The Benefits of Buying Jumbo Bags Directly from the Manufacturer

17/07/2026

A jumbo bag is much more than a large woven polypropylene sack. It is an industrial packaging system engineered to safely contain, lift, store and transport hundreds or even thousands of kilograms of bulk materials.

For an FIBC to perform reliably in real operating conditions, every component must be carefully controlled. These components include the PP yarn, woven fabric, lifting loops, coating, liner, seams, filling inlet, discharge outlet and printed identification.

At Kanetora Bach Dang, the jumbo bag manufacturing process is organized into eight major stages, covering everything from polypropylene yarn extrusion and fabric weaving to sewing, quality inspection, packing and warehouse release.

This vertically integrated process allows the factory to maintain better control over product consistency, production schedules and customization for different industries and export markets.

Businesses that are new to this packaging format can first read our guide on what a jumbo bag is, its structure and industrial applications.

Quick Answer: How Are Jumbo Bags Manufactured?

The standard FIBC jumbo bag manufacturing process includes eight key steps:

Polypropylene yarn extrusion
Fabric weaving
Lifting belt weaving
Lamination or coating
Cutting and printing
Sewing and assembly
Cleaning and quality inspection
Baling, packing and warehouse release

Depending on the product being packed and the operating environment, manufacturers may adjust the fabric weight, bag construction, lifting-loop design, coating, inner liner, filling and discharge options, dust-proofing features or electrostatic protection.

Technical note: Fabric weaving and lifting-belt weaving are separate semi-finished production streams that can operate simultaneously. Their numerical order in a production diagram may therefore vary without changing the actual manufacturing logic.

Kanetora Bach Dang’s corporate presentation also defines the production flow as an eight-stage system covering extrusion, fabric and belt weaving, coating, cutting, sewing, inspection and packing.

Why Does the Manufacturing Process Matter?

During filling, storage and transportation, an FIBC may be exposed to several types of mechanical and environmental stress:

Concentrated lifting forces around the lifting loops
Internal pressure against the bag body and bottom
Friction during filling, discharge and handling
Vibration during road or sea transportation
Stacking pressure inside warehouses and containers
Moisture, dust, sunlight and temperature changes
Electrostatic charge generated by certain powders or chemicals

For this reason, FIBC quality cannot be judged by appearance alone.

Two bags with the same dimensions and nominal Safe Working Load may perform very differently if their yarn strength, fabric construction, webbing quality, seam design or manufacturing controls are not equivalent.

A standardized manufacturing process helps identify deviations early, reduce recurring defects and maintain consistency across different production batches. It is also one of the most important factors buyers should examine when evaluating the capabilities of a jumbo bag factory in Vietnam.

The 8-Step FIBC Jumbo Bag Manufacturing Process

Step 1: Polypropylene Yarn Extrusion

The production process begins with polypropylene resin, commonly known as PP granules.

Depending on the technical requirements of the order, the resin may be blended with color masterbatch, UV stabilizers or other functional additives before entering the extrusion system.

The material is heated and melted before being formed into a thin PP film. This film is then slit into narrow tapes, stretched under controlled conditions and wound onto bobbins.

The stretching process improves molecular orientation and gives the PP tapes the tensile characteristics required for industrial woven fabric.

Important parameters at this stage include:

Yarn denier
Tape width
Tensile strength
Elongation
Color consistency
Additive concentration
Winding consistency
Stability during weaving

Yarn quality directly affects the strength of the bag fabric and lifting webbing. Uneven, brittle or poorly stretched yarn may create weak areas and inconsistent load-bearing performance.

For bags intended for outdoor use, UV stabilizers may be added during material preparation. UV resistance can subsequently be evaluated using accelerated weathering equipment.

Step 2: PP Fabric Weaving

The extruded PP tapes are transferred to weaving machines to produce woven polypropylene fabric.

Depending on the required FIBC construction, the factory may manufacture:

Tubular fabric for circular FIBCs
Flat fabric for U-panel bags
Flat panels for four-panel bags
Baffle fabric for form-stable bags
Top and bottom panels
Lightweight fabric for filling and discharge spouts

Different parts of a jumbo bag may require different fabric weights and mechanical properties.

The body must withstand outward pressure from the packed material, while the bottom and lifting-loop attachment areas must support the design load during handling.

Typical inspection criteria include:

Fabric weight in grams per square metre
Fabric width
Warp and weft density
Tensile strength in both directions
Surface consistency
Broken or missing tapes
Weaving gaps
Fabric flatness
Suitability for coating and printing

Bag structure also affects how the fabric is manufactured.

For example, U-Panel FIBC bags use one continuous U-shaped panel to form the bottom and two opposite sides. In contrast, circular FIBC bags use a tubular woven body with fewer vertical seams.

