，含有气相防锈剂的水溶性乳胶涂布层。也可以把气相防锈剂掺混入EVA树脂中，在150～160℃温度下挤出流延在纸片的内层面上，同纸复合后形成气相防锈纸，这时的EVA还可以热封制袋。     

气相防锈无纺布

介绍了新一代气相缓蚀剂包装材料气相防锈无纺布的特点及其应用的研究。     

气相防锈塑料包装：一门新兴技术

凡金属制品都面临着腐蚀问题，人们一直在为防腐而奋斗，也找到了各种防腐蚀方法。如电镀、浸涂、真空包装、油臻、涂油等。但是，有些金属产品不宜用上述方法，所以人们研究采用气相防锈方法．对此。美国、日本、前苏联已研究20多年。气相防锈塑料包装在世界商品化流行则是近五年的事情。但国内研究成功并形成商品化生产的非常少。     

气相防锈塑料薄膜的发展趋势及改进方向

从国内外主要生产企业和金属防锈包装领域客户需求两方面分析气相防锈塑料薄膜产品的发展趋势,介绍了国内气相防锈膜产品现状,提出未来技术发展改进方向。     

功能性薄膜之二——防锈薄膜

气相防锈技术是以应用气相防锈剂为基础的一种新的防锈技术。气相防锈剂,简称VCI（VolatileCorrosionlnhibitor）,气相防锈剂亦称气相缓蚀剂,简称VPI（VaporPhase lnhibitor）。防锈薄膜又称气相防锈薄膜,是为金属防锈而开发的一种功能性薄膜。要较好地认识防锈薄膜,这里先介绍一下金属的锈蚀和气相防锈技术方面的基本知识。     

气相防锈纸的电化学评价研究

为了快速评价防锈纸的性能,采用电化学方法对气相防锈纸涂布液配方进行了研究和改进,介绍了一种气相防锈纸电化学评价的装置,通过双电极叠片大气腐蚀监测(ACM)电池,比较了气相防锈纸的气相缓蚀能力.结果表明,电化学方法与传统的湿热试验评价方法的结果是一致的,可用于分析缓蚀添加剂的作用机理、比较和快速评价气相防锈纸的气相缓蚀能力.     

气相防锈材料中亚硝酸盐含量快速半定量检测方法研究

研究了一种适合于应用现场的气相防锈材料亚硝酸盐含量快速半定量检测方法。亚硝酸盐在弱酸性条件下，与对氨基苯磺酸生成重氮盐，重氮盐再与N，N-二甲基-α-萘胺反应生成红色染料。该红色生成物与配色剂A溶液进行颜色复配，由于亚硝酸盐含量的不同，产生由无色至浅绿色、绿色、靛青色、浅紫色、紫色、紫红色等一系列色阶。亚硝酸盐含量不同，色差极为明显，利用目视比色法可快速判断亚硝酸盐的含量。经与国家标准检测方法对比，本方法的检测结果准确可靠。     

浅谈气相防锈包装技术

气相防锈包装是利用气相缓蚀剂常温下缓慢气化,并以分子或离子形式吸附于金属表面,从而阻隔金属与外界水分、氧气等腐蚀介质的接触,达到防锈的目的。中国每年因腐蚀造成的损失高达2800亿元。因此,如何有效防止金属腐蚀,已成为各种金属相关产品在运输过程中非常关键的因素。气相防锈包装作为一种新兴技术,以其简便实用、安全有效、防锈时期长、应用范围广而受到青睐。特别是气相防锈包装适合于表面不平、结构复杂且多空隙的金属制品更引起越来越多企业的关注。     

汽车零部件气相防锈包装方案优化研究

以某汽车零部件企业的出口产品包装为研究对象,在对原包装方案全面分析的基础上,采用气相防锈包装技术,设计了5 种防锈包装改进方案,制作了相应的包装样品件并对其进行实际海运,以各方案的防锈包装效果与包装成本为依据,分析得到了最优的汽车零部件海运防锈包装方案,降低了包装成本,提高了包装作业效率。     

包装复合薄膜渗透性的模拟分析

分析了食品包装薄膜透气性的测试方法和气体渗透性,并从单层包装材料的渗透性理论导出层合包装材料的渗透系数表达式,并设计了一个计算层合包装材料渗透系数的应用程序,并用单层材料的渗透性数据计算层合包装材料的渗透系数.     

