An inner-and-outer layered composite structure permanently bonds the dual-layer PE inner drum to the metal outer drum. The dual-layer PE inner liner ensures ultra-high cleanliness with strict particle and metal leaching control, so photoresists and high-purity electronic solvents are not contaminated. The 304 stainless steel outer drum provides robust, impact-resistant protection for plant transfer and stacking. Paired with a dual-layer PP sealing cover that blocks moisture, light and external contaminants, it effectively slows degradation of photosensitive media.