What Is Vacuum Filling Machine And How Does It Work?

Introduction

In the packaging industry, different products need different filling systems to ensure filling accuracy, production quality and efficiency. Vacuum filling machines are the common type of packaging equipment in specific products packaging, especially suitable for liquid products that require consistent liquid levels. This article will introduce what a vacuum filling machine is, its working principle, its advantages its types and what to consider when choosing a vacuum filling machine.

What is a Vacuum Filling Machine?

ZONESUN vacuum filling machine works on the principle of negative pressure (vacuum) to fill liquids.The vacuum system of vacuum filler can create a negative pressure or vacuum environment inside the bottle, this makes liquid be drawn into the container under the pressure difference, thus completing the filling process.

The biggest advantage of this filling method is that it can realize uniform liquid level filling. This means that even if there are some errors of bottle shape and volume, the liquid level inside the bottle will always keep basically consistent. Therefore, it is widely used in glass bottle packaging (such as perfumes and lqiuor).

How Does Vacuum Filling Machine Work?

Step 1: Move Bottle to Filling Station

After the filling process begins, empty bottles are manually or automatically moved to the filling station. The filling nozzle seals against the bottle mouth, ensure the smooth oepration of subsequent vacuum process.

Step 2: Create Vacuum Environment

The vacuum system of the filling equipment starts to work and create a negative pressure environment inside the bottle by evacuating air.

Step 3: Fill Liquid into the Bottle

Once bottle inside is vacuum, liquid in the storage tank will be drawn into the bottle under the pressure difference. This filling method is more stable and can reduces liquid splashing or cut down on the foam.

Step 4: Return the Excess Liquid

When the liquid reaches the set level, excess liquid is returned to the storage tank through a backflow hose. This makes a consistent liquid level in each bottle.

Main Components of a Vacuum Filling Machine

ZONESUN vacuum filling machine commonly consists of the below machine components to ensure smooth operation.

Vacuum System: The vacuum system is designed to create a negative pressure environment inside the bottle. Depending on the machine design, it can be a venturi vacuum generator or a vacuum pump.

Filling Valves: Filling valves connect to the bottle mouth and can control the flow of liquid, helping to realize stable liquid level control. Filling valves may be different according to different products.

Storage Tank: The liquid storage tank stores the liquid material to be filled and provides a stable liquid supply.Meanwhile, in some machine designs, excess liquid can also be returned to the storage tank via a backflow hose.

Liquid Backflow System: Once the set liquid level is reached, excess liquid flow back to the storage tank through the backflow hose and keep uniform liquid level.

*The filling valves of ZONESUN vacuum fillers are designed with two separate channel: one for product filling and another for liquid backflow. When the liquid reaches the set liquid level, excess liquid is drawn back to the tank through another channel.

What are Advantages of Vacuum Filling Machine?

Compared to other types of filling equipment, ZONESUN vacuum filling machines have several distinct advantages:

① They can eliminate errors caused by glass bottle production, ensuring a uniform liquid level in each bottle, making them suitable for many irregularly shaped glass bottles.

② The filling work is processed in a sealed negative pressure environment, significantly reducing the contact between the filling material and air, and minimizing the volatilization of aromatic substances, this is good for packaging perfume or liquor products.

③ Once the set liquid level is reached, excess filling material can be automatically recovered, reducing material waste.

④ Vacuum filler can effectively reduce liquid foaming, making them suitable for certain special liquids.

How to Choose the Right Vacuum Filling Machine

When selecting a vacuum filling machine, consider the following aspects:

First, the viscosity of the product. Vacuum filling machines are suitable for low-viscosity, high-flow-rate liquids like perfume, liquor.

Second, certain requirements apply to the bottles: Vacuum filling requires a tight seal between the bottle mouth and the filling nozzles to form a seal. Therefore, the bottle mouth must be flat, and the bottle body cannot be too soft(some plastic bottles is not suitable for vacuum filling machine); otherwise, an effective vacuum environment cannot be established.

Third, production requirements. ZONESUN Technology fully automatic equipment can control the filling error to ≤±1%, with a speed of 20-30 bottles/minute.

Additionally, the level of automation and whether customized functions are needed should also be considered.

Conclusion

For manufacturers requiring accurate liquid level filling and cleaner packaging results, ZONESUN TECHNOLOGY LIMITED provides customized vacuum filling machines and complete packaging solutions for beverages, cosmetics, pharmaceuticals, and chemical products. Our packaging experts can recommend suitable filling systems based on your liquid characteristics, container types, production capacity, and packaging requirements to help improve filling consistency, reduce product waste, and optimize production efficiency.