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MicroFab Technologies Inc
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M I C R O D I S P E N S I N G S E T U P, General Notice. The information contained in this document is subject to change without notice. MicroFab makes no warranty of any kind with regard to this material including but not limited to the implied warranties. of merchantability and fitness for a particular purpose MicroFab shall not be liable for errors contained herein or for. incidental or consequential damages in connection with the furnishing performance or use of this material. Regarding Dispensing Device s, All dispensing devices are tested at MicroFab Test waveforms are established for IPA and DI Water If. your dispenser does not function as expected repeat these test conditions as described in the form. included with each dispensing device If the device does not dispense IPA or DI Water with the test. waveforms please contact MicroFab, Cleaning procedures for MicroFab s dispensers can be found on the website at www microfab com. There is no hardware associated with this document. Limitation of Warranty, There is no hardware associated with this document. General Safety Considerations, Warning The jetting device itself presents no general chemical hazard However when fluids.
are selected to be dispensed by the operator appropriate safety measures should be. followed as outlined in the selected material s MSDS. Warning Ink jet dispensing with piezoelectric actuation requires an electrical signal Standard. safety procedures should be followed for the electrical connections Before. connecting disconnecting the dispenser to the signal generator make sure that no. electrical signal is produced, 11 07 2012 1, M I C R O D I S P E N S I N G S E T U P. Introduction, This document is intended as a primer for first time users of ink jet dispensing technology It is. written with the assumption that at least the ink jet dispensers are purchased from MicroFab. Technologies The document discusses the needs of the low temperature dispensers and several. approaches to fulfill them The high temperature devices are only sold with their associated. printhead and are not discussed here, The set up concentrates on drop on demand DOD operation even though a set up as described. later on could be used for continuous ink jet In continuous ink jet processes drops are generated. all the time and the ones that are used are selected from the stream of droplets Drop on demand. ink jet can generate any desired number of drops down to a single drop whenever they are needed. and thus provides better control, A separate document describes in more detail the basics of drop generation approaches in. identifying appropriate operational conditions and troubleshooting. Components of a basic ink jet dispensing set up, To Device leads.
monitor actuation, Drive strobe, electronics Ink jet. microdispenser, Figure 2 Detail of the area around the ink jet. Figure 1 Components of ink jet dispensing set up microdispenser. The main components of a basic set up for ink jet dispensing are. 1 Ink jet microdispenser or micro jet piezoelectrically actuated droplet generator. 2 Fluidics tubing connectors and reservoir Feeds the liquid to be dispensed from the reservoir. to the dispenser, 3 Drive electronics The ink jet microdispensers discussed here employ a piezoelectric actuator. to transmit the energy required by the drop generation The drive electronics generate the. electrical signal pulse required to generate a drop. 4 Backpressure control purging Controls the pressure in the space above the liquid in the. reservoir to a level that maintains the liquid flush with the orifice By applying pressure to the. reservoir the solution is purged through the orifice The purge is used to fill up the tubing. 11 07 2012 2, M I C R O D I S P E N S I N G S E T U P. after filling up the reservoir and to eliminate air bubbles and contamination smaller than the. 5 Observation camera video monitor Allows the visualization of the drop formation together. with a LED that is turned on synchronously with the drop generation. 6 Mechanical mounting Mounts the various components and aligns them with respect to each. In some implementations the reservoir fluid connections to the dispenser are all mounted into a. subassembly which is referred to as a printhead MicroFab offers several versions of printheads that. account for various needs minimization of the volume of the dispensed liquid providing sufficient. liquid for longer runs inline filtering heating stirring of the dispensed liquid More details can be. found under Products Printhead Assemblies on MicroFab s web site. Construction categories and part numbers, The dispensers manufactured by MicroFab are actuated piezoelectrically An annular piezoelectric.
