The napkin machine shell-and-tube heat exchanger is also called a tube-and-tube heat exchanger, and the pressure controller is used as a heat transfer tool for the wall of the tube bundle enclosed in the outer casing, and the ink jet printer belongs to a type of partition wall heat exchanger. The shell-and-tube heat exchanger has a simple structure, convenient operation, wide selection of manufacturing materials, and can work under high temperature and high pressure environment. Currently, the most widely used heat exchanger type. The main components of the plate heat exchanger include a housing, a heat transfer tube bundle, a tube sheet, a baffle (baffle), and a tube box. The shell of the plate heat exchanger is mostly designed in a cylindrical shape, and the heat transfer tube bundle is installed in the casing, and is fixed by the tube plate, and the two fluids flow inside and outside the heat transfer tube bundle when the heat transfer is performed. --Fujian mini handkerchief machine