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Quick Guide to Stretch Wrapping

October 18, 2019

The first thing you should know about stretch wrapping is containment force. Containment force is the hugging pressure that holds a pallet load together. Containment force is vital for securing loads and minimizing damage. In fact, containment force is the key metric for reducing damage and ensuring you have safe-to-ship loads. How do you find containment force? We find containment force by multiplying the number of revolutions of Stretch Film by the wrap force tightness. You should be measuring containment force on multiple points across your load (typically top, middle, and bottom). Determining what your goal containment force should be based on actual shipping data and experience. However, here's a link to a recommendation chart that will help you figure out the right amount of containment force for your pallet loads. Lock Your Load to Your Pallet Another key step in effective stretch wrapping is locking the load to the pallet. Most stretch wrappers encourage you to wrap the load all the way to the bottom of the pallet. On the surface, this might seem like an adequate method for creating a pallet to load bond, but it leaves your load vulnerable. The vulnerability of this method is exposed when the pallet is ready to move. Most pallets are moved about with a pallet jack or forklift truck. Metal prongs, or forks, are inserted into the base of the pallet and the pallet is supported as it is moved from the underside of the load by these prongs. If, however, the stretch film is wrapped all the way to the bottom of the pallet the prongs must be inserted through the film. Once the film is breached you begin to lose containment force and risk a tear or rip that completely compromises the load. The simplest way to avoid this problem is by creating a cable with the bottom few inches of the stretch film. At the end of the wrap cycle, the film is automatically rolled into a tight cable and driven down just below the top deck boards of the pallet. The cable is tight enough to lock the load to the pallet and is high enough to clear the forks as they pick up the load.

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