Text version of the page

Microdrop Dispenser Heads

ADVANTAGES • Contactless dispensing • Single droplet volumes from 30 pl to 380 pl * • Variation of dispensed volume approx. 1% * • Droplet rate 1 ... 2000 Hz (provided by standard driver electronics) * • Droplet velocity approx. 2 m/s * • Only highly inert materials have contact with the fluid - glass and PTFE (Polytetrafluorethylene) • It is possible to dispense fluids with a room temperature viscosity up to 20 mPas * • Materials, such as waxes, with a viscosity up to 10000 mPas are dispensable if their viscosity is reduced by heating to 20 mPas or lower. Technology Microdrop Dispenser Heads are based on piezo-driven inkjet printing technology. The integrated piezo actuator induces a shock-wave into the fluid contained in the head, which causes a droplet to be emitted from the nozzle. Criteria to find the best Microdrop Dispenser Head • What kind of fluid is to be dispensed (Viscosity, concentration of additives etc.)? • The High Temperature Dispenser Head AD-K-801 can only be driven by the Autodrop System. • What kind of solvent is used? • Are there particles in the liquid: Size and concentration of particles? • The inner nozzle diameter of the Microdrop Dispenser Head strongly influences the droplet size. • Desired diameter of the droplets • The relation between inner nozzle diameter, droplet size and droplet volume is: • Desired droplet emission frequency • Dispensing volume: a) single droplet b) throughput of droplets per second inner nozzle diameterdroplet size in flight *droplet volume *30 μm35 μm20 pl 50 μm55 μm90 pl 70 μm70 μm180 pl100 μm90 μm380 pl • How many dispenser heads are necessary for the application? • Is there an interest to upgrade the system to more than one dispenser head later? • Is an xyz-positioning system required?Need help? Please send us a short description of the application and a datasheet of the fluid.
* depending on the fluid used • The spot size on the substrate depends on the wetting behaviour between the fluid and the surface material. Features • The Microdrop Dispenser Heads MD-K-... can be driven by the Microdrop Driver electronics (MD-E-201-H) or in combination with the Autodrop system (AD-E-...). • microdrop Technologies GmbH are specialized in cus-tomized solutions. Please ask for application-optimized dispenser heads!