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Plastic granules can be engineered to exhibit a wide range of versatile barrier properties, depending on the specific type of plastic used and the additives or coatings incorporated during the manufacturing process. These barrier properties are essential for protecting products from various environmental factors and contaminants. Here are some of the versatile barrier properties that plastic packaging can offer:
Moisture Barrier: Plastic packaging materials can be designed to provide excellent moisture resistance, preventing the ingress of water vapor and moisture into the packaged product. This is particularly important for preserving the freshness and quality of foods, pharmaceuticals, and electronic components.
Gas Barrier: Certain plastics, such as ethylene vinyl alcohol (EVOH) and some specialty films, have exceptional gas barrier properties. They can prevent the permeation of oxygen, carbon dioxide, and other gases, which is crucial for extending the shelf life of perishable goods and protecting sensitive products.
Aroma and Flavor Barrier: Some plastics are engineered to provide a barrier against the escape or entry of aromas and flavors. This property is essential for packaging products like coffee, spices, and other foods where the retention of aroma and taste is critical.
Light Barrier: Plastics can be designed to block or filter specific wavelengths of light, such as ultraviolet (UV) rays. This is important for protecting light-sensitive products, like pharmaceuticals, cosmetics, and certain food items, from degradation due to exposure to light.
Chemical Resistance: Plastic packaging materials can be formulated to resist chemical interactions with the packaged product or external substances. This is particularly important for packaging chemicals, solvents, and industrial products.
Electromagnetic Interference (EMI) Shielding: Certain plastics, when combined with conductive additives, can provide EMI shielding to protect sensitive electronics from electromagnetic interference.
Tamper Resistance: Plastic packaging can be designed with tamper-evident features, such as seals and barriers, to ensure product integrity and consumer safety.
UV Protection: Plastics can be formulated to block or absorb UV radiation, protecting products from UV-induced degradation and discoloration. This is commonly used in packaging for sun-sensitive items like cosmetics, pharmaceuticals, and outdoor equipment.
Mold and Mildew Resistance: Plastics can be engineered with additives that inhibit the growth of mold and mildew, making them suitable for packaging items that may be susceptible to fungal contamination.
Barrier to Odors and Contaminants: Plastic packaging can effectively block the transmission of unwanted odors and contaminants from the external environment, ensuring the product remains untainted.
Water Vapor Transmission Rate (WVTR): Plastic films can be manufactured to have a specific WVTR, controlling the rate at which water vapor passes through the packaging material. This is crucial for products like dry foods and electronic components.
Grease and Oil Resistance: Some plastics, especially those used in food packaging, can resist the absorption of grease and oils, ensuring the integrity of the packaging and the quality of the contents.
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