Beer Bottling Equipment: Questions for Line Suppliers

Poor oxygen control can damage beer quality, while an incompatible crown or bottle can leave a bad seal. Compare the filling and crowning sequence against your beer, pressure-rated bottle and measured oxygen targets before comparing output.

Use this guide to allocate process checks, then copy or print the process evidence record. For the broader comparison, see glass bottle filling machines.

The bottling process of beer, step by step

The Brewer’s Handbook, in its chapter on bottling beer, lists the bottle-filling operation as depalletizing, decrating, bottle rinsing or washing, filling, crowning, labeling and case packing, and says oxygen pickup must be kept to a minimum throughout. With the steps around the filler that this guide covers, a commercial flow for non-returnable glass usually runs as below. Order and equipment vary by line and supplier, so use the list to check that every step has an owner in each proposal, not as a fixed layout. Homebrew bottling kits and hand bottling follow a different, manual process and are outside this guide.

1. Prepare the bright beer. Carbonation, filtration and any chemical or cold stabilization happen upstream in the cellar. Check dissolved oxygen and temperature at the bright tank before bottling; the handbook notes that foaming becomes a problem when warmer beer is filled.
2. Sanitize the line. The handbook calls the bottling line the last opportunity to control beer spoilage organisms and says sanitation should be done immediately before each production batch and after extended shutdowns.
3. Depalletize and feed bottles. Empty glass is unloaded and spaced onto the conveyor; depalletizers and infeed covers this stage.
4. Rinse. Non-returnable bottles are inverted and sprayed. The handbook explains that “case dust” particles in new bottles act as nucleation sites and cause foaming during filling. Returnable bottles need a washer instead.
5. Evacuate, purge and fill under counter-pressure. Air is removed, the bottle is pressurized to the filler bowl pressure, and beer flows in by gravity so carbonation stays in solution. The table further down lists what to ask about each part.
6. Remove headspace air. Fobbing or jetting foams the beer so the foam pushes air out just before the crown goes on.
7. Crown. The crown seals the bottle and is part of the oxygen system (see the crowns section).
8. Stabilize, if the beer is pasteurized in the bottle. A tunnel pasteurizer treats sealed bottles after crowning. Flash pasteurization and sterile filtration happen before filling instead, so they add no step here.
9. Rinse, dry and label. The handbook lists post-bottle rinsing and drying before labeling; wet bottles affect label application.
10. Inspect. Fill level, crown presence and position, and label checks remove faulty packages.
11. Case pack, seal and palletize. Finished bottles are packed for warehousing and shipment.

The handbook also separates semi-automated lines, where workers move bottles between separate machines, from fully automated lines, and describes monoblocks that mount several machines on one chassis. Ask each supplier which of the eleven steps its proposal covers, which are combined in one machine, and which are left to you or another vendor.

Define the product and package first

A supplier cannot judge oxygen control or stabilization without knowing what is going into the bottle. Prepare these inputs before asking for a quote.

• Beer styles and carbonation range, including any hop-forward or heavily dry-hopped beers and whether any bottle-conditioned product is planned.
• Bottle shapes, finish and glass strength. The crown finish and bottle pressure rating matter for crowning and pasteurization, so use the bottle specification checklist and read bottle neck finishes and closure compatibility.
• Target output and the number of formats, including future bottle changes (bottling-line changeovers lists what to check when a new bottle arrives).
• Incoming beer quality: dissolved oxygen, temperature, carbonation and clarity at the filler.
• Shelf-life target and storage conditions.

Where oxygen enters a bottle

Brewing literature separates dissolved oxygen (DO) in the beer from headspace oxygen, and combines them as total package oxygen (TPO). In the Craft Brewers Conference case study from Pelican Brewing, DO is the oxygen dissolved in the beer in parts per billion, and TPO is a calculated value that accounts for DO and standardizes it across package sizes using temperature, liquid volume and headspace volume. A workshop from the American Society of Brewing Chemists adds that bottles are harder to evacuate and generally pick up more dissolved oxygen than cans, which pick up more headspace oxygen.

Oxygen also comes from the closure and the line. The same workshop lists crowns and closures, vacuum evacuation (including minimizing residual rinse water), jetting, the crowner and filler speed as bottle-filling factors. The Pelican case study found that worn seals, button valves and similar parts were frequent sources of DO pickup on an older line, and that maintenance of internal seals mattered. That is one brewery’s experience, but it supports asking suppliers about wear parts and service intervals.

How oxygen is measured matters more than a claimed number. The Pelican study reports that packaged-air tests and DO/TPO results showed very little correlation on its rebuilt line, with DO/TPO a more sensitive test. It also used its own targets, aiming for a TPO of 100 ppb or lower and treating 500 ppb as a minimum standard; those are one brewery’s targets, not an industry specification. Ask suppliers which method will prove oxygen performance, who performs it and under which conditions.

How long will bottled beer stay fresh?

There is no shelf-life number that selects a line for every beer. The cited brewery case study relates shelf life to oxygen and storage conditions on its own products. Define the brewery’s shelf-life target, distribution conditions and measurement plan, then verify the finished package.

