Round-bottom pouch / Aluminum-plastic composite round-bottom pouch

Round-bottom bags (also known as round-bottom liners for metal drums) can be used as inner liners to isolate the contents from the drum, preventing contamination and extending the drum’s reuse cycle, thereby significantly reducing production and transportation costs. The bag’s shape matches that of the drum, and its excellent seal ensures long-term isolation of the contents from air and moisture, enhancing product preservation. This specialized round-bottom liner for drums comprises a body and a bottom, designed to conform precisely to the drum’s shape and fit snugly inside, effectively creating a barrier between the contents and the container. During use, first place the round-bottom bag into the drum, then proceed with normal filling.

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FIBC inner liner

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　　Round-bottom bags (also known as round-bottom liners for metal drums) can be used as inner liners to isolate the contents from the drum and prevent contamination. They also enhance the drum’s reusability, significantly reducing production and transportation costs. With a shape that matches the drum and excellent sealing performance, these bags keep the contents isolated from air and moisture over long periods, thereby improving storage quality.

　　A specialized inner liner with a round bottom, comprising a bag body and a base, is designed to match the shape of the container and fit snugly inside, effectively preventing direct contact between the contents and the container.

　　During use, first place the round-bottom bag inside the drum, then proceed with normal filling. After filling, seal the bag either by tying the opening with a rope or using hot air, and finally secure the drum lid.

　　Compared with the prior art, this utility model has the following advantages:

　　The round‑bottom bag of this utility model is made from a specially processed aluminum‑plastic composite material, with a seven‑layer structure composed of PET/AD/AL/AD/PA/AD/PE. The AD layer may be a polyurethane‑based two‑component adhesive or a PE/EVA‑based hot‑melt extrusion coating. The total material thickness ranges from 100 μm to 300 μm, and specific specifications can be customized according to customer requirements. This structural design delivers exceptionally high mechanical strength and excellent puncture resistance, while maintaining a soft texture and outstanding foldability. Moreover, the material exhibits extremely low water vapor and oxygen transmission rates—performance far surpassing that of conventional PE plastic bags. It effectively addresses the issue of direct contact between the contents and the container during drum transport, significantly reducing the risk of cross‑contamination and enhancing the drum’s reuse rate. Furthermore, the material used in this round‑bottom bag is environmentally friendly, recyclable, and economically advantageous.

　　Custom-made round-bottom bags tailored to the bucket diameter offer the following advantages:

　　1. The round-bottom bag fits snugly against the bucket’s sidewalls and bottom, maximizing space utilization; for a given volume, it can hold more product, thereby effectively reducing storage and transportation costs.

　　2. Because the container is custom‑made to match its shape, the pressure from the product’s bottom and sides is entirely transferred to the base and inner sidewalls, making the edges less prone to cracking. This provides more effective protection for the product.

　　3. This bag is specially customized to enhance the perceived premium of the packaging and highlight the quality of the packaged product.

Conductive inner bag

Round-bottom bag / Multi-layer co-extruded round-bottom bag

Round-bottom pouch / Aluminum-plastic composite round-bottom pouch

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