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Special Section: Micromanufacturing

Gap Adjustable Molten Metal DoD Inkjet System With Cone-Shaped Piston Head

[+] Author and Article Information
Taik-Min Lee1

 Korea Institute of Machinery & Materials, Daejeon 305-343, Koreataikmin@kimm.re.kr

Tae Goo Kang2

 Korea Institute of Machinery & Materials, Daejeon 305-343, Korea

Jeong Soon Yang3

 Korea Institute of Machinery & Materials, Daejeon 305-343, Korea

Jeongdai Jo, Kwang-Young Kim, Byung-Oh Choi, Dong-Soo Kim

 Korea Institute of Machinery & Materials, Daejeon 305-343, Korea

1

Corresponding author.

2

Present address: Bioelectronics Program, Institute of Microelectronics, Singapore.

3

Present address: System Convergence Division, Turbo Co., Ltd., Korea.

J. Manuf. Sci. Eng 130(3), 031113 (May 16, 2008) (6 pages) doi:10.1115/1.2917367 History: Received September 25, 2007; Revised February 15, 2008; Published May 16, 2008

In this paper, we present the design, fabrication, and performance test of a gap adjustable molten metal drop-on-demand (DoD) inkjet system with a cone-shaped piston head, which can eject a droplet of lead-free molten solder at high temperature. The gap adjustable mechanism with the cone-shaped piston head is proposed for optimizing the gap distance between the chamber wall and piston head. The droplet diameter and velocity can be controlled in a wide range by moving the initial gap distance and minutely by controlling the chamber pressure. Stability and satellite can be partly adjusted by controlling the initial gap distance and the chamber pressure, respectively. The working temperature is improved by locating the piezoelectric actuator at the outside of the furnace and by inserting the insulation block between the print head and the actuator. From a practical point of view, the molten metal DoD inkjet system presents a simple structure for easily interchangeable nozzle parts, even though the nozzle is choked. The gap adjustable molten metal DoD inkjet system with cone-shaped piston head has great potential as a manufacturing tool for direct printing a viscous material at various temperatures. It is expected to be applicable in many industrial fields including semiconductor packaging, electrode bonding, printed electronics, information, and display industry.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Working principle of a molten metal DoD inkjet system

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Figure 2

Schematic jetting diagram after 1cycle in nonoptimal condition: (a) in the case of the wide gap between piston and cylinder wall; (b) in the case of the small gap between piston and cylinder wall

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Figure 3

Conceptual view of the gap adjustable molten metal DoD inkjet head with cone-shaped piston

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Figure 4

3D model for the gap adjustable molten metal DoD inkjet system with cone-shaped piston head

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Figure 5

Prototype of the gap adjustable molten metal DoD inkjet system with cone-shaped piston head: (a) the gap adjustable molten metal DoD inkjet system; (b) experimental setup

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Figure 11

Block diagram of the operation step for the gap adjustable molten metal DoD inkjet system

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Figure 10

Experimental results of the effects of the operating parameters on the diameter and velocity of the inkjet system: (a) effects of the initial gap distance; (b) effects of the chamber static pressure

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Figure 9

Captured trajectory of the ejected molten metal droplets (droplet diameter 290μm)

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Figure 8

Captured trajectory of the ejected pure water droplets (droplet diameter 170μm)

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Figure 7

Measured viscosity of the molten metal versus shear rates

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Figure 6

Piston head and nozzle part (cone diameter 6mm, cone angle 45deg, nozzle diameter 100μm, nozzle depth 50μm): (a) three-dimensional model; (b) fabricated nozzle head; (c) nozzle hole

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