珂罗版复制技术(三)

修版工作完成之后，下一步就要进行晒版了。值得提醒大家注意的是，晒版所用的感光胶是自己动手制作出来的，而不是从外面买现成的。接下来我们就先谈一谈感光胶的制造。     

陶瓷花纸的网版印刷(三)

采用网版印刷工艺生产陶瓷贴花纸，其工艺重点在于确保套色准确、色层厚实且有光泽、图案的色调层次清晰这三个方面。     

珂罗版的发展概况（三）

还记得1998年,中国红十字会主动找到我们,要复制赵朴初为他们的题字《奉献》。当年抗洪救灾中涌现出许多先进个人和集体,中国红十字会为了表彰这些个人和集体,就把我们用珂罗版复制的这个条幅赠予他们。有趣的是后来我们在外地出差时,在某学校见到了这件复制品,当时我们很惊讶,一问才知就是当年他们学校获得的奖励。我们用珂罗版复制了许多重要的、宝贵的文物资料及名家真迹,给我们的生活添上了浓重的一笔．     

精细网目调的网版印刷(三)

米歇尔·卡萨于1935年生于法国,毕业于法国新闻大学和瑞典社会大学。1954年在斯德哥尔摩进入网版印刷领域。1979年和1984年,他相继建立两个网印厂,从事艺术品和POP印刷,卡萨先生共印了约3 000多件精细艺术品。现在专门从事特别复杂的网版印刷,自1983年以来,其印品共获近300项奖励。卡萨先生还是个作家,写了一些书和上千篇技术文章,出版了几种语言的技术光盘,在全世界作过多次技术讲座。在1996-2002年间,他连任FESPA会长,现为FESPA理事。应中国网印及制像协会的邀请,卡萨先生曾于2001年5月26日在北京为首届亚太网印展作了为时一天的“精细网目调的网版印刷”专题讲座,以其丰富的经验、娴熟的技术和对网版印刷深邃的理解,作了一个精彩的、高质量的讲演,给中国网印人留下了深刻的印象。本刊编辑部将讲座译稿加以审校和整理,拟在本刊2003年第3期开始连续刊出,以馈读者。由于我们的水平有限,译文中难免有不当之处,欢迎读者提出意见,共同学习探讨。     

牛奶蛋白纤维的染色与后整理（第Ⅲ部分）

牛奶蛋白纤维均匀度好、杂质少,蓬松、易包装,且可纺性优异,但也存在着纤维间摩擦系数小、抱合力弱、质量比电阻大等问题,所以为了获得优质的纱线,必须进行预处理,同时必须选择合适的运行湿度,并添加抗静电剂。牛奶蛋白纤维应用广泛,可用于针织、机织产品,具有很强的市场竞争力。     

特种印花综述(三)

隐影特种印花 纺织品隐影印花就是纺织品上的花型图案随着周围环境温度、光线明晴、织物干湿的变化等等，而引起花型图案忽忽现的变化，变幻无穷的印花。纺织品隐影印花技术就是将现代高新技术材料印制在纺织品上，当人们在穿着或使用的时候，感受到变幻莫测的乐趣，达到奇特的动态效果，故亦称动态印花。隐影印花有下列几种隐影变化形式。     

传统防染印花的沿革(三)

扎缬(绞缬、扎染)早在3 000年前，我们的祖先就采用蓝草浸渍来染色，至春秋战国时期发明了靛蓝发酵法，到秦汉时染蓝的工艺技术已相当成熟，同时采用镂空版印花叫做夹缬的技术已较为普及。到东晋时发明了扎缬染，其形式有“鱼子缬”和“玛瑙缬”。到唐代扎缬产品已成为统治阶层的时髦品为“青碧缬”。元明时期染缬继续发展，在元代通俗读物《碎金》一书中记载有檀缬、蜀缬、锦缬(指方胜格子式样)等数种缬类产品。在整个历史发展中，唐代随着五色夹缬的盛行，扎缬也以其独特的手法创造了退晕缬、撮晕缬，改变了过去以圆心放射的圆形发展到四…     

