The dispensing and transport tanks from Duotank all work with an Inliner/Beerliner, an essential component that ensures the reliability and user-friendliness of the system.
Functioning of Inliners
An inliner is essentially a plastic bag placed inside a tank to hold beer. Duotank's inliners are made entirely of (L)LDPE and include an EVOH barrier. This material combination prevents oxygen from coming into contact with the beer, ensuring the freshness of the beer.
The inliner's connection is linked to the tank's outlet, forming an airtight seal when the tapping unit is inserted. This design guarantees that no oxygen can reach the beer, preserving its quality.
Inliner made of LLDPE
Piercing Unit
Benefits of Inliners
- Freshness of the beer: The oxygen barrier keeps the beer fresh for longer.
- Hygiene: Disposable liners minimize the risk of contamination as they are replaced after each use.
- Easy handling: The liner unfolds automatically when filling the tank, allowing for a smooth flow of beer.
- Sustainability: Duotank liners are fully recyclable.
- Cost efficiency: Instead of using CO₂ for tapping, normal compressed air is used, reducing costs and at the same time being environmentally friendly.
Using an Inliner
Before a tank is filled, the inliner is unpacked and its connection is disinfected with alcohol. It is then attached to the tank outlet and unrolled along its entire length so that the beer can flow smoothly and the inliner can unfold smoothly. After closing the manhole opening, air pressure (back pressure) is applied to the tank.
The tank can then typically be filled from a transport tank in a beer delivery truck. The constant flow of beer ensures that the inliner unrolls automatically without tearing. Once the tank is filled, it is connected to the tap, and the beer is ready to be served to the customers!
After using the inliners
Inliners are designed for single use, meaning they need to be replaced with each new filling. Duotank places great emphasis on making this component more sustainable. The inliners are made of a single type of plastic and are fully recyclable.
Currently, used inliners are not recycled into new inliners. However, the recycled material is used in other plastic products, giving the inliners a second life.
