浅析覆膜涂胶均匀状况与涂胶量

覆膜工艺看似简单,但蕴含着很多复杂的物理、化学作用,生产时需要掌握其科学规律,否则就会出现质量问题.其中涂胶的状况和涂胶量就对覆膜质量的影响很大.涂胶是通过覆膜机械涂胶机构施压辊的压力,迫使薄膜硬性地将涂胶辊表面附着的胶粘剂"蹭走",使胶液向薄膜进行转移涂布,其转移效果,即涂胶均匀状况和涂胶量的大小,会直接影响复合质量.因此,控制涂胶均匀状况和涂胶量,是即涂胶湿式复合工艺和热熔胶预涂膜生产的技术核心.     

浅新覆膜涂胶均匀状况与涂胶量

覆膜工艺看似简单，却蕴含着彳艮多复杂的物理、化学因素，生产时需要掌握其中的科学规律，否则就会出现很多质量问题。其中涂胶的状况和涂胶量就对覆膜质量有很大影响。覆膜工艺中，涂胶是通过覆膜机械涂胶机构施压辊的压力，迫使薄膜硬性地将涂胶辊表面附着的胶粘剂“蹭走”，使胶液向薄膜进行转移涂布，其转移效果，即涂胶均匀状况和涂胶量的大小，会直接影响复合质量。因此，控制涂胶均匀状况和涂胶量，是即涂胶湿式复合工艺和热熔胶预涂膜生产的技术核心。     

总装涂胶工艺的专项研究

汽车风挡玻璃的粘接工艺师汽车装配过程中的一个重要组成部分,汽车风挡玻璃粘接的质量对汽车的性能和质量有非常重大的影响。因此,汽车风挡玻璃的工艺设计在总装工艺设计中是很重要的一项工艺设计内容。本文从奇瑞公司汽车风挡玻璃涂胶的现有工艺布置型式、工艺流程等方面进行总结,并与拟在新工厂项目中采用的涂胶分装线进行比较,从而论证两种涂胶工艺布置型式的优缺点。     

一种高效双刮刀圆网涂胶装置

在圆网印花行业中，圆网涂感光胶工艺20多年来一直沿用荷兰STORK公司的浸润式涂胶技术。用胶量多，速度慢，效率低，许多厂不得不增加涂胶机来满足生产的需要。最近我们开发研制的双刮刀涂胶装置，涂胶机不做任何改动装上该装置可以使涂胶速度提高10倍，用胶量减少2／3。制网质量明显提高，经印染厂使用经济效益十分明显。     

介绍几种齿榫涂胶装置

齿榫涂胶是木材指接生产中主要工序,它直接影响木材指接产品的质量和生产率。目前,国内除进口设备之外,均采用手工涂胶,这种方法有劳动强度大,浪费胶粘剂、污染环境等缺点,而国外普遍采用机械涂胶。涂胶方法包括刷辊涂布、异形辊涂布、胶料和催化剂混合喷涂及胶料和催化剂分别喷涂,其优点是涂胶均匀、减少胶粘剂的损失,便于生产自动化。本文主要介绍几种机械齿榫涂胶装置,供国内研制安全可靠的涂胶装置参考。     

YB617型条盒包装机涂胶器的改进

针对YB617型条盒包装机存在条包内两端烟包与条盒内壁粘连次数过多,造成小盒烟包难以取出,不符合产品质量要求的问题,通过对涂胶器进行改进,采用断开式涂胶工作面代替整体式涂胶工作面。改进效果表明,改进后的涂胶器解决了条包内烟包粘连次数过多的问题,同时降低了材料损耗,保证了条盒涂胶质量。     

