高阻隔液态牛奶包装膜

介绍新型的高阻隔材料——丙烯酸酯共聚物。将其配制成高阻隔涂布液,再用涂布设备将高阻隔涂布液涂布于三层共挤聚乙烯底膜上,干燥后在高阻隔层上复合一层聚乙烯薄膜,得到高阻隔高保香性的液态牛奶包装膜。该产品在阻隔效果、投资成本、包装成本和卫生环保等诸多方面,都要比市场上的其他阻隔材料优秀很多。     

Evaporative Heat Transfer of Annular Two-phase Flow of Air-water in a Small Vertical Tube

The evaporative heat transfer of the non-boiling annular two-phase flow of air-water in a small vertical tube with uniform wall heat flux was studied both theoretically and experimentally. A simplified two-phase flow boundary layer model was used to calculate the thickness of the water film attached to the wall, and from the liquid film thickness the evaporative heat transfer coefficients of the annular two-phase flow were obtained. Theoretical equations and semi-theoretical equations were proposed for predicting the evaporative heat transfer of the annular two-phase flow of air-water in a small vertical tube. The semi-theoretical prediction agrees well with the experimental data. The mechanism of the heat transfer enhancement is the evaporation of the thin liquid film attached on the wall.     

自组装润滑膜体系的研究进展

介绍了有机聚合物类自组装润滑技术、自组装润滑膜体系的类型、影响润滑膜自组装行为的因素和自组装润滑膜的主要表征方法,提出了该领域今后的发展方向及需要解决的重点课题。     

液滴在斜板层膜上聚结时间的计算

在对聚结过程和分离界面处液滴与层膜流体力学特性分析的基础上,建立了单个液滴在斜板层膜上聚结时间模型,模型计算值与BlassE等人报道的实验结果误差小于10％。     

标准椭圆封头选用的探讨

应用薄膜理论应力分析,指出用JB／T4729－94中的椭圆封头替代JB／T4737－95中的椭圆封头是不妥的,并对制造过程中由于拉伸减薄而使用较厚钢板来制造封头时应注意的问题进行了论述。     

Hydrothermal preparation of BaTiO3 thin films

In preparing BaTiO₃ thin films under hydrothermal conditions, the effects of concentrations of nutrient and mineralizer, and reaction time on crystallinity, grain size, surface roughness, and film thickness were investigated. Experiments were performed in the ranges of 0.1-1.5M BaCl₂ · 2H₂O or Ba(OH)₂ · 8H₂O and 0-1.5 M KOH with varying reaction time from 0.16 to 8 hours at 140 °C. Bimodal dispersion of crystalline grains on the surface of BaTiO₃ thin films was predicted through nucleation and crystal growth reaction. As the concentrations of nutrient and/or mineralizer increased, grain size of the thin film became smaller, but more uniform and compact. When 0.4 M Ba(OH)₂ · 8H₂O was used with 1.0 M KOH, a reaction time longer than 4 hours was required in order to fabricate BaTiO₃ thin films.     

胶片扫描仪和记录仪色彩特性及其文件格式的应用

Cineon或DPX是胶片扫描仪和记录仪常用的文件格式,它是底片密度的线性表达,并且与对数场景亮度成为线性关系,带线性场景亮度的线性编码图像格式需要较高的比特深度。扫描仪感应的不是底片密度,而是底片的透光率,透光率需转换成有意义的影像衡量单位。因为转换时有损失,所以扫描的比特深度要高于输出的比特深度,这样避免图像失真。扫描的底片图像应记录到中间片胶片上,这样避免出现多余的颗粒,胶片记录仪输出的数字中间底片必须与传统洗印制作的翻底有相同的密度范围。本文较详细的介绍了胶片扫描仪和胶片记录仪的M状态、印片密度、彩色正片密度和传感器之间的关系及其它们的彩色特性,对文件格式的正确使用、底片密度和10比特对数代码值之间的关系,进行了分析。     

XPG-800型悬挂式胶片冷却机的研制

介绍最新开发的XPG-800型悬挂式胶片冷却机的设计特点、工作原理、主要技术参数、结构特征，阐述了本机组主要技术改进。     

BOPET薄膜透明度影响因素及提高方法

重点分析了原材料、助剂和生产工艺条件对BOPET薄膜透明度的影响;介绍了提高透明度的措施。主要措施有选用合适的原料并充分干燥、加入适量和恰当品种的添加剂和采用合适的加工工艺条件等。     

凝胶挤出流延聚氟乙烯薄膜的研究

介绍了一种适合聚氟乙烯薄膜生产制造的新工艺——凝胶挤出流延法。该工艺克服了聚氟乙烯自身结构特性给成型带来的困难,得到的薄膜产品具有耐候性强、强度高、透光率大等优点,并有很好的应用前景。此外还系统讨论了树脂结构、潜溶剂及加工条件对薄膜制品的影响。