Beltecno is a major supplier of plate-type heat exchangers in Japan for a long time. Our PHE (Plate Heat Exchanger) consists of corrugated metal plates with holes to transfer the two heat fluids through. (Can be seen in the below picture where red aero indicates Hot fluid and Blue indicates Cold fluid)
Two pressure plates hold the pressure pack together with tightening bolts. Sealing gaskets sitting at the perimeter of plates, guide the flow of fluid alternatively to each flow channel.