flexible options for minimising dissolved oxygen
Until recently, nitrogen was only available in delivered form, in bulk or cylinder. Now, a
more flexible and economic option is available. MAXIGAS is a modular range of
nitrogen generators that produces the nitrogen from compressed atmospheric air.
MAXIGAS is able to produce a range of purities up to 99.999%, and can be selected to
provide nitrogen requirements for a range of applications in the winery and packaging
facilities.
Nitrogen is used to prevent contact of the wine with air, thereby reducing the potential
for oxygen uptake. During bulk storage, the use of sealed vats means that positive
nitrogen pressure can be used, ensuring that volume changes due to temperature
fluctuations do not lead to the ingress of air. Nitrogen blanketing of unsealed vats is
also possible, a small continuous flow will ensure that air cannot diffuse into the
headspace through vents and will also compensate for volume changes. During
emptying, the flow of nitrogen can be increased to fill the head-space and in sealed
systems can be used to aid the propulsion of the wine during vat to vat transfer or
during packaging. Ensuring that oxygen levels are kept below 0.5% will also prevent the
growth of aerobic microorganisms.
Use of filters from the BIO-X and TETPOR families on tank vents and nitrogen inlets
will ensure that particulate and microorganisms are removed from the gas streams.
During bottling, the use of nitrogen as an alternative to water for bottle flushing is
possible. Water is often an expensive commodity, especially where extensive treatment
prior to use is required. Use of a dry flushing technique also improves the hygiene in the
bottling area, as condensation and splashes provide opportunity for microorganisms to
flourish. Flushing the bottles with nitrogen immediately prior to filling ensures that
minimal air is trapped in the head-space of the bottle.
Plastic bottles and cartons benefit from a small drop of liquid nitrogen being dropped
onto the wine just before closure. When the nitrogen evaporates, the small additional
pressure improves the crush resistance of the package.
- On-demand nitrogen up to 99.999% purity.
- Modular, space-saving design that can be expanded as
requirements increase.
- Low maintenance.
- Removal of particles, aerosols and bacteria from nitrogen
distribution lines and tank vents.
- Potential reduction in water use in bottle flushing.
