浅谈电泳流痕综合治理

主要通过对涂装电泳流痕产生的原因分析研究,探讨了车身外板电泳流痕的综合解决方案。     

车身电泳流痕产生原因分析与防治

电泳流痕是汽车涂装电泳过程中常见的质量问题,为了更加有效地解决此问题,本文对电泳流痕产生原因、解决方法进行了研究与总结。通过对汽车白车身设计、冲压工艺、焊装工艺、涂装工艺等方面的分析,找出了各个阶段与各工艺对电泳流痕产生的影响。可以从车身缝隙设计、冲压切口与毛刺控制、焊装包边间隙、焊装折边胶涂胶直径与距离、涂装电泳固体分、电泳后冲洗、电泳后沥水、电泳烘炉烘烤工艺设定、电泳后人工吹水、车身导流工装等方面入手,综合分析,提前预防从而控制电泳流痕的产生。     

降低E车型电泳流痕单车缺陷数

对E车型在涂装过程中产生的电泳流痕问题进行了调查分析和验证,并采取了相应的控制措施,最终降低了E车型电泳流痕单车缺陷数。     

轿车电泳二次流痕缺陷分析与对策

对电泳涂膜电泳二次流痕缺陷的形成原因进行了描述和分析,探讨了导致电泳涂膜缺陷形成的机理。主要从涂装工艺、冲焊工艺以及车身产品结构等多方面对电泳二次流挂缺陷进行探讨和分析,并提供了一些预防及解决方法。     

车身电泳流痕问题的解决

通过一次电泳流痕问题,从材料、工艺、工装及产品结构方面综合研究车身电泳流痕的解决方案。     

汽车白车身窗框电泳流痕改善

阐明了车门窗框电泳流痕产生的原因,分别从钣金结构的设计、钣金加工精度的控制及工装导入辅助等方面进行对策验证,为车门窗框电泳流痕的消除提供了明确的思路。     

新车型电泳流痕的分析与解决

为解决新车型在试生产期间的电泳流痕问题,以车身设计开发、涂装工艺和装焊工艺为切入点,通过调整电泳工艺和电泳烘干室参数,优化装焊胶和零件匹配尺寸,减少甚至消除了特定部位的电泳流痕,进而保证车身质量,提高涂装车间的生产节拍。     

新车型电泳流痕问题分析及解决方案

电泳流痕问题是车身涂装过程中的一大难题,严重的电泳流痕不仅会影响外观而且还会制约车间正常生产,造成人力、物力浪费.电泳流痕的影响因素有很多,本文针对新车型电泳流痕问题,从焊装涂胶、车身匹配调整、设计更改、电泳工艺参数、吹净方式、烘干炉温度等方面进行系统研究,给出了一些解决方案.     

关于电泳二次流痕形成机理及控制的研究

阐述了汽车涂装过程中电泳流痕的产生机理,并对其影响因素进行了识别,通过对典型案例的分析,指出了在SE阶段、调试阶段针对流痕所采取的控制措施,并提出了在工艺规划阶段应该开展的内容.     

汽车涂装二次流痕问题浅析

列举了汽车涂装过程中二次流痕普发的几类现象,针对二次流痕的典型案例进行原因分析,并制定相应的整改方案,使二次流痕问题得到有效改善。文章所得的结果可为汽车涂装过程中的流痕问题提供解决方法和理论依据,同时为车型设计及制造过程提供经验,具有一定的工程应用价值。     

Fluid Flow Characteristics of Forced Flow Electrophoresis

Abstract

Fluid flow in forced flow electrophoresis has not been previously analyzed, even though it presents some interesting aspects. The effectiveness of this method for biological separations is due to a superimposition of an electric field on filtration. A mathematical model is presented, describing fluid flow and mass transfer for dilute solutions at electrical potentials less than the critical one. The calculated solute trajectories in a channel are determined by the ratio of the electrophoretic velocity to the withdrawal velocity through the permeable wall. The stationary layer and the layer in which all the solutes arrive at the permeable membrane at the end of the channel are also calculated. The concentration of the filtrate through the permeable membrane is obtained from the material balance of the solute entering the channel. Increased performance is obtained by means of a double-stage forced flow electrophoresis, where the ratio of final filtered solute concentration to inlet concentration is shown to be the square of the same ratio at the first stage.     

多通道流动电泳技术

多通道流动电泳是一项新型制备电泳技术。电泳过程在5腔室电泳槽中进行,各腔室之间用膜隔开,中间腔室为进样室,其两侧依次为冲洗室和电极室。当蛋白质混合物被连续引入进样室时,带电组分在电场作用下迁移过膜进入其对应的冲洗室,被载流冲出,中性组分则被进样流从进样室出口带出,从而实现分离。多通道流动电泳技术适宜于分离等电点有较大差异的混合物,可广泛应用于各类生物产品如蛋白质、酶、抗体及其它生物技术产品的大规模分离纯化过程。     

流动小室制品微注塑过程的流痕形成问题研究

利用Moldflow模拟了流动小室的微注塑填充和保压过程,分析了不同尺寸参数的腔体中的压力和剪切速率分布。根据实验制品流痕仅存在于微结构处的特点,发现局部剪切增大导致的壁面滑移是流痕产生的主要原因,提出可通过减小注射速度、增加制品总厚或改变浇口位置的方法消除流痕。研究结果表明,局部微结构的存在可能会对微注塑制品的产品质量产生显著的影响。     

浇口对注塑件流痕的影响

概述了注塑制品流痕的概念和成因。通过几次修改浇口类型和移动位置,证实了制品表面流痕缺陷是由于浇口类型和开设位置所致,调整时只要控制好这两个关键因素即可。     

浅谈阴极电泳涂料二次流痕解决思路

主要介绍了汽车涂装中阴极电泳涂膜二次流痕的产生机理及常用的解决思路、方案实施、效果验证过程。     

某电泳生产线废水处理优化设计

针对某企业电泳生产线污水处理站的扩建改造进行优化设计。实行废水分批、分类别处理,采用二级混凝沉淀处理装置,控制适宜的pH,实现了硫酸盐、锌离子的有效去除。增加了滤膜对生化后废水进行了二级净化,出水水质显著提高。改造后,有机污染物、重金属离子质量浓度显著降低,COD降幅为76.4%,锌的降幅为60.2%,满足环保排放标准要求。     

Multichannel Flow Electrophoresis in an Alternating Electric Field

Abstract

Investigation on the mass transfer behavior of multichannel flow electrophoresis (MFE) has confirmed the existence of concentration polarization in the separation process, which is characterized by a reduction of the relative protein migration flux corresponding to an increase in the protein concentration in the feed. The mobility of bovine serum albumin (BSA) in a gel membrane, as interpreted from its elution curve, was about one-sixth of its mobility in solution as determined by high capillary electrophoresis. This indicates that accumulation of charged protein onto the membrane surface occurs in MFE. An alternating electric field was applied instead of the steady one in MFE. The negative part of the alternating electric field reduced the polarization layer periodically. The effectiveness of this method was demonstrated by an over 40% increase of BSA migration flux at pH 6.9 in an optimized alternating electric field. The separation outputs of BSA and hemoglobin bovine blood conducted in an optimized alternating electric field at pH 6.0 were about 26 and 32% higher than their respective outputs obtained in a steady electric field. Because of its proven efficiency for reducing concentration polarization and its ease of operation, the use of an alternating electric field is a promising application in other membrane separation processes.