Bottling line

Lore & Background

The bottling process for beer begins with depalletising, where empty bottles are removed from their original pallet packaging. Bottles may then be rinsed with filtered water or air, and carbon dioxide may be injected to reduce oxygen levels. The bottle enters a filler, which fills it with beer and may inject inert gas (carbon dioxide or nitrogen) on top to disperse oxygen, as oxygen can ruin product quality via oxidation. The bottle then goes through a capper, which applies a bottle cap; a few beers are bottled with a cork and cage. After capping, a labelling machine applies a label, and a lot number (often the date and time of bottling) may be printed for traceability. The product is then packed into boxes and warehoused.

The wine bottling process is largely similar, except wine bottles differ in volumes and shapes. Traditionally, a cork is used for closure. After filling, a bottle travels to a corking machine where a cork is compressed and pushed into the neck, while the corker vacuums air out to form a negative pressure headspace, removing oxygen and counteracting pressure from thermal expansion. Champagnes and sparkling wines may be sealed with a muselet to prevent the cork from exploding off in transit. Alternative wine closures such as screw caps are available. Some bottling lines incorporate a fill height detector to reject under- or over-filled bottles, and a metal detector. After filling and corking, a plastic or tin capsule is applied to the neck in a capsular, then a label is applied, and the product is packed into boxes and warehoused.

Reader's Guide

Bottling lines are significant because they enable large-scale packaging of beverages and prepared foods, ensuring efficiency and consistency. The article describes various filling machine types—liquid level, volumetric, overflow pressure, and gravity—each suited to different production scales and cost considerations. Overflow pressure fillers are noted as most popular among beverage makers, while gravity filling machines are most cost effective. Inline filling machines are most popular for automation, but rotary machines are much faster and more expensive. Quality assurance is integrated through fill height detectors, metal detectors, and date stamps for traceability. The process also addresses product preservation: for beer, inert gas injection and oxygen reduction are critical to prevent oxidation; for wine, vacuum corking creates a negative pressure headspace to remove oxygen and counteract thermal expansion. The legacy of bottling lines lies in their adaptability to different products (beer, wine, sauces, oils) and their role in maintaining product quality from filling to warehousing.

Did You Know?

• Many smaller breweries send their bulk beer to large facilities for contract bottling, though some will bottle by hand.
• Virtually all beer bottles are glass.
• Champagnes and sparkling wines may be sealed with a muselet to ensure the cork will not explode off in transit.