Chemically modified starches (from potatoes, corn, tapioca, wheat, peas, and others) are used in papermaking, among other applications, to improve paper strength. The wet process is used most frequently in this case. The starch is slurried in water, then the cationizing agent is added to cause it to react. The starch remains in a suspension throughout the entire process until drying. However the drying method is more economical. In this process, natural starch powder is intensively mixed with the cationizing agent. The etherification reaction then takes place in a reactor. The reactor is connected downstream to a second neutralizing mixer. The starch consistency remains powdery throughout the process.
By AVA GmbH u. Co. KG based in Herrsching, GERMANY.
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