Patent ID: 8357875

Claim:
A device for welding multiple foils to one another for use in a packaging machine, the device comprising: a laser that provides laser radiation; and a clamping unit configured for applying pressure to the foils in a predetermined area as well as for conducting the laser radiation used for the purpose of welding to the predetermined area; wherein the clamping unit comprises a sealing die top and a sealing die bottom, the sealing die top and the sealing die bottom being operable to clamp multiple foils, the sealing die top and sealing die bottom defining a sealed chamber when in a closed position, wherein the sealing die top includes a non-absorbing area and wherein the clamping unit further comprises a clamping plate moveable within a portion of the sealed chamber defined by the sealing die top and operable to clamp a cover foil and a lower foil to the sealing die bottom.