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三层复合遮光布依靠中间黑色遮光丝实现物理遮光，无化学涂层，可机洗且不影响遮光率，是目前兼顾遮光与拆洗的主流方案，克重多在250-350g/㎡

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Unverified遮光窗帘遮光率分级：涂层遮光布遮光率90-95%仍会透边光，全遮光需选三层复合织造+背涂黑丝布结构，遮光率可达99%以上，且需搭配遮光盒或轨道贴墙安装才能消除四周漏光86% similar Unverified遮光布克重≥300g/㎡才能兼顾遮光与垂坠感，180-250g的薄款遮光布在强光下边缘透光明显，且垂感差易飘80% similar Unverified真正的全遮光需遮光率≥99.9%并配合黑色遮光涂层，普通深色PVC膜仅能达到85-95%遮光，白天仍有明显透光，追求午睡/暗房效果必须选带黑色内层的三层结构膜78% similar

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