Device and method for generating a liquid film of a liquid medium in a film bag, and assembly for the controlled exposure of a liquid medium in a film bag using physical radiation

A method for generating a liquid film of a liquid medium in a film bag, the method comprising:

• providing a device including:
• two accumulating surfaces spaced apart by an accumulating distance, between which the film bag is arrangeable for transportation along a transport direction;
• a braking element arranged downstream of the accumulating surfaces in the transport direction, which braking element is arranged to brake the film bag;
• a running surface convexly curved in the transport direction and set up and arranged such that the film bag braked by the braking element is spanned on the running surface behind the braking element, wherein at least a first accumulating surface of the two accumulating surfaces is formed at least in regions by a driven first conveyor belt which is arranged to convey the film bag in the transport direction;
• a controllable tensioning element downstream of the braking element in the transport direction, the controllable tensioning element arranged to span the film bag on the running surface between the braking element and the tensioning element;
• and
• a control device operatively connected to the tensioning element and to one of the first conveyor belt and a belt drive for the first conveyor belt to control a running speed of the first conveyor belt, the one of the first conveyor belt and the belt drive for the first conveyor belt being controllable independently of the controllable tensioning element;
• and
• transporting the film bag in the transport direction through the device and
• producing a uniform liquid film having a temporally constant layer thickness by controlling at least one belt drive for the first conveyor belt and the tensioning element independently of one another.