Container Liner for Dry Bulk — PP Woven and PE Film

A container liner is a single large bag fabricated to the inside of a standard 20 or 40 foot shipping container, so dry bulk cargo travels loose instead of in sacks. It hangs from the container’s own lashing rings, is filled through top spouts or a door-end opening, and carries a woven bulkhead with steel bar pockets that holds the load when the doors are opened. GI PackTech makes them in laminated woven PP, breathable unlaminated fabric and welded PE film.

It depends entirely on whether the cargo breathes. A laminated liner is effectively airtight, which is right for petrochemicals, malt and moisture-sensitive chemicals. An unlaminated woven liner lets air through the weave, which is what grain, rice, coffee, seeds and any cargo loaded warm actually need — seal a respiring product into a non-breathable liner and the moisture it gives off has nowhere to go but back onto the cargo.

The saving comes from three places at once: the sacks and pallets are removed, the filling and emptying labour at both ends largely disappears, and around 20 per cent more product fits into the same 20 foot container because nothing is being shipped as air between bags. The container also needs no cleaning before loading or after discharge — the liner is simply removed with the cargo residue in it.

Free-flowing dry solids: petrochemical granules and resins, PVC and polymer powders, soda ash, fly ash, urea and fertilisers, malt, wheat, rice, sugar, coffee, oilseeds, pulses, minerals and ores. The cargo decides the construction rather than the other way round, and food grade and antistatic constructions are made where the product or the area classification requires one.

Two people fit it using the steel bars supplied, with no other equipment and no modification to the container. Loading is through top filling spouts, a front loading opening, or both, positioned to suit your filling head. Discharge is by gravity, by tilting the container on a tipping chassis, or through a bottom spout — which one you use is agreed before the liner is made, because it changes the construction.

GI PackTech manufactures dry bulk container liners at Gundlav, Valsad, in Gujarat, and has been making industrial flexible packaging there since 2006. The plant is ISO 9001:2015 certified, runs its own lamination, extrusion, cutting and heat-sealing lines, and supplies across India and for export. All three constructions — laminated woven, unlaminated woven and welded PE film — are made in-house, so the recommendation is not steered by what happens to be on the machine.