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QINFENG Custom FIBC manufacturer since 2001

Vertical In-House Manufacturing · Est. 2001

True Vertical FIBC Manufacturing,
From Virgin PP Granules to Tested Bags.

Complete in-house control over tape extrusion, circular weaving, extrusion coating, webbing, precision cutting, multi-color printing, cleanroom sewing, and automated hydraulic baling. Supported by an in-house 1,000-tonne cyclic top-lift testing rig.

Request Manufacturing Specs → View Capability Matrix
  • 100% Virgin Polypropylene Only
  • 10 In-House Production Stages
  • ~1,200,000 Bags Annual Capacity
  • Batch Traceability from Resin to Bale
Years Manufacturing 25+
Annual FIBC Capacity 1.2M
Top-Lift Test Rig 1000 Ton
25 +
Years Manufacturing

Extruding, weaving and assembling in Yantai since 2001

1.2 M
Annual FIBC Capacity

~1,200,000 industrial FIBC bags produced yearly

10 /10
In-House Stages

100% internal tape extrusion, weaving, lamination & assembly

1000 Ton
Top-Lift Test Rig

In-house cyclic safety factor validation (5:1 & 6:1)

Virtual Plant Tour · Vertical Workflow

Inside the Yantai Facility: The 10 Production Stages.

This tour is the process. All ten stages run under our own roof in Yantai, from prime virgin PP granules to the pressed container bale — workshop by workshop, in the order the bag is actually built.

  1. PP Flat Yarn Extrusion & Drawing 960 × 640 px
    Tape Extrusion

    PP Flat Yarn Extrusion & Drawing

    Prime virgin polypropylene resin mixed with high-performance UV stabiliser masterbatch is melted, extruded through slit-die, water-bath quenched, stretched into high-tenacity fibrillated tapes, and annealed to lock in tensile strength.

  2. Heavy Circular & Flat Fabric Weaving 960 × 640 px
    Circular Weaving

    Heavy Circular & Flat Fabric Weaving

    High-output circular looms continuously weave seamless tubular fabric or heavy flat fabric. Laser sensor bars automatically halt the loom upon any warp or weft breakage to ensure zero blind defects.

  3. Extrusion Lamination / Coating Line 960 × 640 px
    Extrusion Coating

    Extrusion Lamination / Coating Line

    For moisture-sensitive and fine-powder applications (cement, starch, chemicals), molten PP/PE film is extrusion-bonded directly to the woven fabric at micron precision under high temperature.

  4. High-Tenacity Lifting Belt Weaving 960 × 640 px
    Lifting Webbing

    High-Tenacity Lifting Belt Weaving

    Lifting loops carry the entire dynamic load during crane and forklift operations. We weave our own high-density belts from high-tenacity multifilament and fibrillated yarns with reinforced edges.

  5. Hot-Knife & Ultrasonic Automated Cutting 960 × 640 px
    Precision Cutting

    Hot-Knife & Ultrasonic Automated Cutting

    Fabric rolls are fed into computerized cutting stations. Hot-knife and ultrasonic sealing instantly melt edges during cutting to prevent fraying and eliminate loose yarn contamination in bulk bags.

  6. Multi-Color Flexographic Printing 960 × 640 px
    Flexo Printing

    Multi-Color Flexographic Printing

    Clear hazard symbols, handling instructions, customer branding, and batch barcodes are printed using eco-friendly water-based inks formulated for high adhesion on polypropylene.

  7. Clean Industrial Sewing & Dustproofing 960 × 640 px
    Sewing & Assembly

    Clean Industrial Sewing & Dustproofing

    Skilled sewing technicians assemble bag panels, spouts, and baffles. Specialized machines run heavy double-chainstitch with integrated single, double, or triple non-woven dustproof felt cords.

  8. Structural Lifting Loop Stitching & Reinforcement 960 × 640 px
    Loop Attachment

    Structural Lifting Loop Stitching & Reinforcement

    Lifting loops are secured with cross-stitch or box-stitch patterns reinforced with internal heavy wear pads. Critical load distribution ensures bags maintain vertical balance under crane hooks.

