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In recent years, the number of transformers using Thermally Upgraded Kraft paper (TUK) for winding paper has been increasing prevalently. However, although TUK has been in practical use for some time, its heat-resistant mechanism has not been fully elucidated, and it is currently being utilized without a clear understanding of its mechanism of action. This study investigated the reactivity between TUK additives and components within insulating paper, examining the composition of the products and its effect on tensile strength. As a result, levoglucosan (as a decomposition product of cellulose) reacted and polymerized with dicyandiamide, forming a polyamide with sugar chains. This confirmed that this component possesses properties enhancing paper strength.
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Sato et al. (2026) studied this question.
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