Unraveling Polyolefin Shrink Film Composition: Explained.
Have you ever wondered what "polyolefin" means? Or how shrink film works? Maybe you're even involved in the packaging industry and are curious about the composition of shrink film. In any case, this article will explain the composition of polyolefin shrink film and demystify common industry terms.
What is Polyolefin?
Polyolefin is a type of polymer made from olefins, which are unsaturated hydrocarbons. Polyethylene and polypropylene are two of the most common polyolefins used in the packaging industry. Polyolefins have a low surface energy, which means they repel water and other substances. This property makes them ideal for use in packaging as it prevents moisture and air from entering the package.
What is Shrink Film?
Shrink film is a type of packaging material that shrinks when heated. The heat causes the film to become pliable and conform to the shape of the product it is covering. Once the film cools, it retains its new shape, providing a secure, tamper-evident seal.
Understanding Polyolefin Shrink Film Composition.
Polyolefin shrink film consists of two layers. The first layer is a biaxially oriented polypropylene (BOPP) film, which provides the strength and durability of the film. The second layer is a low-density polyethylene (LDPE) film, which provides the shrinkability of the film.
The BOPP layer is responsible for the high clarity, gloss, and stiffness of the shrink film. The polypropylene used in BOPP films is a thermoplastic polymer that is known for its excellent barrier properties. It has good resistance to water, oils, and chemicals, making it ideal for use in the packaging industry.
The LDPE layer is responsible for the shrinkability of the film. LDPE is a thermoplastic polymer with a low melting point, which means it can be easily heated and molded into shape. It has a high degree of elasticity, making it ideal for use in shrink film. The low density of LDPE also means that it is lightweight and doesn't add unnecessary bulk to a package.
Shrink Film Additives.
In addition to the two primary layers of polyolefin shrink film, other additives may be included to enhance the packaging performance. For example, slip agents can be added to reduce friction between the film layers, making it easier to separate them during the packaging process. Anti-block agents may also be added to prevent the film from sticking together during storage.
Conclusion.
Polyolefin shrink film is a widely used packaging material that provides excellent protection and tamper-evidence for various products. Understanding the composition of polyolefin shrink film can help you choose the right packaging material for your products.
Remember, not all polyolefin shrink films are the same. Suppliers can offer different formulations that can be customized for your specific application. For more information about polyolefin shrink film, please contact us to discuss your needs.
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