  9. 100% Visual, Dimensional & Thread Trimming Check 960 × 640 px
    100% Inspection

    100% Visual, Dimensional & Thread Trimming Check

    Every assembled bag passes through dedicated inspection light tables. Quality inspectors trim stray threads, inspect internal cleanliness, check metal detector passes, and stamp approval.

  10. Hydraulic Bale Compaction & Pallet Wrapping 960 × 640 px
    Baling & Packing

    Hydraulic Bale Compaction & Pallet Wrapping

    Bags are hydraulically compressed under high pressure into tight, stackable bales or strapped securely onto heat-treated ISPM 15 wooden/plastic pallets with weatherproof stretch film wrapping.

Transparency & Accountability

Manufacturing Capability Matrix.

We define exactly what is built in our Yantai facility, what control methods govern each line, what proof we can deliver with your shipment, and where operational boundaries lie.

Process Stage Execution Control Method Provided Evidence Capability Limitation
Tape Extrusion
PP flat yarn & fibrillated tapes		 In-House Automatic thickness feedback, gravimetric dosing, denier checks every 2h Yarn tensile log, UV concentration certificate, resin lot COA Minimum tape width 2.0 mm; strictly 100% virgin PP polymer
Circular / Flat Weaving
Tubular & flat fabric (120–260 GSM)		 In-House Laser warp/weft break detectors, electronic pick counter, GSM weighing Fabric tensile test report, roll length certification, GSM report Max tubular layflat width 2,200 mm; max flat fabric width 4,400 mm
Extrusion Lamination
BOPP / PP coating (18–35 GSM)		 In-House Corona treatment station, thermal infrared die gap control, peel test Lamination peel adhesion record, micron thickness log Standard 1-side coating; 2-side coating upon technical consultation
Webbing & Lifting Belts
40–100 mm high-tenacity belts		 In-House Dedicated narrow shuttleless looms, breaking force load sensor checks Belt break test report (up to 3,500 kgf tensile per loop) Heavy reinforcement weave available; custom tracer yarns supported
Precision Cutting
Hot knife, ultrasonic & laser		 In-House Automated roll feeding, sealed edge heat-sealing, digital length meter First-piece cutting inspection sheet, dimension signoff sheet Tolerance ±15 mm for manual cut; ±5 mm on automated CNC stations
Flexographic Printing
Up to 4 colors, 2 sides		 In-House Pantone approved swatch matching, water-based eco ink, tape rub test Printed proof swatch, ink adhesion tape pull test record Photorealistic CMYK halftones require pre-production film signoff
Sewing & Bag Assembly
Overlock, chainstitch, dustproof cord		 In-House Heavy-duty Union Special / Newlong heads, needle cooling, stitch density lock Seam strength test certificates, line inspection signoff Single / double / triple dustproof felt cord options fully supported
Finished Bag Testing
Top lift cyclic & burst validation		 In-House In-house hydraulic test frame per ISO 21898 standard (5:1 & 6:1) Top Lift load curve chart, burst test video & photo record Internal verification; external SGS/TÜV testing quoted upon request
PE / EVOH Form-Fit Liners
LDPE, barrier EVOH, conductive foil		 Specialist Partner Cleanroom partner audit, drop test, thickness gauge, seal burst test Liner manufacturer COA, food contact migration certificate Partner MOQ and lead time apply to specialized EVOH/conductive foil
Third-Party UN Certification
UN Dangerous Goods packaging		 External Lab National packaging testing center / accredited inspection bodies Official UN certificate & test report (drop, toppling, stacking test) Requires 3–4 weeks laboratory schedule; strictly per formulation

Strict Material Integrity

100% Virgin PP Polypropylene Policy.

QINFENG has a non-negotiable policy: we use only prime virgin polypropylene resin from accredited petrochemical leaders (Sinopec, PetroChina). Zero recycled scrap in structural load-bearing components.

Why Virgin PP Is Non-Negotiable

Recycled polypropylene degrades molecular chains during reheating, leading to unpredictable elongation, rapid UV degradation under sunlight, and catastrophic lifting loop failure under dynamic transport shocks.

