Putting a 220L aseptic bag into a steel or fiber drum looks like a simple "drop it in" job — but how it is placed decides three things: how much liquid you can actually fill, whether the bag will leak, and whether the aseptic condition survives. This guide covers the 6 placement steps, 5 common mistakes, and how to match drums and fitments.

1. Why placement deserves its own guide

220L (55 gallon aseptic bag in drum liner) is mainly used for raw material transfer: juice, tomato paste, birch sap and edible oil moving between plants or from plant to filling line. Three characteristics define this stage: one bag holds several hundred kilograms, so how the bag is stressed and how well it hugs the drum wall decides whether it survives transport vibration; a single leak is measured in tons, plus cleanup cost and downtime; the aseptic condition is a one-time opportunity — an improper filling operation cannot be corrected later in the filling room.

A typical case we have seen: the bag was not fully unfolded inside the drum, its bottom stayed bunched together, so during filling the bag bottom could not descend with the liquid level and the fill volume never came up. The bag's capacity was fine — the placement was not. It looks like a small thing, but on a several-hundred-kilogram bag the cost is not small.

2. Three things to confirm before you start

Drum. Steel drums, fiber drums and plastic drums all work, but check the interior: burrs, weld spots, label adhesive residue and bottom protrusions will rub the bag repeatedly in transit and are a main source of pinholing. Keep the drum dry, clean and odor-free.

Fitment. The bag fitment (valve / discharge port) must match the customer's filling gun, pump hose and extraction method. Common market sizes are 1", 2" and 3" — different filling equipment uses different ones, so confirm before filling day, not on site.

Bag vs. volume. A 220L bag corresponds to the 200L–220L drum class; bag size must match the drum volume and opening diameter, otherwise you get either "bag can't reach the wall" or "bag flange cannot be held down".

3. The 6 placement steps

1. Clean the drum: no burrs, no residue, dry.
2. Unfold the bag outside the drum, then lower it in bottom-first and spread the body along the wall.
3. Let the bag sit against the drum wall naturally — no forcing, no suspended folds.
4. Position and fix the fitment so later hose connection will not pull on the bag.
5. Fill and let it descend: the bag bottom must descend step by step with the liquid level — this is the single most important rhythm for fill volume and stress control. If the bottom does not descend, the bag never fills.
6. Seal and check: seal after filling (inner PE heat seal), check for trapped folds and stressed fitments, then secure the load for transport.

4. Five common mistakes

1. Filling before the bag is fully unfolded → bunched bottom, short fill, concentrated stress.
2. Skipping the drum interior check → burrs and welds rub the bag, pinhole leaks in transit.
3. Not confirming the fitment in advance → cannot connect on site, or the hose pulls the bag.
4. Bag size mismatched to drum → bag shifts, or the flange leaks.
5. Assuming "the bag is aseptic, so placement doesn't matter" → improper handling breaks sterility with no later remedy.

5. Film structure decides shelf life

Standard PA/PE+PE is medium barrier for short turnover cycles. PE/VMPET/PE+PE is high barrier (OTR<1) for oxygen-sensitive liquids such as NFC juice and birch sap, holding freshness for 12 months or more. Our constbarrier aseptic bag is ultra-high barrier (OTR<0.3) for highly oxidation-sensitive juice and longer shelf-life requirements.

Large-format bags can add one more PE layer to boost physical performance (drop and puncture resistance) — the bigger the bag, the more this matters. In metallized and foil structures the aluminium layer also blocks light, which for light-sensitive liquids such as birch sap and wine is part of preservation.

FAQ

Is 220L the same as 55 gallon?
Yes — 55 gallon ≈ 208L, and the industry generally uses it for the 200L–220L class of aseptic drum liners.

Can we use plastic drums?
Yes. Steel, fiber and plastic drums are all in use; the choice depends on transport method and load requirements, but interior condition and bag size matching are what matter.

How do we verify the bag is strong enough?
Impact resistance has standard test methods (e.g. free-falling dart method GB/T 9639.1-2008, with specimens conditioned per GB/T 2918 for at least 40 hours). Ask suppliers for the test evidence rather than judging by thickness alone.

Does correct placement guarantee no leakage?
No absolute guarantee exists. The bag is flexible; stacking, sharp edges and very long-distance vibration all carry risk. What we do is control what can be controlled — drum interior, unfolding, filling rhythm, fitment stress — and let the film structure and testing carry the rest.

About QC Packaging: With more than two decades in liquid flexible packaging (founded 2001), QC Packaging runs its own factory in Wuxi, is ISO 22000 certified and operates a Class 100,000 cleanroom. Products meet GB 4806 series, EU 10/2011 and FDA 21 CFR food-contact requirements. From collection bags, aseptic bags and bag-in-box / drum liners to fitments and filling support, we deliver a complete path from bag to running production line.

Want to talk about your drum? If you are handling bulk raw material transfer, tell us your drum type, filling method and liquid characteristics — we will define the bag format, fitment and film structure together, then arrange samples. From sample to mass production, we run the line with you.