Treatment module for a treatment tunnel, treatment tunnel, and production system for a treatment module

A treatment module for a treatment tunnel which has one or more treatment modules following one another in a longitudinal direction, comprising at least one inner housing which has at least one surface element in the form of a bottom wall and/or a side wall and/or a top wall and/or an inner wall,

• wherein the at least one surface element has a longitudinal extent in the longitudinal direction and a transverse extent transversely to the longitudinal direction,
• wherein the at least one surface element is formed from prefabricated sheet metal cassettes, which have transverse sides with a cassette width in the longitudinal direction and longitudinal sides with a cassette length transversely to the longitudinal direction,
• wherein the surface element is divided at least in the longitudinal direction into a grid spacing corresponding to at least one cassette width of the cassettes,
• wherein (i) the cassettes are arranged within the surface element with their longitudinal sides transversely to the longitudinal extent and with their transverse sides parallel to the longitudinal extent of the surface element at least in some regions, or (ii) the cassettes are arranged within the surface element with their transverse sides transversely to the longitudinal extent and with their longitudinal sides parallel to the longitudinal extent of the surface element at least in some regions,
• wherein the inner housing is surrounded by a thermally decoupled outer housing, and
• wherein the inner housing is movable independently in the longitudinal direction in the case of a thermally induced length change.