PZT element poled radially is bonded to a glass tube with an integrated nozzle and orifice The. glass tube is mounted in a protective housing and at the supply end bonded to a fitting. Orifice Glass tube Fluid fitting, Piezoelectric Inner electrode. Outer electrode material with wrap around, Figure 3 Schematic of MicroFab s glass dispensers. The annular actuator has electrodes on the outer and on the inner. surfaces The inner electrode wraps around on the outer surface for. easier electrical connection a small region on the outer surface has. the metallization removed to separate the two electrodes Figure 3. Small gauge wires are soldered to the outer electrode and the wrap. around portion of the inner electrode the wires are loosely twisted. and placed together in a connecter that matches the output cable of. MicroFab s JetDriveTM electronics box, The configuration of the dispensers or micro jets MJ is differentiated. first by the type of fitting AB barbed or slip on AT threaded. Minstac connection small compression fitting by the Lee Company. ABL barbed large AL Luer fitting The AB and AT devices cab be Figure 4 MJ AB type device with. wires and connector, manufactured with a protective feature ABP and ATP respectively. More details on the various constructions can be found at. Products Microdispensing Devices Low Temp Devices on MicroFab s web site. 11 07 2012 3, M I C R O D I S P E N S I N G S E T U P.
An example of the numbering for such a micro dispenser or micro jet is MJ ATP xxx where the xxx is. the orifice diameter in micrometers The standard range of orifice diameter is 20 80 m for all devices. except ABL devices where the range is extended up to 120 m The part number MJ ABP 075 refers. to a micro dispenser with a barbed fluid connector protected tip and an orifice with a 75 m. Principle of operation, When applying a voltage differential the electrical field is Voltage. generated between the inner and outer electrodes causing the V. piezoelectric actuator to expand radially and contract axially or. depending on the voltage polarity and poling contract radially. and expand axially The deformation occurs only along the. portion where both electrodes are present as the electric field is Time. not generated in the region without electrodes and the wrap 0. around region of the inner electrode trise tdwell tfall. Figure 5 Simplest actuating voltage to, The simplest actuation signal consists of a trapezoidal waveform generate a drop. that is applied whenever a drop is desired to one electrode. while the other electrode is electrically grounded Figure 5. Deformation occurs during the transition periods rise and fall and ceases during the constant. voltage dwell period, In MicroFab s configuration the inner electrode is grounded blue wire while the outer electrode red. wire receives the actuation voltage, During the rise time the tubular PZT expands its circumference while becoming thinner and shorter. This fast deformation is transmitted through the epoxy bond to the glass tube and results in an. outwards motion of the inner glass surface which produces a negative pressure with respect to the. equilibrium The negative pressure travels in the fluid at the speed of sound along the glass tube in. the form of an expansion acoustic wave to both the orifice and the supply end The expansion wave. is reflected as a compression wave higher pressure than the equilibrium pressure in the glass tube. at the supply end and travels back towards the orifice If the dwell time is selected to start when the. positive pressure wave matches the piezoelectric actuator the inwards motion of the inner glass. surface reinforces it resulting in a faster and larger droplet. Figure 6 shows the sequence of, events at the orifice leading to the.
droplet formation starting with the, equilibrium condition fluid flush at. the orifice first image In the, second image the fluid interface. is withdrawn from the equilibrium, position indicating the arrival of Figure 6 Drop ejection sequence of an organic solvent at 640Hz. the expansion wave at the orifice, The third image is after the compression wave reaches the orifice causing the fluid to emerge. Another expansion wave reaching the orifice causes the fluid to pull back images four and five and. to break off and leave the orifice image six The ejected fluid is pulled in a spherical drop by surface. tension forces image seven, 11 07 2012 4, M I C R O D I S P E N S I N G S E T U P.
