How to choose heat shrinkable film during packaging of heat shrink packaging machine
How to Choose Heat Shrinkable Film for a Heat Shrink Packaging Machine
Heat shrink packaging, also known as shrink wrapping, is a popular method used in the food and product packaging industry. It involves using heat-shrinkable plastic films that are wrapped around products or containers and then exposed to heat, causing them to contract and tightly conform to the shape of the item. This process is commonly performed using a heat shrink packaging machine, which ensures efficient and secure packaging.
When using a heat shrink packaging machine, selecting the right type of heat shrinkable film is crucial. The film must have an appropriate shrinkage rate in both the longitudinal and transverse directions. The shrinkage rate is calculated as (L1 - L2) / L1 × 100%, where L1 is the original length and L2 is the length after being immersed in water at 120°C for 1-2 seconds. Heat shrinkable films are manufactured by stretching the material during production and then cooling it. When reheated, they shrink back to their original size. Therefore, the ideal shrinkage ratio should be around 50% in both directions, along with good heat seal strength, tensile strength, impact resistance, tear resistance, and proper moisture and oil resistance.
Common materials used for heat shrinkable films include polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polyvinylidene chloride (PVDC), polyester (PET), polystyrene (EPS), and ethylene-vinyl acetate copolymer (EVA). Each material has different shrink characteristics and temperature requirements, which are often illustrated in charts or diagrams.
Compared to regular plastic films, heat shrinkable films offer better strength, transparency, and elongation. When heated, these films can stretch up to 1:4 to 1:7 before shrinking, whereas ordinary films only stretch up to 1:2. There are two main types of heat shrinkable films: biaxially oriented films, which shrink evenly in both directions, and uniaxially oriented films, which shrink in one direction only. Biaxial films are ideal for fresh food, tray packaging, and container sealing, while uniaxial films are commonly used for label wrapping on bottles, jars, and other cylindrical items.
The heat shrink packaging machine offers numerous benefits, including fast packaging speed, high efficiency, low cost, easy operation, and convenient transportation and sales of the packaged product. As a result, it is widely used in the food processing and retail industries.
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