八角垫密封的有限元分析

本文针对高压设备八角垫密封结构，利用ＰＡＦＥＣ有限元软件包和ＰＩＧＳ交互图形软件包计算了多种工况下的非定常温度场和热弹性应力，探讨了垫圈密封力与内压、时间的变化关系，从而为密封结构的安全评定和改进工艺操作提供了理论依据。     

光纤束密封工艺研究

介绍了光纤密封工艺,分析了密封光纤束的原理,探讨了光纤束中光纤单丝间、光纤与耦合件间以及耦合件与护套管间的三方面密封工艺方法,通过对三方面密封处理,解决了光纤束的密封问题,由此可见＂采用光纤端面加光导柱,辅以机械密封方法＂是一种相对成熟的密封工艺,并提出了一种光纤束密封性能检测的简易装置。     

电磁感应封口技术的原理及其在塑料包装工程中的应用

在简述了国内塑料包装行业发展现状的基础上,简要介绍了电磁感应封口技术的原理,分析了趋肤效应、邻近效应和圆环效应对电磁感应封口工艺的影响,以接触式密封工艺和非接触式密封工艺为例,分别介绍了电磁感应封口技术在塑料瓶和塑料杯密封工艺中的应用。     

汽车窗密封用热塑性弹性体

德国奔驰 (Ｄａｉｍｌｅｒ Ｂｅｎｚ)汽车公司用美国ＡＥＳ公司热塑性弹性体 (ＴＰＥ)Ｓａｔｏｐｒｅｎｅ密封汽车窗 ,可降低成本和重量 ,用于该公司的Ａ级车型上 ,用Ｓａｎｔｏｐｒｅｎｅ可减少用传统乙丙三元橡胶(ＥＰＤＭ )密封所需部件 ,而且具有极好的密封性和耐臭氧和耐紫外线性 ,从而提高部件总体性能。ＡＥＳ公司和德国最大的玻璃窗密封厂家ＲｉｃｈａｒｄＦｒｉｔｚ有限公司合作开发ＴＰＥ的应用。已有四家玻璃窗公司同意Ｆｒｉｔｚ公司用Ｓａｎｔｏｐｒｅｎｅ橡胶特殊高流动牌号“Ｍ10 0 ”密封。目前汽车工业上采用Ｓａｎｔｏｐ…     

Sterling 2320炭黑

Ｓｔｅｒｌｉｎｇ２３２０炭黑美国《橡胶世界》１９９４年２１１卷２期５６页报道：卡博特公司为要求具有优异热撕裂强度、压缩永久变形和回弹性的密封、胶管和动态减振制品等使用而研制了Ｓｔｅｒｌｉｎｇ２３２０炭黑。据说，Ｓｔｅｒｌｉｎｇ２３２０特别适于代替密封...     

橡胶膜密封干式气柜组装工艺和质量控制

介绍了橡胶膜密封干式气柜的组装工艺和质量控制 ,旨在充分肯定橡胶膜密封干式气柜的优越性和取代水密封湿式气柜及稀油密封干式气柜的必要性     

空调换热器的密封与自动涂胶技术实践研究

空调具有制热和制冷功能，而空调换热器则是空调的核心部件，其密封工艺对换热器非常重要，直接影响到换热器的换热效率。针对密封胶对换热器的换热性能和空调器的性能，分析了空调换热器的密封部件、材料生产和制造工艺，探讨了空调换热器的密封和换热原理，并从产品设计、密封材料、工艺可靠性和自动化等方面进行了研究。结果表明：新开发的空调换热器密封技术应用于空调生产线，提高了工业自动化水平，密封性能可靠。     

机械密封中多相流应用研究进展

机械密封在旋转机械中广泛应用,但由于材料、装配等问题容易引起不同程度的密封失效。本文从表面工程、间隙流动、流固耦合等三个方面阐述了机械密封应用中的多相流问题。这些研究对于解决机械密封失效,完善机械密封失效机理,改善机械密封的制备工艺和装配工艺,具有一定的指导意义。     

浅谈汽车涂装同步工程涂胶密封分析

介绍了新车型产品设计阶段,涂装的涂胶密封工艺同步工程分析内容.结合典型实例,对影响涂胶密封效果、涂胶施工等问题的产品结构提出合理的优化建议,以有效提升车身密封结构的工艺合理性和施工性,也为后续汽车涂装的涂胶密封同步工程分析工作提供借鉴.     

合成氨工艺混合气对螺旋槽干气密封性能的影响

在干气密封的研究时,一般将使用的工艺气体处理为纯气体。虽然干气密封装置系统有干燥和过滤设备,但工艺气体在处理后仍不可避免的含有固体微粒。本文以螺旋槽干气密封应用于合成氨为例,使用Fluent软件对纯气体与含有微粒的工艺气体进行了研究,获得了两者对干气密封性能的影响。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。