金明精机成功研制出PVDC加工机组

<正>据金明精机1月9日最新公告显示,金明精机成功研制出PVDC(聚偏二氯乙烯)多层共挤高阻隔薄膜专用吹塑机组,该机组生产的PVDC材料可用于生产高阻隔复合共挤膜产品。金明精机由此成为亚太地区第一家掌握PVDC预包裹加工技术的设备生产企业。据公告,PVDC材料是一种阻隔性高、韧性强以及低温热封、热收缩性和化学稳定性良好的理想包装材料,在包装行业独树一帜。该材料为陶氏化学专利产品,广泛应     

金明精机成功研制出陶氏特有的PVDC包裹加工机组

<正>据金明精机1月9日最新公告显示,金明精机成功研制出PVDC(聚偏二氯乙烯)多层共挤高阻隔薄膜专用吹塑机组,该机组生产的PVDC材料可用于生产高阻隔复合共挤膜产品。金明精机由此成为亚太地区第一家掌握PVDC预包裹加工技术的设备生产企业。据了解,2014年8月5日广东金明精机与美国陶氏化学公司于签署了《许可协议》,陶氏化学与金明     

一种PVDC复合防潮封套材料研究

根据我军武器装备储存和防潮封套技术发展现状,对封套材料提出了新的使用要求和性能设计指标,重点研究了如何提高材料阻隔性和综合防护性能。针对提出的性能要求,选择了综合性能优异的PVDC材料为封套的阻隔层,并首次采用共挤吹塑和干法复合加工工艺,将PVDC与TPU材料进行了复合,加工制得了具有阻隔性高、阻燃性好和质量轻等特点的PVDC复合封套材料。     

共挤复合薄膜

目前,塑料包装材料正朝着复合方向发展。作为复合薄膜家族中的共挤薄膜,由于具有一系列独特的优点,得到了迅速发展。共挤法可生产极薄(如2μm)的膜层,能经济合理地利用材料,而其它方法难以生产这么薄的膜层。单层薄膜加工最薄厚度为40μm,而作为共挤复合薄膜主体材料,厚度可减薄为10～20μm,共挤法是一步成型工艺,工艺简单,加工费用低;不需要溶剂性粘合剂,因此不会污     

中国兵器工业第五九研究所包装工程技术研究中心

正防静电材料通过导电填料表面改性处理、优化配方及工艺参数,使材料具有良好综合机械力学性能,同时赋予包装材料永久性抗静电的功能。主要技术指标及特点:表面电阻率≤1×108Ω断裂伸长率≥100%热封强度≥40N/15mm①黑色永久防静电膜②透明防静电膜③火工品防静电包装④电子仪器防静电包装高阻隔性软质包装复合材料通过对高阻隔性、防静电、电磁屏蔽,以及耐磨损等材料的多层复合,制备多功能性的软质包装复合材料。用于各种包装膜(袋),可为各种安全敏感的弹药、火工品提供良好的包装防护。     

PVDC肠衣膜高速机的质量控制要点

PVDC膜的应用 目前市场上存在的高阻隔材料有铝箔、PVDC、EVOH共挤膜、尼龙复合膜、真空镀SiOx膜等。其中PVDC是当今包装中综合阻隔性能最好的包装材料之一。我们知道在印刷中,PVDC肠衣膜是一种热收缩率很高的热敏性薄膜,当超过一定的温度,PVDC膜会迅速收缩变形。PVDC印刷过程中存在对温度设定,张力不稳和套印敏感等问题。影响着产品质量和生产效率。     

中国兵器工业第五九研究所包装工程技术研究中心

正防静电材料通过导电填料表面改性处理、优化配方及工艺参数,使材料具有良好综合机械力学性能,同时赋予包装材料永久性抗静电的功能。主要技术指标及特点:表面电阻率≤1×10~8Ω断裂伸长率≥100%热封强度≥40 N/15mm①黑色永久防静电膜②透明防静电膜③火工品防静电包装④电子仪器防静电包装高阻隔性软质包装复合材料通过对高阻隔性、防静电、电磁屏蔽,以及耐磨损等材料的多层复合,制备多功能性的软质包装复合材料。用于各种包装膜(袋).可为各种安全敏感的弹药、火工品提供良好的包装防护。     

五层共挤出复合薄膜的加工及应用

共挤出复合薄膜因为能充分利用各种材料的特点取长补短,所以往往能达到比较理想的包装效果。如五层共挤复合薄膜与常规包装材料 LDPE 膜和 PP 膜相比,无论是强度、阻隔性都有很大改善(表1)。下面,将苏州塑料四厂生产的 LDPE/Sur/PA/Sur/LDPE 共挤膜的工艺及设备特点作一介绍。     

新型无孔透湿TPU薄膜的制备及其服用性能研究

采用熔融共混和吹塑成型工艺制备了无孔型热塑性聚氨酯弹性体(TPU)薄膜。以膜厚度、温度和相对湿度为变量对TPU薄膜的透湿和透气性能进行测试分析,并对其表面形貌、成分含量、热稳定性进行了表征。实验结果表明:TPU薄膜的透湿量随着膜厚度的增加而减小,薄膜透湿量随着温湿度的升高而显著增加;按ASTME96BW—2000标准测试,厚度为0.012mm的TPU薄膜透湿量达7093g/(m~2·d)。利用扫描电子显微镜观察到TPU薄膜表面相对平整,未发现微孔结构。气体渗透率测试分析表明,CH_4和N_2基本无法透过TPU薄膜,因此TPU薄膜可以有效地阻隔细菌与病毒入侵。傅里叶变换红外光谱表征结果显示,1000～1300cm~(-1)处出现Si—O伸缩振动吸收峰,证明纳米SiO_2成功掺杂到TPU中。     

高阻隔聚乙烯醇涂布膜的研究进展

本文介绍了PVA材料高阻隔性能的机理,对常见的涂布型PVA阻隔膜的耐水改性研究、涂布复合工艺及其制作方法进行了综述,并对已经产业化的涂布型PVA阻隔包装薄膜作了简要阐述。文中将涂布型PVA阻隔膜和商品化的EVOH和PVDC阻隔复合膜进行比较,涂布型PVA阻隔薄膜阻隔性能优异、价格低廉、绿色环保,具有更加广阔的市场前景。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.