  • MFI Stability: Controlled melt flow index ensures uniform yarn thickness without brittle thin spots.
  • UV Weathering: Virgin polymer absorbs UV stabilizers uniformly, preserving ≥50% tensile after 200h Xenon test.
  • Food & Chemical Grade: Free of hazardous heavy metals, plasticizers and post-consumer contaminations.

Complete 9-Step Batch Traceability Chain

Every single pallet or bale that leaves our loading dock maps back through our ERP to its exact production moment, machine operator, and raw resin railcar lot.

  1. 01 Spec Version & Drawing Confirmation
  2. 02 Approved Master Sample ID
  3. 03 Confirmed Printing Artwork Signoff
  4. 04 ERP Work Order & Raw PP Resin Lot
  5. 05 Extrusion & First-Piece Yarn Test
  6. 06 Weaving Roll & In-Process Inspection
  7. 07 Cutting, Sewing & Loop Pull Tests
  8. 08 Final Top-Lift & Visual Inspection
  9. 09 Container Pallet Number & Dispatch Archive

Empirical Validation

In-House Testing Rig vs. Third-Party Lab Scope.

We distinguish clearly between routine internal verification (cyclic top lift, fabric tensile, seam pull) and formal statutory certifications that require accredited third-party laboratories.

In-House Facility

Factory Laboratory & Hydraulic Test Rig

Immediate verification on every production batch before loading.

In-house hydraulic cyclic top lift test rig
  • Cyclic Top-Lift Testing (ISO 21898): Hydraulic rig verifies 5:1 (single-trip) and 6:1 (multi-trip) safety factor curves.
  • Universal Tensile Strength Tester: Tests breaking force and elongation for warp/weft tapes, fabric swatches and lifting loops.
  • Coating Adhesion & Peel Gauge: Ensures extrusion coating does not delaminate under heavy flex fatigue.
  • Conductive Resistance Meter: Grounding and surface resistivity checks for Type C and Type D electrostatic fabrics.
Accredited External Labs

Statutory Third-Party Certification (SGS / TÜV)

Formal international compliance testing for regulated industries.

Third party accredited packaging testing laboratory
  • UN Dangerous Goods Type Certification: Certified drop tests, toppling tests, righting tests and stacking tests by accredited national authorities.
  • Formal TÜV / LABORDATA ISO 21898 Reports: Independent third-party type approval certificates issued directly to the customer specification.
  • FDA / EU Food Contact Migration: Overall and specific migration limits verified via SGS/Intertek for food and pharma bulk applications.
  • Accelerated UV Xenon Weathering: Independent laboratory confirmation of ISO 21898 UV resistance (≥50% residual strength).

Honest Engineering

Clear Production Boundaries: What We Outsource.

A trustworthy partner tells you what they do best and where external specialists are brought in. We do not claim to manufacture items that belong to specialized chemical converters.

CORE IN-HOUSE FOCUS

Direct Industrial FIBC Manufacturing

Everything related to virgin PP flat yarn, circular/flat woven fabric, heavy lifting loops, coated/uncoated construction, precision stitching, dustproof assembly, and ISO 21898 cyclic load testing is managed 100% on-site in our Yantai facility.

  • ✓ Direct factory cost efficiency without trading intermediaries
  • ✓ Immediate engineering adjustments to GSM, loop drop, and seam build
  • ✓ Full control over batch scheduling, cut-off dates, and loading releases
TRANSPARENT EXTERNAL PROCUREMENT

Specialist Partner Components

To protect quality, we do not compromise by making specialized non-core items on generic machinery. These components are sourced strictly from audited, certified conversion partners:

  • ℹ️ Blown Film PE / LDPE Liners: Produced by dedicated class-cleanroom blown film converters.
  • ℹ️ High-Barrier EVOH & Foil Liners: Specialized oxygen/moisture barrier films with certified migration records.
  • ℹ️ Official UN / Statutory Type Testing: Conducted by accredited national and international inspection authorities.

Quality & Technical Verification

Ready to Review Our Quality Control Protocols?

See how each manufacturing stage is inspected from raw resin delivery to container loading, or send your bag specification for a detailed factory engineering review.

Request Technical Specs → View Quality Control