网印高端技术产品精彩无限(三)

五、厚膜电路技术 在PCB行业的应用PCB的成本通常包含20%～40％的元件成本,厚膜电路浆料的应用使得成本大大减少,尤其是浆料替代了键盘和边缘连接件上的黄金材料时,这个节省通常来自作为材料使用的成本较低的石墨。与黄金材料比较,网版印刷多层厚膜电     

电子书的现状和未来发展㈢——电子书的未来

<正>当电子书普及之时,将会形成怎样的业界构造和市场构造呢?有人预测,电子书的普及将在2013年以后。电子书阅读器应转向设备开放Google公司并不销售电子书阅读器,其开设的电子书店是第一个真正全面基于云计算的电子书解决方案     

Carrageenan analysis. Part 3: Quantification in swine plasma

Development and validation of this method was conducted to support a 28-day piglet feeding study of swine-adapted infant formulations stabilised with carrageenan. The validation was performed in accordance with USFDA Good Laboratory Practice (GLP) Regulations and associated current bioanalytical guidelines. Separation of carrageenan from plasma protein was unsuccessful using saturated sodium chloride due to the extremely strong cross-linking interactions between carrageenan and protein. Poligeenan is the deliberately acid-hydrolysed low molecular weight polygalactan non-food product produced from carrageenan. Poligeenan molecules are nearly identical to carrageenan molecules with respect to molecular structure, the primary difference being molecular weight. These poligeenan molecules have similar molecular weight when compared with the lowest molecular weight fraction of carrageenan called the low molecular-weight tail (LMT). Poligeenan was separated from plasma protein using the salting procedure, this being due to the significantly weaker interaction with protein caused by its shorter molecular chain length. Thus, poligeenan was applied as a chemical analyte surrogate for the LMT of carrageenan solely for the development and validation of the method. This method was used to try to detect the LMT of the carrageenan test material during the 28-day piglet feeding study, and if such was absorbed into the bloodstream. Successful development and validation of the method was achieved using LC-MS/MS coupled with ESI in negative-ion mode. A standard curve of instrument response versus poligeenan concentration was developed using swine plasma spiked with a range of poligeenan concentrations. The lower level of quantification (LLOQ) of poligeenan was 10.0 µg ml^–1, and the quantification range was 10.0–100.0 µg ml^–1. No animals were fed poligeenan.     

Lipid Oxidation. Part 3. Oxidation of Egg Phosphatidylethanolamine

Phosphatidylamine isolated from egg yolk phospholipids was autoxidized at 60 °C. Oxidation products were separated by thin layer chromatography on silica gel and by column chromatography on DEAE-cellulose. The fractions were characterized by UV and IR spectra and by chemical analysis. Polyunsaturated fatty acids were destroyed during the oxidation, the content of primary amino groups decreased and imine derivatives appeared.     

网印电子陶瓷技术探讨（三）

（3）网版印刷技术与金属上的LTCC工艺技术在LTCC的基础上开发的一种金属上的玻璃／陶瓷（LTGC-M）产品,它是将所需要的层数层压在金属基板上,并共烧成整个基板,图9所示为金属上的低温共烧陶瓷基板。制备该基板的工艺流程如图10所示（图中所涉及“印刷”均为网版印刷工艺）,这种制造方法的优点如表16所示。最值得注意的特征是零收缩率,     

糖厂设备维修经验(三)

[上接本刊 2 0 0 3年第 5期 ]7　压榨机联轴器从改进造型—热处理—提高质量的工作经验　　六十年代初期以前 ,贵糖、南糖等厂开榨时 ,压榨机联轴器往往会在短期内出现连续爆破现象 ,严重时三天两头便换一只。每当出现这种情况 ,厂领导便焦急地布置机修车间赶铸备品。我们作为设备维修者常为赶制这些又笨又重 (每件 1 .5 t)的备品而感到压力沉重。由此转入注意研究和改进阶段——通过观察已爆口急轮 (联轴器俗称 )的断面 ,从铸铁的配比、投料、造型、热处理方面 ,步步作出改进。　　当时已爆口急轮断面的外表面 ,常常呈现出有白口或麻口现象…     

