Unverified82% confidenceDecision RuleTime unknown

保温层采用铝箔+珍珠棉(EPE)复合结构、厚度≥5mm时，常温环境下有效保温(≥40℃)可维持3-4小时；仅单层铝箔的保温效果通常＜2小时，仅适合短途通勤

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Unverified隔热层采用铝箔+珍珠棉双层结构且厚度≥5mm时，热食可保温1.5-2小时；单纯铝箔膜（<2mm）仅能维持30-45分钟90% similar Unverified铝箔保温层需≥3mm加珍珠棉夹层才能维持1.5-2小时温度，单层铝膜（薄款）保温仅30分钟左右，冬季通勤选双层夹棉款89% similar Unverified铝箔层厚度≥4mm+双层EPE珍珠棉夹层的保温袋，常温环境下可维持饭菜温热3-4小时；单层薄铝箔袋（无EPE）实际保温仅1-1.5小时，通勤路程＜20分钟才够用89% similar

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