"The application of stretch film to pallets by hand is a slow and tedious job. Hand wrapped pallets are rarely secured with the optimum number of wraps, or with the ideal level of tension. Automatic machines are available for virtually all medium to high volume pallet wrapping operations:

Power Pre-stretch machines

Film core axles and applicator axles are set by gearing to deliver a very high and consistent level of film stretch.
Most application parameters can be preprogrammed. Suitable for medium to high output environments and most pallet types."