Abstract: A sheet-processing machine includes a turning device. Sheets can be conveyed, by a sheet conveyor system, from a sheet guide cylinder in the turning device, and can be conveyed in a sheet conveyor direction on a sheet conveyor path. A sheet guide element is provided beneath or along the sheet conveyor path. A deionization device is assigned to the sheet guide element. The deionization device can provide positive and negative ions.

Abstract: The present invention relates to a method and a heating device for thermoforming thermoplastic semi-finished products. According to the method locally different thermoforming behaviour during shaping to give a three-dimensional moulded part is achieved by locally different heating of the semi-finished product (1). Two contact heating devices (2) are used for the heating of the semi-finished product (1) and are brought into contact with the semi-finished product (1) simultaneously from opposing sides. Each contact heating device (2) comprises an individual heating circuit (6) formed of a ceramic heating layer on a thermally-insulating support (7), the locally different heating being achieved by means of a locally differing geometrical design of the heating circuits (6) on the support (7). The method and the heating device permit selective control of the wall thickness distribution in the moulded part to be produced without the use of prestretching male moulds or radiant heaters.