Abstract: A process for the production of lithium carbonate from an aqueous salt solution at least containing lithium ions, chloride ions and calcium ions; the aqueous salt solution with a lithium content of at least 0.005% by weight and a maximum 0.2% by weight is condensed in a first evaporation step at a temperature between 40° C. and 160° C. until a concentrate I with a water content of ?70% by weight and >60% by weight is formed. In a second evaporation step, the concentrate I is evaporated at a temperature between 60° C. and 180° C. until a concentrate II with a water content of ?60% by weight is formed. In a Li concentration step, the lithium content is raised to at least 0.14% by heating the concentrate II to a temperature of at least 60° C. and thus a lithium-rich concentrate III and a residue III are formed.

Abstract: A process for producing an adhesive tape with a stripe-shaped application of the adhesive on a backing material, where the backing web is guided past a dip roll which is in contact with the backing web, the roll rotates in a bath of adhesive, thereby transferring the adhesive to the roll surface, the roll is designed such that after the roll has run through the bath at least one stripe on the roll surface is adhesive-free.