Effect of Enhanced Squeezing Needle Structure on the Jetting Performance of a Piezostack-Driven Dispenser

Huang, Xiang; Lin, Xiaochen; Jin, Hailin; Lin, Siying; Bu, Zhenxiang; He, Gonghan; Sun, Di; Wang, Lingyun

doi:10.3390/mi10120850

Cited by 11 publications

(4 citation statements)

References 25 publications

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“…In the dispensing process, the flow velocity of glue and the size of glue droplets are the two main parameters to measure the dispensing quality. The faster flow velocity of droplets can attach more precisely, and smaller droplets can meet the requirements of micro-scale dispensing (Huang et al, 2019). The dispensing process of the piezoelectric jetting valve is essentially a process in which the flow state of the glue changes under the action of the needle and nozzle.…”

Section: Simulation Analysis Of Dispensing Processmentioning

confidence: 99%

Design and performance analysis of a piezoelectric jetting dispensing valve

Shi,

Huang,

2024

Journal of Intelligent Material Systems and Structures

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In order to meet the requirements of high frequency, high precision, and micro-scale dispensing in the field of microelectronics packaging, a piezoelectric jetting dispensing valve based on two-stage displacement amplifying mechanism was proposed. First, the overall structure and working principle of the proposed piezoelectric jetting valve were described. The displacement amplifying mechanism was designed, and the mathematical relationship between the output displacement and the structural parameters was established. In addition, the performance and the structural size of the displacement amplifying mechanism were analyzed and optimized by using the finite element analysis software. The influences of driving pressure, glue viscosity, needle displacement, and other parameters on droplet diameter and jetting velocity in the process of dispensing were simulated and analyzed. In order to obtain the optimal nozzle structure, the changing curves of glue flowing velocity with different nozzle seal forms, nozzle cone angles, and outlet inner diameters were compared and analyzed. Finally, the prototype of the piezoelectric jetting dispensing valve was machined, and experimental study was performed. The influence laws of driving pressure, glue viscosity, driving voltage, and other parameters on the diameter of droplet were explored. The performance of the prototype was evaluated from three aspects of dispensing frequency, consistency, and minimum dispensing droplet diameter. Results show that the highest dispensing frequency is 230 Hz, the deviation of dispensing consistency is ±8.77%, and the minimum dispensing droplet diameter is 0.54 mm. The experimental results verify the high frequency, consistency, and micro-scale dispensing performance of the piezoelectric jetting dispensing valve based on the displacement amplifying mechanism, which provides a reference for the research of piezoelectric high-frequency jetting dispensing.

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Section: Simulation Analysis Of Dispensing Processmentioning

confidence: 99%

Design and performance analysis of a piezoelectric jetting dispensing valve

Shi,

Huang,

2024

Journal of Intelligent Material Systems and Structures

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“…Furthermore, the jetting performance can be enhanced by changing the needle shape. For example, the jetting velocity was increased by adding a side cap [104] and pin joint [105] to the needle.…”

Section: Needle-based Printingmentioning

confidence: 99%

Classifications and Applications of Inkjet Printing Technology: A Review

et al. 2021

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Inkjet printing technology uses the low-cost direct deposition manufacturing technique for printing and is applicable in various fields including optics, ceramics, three-dimensional printing in biomedicine, and conductive circuitry. This study reviews the classifications and applications of inkjet printing technologies, with a focus on recent publications. The different design approaches, applications, and research progress of several inkjet printing techniques are reviewed. Among them, the piezoelectric inkjet printing technology is the main focus owing to its reliability and handling of a diverse range of inks. A piezo-driven inkjet printhead is activated by applying a voltage waveform to a piezoelectric membrane. The waveform ensures the formation of the designed droplet and a stable jet. A survey of various drivingvoltage waveforms is conducted, which can serve as a reference to the research community that uses piezodriven inkjet printheads. The challenges of printing quality, stability, and speed and their solutions as published in recent studies are reviewed. Technologies for producing high-viscosity inkjets are explored, and the applications of inkjet printing technology in textile, displays, and wearable devices are discussed.

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“…For this reason, Deng et al [15] designed a pin joint to coordinate radial motion. However, the elastic rotating pair of the compliant mechanism was easily fatigued, which would affect the repeatability of elastic deformation, and even lead to the failure of the jetting operation, such as jet-flow [16] and satellite drops [17,18].…”

Section: Introductionmentioning

confidence: 99%

Design and experiment of a new double needle type piezoelectric jetting dispenser

Zhao

Siyuan²,

Chen³

et al. 2023

Smart Mater. Struct.

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To improve the performance of piezoelectric jetting dispensers in the electronic packaging industry and address the problems of oversized, easily fatigued elastic hinges and low repetition accuracy of conventional piezoelectric jetting dispensers with a compliant mechanism-based lever, a new double needle piezoelectric jetting dispenser prototype was developed. The advantage of the proposed structure over compliant mechanism-based lever was demonstrated by dynamics analysis. Firstly, the design stroke of the needle and the modal state of the dispenser body were analyzed using ANSYS. Secondly, the theoretical model of adhesive injection was established, the fluid pressure change process inside the nozzle during the working cycle of the jetting dispenser was simulated using Fluent, and the effects of the supply pressure and needle stroke on the injection speed of the droplet were investigated. Finally, a test bench was built to conduct the experiment, and the results showed that the supply pressure and the driving signal duty cycle between 20–80% were positively correlated with the size of droplet diameter, whereas the driving signal frequency was negatively correlated with the droplet diameter, thereby validating the proposed adhesive injection model. Under the experimental conditions, the highest operating frequency of the designed piezoelectric jetting dispenser was 400 Hz, which is close to the high-frequency level of existing studies, and the minimum droplet diameter obtained was 0.36 mm, which is 0.1–0.2 mm less than that of the existing piezoelectric jetting dispenser with a compliant mechanism drive, meeting the industry requirements for the working performance of a piezoelectric jetting dispenser.

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Effect of Enhanced Squeezing Needle Structure on the Jetting Performance of a Piezostack-Driven Dispenser

Cited by 11 publications

References 25 publications

Design and performance analysis of a piezoelectric jetting dispensing valve

Design and performance analysis of a piezoelectric jetting dispensing valve

Classifications and Applications of Inkjet Printing Technology: A Review

Design and experiment of a new double needle type piezoelectric jetting dispenser

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