Bag-in-box packaging for wine: Analysis of transport stress in barrier films

This study was conducted on bag-in-box packages for wine to show how the transport stress changes the oxygen permeability of the bags and the possible consequences for the wine's shelf-life. Bags from five leading bag suppliers/film producers were tested. The bags were subjected to two types of transport stress–simulated vibration testing in the laboratory and actual road transport (1000 km) and the same type of corrugated fibreboard box was used throughout. During road transport a red French table wine was used. Emphasis was placed on leakage and O₂ permeability in the investigation of the bags. The study showed no visible bag leakage. Measurement of the O₂ permeability revealed that the bag with an Al-laminated barrier film had the lowest permeability. The ethylene vinyl alcohol (EVOH) bags were more permeable than the Al-laminated bags, while metallized polyester (Met. PET) had the highest O₂ permeability. Chemical analysis of the wine included the measurement of free and total SO₂, oxygen and colour, carried out 1, 4.5 and 9 months after filling. Sensory analysis was carried out as a series of rank order tests performed 5 and 9 months after filling. The chemical and sensory measurements showed small differences between the various bag types. Regarding wine quality, none of the tested bag types distinguished themselves either in a positive or a negative direction in relation to similar table wine stored in glass bottles. The analysis after 9 months of storage showed that none of the wines were oxidized to an unacceptable quality compared to the quality of the same wine stored in glass bottles (not transported) for the same period. The shelf-life of wine is often calculated on the basis of the measured values for oxygen permeability. The theoretical shelf-life of wine is 130-450 days for new bags of Met. PET and 30-130 days for worn (transported) bags. The analysis of the wine showed a longer shelf-life than the theoretical calculations. This is because phenolics, which prevent oxidation, are not accounted for in the formula. The formula is therefore probably best suited for white wines. The selection of barrier material for bag-in-box bags (Met. PET, EVOH or Al-lami-nates) does not seem to be critical for the shelf-life of a red table wine with a rather high content of phenolic components if the wine is stored for less than 9 months.     

Application of ceramic-filled polymeric films for packaging fresh produce

The permeabilities of two commercial ceramic-filled LDPE films were measured and compared with those of a plain LDPE film. The ceramic films have higher oxygen (0₂), carbon dioxide (CO₂) and ethylene (C₂H₄) permeabilities, higher CO₂ to O₂ permeability ratio, and higher C₂H₄ to 0₂ permeability ratio. The temperature dependence of the permeability was found to follow the Arrhenius relationship. The data suggest that these ceramic films are more suitable than plain LOPE film for packaging fresh produce of high respiration rate.     

Knife-edge life in packaging machinery for cross-cutting plastic films

In the cross-cutting of plastic films, the edge life of knives ends when the cutting-edge geometry in the transition zones is deformed to such an extent that a complete separation of the packaging material web is no longer possible. In nine long-term tests under almost field conditions, those knife and machine parameters were investigated that determine the development of these zones. It is shown that longer knife-edge lives can be obtained with high contact pressures, high angles of mesh, low dihedral angles and low cutting speeds. Lateral relative movements of the packaging material web proved to be a distinct improvement. The knife-edge life criterion was determined by the presence of transitional zones of ‘wear’ at the extremes of the cutting zone. The quality of cutting edge and value of cutting pressures do not provide reliable information on the wearing condition of the knives.     

Web服务器的性能测试方法

本文总结并提出了Web服务器性能测试的指标体系,对影响Web服务器性能的主要因素进行了分析。讨论了测试用例选择原则和测试负载的加载方式。针对用户关心的连接速率、并发连接数、并发用户数三个指标的最大值,给出了详细的测试方法。     

牛奶包装黑白膜的研究

牛奶包装黑白膜是一种实用型、经济型和环保型包装.为了更好地研究应用,本文介绍了牛奶包装黑白膜的材料结构、制备工艺以及国内研究现状,同时指出了今后的研究方向.牛奶包装黑白膜研究将朝着基材选取多样化和多种复合工艺相结合的方向发展.     

某大型通讯及办公建筑的空调系统节能诊断与运行优化

通过对大楼中央空调系统的主要设备、典型末端系统能耗、房间舒适度和系统能耗测试,分析现有系统的运行状态、能耗水平和节能效果,测试表明大楼空调系统具有较好的节能性和较高的空调舒适度.同时,实施制冷机房运行优化、变风量自控策略优化和物业节能运行建议,实现大楼更舒适和节能运行,为大型通讯及办公建筑的空调运行提供示范.