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首页> 外文OA文献 >Angled curtain coating: An experimental study. An experimental investigation into the effect of die angle on air entrainment velocity in curtain coating under a range of operating conditions.
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Angled curtain coating: An experimental study. An experimental investigation into the effect of die angle on air entrainment velocity in curtain coating under a range of operating conditions.

机译：有角度的幕布：一项实验研究。在一系列操作条件下，模具角对幕涂中空气夹带速度影响的实验研究。

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摘要

In all coating applications, a liquid film displaces air in contact with a dry solid substrate. At a low substrate speed a thin uniform wetting line is formed on the substrates surface, but at a high speed the wetting line becomes segmented and unsteady as air becomes entrained between the substrate and the liquid. These air bubbles affect the quality of the coated product and any means to postpone this at higher speeds without changing the specifications of the coating liquid is desirable. This research assesses the validity of a theoretically based concept developed by Blake and Rushack [1] and exploited by Cohu and Benkreira [2] for dip coating. The concept suggests that angling the wetting line by an angle ß would increase the speed at which air is entrained by a factor 1/cos ß. In practice, if achieved this is a significant increase that would result in more economical operation. This concept was tested in a fast coating operation that of curtain coating which is already enhanced by what is known as hydrodynamic assistance [2]. Here we are effectively checking an additional assistance to wetting. The work, performed on a purposed built curtain coater and a rotating die, with a range of fluids showed the concept to hold but provided the data are processed in a way that separate the effect of curtain impingement from the slanting of the wetting line.
机译：在所有涂料应用中，液膜都会置换空气，使其与干燥的固体基材接触。在低基材速度下，在基材表面上会形成一条细而均匀的润湿线，但在高速下，由于空气夹带在基材和液体之间，因此润湿线变得分段且不稳定。这些气泡影响涂覆产品的质量，并且需要任何在不改变涂覆液规格的情况下以较高的速度推迟该质量的方法。这项研究评估了由Blake和Rushack [1]提出并由Cohu和Benkreira [2]用于浸涂的基于理论的概念的有效性。这个概念表明，将润湿线倾斜一个角度ß可以使夹带空气的速度提高1 / cosß。在实践中，如果实现的话，这将是一个重大的增长，这将导致更经济的运行。这个概念已经在幕涂的快速涂布操作中进行了测试，而幕涂已经通过所谓的流体动力辅助技术得到了增强[2]。在这里，我们正在有效地检查润湿方面的其他帮助。这项工作是在专用的幕帘涂布机和旋转模具上进行的，使用了一系列的流体，可以保持这一概念，但是只要对数据进行处理，就可以将幕帘撞击的影响与润湿线的倾斜分开。

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    Elgadafi Mansour Masoud;

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  • 年度 2010
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