QINFENG Custom FIBC manufacturer since 2001
Agriculture & Feed Application brief
Bagging grain, seed and compound feed at an elevator or feed mill: high fill volumes, seasonal peaks, and a product that has to stay dry and free of mould until it is fed.
Grain elevators, feed mills, seed processors and agricultural traders, usually buying 500-1,000 kg bags because the product's bulk density is low. The buyer is typically a mill or logistics manager who cares about fill volume and bag stability on the pallet, not about bag weight.
Feed, Grain, Seed and other dry bulk solids, typically 0.8–1.6 t/m³.
Handling chain
Filling is usually through a spout at high rate, and the product may be warm when it is filled. Bags are lifted on four corner loops by forklift and stacked on pallets, often two or three high in a warehouse. Discharge is into a hopper, a mixer or a feed line.
Filled on automated spouts or semi-manual toll lines. High-speed de-aeration shapes the square footprint before the bag leaves the fill station.
Stacked two to three tiers high in transit warehouses. A baffle construction that does not bulge keeps the stack square instead of leaning into the aisle.
Lifted three to five separate times by port stevedores. Reinforced loop anchoring and cross-corner loops resist fork abrasion and tine punctures.
Has to fit inside the container wall, at roughly 2,350 mm internal width. A square footprint uses the cube without the bag dragging on the wall.
What fails in this chain
Moisture is the deciding risk for grain and feed: condensation inside a sealed liner on a warm fill, or a wet pallet underneath, turns a load into a rejected one quickly. Because grain and feed are light, the bag is usually filled to its volume limit before its weight limit, which makes the body bulge and the stack unstable - that is a stacking problem, not a strength problem. Leakage of fine feed at the seam is a loss and a housekeeping issue. Where the product is filled warm, ventilation can matter more than a liner.
Hazard: A standard tubular bag rounds out as it fills, wasting container volume and leaning in a warehouse stack.
QINFENG defense: Internal perforated ultrasonic baffles hold a square profile after fill, which is what makes three-high stacking in a shed predictable.
Hazard: Repeated lifting by rough tines tears side seams or frays loop attachment bases at transhipment hubs.
QINFENG defense: Heavier coated fabric with reinforced corner perimeter wraps and extra loop reinforcement backing, specified from the number of relifts.
Hazard: Faded printing or a torn document pouch causes customs delays and rejected cargo at the destination port.
QINFENG defense: Flexographic printing with UV-cured inks and a reinforced document pocket sewn onto the body seam, agreed before production.
Hazard: Unsheltered storage while awaiting vessel arrival degrades untreated polypropylene yarn within weeks.
QINFENG defense: UV-stabilised masterbatch in the tape, selected for how long the consignment actually waits on the quay rather than for the total storage period.
What we would quote
For a low-density product, a U-panel or baffle construction buys more stability per bag than a heavier fabric. Decide the liner on the fill temperature and the storage period, not on habit: a warm fill in a sealed liner can condense. Where the product must breathe, a ventilated construction is the alternative to a liner, and the two are not normally used together.
Before we can quote
Bag dimensions, baffle spacing and the safety margin all follow from these. Answer the ones you can and leave the rest; the missing details can be settled with our engineers.
Grain, seed or feed type, and the bulk density, which decides whether the bag fills by weight or by volume.
Whether the product is filled warm from a dryer, and the typical temperature at filling.
Indoor or outdoor, stacked how high, and for how long the bag has to hold the product in good condition.
The weight the mill actually fills, and the SWL to be marked.
Whether the product needs a moisture barrier or airflow, since the two lead to different constructions.
Hopper, mixer or manual tipping, and the spout size the plant needs.
This page covers dry grain, seed and compound feed. It does not cover liquid or high-moisture products, and it does not replace the customer's own fumigation, storage or quality regime. Any market-specific requirement is confirmed per project.
Talk to the applications team
We will come back with the construction we would build, the safety factor it carries and the dimensions that fit your loading plan — with drawings and a prototype before any bulk run.