单板淋胶法涂胶

本文描述了一种大面积涂胶的设备——淋胶机的特点。它与辊涂机相比,能夠控制涂胶量、节省材料和減少劳动力,具有较大的发展前景。     

紧固件自动涂胶设备关键结构设计

针对紧固件手工方式涂胶存在的加工效率低、涂胶不均匀、胶液浪费等问题,本文对紧固件自动涂胶设备进行了开发设计。采用螺旋槽式输料结构,实现了零件的自动排序和上料;设计了由间隙可调式导轨、气动系统和分离圆盘组成的驱动机构;利用配合运动的方式,设计了紧固件的涂胶机构,包括涂胶片、摆动臂、旋转电机、顶推套筒及驱动气缸,实现了对排序零件的自动连续涂胶。结果表明该设备自动化程度较高,零件加工范围广,涂胶均匀,同时避免了手工涂胶对人体产生的伤害。     

浅析覆膜涂胶均匀状况与涂胶量

覆膜工艺看似简单,却蕴含着很多复杂的物理、化学因素,生产时需要掌握其中的科学规律,否则就会出现很多质量问题.其中涂胶的状况和涂胶量就对覆膜质量有很大影响.覆膜工艺中,涂胶是通过覆膜机械涂胶机构施压辊的压力,迫使薄膜硬性地将涂胶辊表面附着的胶粘剂"蹭走",使胶液向薄膜进行转移涂布,其转移效果,即涂胶均匀状况和涂胶量的大小,会直接影响复合质量.因此,控制涂胶均匀状况和涂胶量,是即涂胶湿式复合工艺和热熔胶预涂膜生产的技术核心.     

聚焦直接涂胶制版法

涂胶工艺直接关系到网版质量。本文由Kiwo公司技术支持部提供,将阐述如何通过优化直接法感光胶版膜的厚度和表面特性使其发挥最大功效的方法。 直接法感光胶具有机械耐久洼、抗溶剂性、抗水性、印刷质量高、价格适中等优点。不过,使这些特性一一发挥出来的前提是必须对曝光前的正确涂胶方法有很好的理解。下面阐述的指导方针将帮助你完善涂胶工艺,确保每一次都能获得可靠、高性能的版膜。     

一种新型的涂布技术--帘式涂布

介绍了帘式涂布技术的原理,帘式涂布机的结构、优越性、实践应用,指出该涂布技术的使用要求、注意事项及前景展望.     

Hydrocolloid coating of cheeses

Semi-hard and dry white brined cheeses were coated with hydrocolloid films based on κ-carrageenan, alginate and gellan. The cheeses were immersed in the gum solution followed by cross-linking of the gum solution to produce a coated product. A few coating films were then dried by airflow to induce better adherence of the coating to the coated object. The coated cheeses were stored at 4°C and at a relative humidity of 73%. Weight loss, gloss, roughness of surface area, changes in mechanical properties versus time (i.e. stress and strain at failure, stiffness and elastic properties), peel-bond strength of the coating film from the cheese and sensory evaluation were studied for each coated system. For the semi-hard cheese, all kinds of coatings reduced weight loss during 46 days of storage. With regard to weight loss, no significant differences between the various coatings were found. The coating contributed to a better color and gloss. The roughness of the coated cheese decreased after coating, since surface ruggedness was filled in by the film. Advantages in the textural properties of the coated cheese were observed. Since the coated cheese lost less water by evaporation, a desirable softer and a less brittle texture was detected. The elastic properties of the cheeses were estimated by calculating the recoverable work (the ratio between recoverable and total compressive deformation) of coated and non-coated cheeses. This parameter appeared to decrease from 48 to 34% after 24 days of storage; no advantage of the coated cheese was observed. The peel-bond strength of the film based on alginate was 1 g force/cm. In the case of the dry white brined cheese, no deliberate drying of the coated film was performed. All coatings reduced weight loss of the cheese with a significant advantage of the κ-carrageenan-based coating. The coatings contributed to a lower reduction in pH, thus a higher-quality cheese was obtained. In addition, the coated cheeses were softer and less brittle when compared to the non-coated cheese. The percentage of recoverable work of cheeses did not change even after 24 days of storage. The coatings increased the gloss of the cheese fivefold in comparison to the non-coated cheese. In a sensory evaluation, the coated cheese was found to be advantageous over the non-coated system. In general, cheese coating based on hydrocolloid films improved textural and sensorial properties when compared to non-coated cheeses. The coatings did not influence the taste of white brined cheese, and the technology involved is simple and relatively inexpensive.     

