The packaging stage is the final process in beer production and the most complex, with the greatest impact on product quality. It affects not only the beer’s internal quality but also its visual appeal. In today’s increasingly competitive market, packaging is no longer just a container—it is one of the most direct ways a product communicates with consumers. Only by getting both quality and appearance right can a product truly earn market recognition.
Currently, about 80% of beer is bottled in glass bottles or cans. Before filling, bottle washing is a critical step.
Purpose and Requirements of Bottle Washing
The core purpose of bottle washing is to thoroughly clean the inside and outside of empty bottles, followed by disinfection and sterilization, providing bottles that meet hygiene standards and are ready for filling. Specific requirements include: clean and shiny inside and outside surfaces, no off-odors, no damage; moderate bottle temperature, generally around 30°C; neutral pH value of 7; minimal residual liquid inside, typically 3–4 drops; compliance with microbiological standards, with no coliform bacteria and a total bacterial colony count not exceeding 2.
Basic Principles of Bottle Washing
The cleanliness level of beer bottles has a decisive impact on beer shelf life. Modern washing processes require that no visible stains remain on the inside or outside surfaces. In large-scale production, cleanliness is typically inspected by an empty bottle inspector—because on high-speed filling lines, manual visual inspection is simply not feasible.
In day-to-day operations, bottle cleanliness can be assessed visually: if the bottle wall is completely covered by an even water film, cleaning has been thorough. If cleaning is insufficient, water droplets will form on the glass surface due to incomplete wetting.
Two Key Processes in Bottle Washing
- Mechanical cleaning
- Elimination and inactivation of microorganisms harmful to beer
The hygiene level of cleaned bottles is verified through microbiological testing, and all microorganisms in the bottles must be thoroughly eliminated.
Factors Affecting Cleaning Effectiveness
Soaking
The separation and removal of contaminants from bottle surfaces require adequate soaking time, generally 8–10 minutes. Soaking time also directly affects the effectiveness of label removal.
Spraying (Mechanical Action)
The spraying and cleaning section is typically located in the upper part of the bottle washer. Modern bottle washers generally feature combined soaking tanks followed by spray cleaning stations to further enhance cleaning effectiveness through mechanical force.
Temperature
Higher cleaning temperatures accelerate the dissolution and removal of contaminants. The effective treatment temperature is typically between 70–85°C, a range that also achieves the desired hygiene standards.
Cleaning Agent
Cleaning agents are typically alkaline, especially when used at high temperatures, providing both soil removal and sterilization. They act as both the medium for removing contaminants and the carrier for suspended soils.
Effect of Cleaning Agent Temperature and Concentration
Cleaning effectiveness is directly related to the temperature and concentration of the cleaning agent. The higher the temperature, the lower the concentration required. Generally speaking, increasing the cleaning agent concentration by 50% at the same temperature, or raising the temperature by 5.5°C at the same concentration, yields comparable cleaning results.
From bottle washing to filling, the stable operation of the entire packaging system relies on the precise coordination of each process step and the reliability of the equipment. Parameters such as washing temperature, spray pressure, and cleaning agent concentration may seem like standard operating procedures, but in practice, even minor deviations can affect the quality of an entire batch. With years of experience in the brewing equipment industry, our team is dedicated and technically proficient, ensuring attention to these easily overlooked details and helping our customers avoid unnecessary challenges.
Our company is located in the birthplace of China’s brewing equipment industry, surrounded by a complete industrial supply chain ecosystem. This means that from main equipment to peripheral components, customers benefit from convenient maintenance and upgrades, as well as responsive after-sales support. Our products offer high cost-performance—not simply by competing on price, but by providing a system that operates reliably over the long term, backed by support you can count on at a reasonable investment.
In brewing technology, we have long been at the forefront in China. Many customers choose us not just for the equipment itself, but for the process support and team reliability behind it. From bottle washing to filling, from process parameters to operational details, we deliver not only equipment but also the peace of mind that comes from knowing your system is built to perform.
