Internally Coated Spout Graphite Powder FIBC Bags for Fine Powder Filling

Product Positioning

These Internally Coated Spout Graphite Powder FIBC Bags are designed around a common fine-powder handling concern: dust appearing near the filling and discharge interfaces.

The main bag body uses 180 g/m² uncoated woven fabric, while the top filling spout and bottom discharge spout use 100 g/m² internally coated fabric. This localized coating helps reduce the direct passage of fine powder through the woven structure of the spout fabric.

The coated spouts are only one part of interface dust control. Actual performance also depends on equipment connection, clamping, liner positioning, tie closure, filling speed and the dust-extraction system. The bag should not be described as completely dust-free or leak-proof without relevant testing.

Why Dust Appears Around Filling Interfaces

After grinding or classification, fine graphite particles may move toward the filling connection because of material impact, filling airflow or air displaced from inside the bag.

Common causes include:

• A mismatch between the filling pipe and spout dimensions;
• The filling spout not fully covering the equipment outlet;
• Uneven pressure from the spout clamp;
• Misalignment of the inner-liner filling neck;
• Excessive filling speed;
• Incorrect closure of the spout tie;
• A gap between the discharge spout and receiving hopper.

Fine-powder control therefore requires attention to both material construction and equipment interfaces.

How the Localized Coating Is Used

The localized coating is applied at the points where the graphite powder enters and leaves the bag. It does not convert the entire outer bag into a coated FIBC.

Applications Related to Fine Powder Filling

Collection after graphite grinding

The bag can collect fine graphite powder discharged from grinding or milling equipment. The top filling spout can be connected to the equipment outlet to reduce open exposure during filling.

Filling beneath classification equipment

It can be positioned beneath screening, classification or cyclone-collection equipment to receive graphite powder after particle-size separation. The equipment outlet and filling-spout dimensions must be checked before use.

Batch weighing and filling

The bag is suitable for production lines that fill graphite powder according to a specified batch weight. Its rated load is 1000 kg, while the required volume depends on the bulk density of the powder.

Transfer between processing stages

It can transfer fine graphite powder from grinding or classification to blending, temporary storage or downstream processing. The inner liner separates the powder from the uncoated outer body.

Controlled discharge into a receiving hopper

The bottom discharge spout can connect with a receiving hopper, silo or processing machine. The operator can control material release through the spout tie and the downstream feeding arrangement.

Covered bulk transportation

After filling and closing the spouts, the bag can be used for covered industrial transportation. Because the main body is uncoated and no waterproof test is provided, protection from rain is still required.

Interface Troubleshooting

Technical Specifications

Interface Checklist Before Filling

1. Confirm the diameter and length of the filling pipe.
2. Check whether the filling spout fully covers the equipment outlet.
3. Confirm that the clamp secures both the liner neck and outer spout evenly.
4. Check that the liner neck is not twisted or displaced.
5. Set the filling speed according to powder flow and particle characteristics.
6. Determine whether a separate dust-extraction connection is required.
7. Confirm that the bottom outlet matches the receiving hopper.
8. Remove residual powder from the spout before tightening the tie.