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Fav十万个为什么
为什么宣纸能千年不腐？
宣纸能千年不腐主要是因为其原料特殊、制作工艺独特、以及内部结构和保存环境共同作用的结果。
1、原料特殊。宣纸主要采用青檀树皮和沙田稻草为主要原料，这些原料本身含有较低的杂质，纤维素含量高，特别是青檀树皮中的韧皮纤维长而结实，为宣纸提供了良好的耐久性。
2、制作工艺独特。宣纸制作过程中，需要经过浸泡、蒸煮、漂白、打浆、捞纸、压榨、烘干等上百道工序，这些传统工艺有效地去除了原料中的木质素等杂质，提高了纸的纯度和稳定性，减少了纸张降解的因素。
3、内部结构和保存环境。宣纸内部结构紧密，纤维交织均匀，具有一定的抗虫蛀、防潮性能。同时，宣纸通常被保存在较为干燥、通风的环境中，避免了霉菌和虫害的侵蚀，从而能够长期保存。
总结：宣纸能千年不腐，是因为其原料特殊、制作工艺独特以及内部结构和保存环境共同作用的结果。
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