ABSTRACT

The thread-by-thread tear mending technique for canvas paintings represents an important field of research for the preservation of canvas paintings. This joining technology has been published and has become well established as a minimal invasive alternative for the treatment of local damage in the canvas, in contrast to the application of patches or the lining of paintings. Since then the technique has been further investigated, especially with regard to adhesive evaluation. For the first time, this paper presents the examination of five different test set-ups for the adhesive evaluation in an overall context: 1. uniaxial tensile tests on free adhesive films, 2. on mended yarns, 3. on fabric strips, 4. biaxial tensile tests, and 5. multiaxial burst pressure tests. The bonding was carried out on flax threads and canvas samples. For this purpose, single thread bonds were prepared within the specimens with a selection of different synthetic polymer dispersions and sturgeon glue modifications. Different bonding techniques were investigated, such as overlapping or butt joint mending, with and without bridging threads. The aim of the investigation was to understand the individual influencing factors in the various test series. Furthermore, the focus was on the development of a suitable test system for the evaluation of adhesives for the thread-by-thread tear mending treatment in textile painting supports. It can be stated that only the testing of several bonded threads in a fabric composite should be pursued as a long-term sensible test arrangement. This is in contrast to the previously very common set-up of testing mended single threads. Promising adhesives and adhesive modifications have been found for butt joints and overlap joints. The additional strengthening effect of bridging threads on butt joints has been proven and quantified.

摘要

画布画的逐丝撕裂修补技术是画布画保存的一个重要研究领域。这种连接技术已经发表，并已成为一种微创替代方法，用于治疗画布局部损伤，与补丁或绘画衬里的应用形成对比。从那时起，该技术得到了进一步的研究，特别是在粘合剂评估方面。本文首次介绍了在总体背景下对五种不同的粘合剂评估测试设置的检查：1. 自由粘合剂膜的单轴拉伸试验，2. 经修补的纱线，3. 织物条，4.双轴拉伸试验，和 5. 多轴爆破压力试验。粘合是在亚麻线和帆布样品上进行的。以此目的，在样品中制备了单线粘合，其中选择了不同的合成聚合物分散体和鲟鱼胶改性剂。研究了不同的粘合技术，例如重叠或对接修补，有和没有桥接螺纹。调查的目的是了解各种测试系列中的个体影响因素。此外，重点是开发一种合适的测试系​​统，用于评估纺织品涂装支架中逐线撕裂修补处理的粘合剂。可以说，只有对织物复合材料中的几种粘合线进行测试才应作为长期合理的测试安排进行。这与之前非常常见的测试修补单线程设置形成对比。已经发现用于对接接头和搭接接头的有希望的粘合剂和粘合剂改性。桥接螺纹对对接接头的额外加强效果已得到证实和量化。