| Summary: | 碩士 === 國立臺南藝術大學 === 古物維護研究所 === 94 === Since pressure sensitive tapes come to the market, people often use them to mend the tears . Though this kind of tape may hold the tears for a while, it accelerates the deterioration of paper. Natural rubber type pressure sensitive tape may crosslink and loss the adhesion eventually, and cause the embrittlement and discoloration on paper. Acrylate type pressure sensitive tape will cause some media bleeding and paper discoloration. It was not recommended to use for mending tears in the field of conservation. The best solution to stabilize paper is removing the pressure sensitive tapes on paper.
Pressure sensitive tape is constructed by two major layers: adhesive layer, which gives the adhesion and tack, and carrier layer, which provides support to the adhesive. In addition to the layers, primer and release agents are other minor components in pressure sensitive tapes.
Pressure sensitive adhesives have special characteristics of viscoelasticity .It gives the adhesive the ability to function as elastic materials, such as a spring, to deform under the stress. At the same time, it can behave as the flowing liquid depending on the magnitude and duration of the applied stress as well. When the pressure sensitive tape needs to be removed, one can take advantage of its property, which is flowing like the liquid under high temperature, and remove the carrier of the pressure sensitive tape. However the heat affects paper to some degree. Therefore this research design a simulation experiment to find out what degree it affects and make sure the heat application is suitable for the treatment. According to the primary result of the test for folding endurance of paper (MIT tester) and CIE L*a*b* colorimetry after accelerated aging, both the airpencil and the tacking iron can work on heat application safely with the condition 80℃ for about 4 minutes. The heat affects the mechanical property of paper slightly. However the airpencil performs better because the treatment can be monitored during the whole process. Thus the airpencil is chose to remove pressure sensitive tapes on ‘The Map of Taiwan’.
‘The Map of Taiwan’ is one of the collections at the National Museum of Taiwan History. The conservation treatment includes surface cleaning, pressure sensitive tapes and stain removing, stain reducing, flattening, mending and compensation.
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