1760 N Fabric Strength Nickel Sulfate FIBC Bag With Four Cross-Bottom Lifting Belts

Lifting Risk Is Not Limited to Lifting-Belt Strength

During forklift or mechanical lifting of a one-tonne powder bag, the main concern is not only whether the lifting belts are strong enough. It is also whether the load can be transferred evenly from the four lifting points to the bag body and bottom.

Twisted belts, unequal lifting-point tension, or off-center material can create localized loading. Even if the lifting belts remain intact, additional stress may develop around the bag corners, sewn belt sections, and bottom connections.

This nickel sulfate FIBC uses four 7 cm wide cross-bottom lifting belts. The belts extend along the corners and cross beneath the bottom to form an integrated supporting structure. The bag fabric has a specified minimum strength of 1760 N in both the warp and weft directions to accommodate force transferred from the belts into the woven body.

How Cross-Bottom Lifting Belts Transfer the Load

Cross-bottom lifting belts are not connected only to the upper body or a localized side-wall area. They extend down the bag corners and cross beneath the bottom, positioning the filled bag above a supporting belt structure.

The load path can be described as follows:

1. Forklift forks or lifting equipment apply upward force to the four loops;
2. Tension travels down the belts toward the corners and bottom;
3. The crossed belts provide support beneath the filled bag;
4. The bottom, body, lifting belts, and sewn connections participate in load transfer.

Compared with a design where lifting connections are concentrated in localized body areas, the cross-bottom arrangement extends the load path beneath the bag. It does not eliminate the need for symmetrical lifting. All four loops should be engaged without twisting and brought under load as evenly as practical.

The lifting belts measure 7 × 278 cm, and the loop height is approximately 45 cm. Available connection space should be checked against the dimensions of the forklift forks, hooks, or lifting beam.

Why 1760 N Fabric Strength Still Matters

The cross-bottom belts carry and transfer the main lifting load, but the woven body remains subject to multidirectional forces. During initial lifting, turning, stopping, and positioning, the material may shift slightly and transfer force through the bottom and corners into the bag body.

The specified base-fabric strength is:

• Warp direction: ≥1760 N
• Weft direction: ≥1760 N

Using the same minimum requirement in both directions helps control the directional properties of the woven body. When the filled bag is suspended, its body must accommodate force transferred from the belts, lateral pressure from the material, and localized stress around connection areas.

The 1760 N value applies to the base fabric. It does not represent lifting-belt strength or finished-bag lifting performance. The production sheet does not provide a lifting-belt breaking-strength value, safety factor, or complete finished-bag lifting results. These items should be confirmed separately through order specifications and testing.

Handling Stage | Main Load Risk | Relevant Bag Feature

The structure provides a continuous load-transfer path but does not replace controlled lifting speed, correct loop engagement, or site-specific handling procedures.

Main Specifications

Where This Structure Is More Useful

Initial Movement After Filling

Immediately after filling, the material may not have settled completely, and the bag shape and center of gravity can still change. During the first lift, the load should be applied gradually so that all four belts become tensioned and visible leaning can be identified.

The cross-bottom configuration is relevant where the filled bag must be moved from the filling station to weighing, inspection, or temporary-storage areas.

Frequent Forklift Transfer

Where bags are repeatedly moved between production, warehouse, and loading areas, the four loops are engaged with the forklift forks multiple times. Fork spacing, fork-edge condition, loop height, and possible belt twisting should be checked under these conditions.

Frequent transfer does not automatically mean that the bag is classified as reusable. Reuse must be determined from the product category, use history, and finished-bag testing.

Lifting Before Truck or Container Loading

Before loading into a truck or container, the bag may be raised from the floor or pallet to the vehicle loading position. Where the lifting route includes turning, height adjustment, or temporary suspension, bag swing should be controlled and tension kept relatively even across all four lifting points.

Warehouse Transfer

Warehouse handling may involve narrow aisles, pallet placement, shelving, and repeated positioning. The cross-bottom belts create a continuous supporting path from the loops to the bottom, but collisions with racks, walls, or adjacent packages should still be avoided.

Positioning Before Discharge

When the filled bag is positioned above discharge equipment, its center of gravity and belt angles may change. The bag should be stabilized before opening the bottom outlet to avoid discharging while the bag is swinging or unevenly suspended.

Lifting Conditions to Confirm Before Ordering

1. Target Load

Confirm the target net weight, filling tolerance, and material bulk density. The current production specification states a 1000 kg load and should not be used as evidence for heavier filling.

2. Lifting Method

Specify whether the bag will be handled by forklift, hooks, a lifting beam, or another device. Each method places different requirements on loop spacing, belt angles, and connection clearance.

3. Forklift Fork Spacing

Provide fork spacing, width, thickness, and usable length. The fork arrangement should engage all four loops without causing them to slip or fold locally.

4. Belt Length and Loop Height

The current belts measure 7 × 278 cm, with an approximately 45 cm loop height. Confirm that these dimensions match the existing forklift or lifting equipment.

5. Cross-Bottom Structure Requirement

Where the filled bag will be lifted or frequently transferred after filling, confirm whether a cross-bottom arrangement is required. Belt placement should be coordinated with the bag bottom, discharge spout, and pallet design.

6. Transfer Frequency

Provide the expected number of lifts, transfer distance, temporary-storage period, and handling route. Transfer frequency affects inspection requirements for the belts, seams, and body but does not by itself determine whether the FIBC is reusable.