Step 3: Lifting Belt Weaving

The lifting loops or webbings are among the most important load-bearing components of an FIBC.

When a filled jumbo bag is lifted by a forklift or crane, the load is transferred from the contents through the bag body and into the lifting-loop attachment areas.

Lifting options may include:

Standard corner loops
Cross-corner loops
Corner-seam loops
Stevedore loops
Double-loop systems
Single-point lifting arrangements
Mono-straps for selected sling-bag applications

The webbing specification must define its width, thickness, weight, tensile strength, color and free-loop length.

A lifting loop must not only be strong enough. It must also be compatible with the bag construction, handling equipment and operating method used by the customer.

Proper loop design can improve forklift access, reduce twisting and help distribute lifting forces more evenly.

Kanetora Bach Dang operates dedicated webbing-weaving equipment and also manufactures several semi-finished FIBC components in-house. This improves control over product consistency and production lead time.

Step 4: Lamination or Coating

Not every jumbo bag requires coating.

Lamination is generally applied when the packed material requires improved:

Dust containment
Resistance to powder leakage
Moisture protection
Fabric tightness
Printability
Storage and transport protection

During this process, a layer of molten polymer is applied to one or both surfaces of the woven fabric.

The production team must control:

Coating weight
Coating thickness
Adhesion
Surface coverage
Uniformity across the fabric width
Pinholes or uncoated areas
Suitability for cutting and sewing

Coating reduces the gaps between the woven tapes, but it does not always replace an inner liner.

For moisture-sensitive materials, very fine powders, food ingredients or chemicals requiring a higher barrier level, coated fabric may be combined with a PE, PP or multilayer liner.

The decision between coated and uncoated fabric should therefore be based on product characteristics, filling and discharge methods, storage conditions and logistics requirements—not only packaging cost.

Step 5: Fabric Cutting and Printing

After weaving and coating, the fabric is cut into individual components according to the approved technical drawing.

These components may include:

Main body panels
Bottom panels
Top panels
Filling spouts
Discharge spouts
Baffle panels
Reinforcement pieces
Duffle tops
Protective flaps

Automatic cutting systems improve dimensional accuracy and reduce variation between components.

Cutting precision affects the final bag dimensions, seam positions, shape retention and stability after filling.

The required identification is then printed according to the customer-approved artwork.

Printed information may include:

Customer logo
Product name
Safe Working Load
Safety Factor
Product code
Batch number
Lifting instructions
Handling warnings
Traceability details
Mandatory symbols
Recycling or disposal information

Before mass production, the artwork should be checked for wording, dimensions, colors, orientation and position on each side of the bag.

For regulated or hazardous products, marking requirements may be considerably more detailed. Buyers in these industries can also review the specifications of UN Certified Bulk Bags.

Step 6: Sewing and Final Assembly

During the sewing stage, the individual semi-finished components are assembled into a completed FIBC.

Depending on the bag design, sewing operations may include:

Joining the body and bottom
Attaching lifting loops
Sewing the filling inlet
Sewing the discharge outlet
Installing baffle panels
Attaching closure ties
Adding protective flaps
Installing document pouches
Attaching labels
Inserting or fixing an inner liner

Common stitch constructions may include lock stitch, chain stitch, overlock sewing and other application-specific seam designs.

High-stress areas require particular attention, especially:

Lifting-loop attachment zones
Bottom seams
Main body joints
Spout connections
Reinforced corners
Baffle attachment points

Stitch density, thread type, seam allowance and reinforcement patterns must follow the approved manufacturing specification.

For fine powders, additional dust-proof cords or sealing materials may be used along the seams to reduce leakage.

Sewing quality depends on more than machinery. It also relies on operator skill, clear work instructions, approved samples and continuous in-line QC supervision.

Step 7: Cleaning and Quality Inspection

Quality control should not begin only after the bag has been completed.

In a comprehensive QC and QA system, critical characteristics are monitored throughout raw-material preparation, yarn extrusion, weaving, coating, cutting, printing and sewing.

After assembly, finished bags may undergo:

Removal of loose threads
Cauterization of thread ends where applicable
Air blowing
Surface cleaning
Micro-dust removal
Internal and external visual inspection
Metal detection when required
Liner inspection using a light table
Dimensional inspection
Seam and loop-position checks
Printing and label verification
Comparison against the approved sample
Packing-quantity verification

Kanetora Bach Dang’s published manufacturing information describes quality control as a dual-layer system: QC personnel perform in-process inspection, while a dedicated QA function conducts final checks before shipment. The factory also lists testing equipment for tensile strength, UV resistance, top-lift performance, liner seal strength, puncture resistance and coefficient of friction.

