QINFENG Custom FIBC manufacturer since 2001
Construction & Building Materials Application brief
Bagging cement and dry mortar at a batching plant or a dry-mix line: the bag has to survive a dusty, abrasive fill, hold 1,000-1,500 kg on a pallet, and keep moisture out until the bag is opened on site.
Dry-mix mortar producers, cement packing terminals, building-material distributors and their contract packers, typically running 25 kg valve bags for retail and 1,000-1,500 kg FIBCs for site delivery. The buyer is usually a plant or packaging manager, not a purchasing clerk.
Cement, Dry Mortar and other dry bulk solids, typically 0.8–1.6 t/m³.
Handling chain
Filling is usually through a spout at the packing head, with the bag hanging on a filling frame; the fill is fast and dusty. Lifting is by forklift or crane with four corner loops, and the filled bag often goes straight onto a pallet or into a curtain-sided trailer. Storage can be a covered yard for weeks. Discharge on site is normally by cutting the base or opening a discharge spout over a mixer.
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 first risk: cement sets hard, so an uncoated, unlined bag in a humid yard will ruin the load before it is used. Fine cement dust finds any weak seam, so seam quality and coating matter more than raw fabric strength. Abrasion at the filling spout and on rough pallets shortens bag life. Overload is usually a documentation risk rather than an engineering one - the SWL on the bag has to match the fill weight the plant actually runs. Outdoor storage for weeks makes UV stabilisation a real specification item, not a default.
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 site delivery on pallets where the bag must stay square and stack two high, a U-panel or baffle construction is the usual answer; a tubular bag is cheaper but bulges and stacks badly. For a dusty fill, choose a filling spout with a skirt and a coated fabric. If the customer stores in a humid yard, a loose or glued-in PE liner is worth more than a heavier fabric.
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.
The weight the plant actually fills, not the nominal bag size.
Determines the fill volume, and therefore whether the bag size on the line still works.
Packing head type, spout diameter and whether the bag hangs on a frame.
Covered warehouse, covered yard or open yard, and for how many weeks.
Loose PE liner, glued-in liner or none, and the gauge if already specified.
Colours, artwork file and the date the print-ready file must be approved.
This page covers bagging cement and factory-made dry mortar. It does not cover bulk tanker or silo delivery, and it does not set the customer's own storage rules. Requirements driven by a specific market regulation, or by a customer's own procurement standard, are 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.