Abstract: A method for producing high-purity derivatized starch which to used in the manufacture of paper and cardboard, a starch raw material is subjected to at least the following steps: purification, slurrying, derivatization, gelatinization, pH adjustment, wherein a slurry of the derivatized starch obtained after the slurrying and derivatization method steps carried out in any sequence is subjected to purification, preferably at an alkaline pH and that the purified and gelatinized derivatized starch obtained after gelatinization is mixed at least once with dilute acid as well as application.

Abstract: With a method for digesting starch, an aqueous slurry of the starch is treated with steam in a cooking vessel and in this case exposed to shear forces, wherein the starch-containing slurry is heated to a temperature of between 85?C and 110?C in the cooking vessel by introducing steam, and the digestion step is implemented until the desired degree of digestion has been reached. Also described is a cooking vessel that can be used when the method for digesting starch is being carried out.

Abstract: The invention relates to a process for the manufacture of paper, paperboard and cardboard, wherein spray starch is applied to a moving, wet sheet of material and which is characterized in that the starch is sprayed onto the wet sheet of material in powder form by means of one or more nozzle(s).

Abstract: The invention relates to a process for the manufacture of paper, paperboard and cardboard, wherein spray starch is applied to a moving, wet sheet of material and which is characterized in that the starch is sprayed onto the wet sheet of material in powder form by means of one or more nozzle(s).