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Equipment

Bottling lines and fillers, small and large

What does it take to bottle cider, at home and at scale?

In short

At kitchen scale a bottling line is a vessel with a tap, a length of food-grade tubing, a bottling wand that shuts off when lifted, and a capper. At commercial scale it is a rinser, a filler, a closure applicator, a labeller and a packer, all synchronised.

The two things that determine whether the bottling was good are how much oxygen the cider picked up and, for a carbonated product, how much carbon dioxide it lost.

A still cider can be filled by gravity. A carbonated one cannot, because dropping the pressure makes it foam; it needs a counter-pressure filler that pressurises the bottle before the cider goes in.

Filler types

The counter-pressure principle is worth understanding because it explains why carbonated cider cannot simply be poured. Dissolved carbon dioxide stays in solution only under pressure; the moment cider meets atmospheric pressure it starts breaking out, foaming and losing gas. A counter-pressure filler removes the pressure difference entirely: the bottle is first flushed with carbon dioxide to displace air, then brought up to the same pressure as the supply tank, and only then is the liquid valve opened, so the cider transfers without ever seeing a pressure drop.

How cider is put into a bottle
FillerHow it worksSuitsOxygen pickup
Bottling wand on a siphon or tapA spring valve at the tip opens when pressed on the bottle base and closes when liftedStill cider at small scaleModerate; the bottle is full of air to begin with
Gravity or level fillerCider falls from a bowl into the bottle to a set level, air displaced through a vent tubeStill cider at small and medium scaleModerate
Vacuum fillerAir is drawn from the bottle and cider followsStill cider, medium scaleLower than gravity
Counter-pressure or isobaric fillerBottle is purged and pressurised with CO₂ to the cider’s own pressure, then cider flows in with no pressure dropCarbonated cider at any scaleLow when the purge is done properly

Oxygen at the filler

Total package oxygen is the sum of what is dissolved in the cider, what is in the headspace when the closure goes on, and what enters through the closure over the product’s life. The filler controls the first two, and at bottling the headspace is usually the larger contribution — an air-filled headspace of a few millilitres is a substantial dose of oxygen relative to what a finished cider can absorb without changing.

The countermeasures are all about displacing that air: purging the empty bottle with carbon dioxide, filling from the bottom so the incoming cider pushes air up and out rather than mixing with it, and either jetting the headspace with gas or provoking a small foam that fills the neck immediately before the closure lands. On a bottle-conditioned cider the yeast will scavenge some residual oxygen, which is one of the quieter arguments for that method.

At small scale the same principles apply in cruder form. Filling to the top and letting the wand’s withdrawal set the fill level leaves a small, consistent headspace; splashing the cider into an open bottle from a height does not. Bottling on a day when a batch is not ready, because the bottles are washed and the afternoon is free, is a common way to lose a cider.

A small-scale line, in order

What a commercial line adds

A commercial line adds synchronisation and monitoring rather than a different principle. A rinser inverts and rinses each bottle immediately before filling; the filler is a rotating carousel of valves; a capper or corker follows within a second or two; and the line is instrumented so that fill level, torque or crimp, and often dissolved oxygen are checked continuously rather than at the end.

It also adds a great deal of cleaning. Every filler valve, every seal and every product path in the carousel is a place cider sits, and the clean-in-place regime on a filler is more demanding than on a tank because the geometry is worse. A filler is the last thing the cider touches, so a contaminated filler contaminates everything and nothing downstream can fix it.

Pasteurisation, where it is used, sits either before filling as a flash pasteuriser or after it as a tunnel pasteuriser through which sealed bottles pass. Which one is chosen changes the whole line layout, because a flash-pasteurised product must be filled aseptically to stay stable, while a tunnel-pasteurised one can be filled ordinarily.

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