蒸煮袋的破袋问题分析及解决方案

19世纪初期，法国人研制出了罐头工艺，用来长期贮藏果蔬。经过200多年的改进和发展，罐头制作工艺愈发纯熟，其包装也从玻璃瓶扩展到金属罐、软罐等多种形式。虽然玻璃瓶和金属罐都具有非常好的密封性、阻湿性和保香性，但由于其热传导速率慢、空间占用率高等影响生产和运输效率的缺陷，现在已经逐渐被软罐包装所取代。     

加油站埋地双壁罐的结构与系统分析

双壁罐具有防腐性能好、寿命长、免维护、自重轻等优点，目前已经开始在国内得到应用，文章结合苏州金园加油站实例，详细分析了埋地双壁罐的结构特点、渗漏监测以及应用分析，并对加油站安全使用提出了几点看法。     

大口径HDPE缠绕管在排水管道工程中的应用

分析高密度聚乙烯（HDPE）双壁缠绕管的特性，探讨了HDPE双壁缠绕管在排水管道工程施工过程中应用的技术要求和注意事项，以达到降低成本、缩短工期，并在施工过程中减少对周边环境的影响。     

金属罐用水性烘漆

金属罐用水性烘漆马口铁、钢、铝等制成的饮料、食品等金属罐，通常在金属板上直接或在底漆上涂覆白底漆，然后实施图案、文字等印刷，再涂覆透明装饰清漆。作为装饰清漆现采用溶剂型清漆。曾用丙烯酸树脂水分散体清漆，产生结皮，凝集粒子不溶化，不可避免地会污染装置，...     

聚丙烯树脂在大口径双壁波纹管中的应用

主要介绍了双壁波纹管及其所用材料的种类并对它们进行了分析比较，重点介绍了聚丙烯树脂在大口径双壁波纹管上的应用优势。     

关于用全站仪内部测量球形金属罐容量的方法

介绍了用全站仪测量球形金属罐容量的方法,包括赤道内直径的测量,竖向内直径的测量、液位计标尺零点至罐底零点高差测量。对使用全站仪测量球型金属罐的测量不确定度进行了评定。使用全站仪测定,不确定度结果远小于国家计量检定规程JJG642-2007《球形金属罐容量》中U_(rel)=0.3%,K=2,说明该方法是可靠的。     

立式金属罐容量计量期间核查条件分析研究

本文通过对立式金属罐容量计量期间核查的条件进行分析探讨,有助于立式金属罐容量计量准确度的提高。     

商业信息

潍坊中云科研有限公司 中云科研有限公司是中云集团的全资子公司，致力于向用户提供全面的塑料管材生产技术和解决方案。其目前的主要业务范围为研发、制造系列高性能PE／PVC／PP双壁波纹管生产线，以用于生产直径50-2400mm的双壁波纹管。通过持续在塑料管材加工技术和生产设备方面进行研发和技术创新，该公司始终走在双壁波纹管生产技术的前沿。     

高模量聚丙烯双壁波纹管的制备及其应用优势研究

主要制备了与聚乙烯双壁波纹管相同结构的高模量聚丙烯双壁波纹管,分析了其质量、环刚度、冲击性能等。结果表明:与高密度聚乙烯双壁波纹管相比,高模量聚丙烯双壁波纹管的环刚度较高;在相同环刚度下单位长度质量轻,可以节省原料;在0℃时保持较高的冲击性能,在应用上具有较大的优势。     

浅谈成品油油库立式金属罐罐容检定新方法

成品油油库立式金属罐罐容检定主要参数是立式金属罐圈板直径的测量,圈板直径的测量方法有多种,有围尺法、光学垂准线法和全站仪法。全站仪法测量立式金属罐有两种方法,即内测法和外测法。本文主要论述这两种方法的原理与测量的基本过程,在同一立式金属罐,以两种测量法得到的半径与容量实验数据进行比对,从而来说明全站仪测量立式金属罐方法重复性较好,且实验数据精度达到规程的要求。     

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。