The images are obtained by a short pulse of light from an LED that is synchronized with the pulse. generating the drop By adjusting the delay between the actuation pulse and the pulse applied to the. LED the droplets are captured at different locations along the flight path. Requirements for operation and observation, Proper operation requires that when the dispenser is not actuated the fluid is flush with the. orifice Figure 6 left image If the forces acting on the fluid at the orifice are not balanced. the fluid will either drip or withdraw in the nozzle Both conditions result in a drop generation. failure The Backpressure control section below discusses two possible methods to maintain. the fluid flush with the orifice, The operation is based on acoustics and wave propagation The length scales and the speed of. sound values result in timing in the tens of microseconds Thus the drive electronics should. allow the adjustment of the timing in one microsecond increments or less. Observation of the drop formation is very important especially when developing new solution. formulations The cameras the LED and its driver are required to observe the droplets To. ensure sharp images the pulse applied to the LED for illumination has to be very short 4 6 s. and at the same time provide sufficient light at low frequencies. If using one of MicroFab s integrated printheads the specific implementation takes care of the. reservoir and connection of the reservoir to the microdispensing device This section only applies if. the microdispenser was purchased separately and the user is setting it up on his own. Tubing and connecting to the device, The MINSTAC fitted MicroJet devices have a male threaded end fitting that can be attached to tubing. and fittings available from The Lee Company www theleeco com. A 062 MINSTAC Tubing Union Part, TMUA3201950Z can be used to. interface the MINSTAC fitting on the, MicroJet device with a MINSTAC.
Male Coupling Screw attached to, Teflon tubing as shown in the top. image of Figure 7 Stocked pre Figure 7 MJ AT type device with a. MINSTAC coupler Top MINSTAC, assembled tube sets having 062 couple male to male using a. MINSTAC Male Coupling Screw on union Bottom MINSTAC coupler. both ends of Teflon tubing 0 062 male to Luer using an adapter. Figure 8 MJ AB barb fitted device, OD are available TUTC3216910L Top CFLEX tubing slipped over. 10 cm TUTC3216915L 15 cm TUTC3216930L 30 cm barb Bottom PTFE tubing slipped. TUTC3216960L 60 cm into CFLEX tubing slipped over barb. The 062 MINSTAC Fitting End Kit Part TMZA3202010Z can be. used to attach the male fittings to Teflon tubing in order to obtain custom lengths Additional Teflon. tubing can be ordered from Lee TUTA3216930D 10 feet. Another option is to interface the MINSTAC fitting on the MicroJet device using the 125 156 MINSTAC. Female Tube Luer Adapter TMRA9502950Z with the 125 156 MINSTAC to 062 MINSTAC Adapter. TMDA3203950Z to connect to male Luer fittings as shown in the bottom of the Figure 7. 11 07 2012 5, M I C R O D I S P E N S I N G S E T U P. The barb fitting of MJ AB MicroJet devices can be attached directly to. C Flex tubing as shown in the top device in Figure 8 Another option is. to slip the PTFE microbore tubing 0 022 x 0 042 in 0 55x1 mm E. 06417 21 Cole Parmer into a small section 6 0mm of C Flex tubing. 0 031 x 0 094 in 0 7x2 3 mm E 06422 01 Cole Parmer that has. been slipped over the barb fitting on the device as shown in bottom. device in Figure 8, The C Flex tubing or PTFE microbore tubing can then be connected to.
the syringe barrel adapter described below by inserting the metal. needle end of a female Luer fitted blunt needle into the C Flex tubing. 18 gauge needle part 7018122 or PTFE microbore tubing 22. gauge needle part 7018272 from Nordson EFD Figure 9 Left Syringe barrel. reservoir Right Syringe barrel, http www nordson com adapter. The approach illustrated at the bottom of Figure 8 allows the use of. higher resistance materials For that configuration use TYGON Ultra Chemical Resistant Tubing. EW 95630 00 Cole Parmer and then the same PTFE tubing described above. The simplest reservoir is a syringe A syringe barrel adapter . MICRODISPENSING SET UP 11 07 2012 2 Introduction This document is intended as a primer for first time users of ink jet dispensing technology

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