Method for mixing a product to be conditioned in a conditioner, comprising the following steps: - partially filling the conditioner with the product, - rotating a mixer shaft of the conditioner in a first direction of rotation (R') such that at least one paddle, which is arranged on the mixer shaft only in an initial region of the mixer shaft, substantially brings about no conveying of the product in the initial region in a direction parallel to the mixer shaft, wherein the product is held in the initial region of the mixer shaft, and wherein, in a portion of the conditioner that is adjacent to the initial region, other elements are arranged on the mixer shaft that bring about either no conveying or bring about backward conveying of the product, wherein the paddle comprises a planar element with a working surface and a back surface, which element, during intended use, is positioned substantially on a plane perpendicular to an axis of rotation of the mixer shaft and has a fastening means for fastening the paddle to the mixer shaft, wherein the working surface is inclined by a working angle on the one side, and the back surface is inclined by a back angle on the other side of the plane perpendicular to the axis of rotation of the mixer shaft, wherein the back angle is less than the working angle, - rotating the mixer shaft in a second direction of rotation such that the at least one paddle brings about conveying of the product in a direction parallel to the mixer shaft, wherein the product is conveyed through the conditioner via the portion of the conditioner that is adjacent to the initial region to the outlet of the conditioner. - partially filling the conditioner with the product, - rotating a mixer shaft of the conditioner in a first direction of rotation (R') such that at least one paddle, which is arranged on the mixer shaft only in an initial region of the mixer shaft, substantially brings about no conveying of the product in the initial region in a direction parallel to the mixer shaft, wherein the product is held in the initial region of the mixer shaft, and wherein, in a portion of the conditioner that is adjacent to the initial region, other elements are arranged on the mixer shaft that bring about either no conveying or bring about backward conveying of the product, wherein the paddle comprises a planar element with a working surface and a back surface, which element, during intended use, is positioned substantially on a plane perpendicular to an axis of rotation of the mixer shaft and has a fastening means for fastening the paddle to the mixer shaft, wherein the working surface is inclined by a working angle on the one side, and the back surface is inclined by a back angle on the other side of the plane perpendicular to the axis of rotation of the mixer shaft, wherein the back angle is less than the working angle, - rotating the mixer shaft in a second direction of rotation such that the at least one paddle brings about conveying of the product in a direction parallel to the mixer shaft, wherein the product is conveyed through the conditioner via the portion of the conditioner that is adjacent to the initial region to the outlet of the conditioner.