What Is the Difference Between QC and QA?

Quality Control, or QC, focuses on inspecting products and semi-finished components to identify defects or deviations.

Quality Assurance, or QA, focuses on the management system, documentation, procedures, standards and preventive controls used to reduce the risk of defects.

When QC and QA operate together, problems can be detected and corrected before they affect an entire production batch.

Step 8: Baling, Packing and Warehouse Release

After passing final inspection, the FIBCs are folded, counted and compressed into bales.

Packing arrangements can be customized according to:

Number of bags per bale
Bale dimensions
Bale weight
Pallet requirements
External wrapping
Container-loading plan
Customer warehouse conditions
Unloading method at destination

For products requiring a higher level of hygiene control, packing should take place in a suitable controlled area to reduce dust exposure and prevent recontamination after inspection.

Each bale should carry clear identification, such as:

Product code
Batch number
Quantity
Production date
Purchase-order reference
Traceability information

Warehouse controls are also important because several FIBC orders may look similar while having different fabrics, liners, prints, lifting loops or discharge structures.

Clear labeling and location management reduce the risk of mixing products during storage and container loading.

Does the Process Change for Different FIBC Applications?

The basic eight-step process remains similar, but materials, specifications and inspection requirements vary considerably according to the packed product.

FIBCs for Minerals and Construction Materials

These applications normally prioritize:

High load-bearing performance
Fabric tensile strength
Tear resistance
Strong lifting loops
Abrasion resistance
Efficient filling and discharge
Competitive packaging cost per tonne

The bag structure must also be selected according to material density, particle size and handling conditions.

FIBCs for Plastic Resins and Chemicals

Common requirements include:

Contamination control
Moisture protection
Inner liners
Controlled discharge
Dust containment
Product-code traceability
Electrostatic protection where necessary

For hazardous chemicals, packaging may also require specific certification and testing. UN Certified Bulk Bags are developed for regulated dangerous-goods applications and must follow the relevant approved design and marking requirements.

Food-Grade FIBCs

Food and agricultural applications typically require tighter controls over:

Raw materials
Personnel hygiene
Production-area cleanliness
Dust and foreign-object control
Finished-bag cleaning
Metal detection where specified
Liner suitability
Controlled packing
Traceability

Food-grade production requirements should be clearly defined according to the product, destination market and customer quality system.

The Bachdang.vn product portfolio includes dedicated food-grade FIBC options alongside standard, baffle, electrostatic and UN-certified designs.

Baffle Bags for Optimized Container Loading

A standard FIBC tends to bulge outward after filling.

A baffled FIBC bag includes internal panels that help the bag maintain a more rectangular shape.

This structure can support:

More stable stacking
Better pallet utilization
Improved container-space efficiency
More consistent filled dimensions
A neater appearance after filling

The baffles must be designed and sewn to allow adequate material flow while controlling the final shape of the bag.

Type C and Type D FIBCs for Electrostatic-Risk Environments

Powders flowing into or out of an FIBC can generate electrostatic charge.

In applications involving combustible dust, flammable vapor or sensitive products, the buyer must evaluate:

Product resistivity
Minimum ignition energy
Presence of combustible dust
Presence of flammable gases or vapors
Grounding conditions
Filling and discharge speed
Required FIBC electrostatic type

Type C FIBC bags use conductive or interconnected elements and require effective grounding during operation.

Type D FIBC bags are made from static-dissipative fabric designed to dissipate charge without a conventional grounding connection, subject to the applicable operating conditions and safety assessment.

Selecting an electrostatic FIBC should always be based on a proper risk assessment rather than on product name alone.

Manufacturing Capabilities of Kanetora Bach Dang

Kanetora Bach Dang is a direct industrial packaging manufacturer located in Ninh Binh Province, Vietnam.

The factory’s published production capacity includes approximately:

300,000 FIBC bags per month
10 million block-bottom valve bags per month
500 tonnes of multilayer plastic film per month

The facility operates equipment for PP yarn extrusion, fabric weaving, webbing weaving, coating, automatic cutting, printing, sewing, liner production, cleaning, inspection, baling and laboratory testing.

Its manufacturing system also covers several internally produced semi-finished components, including webbings, liners, labels and document pouches. This level of integration can help the factory:

Improve control over incoming components
Reduce dependence on external suppliers
Shorten development lead times
Customize materials and structures
Maintain more consistent production batches
Respond more flexibly to special orders

The company’s 2026 introduction lists machinery for yarn extrusion, fabric and webbing weaving, coating, automatic cutting, sewing, liner production, metal detection, tensile testing, UV testing and top-lift testing.

