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Moisture-barrier free volume | Large-format conversion

Barrier 3D Bags and Large Foil Machinery Bags

Custom barrier film bags and covers sized to your free volume when plain PE is not enough moisture resistance. Large-format conversion for machinery and export packing, with method detail linked from the barrier packing system pages. Film thickness 25 to 300 microns where the construction allows.

Barrier packing method →
25 to 300 micronsBarrier film formatsCustom L x W x HWorks with desiccant plans

What barrier 3D bags are for

A barrier 3D bag is a form-fit bag or cover made from barrier film so free volume has a higher moisture and gas barrier wall than standard PE. Large-format barrier bags are commonly used as machinery covers, crate liners and free-volume enclosures. This page covers BENZ large-format conversion, sizing and enquiry, with method detail linked from the barrier packing page.

System method: vacuum and aluminium barrier packing. Enclosed corrosion protection: VCI 3D bags. General PE geometry: custom 3D bags.

Barrier pack performance depends on laminate grade, seal quality and packing method. For system method, vacuum practice and aluminium barrier packing detail, use the linked barrier packing page. This conversion page is not a full WVTR/OTR datasheet.

When barrier free volume is the right call

SituationWhy barrier format
Long ocean free volumeLower moisture ingress than PE alone
Humidity-sensitive equipmentSealed free volume wall
Export machinery bagLarge custom geometry
Metal plus moisture riskBarrier wall, possibly stacked with VCI

Manufacturing parameters

ParameterWhat BENZ supplies
Film thickness25 to 300 microns where the construction allows
Film familyBarrier film for enhanced moisture-barrier protection in a sealed pack
GeometryCustom 3D bags and large-format covers
SizeCustom dimensions; no fixed catalogue-size limit

How to measure

Measure maximum packed L, W and H including protrusions. State whether the pack will be heat sealed, vacuum assisted or closed another way. Barrier performance depends on film and on how well free volume is actually closed. If wooden structure is part of the export pack, keep flexible barrier conversation here and structural method on export packing and crating pages.

Where barrier bag projects fail: using barrier film with a half-open seal; skipping desiccant on long ocean free volume when the method needs it; ordering VCI language when moisture barrier wall was the real risk; measuring without the skid. Measure, close free volume, then stack methods honestly.

Enquiry checklist

DetailWhy it matters
Maximum packed L x W x HPacked free-volume envelope
ProductMachine, assembly, spare set, other
LaneExport weeks, storage, climate notes
Closure methodHeat seal, vacuum assist, other
Desiccant planYes, no, or calculate later

Common questions

What is a barrier 3D bag?

A large-format three-dimensional bag or cover made from barrier film so moisture and oxygen ingress into free volume is reduced compared with plain PE. Often used as foil machinery bags and large barrier covers.

How is this different from a VCI 3D bag?

Barrier film targets moisture and gas barrier performance of the package wall. VCI film targets vapour-phase corrosion chemistry inside free volume. Jobs often stack, but they are not the same product or the same primary risk.

Is this the full barrier packing method page?

No. System method, vacuum practice and aluminium barrier packing detail live on the vacuum aluminium barrier packing page. This page is large-format conversion and enquiry geometry.

What film thickness can you supply?

BENZ can supply film constructions from 25 to 300 microns where the construction allows; barrier laminates are selected for the sealed-pack risk and free-volume size.

Do barrier bags replace desiccant?

Not automatically. Many export packs combine barrier free volume with calculated desiccant. Container climate is a separate product family from the bag itself.

What should I send for a quote?

Maximum packed L x W x H, product type, export weeks or storage, whether vacuum or heat seal is planned, desiccant plan if known, quantity and photo.

Need a barrier bag for real free volume?

Send your dimensions and export or storage context. We will quote a barrier 3D format and link the packing method steps.

VCI 3D bags →
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