Stop struggling with standard bulk bag failures. From bulk density calculation and fabric grammage (140–220 GSM) to food-grade liners and UN dangerous goods compliance, QINFENG engineers every bag directly to your material handling workflow.
No generic inventory compromises. Every batch is manufactured from raw virgin PP to your exact technical specifications.
We calculate bag weight based on material density and SWL so you never pay for excess plastic or risk line tears.
Fast trial samples sent via FedEx/UPS (1–2 pcs free for standard dimensions) for testing directly on your hoppers.
Direct in-house woven virgin PP in standard colors or fully custom masterbatch colorways for private label branding.
Avoid expensive packing line jams, sift leaks, and structural deformation with our systematic 4-step engineering protocol.
We analyze your product's bulk density (kg/m³ or lb/ft³), moisture sensitivity, flowability (angle of repose), and particle sharpness to determine correct cubic volume and fabric coating requirements.
Whether you require 500 kg, 1000 kg, 1500 kg, or 2000 kg SWL, we calculate required fabric tensile strength and select certified 5:1 (single-trip) or 6:1 (multi-trip) construction compliant with ISO 21898.
We match spouts, duffle tops, or full-open skirts to your filling chute diameters. Discharge spouts with petal or star closures and cross-corner loops ensure safe forklift crane engagement.
We deliver 1–2 test bags to your plant within 7–10 days. Once your operators approve the fill, lift, and discharge cycle, we lock the exact virgin PP formula and bag grammage for mass consistency.
Every element of the bag can be tailored to match your filling machines, warehouse racking, shipping containers, and customer branding.
Choose from standard U-Panel, 4-Panel, Circular/Tubular fabric, or Form-Stable Baffle (Q-Bag) designs that prevent rounded bulging and save up to 25% pallet space in sea containers.
In-house extrusion coating lines provide breathable uncoated woven fabric or 15–35 GSM PE/PP lamination to block external humidity and prevent fine powder leakage.
Engineered to match automatic hopper chutes or manual overhead filling stations with custom tie cords and dust flaps to guarantee clean plant operations.
Controlled emptying without dangerous bursts. Features iris closures, daisy chain protection, or full dump bottoms for fast discharge of construction aggregates.
Custom woven heavy-duty polypropylene webbing available in varied loop free heights (25–40 cm) with protective wear sleeves for rough forklift tines.
Essential for ultra-fine powders (flour, starch, carbon black, chemicals). Multi-needle chain stitching with thick polypropylene felt cords seals all needle punctures.
Protect hygroscopic or chemically sensitive powders with custom virgin polyethylene, EVOH, or aluminum foil barrier liners inserted loosely, tabbed, or glued.
Prevent explosive combustible dust hazards with certified Type B, Type C (groundable grid with copper tabs), or Type D dissipative bags, and full UN II/III certification.
Elevate distributor and private label sales. We provide up to 4-color flexographic printing, clear hazard diamond warnings, document pouches, and retail barcode labeling.
Maximize shipping cube efficiency and warehouse automation. Compressed hydraulic bales (50–200 pcs) or stretch-wrapped fumigated wooden pallets tailored to your dock.
Every custom FIBC project begins with an exact technical worksheet. We establish load weights, dimensional margins, and UV ratings before our spinning looms run a single meter.
Certified factory limits for industrial and food grade exports
| Safe Working Load (SWL) | 500 kg to 2,000 kg (custom ratings available upon review) |
|---|---|
| Safety Factors (SF) | 5:1 (Single trip) | 6:1 (Multi-trip reusable) |
| Base Dimensions | 85×85 cm, 90×90 cm, 95×95 cm, 100×100 cm, 105×105 cm (or fully custom) |
| Cut Height | From 70 cm up to 240 cm (adapted to product density) |
| Fabric Weight | 140 GSM, 160 GSM, 180 GSM, 200 GSM, 220 GSM |
| Coating / Lamination | Uncoated breathable or 15–35 GSM PE/PP coating |
| Stock Fabric Colors | White, Black, Green, Blue (custom colors on MOQ) |
| Minimum Order Quantity | 500 – 1,000 pcs (trial sample 1–2 pcs supported) |
From high-purity food starch to abrasive sharp mineral ores, see how custom features solve specific line hazards.
Moisture-barrier coated fabric with sift-proof seams and optional anti-static grounding tabs. Eliminates static discharge risks and humidity clumping.
Key: Sift-Proof Seams + Coated FabricCleanroom produced with virgin 100% FDA/EU compliant food-contact resin. Clean ultrasonic cutting prevents loose stray threads from entering food ingredients.
Key: Virgin Resin + Ultrasonic Clean CuttingHeavyweight 200–220 GSM woven fabric with reinforced perimeter stevedore straps for 1500–2000 kg heavy ore and bulk rock salt handling.
Key: 220 GSM + Cross-Corner Stevedore LoopsSpecial air-permeable fabric with vertical breathing stripes allows constant air circulation, preventing mold formation in potatoes, onions, and firewood.
Key: Airflow Slits + 1000kg SWLWe primarily need: 1) Material name and bulk density, 2) Target Safe Working Load (SWL), 3) Bag dimensions or volume, 4) Top and bottom filling/discharge style, and 5) Estimated order quantity and destination port. If you already have a technical spec sheet, you can email it directly.
Yes, absolutely. For standard dimension bags we provide 1–2 free trial samples within 7–10 days; you only cover the courier shipping (FedEx/UPS). For complex custom molds or non-standard dyed fabrics, a small sampling fee applies.
Our typical MOQ is 500 to 1,000 pcs when using our in-stock virgin fabric colors (White, Black, Green, Blue). For completely custom fabric colors or unique specialized liners, MOQ may range from 1,000 to 2,000 pcs.
We lock the exact bag weight (grammage) and raw material batch formula. Because PP resin accounts for approximately 60% of manufacturing cost, untrustworthy suppliers cut weight to save money. At QINFENG, we contractually guarantee GSM tolerances.
Yes. OEM brand printing is our routine operation. We can print your company logo in up to 4 colors, insert customized transparent document pouches, and apply individual retail barcodes and price tags for retail/supermarket distribution.
We support FOB Yantai / Qingdao, CIF, and complete door-to-door DDP shipping (duties paid) directly to warehouse facilities in North America, Europe, Australia, and worldwide.
Tell us what bulk material you are packing and your filling requirements. Our technical sales engineers will calculate your bag weight, recommend optimal fabric GSM, and quote factory-direct pricing within 24 hours.