Shuttering of aerosol streams

摘要: Methods and apparatuses for controlling aerosol streams being deposited onto a substrate via pneumatic shuttering. The stream is surrounded focused by an annular co-flowing sheath gas in the print head of apparatus. A boost flows to vacuum pump during printing aerosol. valve adds at appropriate time, portion two gases deflected direction opposite flow least partially prevent from passing through deposition nozzle. Some or all combined with that exhausted head. By precisely balancing into out head, maintaining rates approximately constant, keeping flowing both shuttering, transition time between partial full shuttering minimized. can be mechanical shutter faster operation. pre-sheath used minimize delay center near sides channel.