| 摘要 |
<p>1. Process for the production of a plate heat exchanger which contains at least three parallel plate elements consisting of graphite and a fluoropolymer arranged spaced apart, consisting of a plate and a frame surrounding this plate, and with means for the supply and removal of heat exchanging fluids which flow through the plate heat exchanger between respective pairs of plates, characterised in that a) graphite powder with a particle size below 0.5 mm is mixed with a pulverous fluoropolymer with a particle size below 0.001 mm in the ratio 95 : 5 to 70 : 30 at a temperature between 200 and 350 degrees C, b) the mixture is comminuted to a particle size below 0.3 mm after cooling to room temperature and c) the comminuted material is pressed to plate elements at a temperature of at least 200 degrees C with a pressure of at least 200 bar and d) the plate elements are assembled to a heat exchanger and flexible flat seals are arranged between the flat surfaces of neighbouring frames.</p> |
