Distribution of adhesives and solder paste process starting from the pneumatic components . Whether hand-held dispensing glue gun , desktop systems , or automated workstations , both diaphragm , around the shaft , pin or piston , such dispenser with air under pressure to force material through the spray nozzle on the floor . Heat , humidity, air pressure fluctuations , pollution, compressed air pulse modulation disorder caused by the liquid , there are changes in viscosity , - all these phenomena can be destroyed by the compressed air -driven distributor of continuous quantitative distribution of material capabilities , particularly High-density electronic circuits in the distribution of small amounts of material when required . Although there is still a pneumatic distributor role , but when on the high accuracy and reliability requirements , the distribution of adhesives based on other methods and paste the distributor was pressed into service. In particular, Fishman produced AirFree ™ LDS9000 type , which uses a unique drive system , can play a strong performance from other types of distributor market constraints .