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Measuring the performance of shrink film is vital to verify that the shrink film meets the requirements of various packaging applications. Shrink film's performance is influenced by numerous factors including its thickness levels, material type, شیرینگ پلی اتیلن and application technique. Here are the methods to measure the performance of shrink film:

Key Performance Indicators:
Stretch Ratio: One of the essential performance metrics of shrink film is its stretch ratio, which refers to how far the film can stretch without breaking. To measure the stretch ratio, you need to apply a load to the film at a set velocity and record the deformation of the film. The stretch ratio is calculated by dividing the film's deformed length by its original length.

Tensile Strength: A Critical Test
Tensile strength is another critical parameter for measuring the performance of shrink film. It represents the maximum stress that the film can withstand before breaking. To measure tensile strength, you need to use a tensile tester to apply a uniform load to the film at a constant rate until it breaks. The tensile strength is calculated by dividing the maximum load by the cross-sectional area of the film.

Dunnage Compression: A Common Issue
Dunnage compression is a common problem associated with shrink film packaging. It occurs when the packaging material does not provide adequate support for the packaged items. To measure dunnage compression, you can use a dunnage compression tester. The device applies a load to the packaged item through a series of rollers, and the resulting distortion of the packaging material is recorded.

Evaluating Packaging Stability: A Key Metric
Packaging stability is an essential performance parameter for shrink film, particularly for applications involving irregularly shaped items. To evaluate packaging stability, you can subject the packaged item to external forces such as temperature changes. The packaged item's stability can be measured by assessing the level of deformation and the risk of failure.

Measuring Shrinkage Percentage: An Important Parameter
Shrinkage percentage is the degree to which the film reduces in size after cooling or freezing. It is an important parameter to measure the performance of shrink film. The shrinkage percentage is typically measured by cutting a sample of the film and then measuring its length and width before and after shrinkage.