Many companies use rotary vane vacuum pumps in filling applications because of their low initial cost, small footprint, and ability to operate without water. However, due to the regular maintenance required on rotary vane pumps, their lifecycle costs far exceed those of liquid ring vacuum pumps.
Nash liquid ring vacuum pumps are oil-free, require little maintenance and are well-known for their reliability. They excel as the vacuum source in filling operations because liquid is an intrinsic part of the pump and any carryover from the filling system is easily handled with no reduction in performance or production.
Liquid Ring Advantages For Bottle Filling Under Vacuum
Increased operating efficiency
Reduced operating costs
One Moving Part
Reduced downtime in harsh operating conditions or locations
Reduced maintenance costs
Various Materials of Construction
Satisfy many industrial application requirements
Typical Applications For Bottle Filling Under Vacuum
Nash vacuum is used to evacuate the air from bottles just before they are filled with the desired
beverage. The benefits of applying vacuum are two-fold. First, it reduces the time required to fill the bottle, which increases throughput. The other reason vacuum is applied is to remove oxygen from the bottle, which could react with the beverage and compromise the taste and aroma of the drink.
Container Filling Sequence
The container filling sequence consists of the following steps:
Creating a vacuum in the container
Flushing CO2 to remove air from the container
Pressurizing the container
Filling the container
Depressurizing the container
Sealing the container
These fillers draw a vacuum on an overflow container and attach a hose from the filling head and from the head to the product. The vacuum system removes air from the container, which in turn induces the flow of product into the bottle. The product fills to the level of the vacuum vent, and any surplus is drawn into the overflow system. This method is not effective on plastic bottle filling, but is still used for glass bottles and is especially common when filling products like nail polish.
These fillers are unique to the carbonated beverage industry. There are three parts to the heads of these fillers: vent, CO2 pressurizer and fill tube. The purpose of the CO2 is to keep the already existing carbonized beverage in solution and to minimize foaming.
The counter-pressure fillers process contains the following steps:
The head seals and the vent and CO2 pressure valves are opened
Air is forced out of the bottle and replaced with the heavier CO2
The vent is then stoppered down and the heads force chilled carbonated liquid down the sides of the container in a swirl pattern to minimize foaming
Once the fill height is reached, the vent completely closes at the same time the product is cut off
Quality & Sustainable Solutions
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