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Unverified85% confidenceDecision RuleTime unknown

叠放层数超过4层时优先选PP材质硬质盒（承重≥5kg），PET软质盒叠3层以上易变形塌陷

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Unverified承重需求判据：底层箱体标称静态承重≥50kg才能安全堆叠3层以上，堆放书籍/工具等重物时选PP聚丙烯厚壁款（壁厚≥2.5mm），普通PET薄款堆2层就会中间凹陷变形87% similar Unverified承重堆叠场景选PP聚丙烯材质且壁厚≥2mm的箱体，单箱静态承重需≥50kg才能安全堆叠3-4层；PET或再生塑料薄壁款堆叠2层以上易变形塌陷86% similar Unverified需堆叠3层以上时，选带四角加强筋和承重卡槽的PP箱，单箱承重标注应≥15kg；软体箱堆两层以上顶层会塌陷压皱内容物84% similar Unverified承重需看层板单格承重而非整体，放乐高/积木类重物的格层单格承重应≥5kg，塑料斜插盒普遍单盒承重3-5kg，超载会导致盒体变形卡顿81% similar Unverified承重堆叠场景优先选PP材质且壁厚≥2mm的箱体，单箱静态承重需标注≥30kg才能安全叠3层以上；布艺箱无硬支撑结构，叠2层以上必塌陷变形81% similar

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