What Information Should Buyers Provide for a Jumbo Bag Quotation?

Accurate input information helps the factory recommend the right bag and prepare a more reliable quotation.

1. Product to Be Packed

Specify whether the material is a powder, granule, pellet, flake, crystal or other form.

Important properties include:

Bulk density
Particle size
Moisture sensitivity
Dust generation
Flow characteristics
Temperature
Chemical compatibility
Electrostatic risk

2. Required Filling Weight

Common requirements may include:

500 kg
1,000 kg
1,250 kg
1,500 kg
2,000 kg
Custom working loads

The Safe Working Load must be considered together with the required Safety Factor and operating method.

3. Bag Dimensions

Provide the required length, width and height.

Dimensions should be checked against:

Filling equipment
Pallet dimensions
Warehouse racking
Truck or container space
Stacking requirements
Discharge equipment

4. Bag Construction

Available options may include:

U-panel
Four-panel
Circular
Baffle
Sling bag
Customer-specific structures

5. Filling and Discharge Design

Filling options may include:

Open top
Duffle top
Filling spout
Flap top

Discharge options may include:

Flat bottom
Discharge spout
Conical outlet
Full-open bottom
Iris closure

6. Material and Protection Requirements

Clarify whether the bag requires:

Coated or uncoated fabric
Inner liner
UV stabilization
Dust-proof seams
Moisture protection
Food-grade controls
Electrostatic protection
Barrier-film liner

7. Printing and Traceability

Provide requirements for:

Logo
Print colors
Warning text
Product code
Batch number
Labels
Document pouch
Barcode or QR code
Country-specific markings

8. Transport and Storage Conditions

The manufacturer should understand:

Domestic or export shipment
Road, rail or sea transport
Storage duration
Outdoor exposure
Destination climate
Container-loading method
Customer unloading conditions

The more complete the technical information, the easier it is to reduce sampling revisions and prevent issues during commercial production.

Conclusion

The jumbo bag manufacturing process is an interconnected production system that starts with polypropylene resin and ends with inspected, packed and shipment-ready FIBCs.

Every stage—including yarn extrusion, fabric weaving, lifting-belt production, coating, cutting, printing, sewing, cleaning and quality inspection—directly affects the bag’s strength, cleanliness, safety and suitability for its intended application.

With an integrated production system, in-house semi-finished component manufacturing, dedicated QC and QA controls and flexible customization capabilities, Kanetora Bach Dang develops FIBC solutions for different products, operating environments and international markets.

Businesses seeking a direct FIBC and jumbo bag manufacturer in Vietnam can work with Kanetora Bach Dang to evaluate product characteristics, define the correct specification and develop packaging suitable for commercial production.

Frequently Asked Questions

What Are Jumbo Bags Made From?

Most FIBC jumbo bags are manufactured from woven polypropylene.

Depending on the application, the bag may also include coated fabric, a PE or PP liner, UV additives, anti-static materials, conductive elements, labels, document pouches and other customized accessories.

What Are the Main Steps in the FIBC Manufacturing Process?

The main steps are polypropylene yarn extrusion, fabric weaving, lifting-belt weaving, coating, cutting and printing, sewing, cleaning and quality inspection, followed by final packing.

Why Must FIBC Lifting Loops Be Carefully Controlled?

The lifting loops transfer the load when the bag is handled by a forklift, crane or other lifting equipment.

Insufficient webbing strength, incorrect loop dimensions or poor attachment sewing may affect handling safety.

Do All Jumbo Bags Need Coating?

No.

Uncoated fabric may be suitable for materials that require breathability or do not generate fine dust. Coated fabric is generally used when improved moisture resistance, dust containment or printability is required.

Can Coating Replace an Inner Liner?

Not in every application.

Coating reduces the openings between woven PP tapes, while a liner creates a separate protective layer inside the bag. Fine powders, moisture-sensitive products and high-barrier applications may require both.

Can Jumbo Bags Be Manufactured in Custom Sizes?

Yes.

A manufacturer can customize dimensions, fabric weight, bag construction, lifting loops, filling inlet, discharge outlet, coating, liner, colors, printing and traceability features.

What Is the Difference Between Food-Grade and Standard FIBCs?

Food-grade FIBCs generally require tighter controls over raw materials, production hygiene, foreign-object prevention, cleaning, inspection, packing and traceability.

The exact requirements depend on the food product, customer standard and destination market.

What Is Checked Before FIBC Bags Are Shipped?

Typical final checks include:

Bag dimensions
Fabric and component conformity
Sewing quality
Lifting-loop position
Filling and discharge construction
Liner condition
Printed information
Labels and traceability
Internal cleanliness
Packing quantity
Customer-specific requirements