The shear properties of woven carbon fabric

This paper presents experimental and theoretical studies of the shearing properties of carbon plain weave fabrics and prepregs. The shearing characteristics of these materials are determined by the use of a picture frame shear rig which is loaded by a mechanical test machine. The shear force/angle curves are presented for the experiments conducted with the various test materials. A proposed shear model based on previous research which idealizes the fabric yarns as beam elements is presented. Using fabric geometric and material parameters, the model predicts the initial slip region of the fabric, as well as the more dominant elastic deformation range. Comparisons of the experimental and theoretical results were conducted to validate the model. A discussion of the findings from the analysis is also given, with particular focus relating to the accuracy, limitations and advantages offered by such a model. Results indicated that the slip model gives modestly accurate predictions, whilst the elastic modulus model showed very good correlation with experimental data.     

论现代家纺设计中流行色的运用

流行色作为一种引导潮流的色彩语言,广泛运用于现代家纺设计之中.在论述现代家纺设计中运用流行色的必要性基础上,对实际运用时消费者个人、民族性爱好和品牌定位等影响因素进行分析,提出家纺设计只有在明确市场色彩定位的前提下,与常用色、纹样和面料完美结合,才能展现出最佳的色彩效果,更好地迎合消费者审美趣味的观点.     

织造过程中经丝断头原因的探索

本文就织机上引起断头的原因进行了探讨。并在实际织造过程中进行了断头情况的观察.结果表明,发生断头最频繁的区域是前梭口区和综框区,其中综框区最多。若采取相应的措施则有益于经丝断头的减少。     

分步加料法合成聚酯多元醇

以二元醇分步加料法合成了聚酯二醇。研究结果表明，该法与一步法相比具有某些优点，例如：实际分子量与理论计算值相近，合成过程中副产物及二元醇损失为较少。研究还表明，保持最后一次加二元醇时反应体系ｎＯＨ／ｎＣＯＯＨ＝２是必要的。     

Powder coatings technology: new developments at the turn of the century

The growth of the powder coating business is affected by the toxicological effects of the raw materials used in the coating formulation and the saturation of the present market for powder coatings, being limited to general metal applications only. This has a strong influence on the long-term research programmes at both raw materials suppliers and powder paint producers. In the last decade of the 20th century, we witness appearance of several new types of toxicologically-safe powder coating systems on the commercial scale. At the same time, there is strong evidence of efforts to penetrate new market fields where powder coatings are not typically used. This includes the markets for automotive clear top coatings, can and coil coatings, coatings for industrial wood, plastics and paper. The new developments in the chemistry of powder coatings are followed by changes and improvements in the production technology for powder coatings as well as developments of new application techniques. This paper summarises the research work on chemistry, production and application technology of powder coatings and tries to extrapolate the tendencies in the years to come in order to predict the achievements and the impacts on the paint industry.     

纯棉针织天鹅绒质量控制

针对纯棉针织天鹅绒常见的如纬斜、绒面质量、绒面手感、起毛起球等质量问题进行分析,结合生产经验,提出工艺方面的控制及改进.     

Effect of curing conditions on the morphology of wax modified coil coatings

Raman spectroscopy and optical light microscopy were applied to analyze the morphology within the bulk and on the surface of wax modified topcoats. To vary the processing conditions resin formulations were coated on primed steel sheets and cured at peak metal temperatures of 230, 240 and 250 °C. By Raman spectroscopy dispersed, spherical wax domains within the bulk and on the surface were detected. These features revealed residues of the polyester based resin and the TiO₂ pigment. While the size of the identified lubricant features showed only a slight shift to smaller diameters with increasing peak metal temperature, a significant effect of the curing conditions on the overall number of wax domains and the relative area covered by wax was ascertained. A direct linear correlation between peak metal temperature and relative area covered by wax within the bulk and on the surface of the topcoats was established.     

Studies on the chemical, physical and mechanical properties of high-solids clearcoats prepared from hydroxyl-terminated isophthalate-based oligoesters and a melamine resin

A series of high-solids (solvent-free) clearcoats was prepared from hydroxyl-terminated isophthalate-based oligoesters and the hexakis(methoxymethylol)melamine resin (HMMM). The oligoesters, which were used as binders, were prepared via a transesterification reaction of dimethyl isophthalate (DI) under various molar ratios R (=mol ratio diols/diester) with a mixture of 1,6-hexanediol (HD) and 2-methyl-1,3-propanediol (MP). Mixtures of the two diols of different composition R_d (=mol ratio HD/MP), were used as well. An attempt was made to investigate and correlate the chemical, physical and mechanical properties of the formulated solvent-free clearcoats to: (a) the amount of the cross-linker (melamine resin); (b) the curing conditions (time and temperature); (c) the synthetic parameters applied in the preparation (via transesterification) of the oligoesters (e.g. excess of the diols in reaction with the DI and the molar ratio between the two diols, the species of the Lewis acid catalyst). The properties of all the new formulated high-solids clearcoats were compared to those of a reference clearcoat and their cross-linking was correlated to their chemical structure and composition as well as to their T_g values. It was found that the R and R_d values applied in the synthesis of the oligoesters (binders) significantly affected the performance of their corresponding clearcoats. More specifically, the clearcoats obtained from binders where 3<R<4, combined an enhanced processability, higher values of non-volatiles (80%) (lower VOC content) and better or comparable chemical, physical and mechanical properties (e.g. impact resistance, gasoline resistance, mar resistance, flexibility and pencil hardness) upon comparison to those of the reference clearcoat.     

21世纪世界科技的发展与染整技术发展的展望（上）

概要回顾和瞻望了世界科技的发展，对２１世纪染整技术的前景作了展望。     

聚酯改性长丝-幻彩织物之开发

本文从原料的选配、组织结构、经纬密度、织选集整等工艺设计阐述了聚酯改往长丝-幻彩织物的研制过程．并对生产中的主要技术关键作了分析。