Important quality characteristics of Evoh
Ever since this substance was developed, the packaging process was greatly improved due to its excellent sealing qualities.
These sheets, when used to pack food
and bottled products stop the passage of air and oxygen which reduce
contamination from bacterial and spoiling.
Applications requiring high sealing capacity have layers that reduce cracking when folded. These stop the material from breaking when folded. Stresses imposed by transporting, wrapping and handling products do not break the layer.
Since the materials are an air tight foil; entry of aroma, bad and other industrial smells into the protected products is limited. In addition, goods with aroma and other pleasant smells are preserved inside.
These foils not only limit gases entry but also liquids. They prevent evaporation of oils, hydrocarbons and other organic solvents.
Latest cutting edge technology
Vacuum bags
are made of high resistant barrier materials such as PA/EVOH, etc The
thickness of the pouch are increased or decreased as per the
customization requests from various industries. This product is
available in different sizes and offers protection and moisture
resistant properties to the products.
What Food Industry has to Share about Vacuum Bag Sealing?
Currently, most of these strips are developed using modern technology to improve their sealing and shielding properties.
They are formulated using specialized
extrusion equipments that use blown foil technology which allow the
production of flat and very strong strips.
Most strips are also manufactured from sophisticated materials such as Evoh (Ethyl vinyl alcohol copolymer), nylon, polyolefins, polypropylene and plastomers.
Achieving specially designed rolls using co extruded films
Currently, multilayered seals are
preferred in medical, food and chemical packaging. The technology
entails using two or more coating of thin strips to improve the
properties of the foils.
By using one coating as an anti leak and an anchor coating with high strength; the resulting barrier is able to withstand fracture and tear as well as provide excellent sealing ability.
Special barriers used in medical wrapping have deposits of anti microbial layer added to the barrier material. This prevents entry of bacterial and other microorganisms and ensures aseptic wrapping is achieved.
Cast grade sheets manufactured by deep draw molding are used for high strength applications in food and industrial packaging.
Bottling agrochemicals using Evoh laced bottles
Agrochemicals and pesticides must be
packaged well to prevent entry of air, microbes, water and other
harmful items. The covering materials must also not be attacked by the
product inside the bottle.
Bottles are therefore laced with a shielding sheet to prevent leakages and corrosion of the chemicals. This creates a leak-proof and anticorrosion coating.
Anti corrosion properties of these materials
Ordinary protective strips made from
organic films are corroded by industrial and agrochemicals. To prevent
this, the internal layer of the shield is made using aluminum, zinc
and alloys to prevent corrosion.
Metalized grade foils have shielding
coating and a thin foil of aluminum added to increase strength and
prevent anti-corrosion. These films are widely used to pack foods,
pharmaceuticals and industrial chemicals.
Economics of Evoh barrier films as compared to other materials
Evoh barrier films
have special characteristics which reduce wrapping costs. A one
millimeter Evoh is equivalent to ten meters of LPDE (low density
polyethylene). High strength also allows for high speed packaging and
reduces cost.
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