Industrial processes that require dosing material from a bag into mixers, hoppers, or production lines demand a container with controlled discharge at the base. This big bag with a double valve —top loading and bottom discharge, also called a double-valve FIBC or discharge super sack— is manufactured by Fortemo from virgin woven polypropylene with an inner liner, and is the professional format for operations where the bag is not cut but emptied and reused.
Key Benefits
- Dosed and Clean Discharge: Bottom valve allows content to be released directly into hoppers, mixers, or process lines without opening the bag, maintaining traceability and reducing dust generation.
- Controlled Top Loading: Loading valve compatible with automated packaging systems, ideal for connecting to plant spouts or bulk filling tubes.
- Insulating Inner Liner: Plastic barrier that protects the content from the outer fabric and blocks moisture, cross-contamination, and fine migration.
- Operational Reusability: By not being cut when emptied, the bag can return to the packaging line in closed process cycles, a real advantage over disposable bags.
- Fortemo Professional Grade Fabric: Virgin polypropylene with UV treatment and industrial stitching on handles, base, and stress areas, sized with a 5:1 safety factor.
Applications and Typical Uses
- Industrial processes with dosing to hoppers or mixers (cement, mortar, gypsum, dry aggregates).
- Packaging and discharge of granulated fertilizers in agroindustry.
- Handling of chemical raw materials, pigments, pelletized polymers, and resins in plants.
- Mining operations, fine aggregates, and mineral processing.
Quality and Durability
The double valve is an expensive solution in generic format because it requires precise assembly and well-finished additional seams; a poorly manufactured bag fails at the discharge valve area, not the main fabric. Fortemo reinforces both valves with industrial stitching and an inner sleeve, and verifies the 5:1 safety factor on the assembly. For plants that package and empty the same bag multiple times, the difference between a premium FIBC and an economic one is measured by the number of cycles before failure.
Double-spout is the right choice when the sack is to be emptied in a controlled manner into a hopper, mixer or process line, and when the sack is to be reused several times. For simple storage or one-off transport, an open-mouth sack or one with a single top spout serves the same purpose. If the operation requires dosing product without cutting the sack and refilling, double-spout justifies its use within just a few cycles.
In controlled operations (clean discharge, no sharp materials, indoor storage between uses), a premium double-spout big bag holds up across several fill-and-empty cycles without losing structural integrity. Real life depends on the type of material, the discharge speed and how the sack is handled with crane or forklift. What is built in by design is that the format is intended for reuse, not single use.
Yes — this is precisely one of its main applications. The internal liner blocks fine particle migration through the fabric, and the upper spout allows hopper connection without dust escaping into the room. The lower spout, once closed with its drawcord, keeps the material confined during transport. For critical pulverized product (talcs, fine pigments, cement), this is the technically correct format.
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| UV protection | Yes (high) |
|---|---|
| Color | White fabric and black handles |
| Big bag dimensions | 90x90x110 cm (35.4x35.4x43.3 in) |
| Construction type | U-Panel |
| Base type | With discharge valve |
| Top opening type | Loading valve |
| Lifting loop type | Cross corner loops, 40 cm (16 in) free length |
| Document pocket | Yes |
| Safety factor (SF) | 5:1 |
| Safe working load (SWL) | 1500 kg (3306.9 lb) |
| Valve style | Cross-shaped opening / star closure |
| Valve dimensions | 40x50 cm (15.7 x 19.7 in) |
| Liner material | LLDPE (linear low-density polyethylene) |
| Liner finish | Sewn to the outer layer |
| Liner | Yes |
| Package: Width | 110.0 cm (43.31 in) |
|---|---|
| Package: Height | 54.0 cm (21.26 in) |
| Package: Depth | 55.0 cm (21.65 in) |
| Package: Weight | 75.0 kg |
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