What are the excellent properties of EVOH we produce?
EVOH's Excellent Nitrogen Barrier Properties
Compared to its superior oxygen barrier properties, EVOH exhibits even better nitrogen
barrier properties, exceeding double that of oxygen. This property is particularly important
for many nitrogen-sealed foods, as sausages and hams sliced thinly in a central factory
cannot be sold in supermarkets. These foods are typically packaged in trays or foil and
filled with nitrogen before sealing. The sealed EVOH packaging not only blocks oxygen
ingress but also allows the food interior to be filled with nitrogen, extending its shelf
life.
EVOH's excellent carbon dioxide barrier properties.
Generally, carbonated beverages containing CO2 bubbles are sold in glass bottles. PET, the
first packaging material to be tried, can only store water and soft drinks with little or no
CO2, and it cannot be stored for long periods of time. The reason is that relatively high
levels of CO2 permeate all known polymers: CO2 is significantly more soluble in organic
matter than oxygen or nitrogen. This is also true for EVOH, but the permeability is still
much lower than other resins, at approximately 1/50th that of PET.
As a result, co-extruded PET/EVOH/PET bottles are gaining market favor. They offer a longer
shelf life without altering the flavor or foam quality, and are even replacing aluminum cans
for beer. These packaging materials are recyclable (the materials can sometimes be used as
raw materials for other products), making them very environmentally friendly. Furthermore,
this approach helps balance glass and aluminum resources.
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