Treatment machine for flexible material webs , in particular in the form of a plastic film which can be passed through treatment furnaces, said treatment machine having the following features: - the treatment machine comprises at least two successive zones in an extraction direction (A) of the material web , - at least one neutral zone is provided between at least two successive zones in the extraction direction (A), - the zone upstream from the at least one neutral zone comprises a zone outlet wall provided with an outlet slot and/or a neutral zone wall , through which the material web exits in the extraction direction (A) from the upstream zone into the neutral zone , - the zone subsequent to the neutral zone in the extraction direction (A), comprises a zone inlet wall and/or a neutral zone wall , which is provided with an inlet slot through which the material web enters the trailing zone in the extraction direction (a), - in the at least one neutral zone , a nozzle arrangement is provided, adjacent to a zone exit wall and/or a leading neutral zone wall on the one hand, and/or adjacent to the chamber inlet wall and/or a trailing neutral zone wall on the other hand, via which nozzle arrangement is provided, via which a gaseous fluid flow (S) reaching a material web is generated, characterised by the following further features: the nozzle arrangement of the nozzle arrangement leading in the neutral zone and/or the nozzle arrangement trailing in the neutral zone is designed in such a way - that the respective gaseous fluid flow (S) is directed at a slightly oblique angle (a) of less than 45° in the direction of the adjacent zone exit wall and/or the leading neutral zone wall or the zone inlet wall and/or the trailing neutral zone wall , and - that the nozzle arrangement is formed such that the gaseous fluid flow (S) flows following the zone exit wall or the leading neutral zone wall or the zone inlet wall and/or the trailing neutral zone wall as far as the material web . - the treatment machine comprises at least two successive zones in an extraction direction (A) of the material web , - at least one neutral zone is provided between at least two successive zones in the extraction direction (A), - the zone upstream from the at least one neutral zone comprises a zone outlet wall provided with an outlet slot and/or a neutral zone wall , through which the material web exits in the extraction direction (A) from the upstream zone into the neutral zone , - the zone subsequent to the neutral zone in the extraction direction (A), comprises a zone inlet wall and/or a neutral zone wall , which is provided with an inlet slot through which the material web enters the trailing zone in the extraction direction (a), - in the at least one neutral zone , a nozzle arrangement is provided, adjacent to a zone exit wall and/or a leading neutral zone wall on the one hand, and/or adjacent to the chamber inlet wall and/or a trailing neutral zone wall on the other hand, via which nozzle arrangement is provided, via which a gaseous fluid flow (S) reaching a material web is generated, - that the respective gaseous fluid flow (S) is directed at a slightly oblique angle (a) of less than 45° in the direction of the adjacent zone exit wall and/or the leading neutral zone wall or the zone inlet wall and/or the trailing neutral zone wall , and - that the nozzle arrangement is formed such that the gaseous fluid flow (S) flows following the zone exit wall or the leading neutral zone wall or the zone inlet wall and/or the trailing neutral zone wall as far as the material web . <EOS>