How the filling sequence controls oxygen

Most bottle fillers combine several steps. The table shows what each is for and what to ask.

The Pelican study notes that even after two vacuums slight residual atmosphere remains, and CO2 pre-sparging helps reduce oxygen accumulation in the filler bowl headspace. It also describes continuously flushing the bowl headspace with CO2: without it, raw DO rose by about 100 ppb over a five-hour packaging run on that machine. Treat the number as that brewery’s observation, not a general rule, but ask whether the filler design addresses bowl headspace oxygen over a long run. The ASBC workshop lists jetting among the bottle-filling factors to manage. The purpose column in the table is an editorial summary of common practice, so ask each supplier to describe its own implementation.

Because bottles are harder to evacuate, look at pre-evacuation and fill-valve design before comparing rated speeds.

Crowns and closure choices

The crown is part of the oxygen system. Crown Holdings describes oxygen-scavenger and oxygen-barrier crowns, easy-open crowns, and a range of twist-off and pry-off crowns with different metal weights and liner profiles, selected for removal torque and pressure retention. The ASBC workshop notes that crown liner materials can scalp beer flavors or contribute off-flavors, and that the oils and waxes used to reduce twist-off torque can contribute contaminants.

Ask the supplier which crowns and crown finishes the crowner has been set up for, how crowning pressure and height are controlled, and how crowns are fed and protected. If your project includes jars or other closures on the same line, the capping equipment guide compares closure application methods. Confirm that the crown and crowner suppliers agree on the crown specification.

Pasteurization vs. other stabilization

Stabilization is a product decision before it is an equipment decision. Have the brewery process lead define the treatment, its position relative to filling and the verification method. Record who sets the product-specific target; a machine proposal alone does not establish it.

These questions follow.

• Is stabilization needed for your distribution distance and shelf-life target, or will sterile filtration and clean filling be enough?
• If a tunnel pasteurizer is included, how are bottle thermal conditions managed, who sets the PU target, and how is it verified in the package?
• If flash pasteurization or filtration is used, what keeps the filler and bottle clean afterward, since the heat treatment does not cover contamination picked up downstream?
• How do pressure, headspace and crown choice interact with the heat treatment?

Fill-level and crown inspection

Heuft describes the checks performed in the outfeed area of the filler block as fill level, closure presence and, if necessary, closure position, residual air (especially for beer) and tightness. It lists photocell, X-ray or gamma absorption, and high-frequency measurement for fill level, and says modern devices can report how often a given filler valve produces an underfilled container. That statistics feature can inform maintenance, so ask for it. The same 2002 report describes licensing and trained-staff obligations for the X-ray and gamma methods; confirm the current local requirements.

Foam is the complication for beer. Ask how inspection sensitivity is set when foam is present just after the crowner, what faults are rejected (low fill, missing crown, high or cocked crown, residual air), and how rejected bottles are removed. The scope of what each system checks and where it can miss defects is covered in bottle inspection systems. Also decide whether a second closure inspection should be placed later in the line, for example after labeling or pasteurization.

After the crowner

Bottles then move to labeling and packing. Wet bottles from a tunnel or condensation affect labeling, so check the conditions the labeler is rated for. For cases and pallets, see case packing and palletizing for glass bottles. To see how the filler, crowner, pasteurizer and inspection fit with the rest of the plant, use planning a glass bottling line.

Questions to send suppliers

Copy or print this working record for each proposal; these are evidence requests, not answered FAQs. Fill in the named owner and attach the supplier’s response or trial reference.

Use the bottling equipment RFQ checklist to compare the completed records.

Evidence and limitations

This is editorial analysis of public technical material, not a hands-on evaluation of any machine. Oxygen performance, foaming and stabilization depend on the beer, bottle, filler configuration, maintenance and measurement method, and the brewery case studies describe specific lines. Numeric targets in the literature are one brewery’s practice, not standards, and equipment suppliers’ claims should be treated as claims until demonstrated.

• Chapter 17: Bottling Beer, The Brewer’s Handbook (Apex Publishers), with its sections on pre-bottling operations, bottle pre-rinsing, bottle filling and bottling lines: sequence of bottling operations, line sanitation, case dust and foaming, counter-pressure filling and line automation levels. Accessed October 8, 2026.
• Teaching an Old Bottling Line How Not to Suck (Air), Craft Brewers Conference (Brewers Association), Pelican Brewing presentation: DO versus TPO, targets, pre-evacuation, CO2 purge and valve seal maintenance on one bottling line. Accessed October 8, 2026.
• The Science Behind Packaging Quality, American Society of Brewing Chemists workshop slides: crown liner effects, bottle versus can oxygen characteristics and TPO troubleshooting. Accessed October 8, 2026.
• Caps and Other Offerings, Crown Holdings: describes oxygen-scavenger crowns and twist-off and pry-off crown variants. Accessed October 8, 2026.
• Inspection systems in the filling plant, Heuft, translation of a June 2002 trade report: historical description of fill-level, closure and residual-air checks; local current obligations require confirmation. Accessed October 8, 2026.