Types of Beverage Filling Machines and Their Suitable Applications

Introduction

In a beverage or liquid packaging production line, the filling machine is one of the most important components that consistently dispenses a precise quantity of liquid in the container. These machines can handle a wide variety of liquids from less viscous to highly viscous.  We can call liquid-filling machines the heartbeat of a production-handling system, as their performance can influence the efficiency of the entire production line. The type of liquid machine used in the production line depends on the liquid to be handled by the machine. In this article, we are going to learn about types of beverage filling machines and their applications.

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1. Gravity Filling Machines: 

These machines are very simple compared to other machines used in the industry. These machines use gravitational force to fill the individual containers on the filling line from an overhead tank. Since the operation and construction of these machines are simple, they are very cost-effective.

Let's discuss the working principle: The liquid to be filled is stored in a tank above the nozzle when a container is correctly positioned under its filling nozzle. Liquid filling will start until the required filling level of the container is reached.

This type of filling machine is used for low-viscosity, thin, non-carbonated, free-flowing fluids that do not require any pumping pressure.

These machines have no complex parts and fewer moving parts, which simplifies maintenance and operation. For investors who don't want to invest large amounts, a small- and medium-sized beverage production company gravity-filling machine can be a good choice due to its low upfront cost.

Before you consider buying a gravity filler, you should ask yourself if your product is less viscous, non-carbonated, and free-flowing, or if you should buy a more complex machine.

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2. Piston and Positive Displacement Fillers:

When the liquid is thick and viscous (medium to high), this includes thick or pulpy fruit juices, syrups, sauces, creams, dairy products, jams, and pastes. Where a gravity filler won't be useful in this condition, piston or positive-displacement liquid-filling machines are used to deliver a consistent quantity of liquid into the container. These machines are very useful when you want to have an accurate volumetric filling.

These liquid filling machines use a piston that moves in a cylinder to measure and deliver the required fluid into the container.  When the piston moves backward, it creates a vacuum in the cylinder. The liquid enters from the tank into the cylinder due to the vacuum, and in forward movement, the same liquid is discharged into the container to be filled. If you are dealing with commercial products, filling an accurate amount is very important, as it is linked to your profit. If the container is overfilled slightly, then you give away your profit, and if it is underfilled, then your product might fail in quality. Piston fillers solve this problem by filling containers very accurately with adjustable speed. Liquid filling solution providers have modern systems with servo controls, encoders, and advanced pump technologies that improve efficiency further.

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3. Isobaric (Counter-Pressure) Filling:

Gravity filling and piston filling machines cannot handle carbonated drinks. Carbonated drinks have a unique challenge during the filling process. Since these drinks contain dissolved carbon dioxide, they require temperature and pressure to be controlled during the filling process. If the conditions of temperature and pressure are not controlled, CO₂ will escape, causing excessive foaming, inconsistent carbonation, product loss, and reduced beverage quality. To handle these problems, we can buy isobaric filling from liquid filling suppliers, which maintains and controls the pressure during the filling of the container. Before the filling starts, the pressure inside the container and the storage tank equalizes. The filling valve opens with a minimum pressure difference; under this condition, carbon dioxide won't escape from the liquid. After filling, the pressure is released before the filling valve closes. Carbonated soft drinks (CSDs), sparkling water, beer, and carbonated energy drinks all use this type of filling machine that prevents CO₂ loss and foaming.

These liquid filling machines are used for high-volume beverage production. An integrated system is arranged with multiple filling valves and processes numerous containers at the same time. Container types are mostly PET bottles, aluminum cans, and glass bottles.

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4. Hot Fill Systems:

If you want a liquid filling system to avoid preservatives, for this purpose, hot-fill systems use a combination of controlled thermal treatment and hygienic filling. This method will reduce microorganisms and also improve the microbiological stability of the liquid, increasing the shelf life of the product. This will be achieved with product temperature control, container compatibility, filling conditions, and cooling. The liquid is heated at an elevated temperature first, depending on the beverage formulation, to reduce microorganisms present inside the container. The liquid is then filled in the container and immediately closed to avoid any contamination. Temperature control is very critical in this process. If the temperature falls, the shelf life will be reduced. If the temperature increases excessively, the product quality will degrade. To achieve perfect temperature control, recirculation is provided so that when the machine is stopped temporarily, the temperature remains within a certain band. It should be remembered that not every liquid is suitable for hot filling.

If this system is designed correctly, it will be a combination of food safety, stability of product, shelf life extension, and reducing use of preservatives.

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5. Aseptic Filling Technology:

For beverages that are expensive or sensitive, we can use this kind of liquid filling method. Dairy products, premium fruit juices, plant-based beverages, and high-end functional drinks are all using this kind of method for filling. The main advantage of using this technique is that the product can be labeled as preservative-free. The product has a longer shelf life with no preservatives used. Health-conscious customers are always attracted to such products.

Let's talk about how it is different from a hot fill system. The beverage is processed separately to achieve commercial sterility, and containers are sterilized separately. Both come into contact during filling in a highly controlled environment. During the entire process, temperature, sterilization parameters, environmental conditions, and equipment hygiene are controlled. The major challenge for this liquid system solution is the complexity of the system.

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6. Net Weight Filling: 

When selecting the filling machine from a liquid filling machine supplier, it is very critical to decide whether the product is measured by weight or volume. Both types of machines are available. The choice depends on a number of factors like product density, viscosity, container, required accuracy, regulatory requirements, and production objectives.

In a net weight filling machine, the container is placed on an integrated weighing system, and the product is filled until the desired weight is achieved. Such an approach is used when the liquid to be filled is expensive, and small overfilling in a container causes significant financial loss.

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Conclusion:

We have discussed many different types of liquid filling machines. These are all easily available in the market from liquid filling machine solution providers, but Sky Machines (www.sky-machine.com) is one of the most experienced in this field; they have a complete range of filling machines for most beverage production companies. From the machines discussed above, it's very critical to decide which machine you should buy. If you buy the correct filling machine and it is integrated with the production line perfectly, it will definitely increase productivity, reduce waste, ensure consistent quality, and support sustainable long-term business growth.