What are the categories of paper processing machinery?

  In the aspect of material preparation and pulping, Pete in Germany began to use a cooking pot to cook the old cotton cloth pulping in 1839; in 1843, Keller in Germany invented the wood grinding method to peel off the wood fiber, and it was successfully improved by Friedel in ten years; in 1851, Burgess in England and watt in the United States invented the soda wood pulping; in 1857, Tillman in the United States invented the sulfite wood pulping technology In 1884, German chemist Dahl invented Kraft wood pulping technology. These inventions opened up the way of using wood as the main raw material of papermaking. By the early 20th century, papermaking machinery had become a large and high-yield industrial machinery.