Mixing kneader for processing a transfer mixture into a molding solution according to a direct dissolution method, comprising a feed, a housing and a discharge, wherein the feed introduces a product consisting essentially of cellulose, water and a functional liquid into the housing, wherein a kneader shaft situated in the housing rotationally mixes and kneads the product and wipes it over heated inner surfaces of the mixing kneader, wherein the amount of undissolved particles in the product and the size of the particles are reduced and some of the water evaporates to form a molding solution,
- wherein
- the process volume of the mixing kneader is determined only by the requirements of a molding solution flow capacity.