Modelling coating quality in fluidised bed coating: Spray sub-model

Fluidised beds are widely used in industrial applications for the coating of particles. Little research has been performed in developing a model that is able to predict the quality of the coating process in terms of the coating thickness and uniformity and the occurrence of unwanted side-effects, including agglomeration, attrition and spray loss. The quality of the coating process in a fluidised bed is largely determined by the spray characteristics and the particle motion. As a first step in the development of a new model for the coating process in a top-spray fluidised bed, an accurate spray sub-model that describes the movement and the heat and mass transfers of the droplets in the coating process was created and experimentally validated.     

水性涂层胶涂层整理常见问题分析及对策

阐述了水性涂层胶涂层整理中的常见问题,如渗胶(胶水渗到织物背面)、车路(布面出现明显的竖浆条纹)、鱼眼(布面出现不规则的胶点或露出基布)、条花横档(布面出现明显的横浆条纹)、针孔(又叫缩孔,比鱼眼小的露出基布)、起泡粗糙(会导致布面整体不平)、发粘(烘干后布面粘感比较重)、僵硬(涂层硬度明显大于基布后会产生僵硬的后果)、边中厚差、边中色差、色牢度差、涂膜剥离等.通过对基布、浆料及配套助剂的选择等工艺控制,可以有效提高涂层后织物的品质.     

涤塔夫伞面绸涂银工艺探讨

根据涂银伞面绸外观质量要求，筛选合适的涂层胶和银浆，给出涂银工艺处方，并对涂层中的注意事项进行说明。     

糖果挂糖衣技术

糖果挂糖衣是在成份不同的核果表面制成一层紧密糖壳的过程,是生产糖制品最古老的一项技术。早在古罗马时代,就曾有在果仁或坚果表面涂裹糖衣来制造糖果的文献记载。在阿拉伯和古埃及的早期文明中,这项技术也为人们所知晓。最早期的制造方法是使用圆形盘,盘的中心底部逐渐凹深,盘用链条吊在横梁上,下面是火或炉子,操作者摇动     

多功能涂层织物的制备

采用对环境污染小的水性聚氨酯作涂层剂,利用自制的羊毛角蛋白溶液对其进行改性以提高涂层织物的透湿性能,同时向涂层剂中加入抗紫外线纳米粉体。利用电子显微镜观察了涂层荆干法膜的表面形貌,采用红外光谱仪测试了其内部成分;对涂层后织物的各项主要性能进行了测试,其结果显示得到了集防水、透湿、抗紫外线功能于一身的多功能涂层织物。     

涂层织物组分定性分析法

采用单点衰减全反射红外光谱仪分析涂层织物，直接得到了聚醚系PU涂层剂、聚酯系PU涂层剂、PA涂层剂、丁苯橡胶涂层剂，以及涤纶、锦纶、腈纶等基布的红外光谱图；通过对PVC涂层和半PU涂层进行预处理，也可得到了与标准图谱匹配度较高的红外光谱。该法准确、快速、简便，可克服涂层织物制样难的缺点，能够系统地对常见涂层织物进行定性分析。     

非接触式落帘涂布技术

帘式涂布是一种非接触式涂布方法,对下落的涂料膜(落帘)在冲击到移动的纸幅之前有具体的要求,高的冲击速度需要相应较高的纸幅移动速度;对纸幅不产生机械压力,因此就大大减少了断纸率,并且能形成较好的涂层,从而可降低涂布量,提高生产能力.这种涂布系统非常简单,并且具有易操作、生产效率高等优点.但是在操作过程中也容易产生一些问题,比如:不规则踵部的形成,空气夹带的产生,落帘的不稳定性.这些问题可以通过调整落帘涂布参数使其达到最优来避免.本文对落帘涂布的原理进行了重点阐述,并讨论涂布缺点产生的机理、落帘涂布的优点及其在应用中的要求和注意事项.