Dry beans of Phaseolus: a review. Part 3

Beans of Phaseolus are important food crops both economically and nutritionally, and are cultivated and consumed world wide. With ever rising costs of meats, fresh fruits, and vegetables, dry beans are expected to contribute more to the human nutrition in coming years. Traditionally, they have been referred to as "poor man's meat" and have contributed significantly to the diets of many people of several countries in Asia, Africa, the Middle East, and South America. In recent years, a renewed interest in bean research in Western European countries and the U.S. is evident. In this review, certain biochemical, technological, nutritional, and toxicological aspects are discussed and the limitations and problems associated with dry beans of Phaseolus as human food are addressed.     

胶刮的制造、应用及检测（三）

1．胶刮在厚膜电路中的应用 所谓厚膜电路是指导电浆料用网印方法制成电路单元的过程,一般情况导电浆料采用银浆、铜浆、碳浆,用网印方法印在绝缘板上的有一种称为碳膜板,已经蚀刻好电路图形,为节约成本在导电线路上印上绝缘浆料,然后用导电浆料进行电路连接,形成单面的双层板,如我们平时所用的遥控器、电话机板、计算机器等。     

Study on taste substances of tomato Part 3. Sensory evaluations

The authors wished to clarify the role played by amino acids and minerals in the formation of the taste of tomatoes by means of sensory evaluation of model solutions. In preparing the model solutions the results of the thorough analysis of two tomato cultivars (K-549 and Mokka) were taken into account. It was established that the effect of free amino acids on the pH and the buffer capacity of the system cannot be neglected, in addition in the presence of minerals they affect taste advantageously, contributing to the development of tomato character. The effect of pyrrolidone-carboxylic acid (PCA) on the taste was also investigated. The sensory threshold value of PCA in aqueous solution was found to be 500 ppm. The quality of taste was found sour, tart and occasionally bitter. On adding PCA to tomato puree the appearance of off-flavour was not observed, indeed it was found that in certain concentrations it affected the taste of lower quality purees advantageously.     

高精密电子网版印刷技术创新特色与市场商机(三)

6.DEK电铸网版与可变网孔高度技术（VAHT） 世界领先的高精度批量挤压印刷解决方案供应商DEK再次在网版技术领域取得突破,通过其制造过程,结合专有的精密网孔高度控制方法,将电铸网版技术提升至新的水平.     

Pro/Engineer标准件库的改造

介绍了通过向Pro／Engineer标准件库中添加参数来将它改造成符合我国国家标准的标准件库的技术和方法。     

Edible films made from gelatin, soluble starch and polyols, Part 3

The thermal and mechanical properties of edible films based on blends of gelatin with soluble starch plasticized with water, glycerol or sugars were investigated. Two different methods, known as ‘the high temperature’ and ‘the low temperature’ methods, consisting of casting aqueous solutions of blends at 60 and 20 °C, respectively, were employed for the preparation of films. With increasing water, glycerol or sorbitol content, a drop of elasticity modulus and tensile strength (up to 50% of the original values for 30% plasticizer) was observed. The tensile strength and percentage elongation increased with high gelatin contents (> 20% w/w). The development of a higher percentage renaturation of gelatin (reaching 70% for 5% water content) by the ‘low temperature’ method caused a reduction in gas and water permeabilities. The former decreased by one or two orders of magnitude for O₂ and CO₂, respectively. The semi-empirical model for calculation of gas permeability and the semi empirical equations for upper and lower limits of tensile moduli of composites were applied with limited success and the obtained values were compared to those experimentally determined.     

网印机上易出现的故障与排除(三)

我们在第二部分讨论了印刷机的调整，如印刷平台的平整度、真空孔的封闭和静电处理等及其对质量和操作性能的重要性及影响。前两部分集中讨论了印刷机准备的基本内容，现在，我们在第三部分将继续讨论刮墨板的作用，如刮墨角度和刮印压力及其影响、网距和剥离距离的确定等。