Abstract: A shrink wrap machine has a shrink wrap tunnel with an entrance and an exit. A conveyor transports products to be shrink wrapped from the entrance through the tunnel to the exit. A source of gas is coupled to the inside of the tunnel and bathes the products. A heater controls the gas temperature in the tunnel. A pump controls the gas volume and/or velocity in the tunnel. An input device receives product identification information. A memory stores different process parameters, namely gas volumes, gas velocities, conveyor speeds, and/or temperatures applicable to the product identification information. A computer selectively retrieves process parameters from a memory responsive to the input device and sets the pump, the heater, and/or the conveyor to match the retrieved process parameters. The computer and memory are preferably a programmable logic controller (PLC). A machine readable product code such as UPC is as the product identifier and a code reader as the input device.