Two-Loop / Half-Lift FIBC Bulk Bags

Two-loop FIBC bulk bags, commonly known as half-lift bags, are integrated packaging solutions designed for efficient mechanical handling via cranes, forklifts, and overhead hoists. Unlike traditional four-loop bags, the two lifting loops of a half-lift FIBC are formed directly from the continuation of the bag body fabric itself or integrated as a single-point/two-point suspension system.

This architecture is optimized for bulk materials—such as high-density granules, chemical powders, agricultural feeds, and mineral ores—where automated filling lines and rapid crane hook engagement are central to logistics efficiency. The reinforced body design ensures structural integrity under continuous lifting stresses, making them ideal for high-throughput filling and transport environments.

Two-loop FIBC bags are commonly customized and utilized with:

• PE Internal Liners (Form-fit or tubular)
• Aluminum Foil Composite Liners
• Filling Spouts
• Discharge Spouts (with petal closure or star closure)
• Document Pouches
• Conical Tops
• Dust-Proof Seams (Sift-proof felt piping)

Why Choose Two-Loop (Half-Lift) FIBC Bags?

Efficient Crane Hook and Forklift Engagement

The primary operational advantage of a two-loop bag is the simplification of the lifting process. Forklift operators or crane handlers do not need to manually position four separate loops onto blades or hooks. The two large, prominent loops automatically bridge together at a single pick-up point, reducing truck and vessel loading cycle times.

High Strength-to-Weight Fabric Ratio

The loops are typically formed by extending the body fabric or through specialized vertical wrap reinforcement. This means the lifting stress is distributed down the entire profile of the bag walls rather than being concentrated on four small stitched corners. This minimizes the risk of fabric tearing at attachment points during sudden vertical acceleration.

Optimized for Low-Clearance and Automated Filling Stations

Because the loops arch naturally over the top of the bag, they interface seamlessly with automated filling spouts and hook suspension systems used in large-scale manufacturing facilities. This structure allows the bag to hang perfectly vertical during the filling phase, ensuring uniform material distribution and dense packing.

Custom Component Matching Available

Depending on the flow characteristics and moisture sensitivity of your material, we can configure these bags with specialized filling and emptying mechanisms. For high-purity chemical powders, internal liners can be pre-installed to prevent contamination and material sifting through the seams.

Product Specifications

Common Structural Variations

Standard Open-Top Two-Loop Bags

Designed for rapid filling of low-value bulk materials like aggregates, sand, and crude minerals where moisture protection during the loading process is not a primary constraint.

Filling & Discharge Spout Two-Loop Bags

Equipped with customized top and bottom spouts to connect directly with closed industrial conveying lines. This prevents dust emission during filling and allows controlled, low-residue emptying.

Two-Loop Bags with Aluminum Foil Liners

Configured specifically for sensitive, high-value materials like lithium battery cathode powders or flame retardants. The high-strength outer PP bag provides structural lifting support, while the internal aluminum liner isolates the material from moisture, oxygen, and static buildup.

Coated (Laminated) Two-Loop Bags

The polypropylene fabric is treated with a micron-thin layer of PP film to seal the weave gaps. This provides a baseline layer of moisture resistance and prevents fine chemical granules from sifting through the fabric holes.

Industrial Applications

Chemical and Engineering Plastics

Used for transporting nylon granules, polymer resins, flame retardants, and chemical additives. The integrated loops allow raw material bags to be hung directly over extrusion or compounding hoppers.

Renewable Energy & Battery Materials

When combined with advanced multi-layer barrier liners, two-loop bags protect highly reactive materials like lithium carbonate and precursor powders from degradation caused by atmospheric moisture during transit.

Mineral Processing & Metallurgy

Suitable for heavy-duty storage of industrial sand, quartz, limestone, rare earth concentrates, and non-ferrous metal powders. The robust loop design accommodates high-density loads without structural failure.

Agricultural Bulk Feeds

Ideal for the automated processing, storage, and cross-docking of wholesale animal feeds, grain harvests, and bulk agricultural supplements where quick crane manipulation is required in port terminals.

Two-Loop Bags vs. Four-Loop Bags: Operational Differences

Key Considerations for Material Compatibility and Ordering

Material Bulk Density and Sizing

The volumetric capacity of the bag must match the bulk density of your specific material. A bag designed for 1 ton of high-density mineral ore will be physically smaller than a bag designed for 1 ton of lightweight nylon granules. Providing accurate bulk density ensures correct bag sizing.

Thread Alignment and Sift-Proofing

For ultra-fine chemical powders, standard sewing needles leave puncture holes along the seams that can lead to product leakage. In these scenarios, the integration of filler cords or felt sifting-barrier bands must be specified during the engineering stage.

UV Exposure and Storage Conditions

If the bags are to be stored in outdoor staging areas, port docks, or open facilities, the polypropylene material must be treated with specific UV-stabilizing additives to prevent polymer degradation and loss of tensile strength from solar radiation.

Quality Control & Testing Protocol

To ensure the safety of ground personnel and transport machinery, our half-lift FIBC production follows rigid mechanical testing steps:

• Tensile Strength Testing: Verifies the breaking point of both the body fabric and the integrated lifting webbing.
• Cyclic Top-Lift Testing: The bag is loaded to its nominal capacity and subjected to repeated vertical lifts to simulate real-world crane handling.
• Topple & Drop Tests: Evaluates the structural integrity of the base seams when dropped from specified heights onto flat surfaces.
• Sift and Leakage Inspection: For powder-grade configurations, seams and spouts are inspected under pressure to confirm seal integrity.

Packaging & Export Logistics

Bulk bags are highly volumetric products when empty. To optimize container space and minimize your international freight costs, we utilize industrial hydraulic baling presses:

• Compressed Pallet Packing: Allows up to several hundred collapsed bags to be stacked securely per pallet, preventing shifting inside ocean containers.
• Custom Labeling: Every batch can be equipped with weatherproof tracking tags showing Safe Working Load (SWL), safety factors, production dates, and batch codes for corporate compliance tracing.

Frequently Asked Questions

1. How do you prevent powder leakage through the seams?

For fine materials like flame retardants, we use sift-proof felt piping along the stitched seams to block needle holes. For high-purity powders like lithium, we recommend adding an internal liner.

2. Can these bags be double-stacked in shipping containers?

Yes, for stable materials like mineral ores or pellets. However, if you are shipping fluid-like fine powders and must maximize 40ft container space, a 4-Panel or Baffled bag is a more stable option.

3. Can I get these bags with moisture barriers?

Yes. We can pre-install standard PE liners for baseline humidity protection, or multi-layer aluminum foil liners for strict oxygen and moisture isolation.

Request a Technical Review

If you do not have exact technical specs, simply share your basic logistics requirements below for a quick quote and recommendation:

1. What material will you be loading? (e.g., Lithium powder, nylon pellets, flame retardants)
2. What is your target weight per bag? (e.g., 1,000kg, 1,500kg)
3. How will the bags be lifted? (e.g., Crane, hoist, or forklift)
4. Does your material need strict moisture protection? (Yes / No)

Our technical team will review your application and provide structural layout options.

• Email: [email protected]
• Technical Inquiry: Contact Our Engineering Team
• Direct Line: +86 15232851009