Device and continuous dyeing process with indigo

A continuous dyeing device (100) with indigo and reduction dyes for warp yarn chains (3) and/or fabrics, comprising at least one hermetically sealed dyeing compartment (1), and at least one hermetically sealed compartment (2) for the diffusion and fixing of the dye on said yarn (3), said at least one hermetically sealed compartment (2) being situated downstream of said dyeing compartment (1) and being functionally and hermetically connected to said dyeing compartment (1) by means of a tunnel (4), means (i2) being present inside said compartments (1, 2) and said tunnel (4), for the entry of inert gas or deoxygenated air, characterized in that one or more means (14, 14′) for the direct application of said dye onto said yarn (3) also being present inside said dyeing compartment (1) and at least one tank (8) for humidifying the environment, wherein each of the at least one tanks (8) is equipped with at least one heating coil (9) for the evaporation of water treated (10), situated close to the bottom of said at least one hermetically sealed compartment (2), for the humidification of said at least one hermetically sealed compartment (2), in order to prevent the evaporation of the dye applied on said yarn (3), and at least one means (7) for heating said yarn (3) leaving said dyeing compartment (1), are present in said at least one hermetically sealed compartment (2).