User guide | Big bag with filling and discharge spout
This guide covers the use of the big bag with loading spout and discharge spout: prior visual inspection, positioning on a 1.0 × 1.2 m pallet, controlled filling through the top spout, closing and lifting, and metered discharge through the bottom spout. Follow these steps to operate one of the most demanding and versatile formats on the market: clean loading from a hopper and controlled discharge without opening the bag.
Product specifications
The big bag with loading spout and discharge spout is offered in a single configuration, optimized for industrial processes with metered dosing. The following table sets out the complete technical specifications of the only available variant:
| Specification | Value |
|---|---|
| SKU | 745235 |
| Material | Woven virgin polypropylene |
| Dimensions | 90 × 90 × 110 cm (3 × 3 × 3.6 ft) |
| Load capacity | 1500 kg (3300 lb) |
| Safety factor | 5:1 |
| Inner liner | Yes (included) |
| Loading opening | Top spout (filling sleeve) |
| Discharge system | Bottom spout (emptying sleeve) |
| Lifting loops | 4 reinforced corner loops |
| Base shape | Flat bottom |
| Treatment | UV resistance |
| Packaging | Pack of 30 big bags |
If your operation handles several big bag formats at once, the sibling guides may be of interest: the one for the big bag with open top and flat bottom and the one for the big bag with loading spout and flat bottom cover the adjacent formats in the catalog.
Step-by-step usage
The following procedure covers the complete usage cycle from the initial inspection to discharge onto the production line. Follow it in order: each step depends on the previous one, and skipping one compromises the next.
Visual inspection before each use
Before filling the bag, check the four loops one by one, the seams joining them to the base and, above all, the two spouts (loading and discharge). Confirm there are no loose threads, perforations or open seams. Also check the inner liner: any tear compromises the moisture barrier and allows fines to migrate into the outer fabric.
Positioning on a 1.0 × 1.2 m pallet
Place the big bag on a pallet in perfect condition, with the base centered and the four loops extended upward. Unfold the top loading spout and tie it provisionally open so that it receives the flow from the hopper. Make sure the bottom spout is firmly tied and folded against the base, never hanging freely.
Controlled filling through the top spout
Connect the loading spout to the packing tube or hopper opening. Fill at a controlled flow until the bag reaches its full cubic shape. Do not force additional material once the bag takes shape: the 5:1 safety factor is calculated on 1500 kg, not on 1500 kg compressed by overfilling.
Before discharging onto a hopper in the plant, always check that the ring of the bottom spout is free of hardened dry material. A lump of cement or fertilizer jammed in place can prevent the spout from closing completely, and that turns a reusable bag into a single-use one. A wipe with a dry cloth between cycles dramatically extends the service life of the container.
Closing the top spout and lifting
Once full, fold the loading spout inward and tie it with a double loop (not a simple knot, which can give way). Pass the crane hooks or forklift tines through the four loops simultaneously, never through two or three. Lift slowly and check that the bag rises plumb, without leaning to either side.
Metered discharge through the bottom spout
Position the bag over the destination hopper, mixer or silo. Release the tie of the bottom spout with one hand while the other holds the sleeve to control the flow. To stop the discharge, tie the spout again. Once empty, inspect the bag before storing it for reuse in the next packing cycle.
Never lift the big bag with fewer than the four loops hooked, even if it seems that two are enough. The 1500 kg working load is calculated on symmetrical traction at the four points. Lifting with two loops concentrates the force on specific seams and breaks the bag on the first long transport. It is the most expensive and most common mistake on site and in the plant.
Complementary products
To get the most out of your double-spout big bag, consider the following complementary products. Each one covers a specific need in the logistics flow, from diversifying the fleet of bags in the plant to protection during transport:
The big bag with loading spout is the version without bottom discharge, useful when the material is emptied by cutting the bag at the end of the line. The open-top big bag handles bulky loads that do not fit through a spout. The transparent manual stretch film protects the palletized bag during transit, especially useful when the operation crosses docks or moves outdoors. The plastic edge protectors reinforce the four corners of the pallet when the bag is secured with strapping in export operations.
Maintenance and care
If you plan to reuse the bag over several cycles —which is where this double-spout format truly pays off the investment— maintenance between uses is decisive. Store empty big bags folded indoors, on a clean, dry surface, away from direct sunlight. UV radiation degrades polypropylene over time, even in bags with factory UV treatment like this one.
After each cycle, dust off the inner liner by shaking it upside down and pay particular attention to the two spouts: any residue of cement, fertilizer or hardened resin in the sleeve renders them unusable for the next filling. Do not wash the bag with water unless expressly indicated by the manufacturer of the material you are packing, since woven polypropylene absorbs moisture in the seams and weakens the weave if it is not dried completely.
Frequently asked questions (FAQ)
Can I reuse this big bag after one loading and discharge cycle?
Yes, the double-spout format is designed for multiple packing cycles. The key is to inspect the seams, the two spouts and the inner liner before each reuse. If you detect any damage to a spout, the bag becomes single-use: the spout is the critical area that defines the service life of the container.
Is it suitable for fine and abrasive materials such as cement, gypsum or pigments?
Yes, this is precisely one of its main applications. The inner liner isolates the material from the outer fabric and blocks the migration of fines. The top loading spout allows you to connect directly to the plant's packing opening, avoiding dust dispersion during filling, and the discharge spout meters the clean material onto the destination mixer or hopper.
Are the spouts compatible with standard packing systems?
The loading and discharge spouts of the Fortemo big bag follow the usual industrial dimensions, which allows them to connect with most packing openings and hopper funnels on the market. If your installation has a non-standard coupling or a proprietary system, it is advisable to confirm the sleeve diameter before the first cycle. The virtual assistant can help you with that check if you share the reference of your equipment with us.