一种新型的多层复合软包装材料

综述了高阻隔性层合食品软包装的现状及发展趋势。介绍了以ＰＣ为结构层的新型多层复合材料ＰＣ／ＥＶＯＨ／ＰＰ，并评价了它在高阻隔性、高温、高湿、共挤加工等方面的综合性能及用于层含软包装的可行性。     

Optimization of anisotropic composite panels with T-shaped stiffeners including transverse shear effects and out-of-plane loading

A two-step method to optimize anisotropic composite panels with T-shaped stiffeners, including a new formulation of the transverse shear properties and an approximation of the ply contiguity (blocking) constraints as functions of the lamination parameters is provided. At the first step, a representative element of the stiffened panel (superstiffener) is optimized using mathematical programming and lamination parameters subjected to combined loading (in-plane and out-of-plane) under strength (laminate or ply failure), buckling and practical design constraints. Ply blocking constraints are imposed at this step to improve convergence towards practical laminates. At the second step, the actual superstiffener’s laminates are obtained by using a genetic algorithm. Results, for the case considered, show that the inclusion of transverse shear effects has an associated 2.5% mass penalty and that neglecting its effects might invoke earlier buckling failure. In addition, the influence of designing for failure strength at laminate or ply level is assessed.     

分层分类教学法在“计算机应用基础”课程中的应用

本文分析了目前计算机应用基础教学中存在的若干问题,并结合地方性高校的实际情况,针对各个问题分别提出了可行的对策,最后说明了实施的情况和取得的教学效果。     

塑料瓶贴标用乳液胶的研究

本文分析了塑料瓶的表面结构特性及其对贴标胶的要求，简介乳液胶的合成过程，讨论了聚会温度、搅拌速度、增粘剂和改性剂对贴标胶的影响。     

Processing and properties of tape-cast alumina/zirconia laminates composites

In the present work, laminar ceramic structures formed by layers of alumina and partially stabilized zirconia were fabricated by water-based tape casting. Rheological, physical and mechanical properties of slurries and laminates were evaluated. The laminates consisted of stacked alumina and zirconia green tapes produced by thermopressing. Pyrolysis was carried out at 450 °C and sintering at 1500 °C. The alumina/zirconia laminates were studied for a better understanding of the formation behavior and crack propagation at the laminate interface. The flexural strength values of laminates depend on the stress state on their surface. The laminates with the highest amount of zirconia layers presented low strength values (6.7 MPa), while the laminates with more alumina layers had a higher strength level (57.7 MPa). This is because these laminates have alumina layers on the surface which are in a state of residual compressive stress.     

水性真空镀铝PP膜──白卡纸复合胶粘剂

介绍了一种水性真空镀铝ＰＰ膜与白卡纸的复合胶粘剂的研制。该胶系丙烯酸酯－醋酸乙烯共聚乳液，用于高级卷烟包装材料的制造。     

五级叠片铁心变压器的空载性能

分析了五级接缝铁心降低空载损耗、空载电流及噪声的机理,指出铁心采用五级接缝铁心结构能够大幅度提高变压器的空载性能。     

Experimental study on impact absorbing performance of motorcycle helmets

The regulation regarding motorcycle helmets to protect the head from impacts has been amended recently. In Europe, the Head Injury Criteria (HIC), which is more relevant to indicate the probability of death than the limitation of maximum acceleration, has been adopted. An experimental study has been conducted following the procedure of the new European regulation, by changing various helmet structural parameters such as the lamination and the bulk density of the shell, and the liner, to investigate the ability of the helmet to protect the head from injuries. The maximum acceleration and HIC were measured. Experimental data have been analyzed with respect to varying lamination of shells and weight of liners. The HIC was found to be improved by reducing the bulk density of the liner and the number of laminations of a shell, and by increasing the loading area of the headform.     

High-performance polymer photovoltaic devices with inverted structure prepared by thermal lamination

Use of a lamination process for the introduction of Au electrode, instead of conventional metal evaporation, improved the power conversion efficiency (PCE) of inverted-structure photovoltaic devices from 1.6% to 2.6% based on a bulk heterojunction of poly(3-hexylthiophene) (P3HT) and (6,6)-phenyl C₆₁ butyric acid methyl ester (PCBM). X-ray photoelectron spectroscopy indicated that a thin layer of P3HT is spontaneously formed at the air/polymer blend layer interface during the spin-coating process. It is suggested that the vacuum-evaporated gold could destroy the surface-segregated thin layer of P3HT, while the lamination process preserves the surface structure working as an electron-blocking layer. The insertion of a PEDOT:PSS layer, between the metal electrode and polymer layer, in the lamination process further improved the PCE to 3.3% with a short-circuit current density of 9.94 mA cm⁻², an open-circuit voltage of 0.60 V, and a fill factor of 55% under AM1.5 100 mW cm⁻² irradiation.     

层压板厚控制分析报告

从影响层压板厚的基材厚度、PP100%残铜时压合厚度、各内层残铜率、内外层铜箔厚度等各方面经过大量实验准确得出板厚的控制方法,并设计“多层板压合后板厚计算表”,简单输入所需信息后可方便快捷的计算出层间半固化片厚度和压合后最终板厚。方法合理科学,可完全指导实际生产。