Heat Seal Coverings are unique polymeric coatings that are applied to various substrates to enable heat sealing functionality. When two surfaces coated with a Heat Seal Coveringsare pressed together under heat, the coatings soften and fuse to create a strong seal. These specialized coatings play a critical role in food packaging, medical packaging, and other industries where heat sealing is required.
Composition and Characteristics of Heat Seal Coverings
Heat Seal Coverings are composed of specific polymers formulated to have a precise melting point. Common polymers used include polyethylene, polypropylene, polyvinyl chloride (PVC), ethylene-vinyl acetate (EVA), and polyester. The coating composition determines its melting point, which is carefully engineered to the specific application. For example, food packaging typically requires Heat Seal Coverings that melt between 80-150°C.
A key characteristic of Heat Seal Coverings is that they must re-solidify quickly after sealing to form a strong, permanent bond. These coatings also need to be heat, moisture, and chemical resistant to protect the contents of the package. Additional characteristics such as clarity, flavor/odor neutrality, and recyclability may be required depending on the end-use application.
Applications of Heat Seal Coatings in Various Industries
Food Packaging
Heat Seal Coverings play an indispensable role in food packaging by providing a reliable seal to contain and protect food products while preserving freshness. They are commonly applied to plastic films, sheets, and bags used to package snacks, frozen foods, coffee, pet food and many other products. The seal helps extend shelf life by preventing contamination and moisture loss.
