A method and apparatus are provided for restricting the application of formatting to the contents of an electronic document. The present invention further relates to a method for the production of such a nanoparticulate composition. Filtration of undesirable low energy radiation may be employed using an attached filter element. This allows for significant power reduction in the frequently occurring scenario where all processors are not driven to their limits by prevailing system requirements. The invention presents a technology capable of equalizing the length of optical paths if the regulation of optical unit in height direction is different at both sides of the rotary polyhedral mirror. The roller spacing of a top rolling roller pair 31 arranged on the exit side of a hopper 2 of a rolling section 4 is variable.