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Effective Stretch Wrapping
The goal of effective stretch wrapping is to securely unitize the load so that it can be shipped effectively with minimal cost.
Load configurations variy and have been classified, from most stable to least, as A, B, and C style loads. 

Shipping dynamics involve conditions that cause loads to fail.  These can be identified as vibration, sway, and sheer forces.
To insure an effective shipment, loads can now be stretch wrapped using "Pre-stretch" wrapping technology first developed by Lantech, Inc., in the 1980's.

This process stretches the film in a controlled manner prior to applying it to the load.  This maximizes stretchability and load holding forces while minimizing film neckdown.
 
The level of stretch obtained is designed to take advantage of the optimal performance characteristics of the film in the working range as shown in the graph below.  Pre-stretching the film to the working range shown on the film elongation curve provides maximum holding power to retain the load while yielding maximum film economy.
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