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Lub ntsiab yog vim li cas rau cov roj chaw: high degree ntawm cov roj nyob rau hauv aluminium foil dov, los yog tsis tsim nyog distillation ntau yam ntawm dov roj; mechanical oil infiltration hauv aluminium foil dov roj; txheej txheem annealing tsis tsim nyog; excessive oil on the surface of the product during rolling; The slitting tension is too large, causing the aluminum foil roll to be too tight.
