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Shrink Force
This is usually measured in PSI and indicates the force the shrink wrap exerts on the product. Knowing the shrinkage force is very useful when packing multipacks that need to be tightly packed together to avoid damage. Especially useful if you adjust the shrinker accordingly. It has a high shrinkage force and is fine if you are packing wood.
However, if you're packing small stacks of paper or lightweight cardboard boxes, it can make a difference. Historically, polyolefin films have been high shrink-strength films. Polyvinyl chloride (PVC) film has a low shrinkage force. A new polyolefin formulation reduces shrinkage forces.
Shrink Orientation
Shrink films are either bi-axially oriented or preferentially oriented. Bi-axially oriented films shrink evenly in both directions (longitudinal or transverse).
Stretched films preferably have different shrinkage in both directions. Advantages of preferentially oriented films include using less film and avoiding product distortion.
Shrink Percentages
In addition to using preferentially oriented films to change the shrinkage, it is also possible to use biaxially oriented films with reduced shrinkage. 40/40 30/30, 20/20.
Another related feature is free to shrink. Unfortunately, this isn't a tip for getting free shrink wrap, but it's equally important. Free shrink is the ability of the film to shrink before it contacts the product. High levels of free shrink allow packages with difficult shapes and sizes to look great.
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Resistance to Puncture and Tear
This measures how hard it is to tear the foil and how hard it is to tear the foil after it has been pierced.
Films with high puncture resistance often have low tear resistance and vice versa. If you have to compromise, choose the more important properties (e.g. puncture resistance is very important if you have a window box). Choose shrink wrap for product security and easy access to the actual product. Store the shrink wrap in a cool (but not too cold) storage area to prevent the wrap from weakening before use.
Moisture Vapour Transmission Rate
This characteristic describes the amount of moisture that passes or does not pass through the film.
Consider this characteristic for extended shelf life when low moisture transfer in and out of the package is important. A consideration for reducing or eliminating haze is adjusted atmosphere packaging.
Antifog
Anti-fog films are used on food (fresh and frozen) to reduce moisture build-up on the film.Moisture causes fogging, making it impossible to see the product through the film.
Odour Barrier
Anti-odour films are used to prevent unacceptable odours from entering or exiting the package. Don't let your customers down after buying a product with a bad smell.
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