Parchmentizing / SAVUTEC® vulcanized fibre
For parchmentizing, one or several layers of raw paper are pulled through a bath with concentrated sulphuric acid, wrung out and subsequently washed out in several baths with decreasing concentration. The acid ensures that the fbres of the cotton tie together anew. »Hydrate cellulose« forms on the surface. The sulphuric acid serves as a catalyser which is washed out completely (neutral pH factor). Subsequently, the vulcanized fbre Savutec® is cured, rolled up and packaged.