Shrink wrap tunnel with variable set points

Details Shrink wrap tunnel with variable set points Shrink wrap tunnel with variable set points

2008-04-29

2008-04-29

Gravini, S. (Department: 3749)

Drying and gas or vapor contact with solids

Process

With nondrying treating of material

C034S212000

Reexamination Certificate

active

07363728

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. The code reader can be “trained” by setting up the parameters once under human operator control, scanning in the product code and storing the parameters and the product code together so the parameters are recovered from the memory when the product code is applied to the input device.

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