Low Cost and Simple PMMA Nozzle Fabrication by Laser Cutting and PDMS Curing Bonding
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International Journal of Precision Engineering and Manufacturing https://doi.org/10.1007/s12541-020-00436-3
REGULAR PAPER
Low Cost and Simple PMMA Nozzle Fabrication by Laser Cutting and PDMS Curing Bonding E. Cheng1 · Xue Yang2 · Zhifu Yin2,3 · Wei Hu3 · Lu Li4 Received: 26 March 2020 / Revised: 20 August 2020 / Accepted: 26 October 2020 © Korean Society for Precision Engineering 2020
Abstract Electrohydrodynamic (EHD) printing can rapidly fabricate micro- or nano-scale lines without employment of any mask, which is suitable for small volume production in industrial applications. However, it is required that the nozzles should be disposable since they can easily be blocked by the un-cleaned ink. CO2 laser is an excellent tool for fabrication of microtrenches in most of polymers with low-cost and high-speed. This paper presented a low-cost PMMA (Polymethyl methacrylate) nozzle fabrication method based on laser cutting and PDMS (Polydimethylsiloxane) curing bonding. The influence of thickness on the maximum stress and deformation rate of PMMA substrate was investigated to decrease the deformation of PMMA nozzle after laser cutting. To avoid stress concentration in PMMA nozzle after thermal bonding, PDMS curing bonding method was proposed. The effect of spin-coating speed on PDMS thickness was studied. The O2 plasma conditions were optimized based on contact angle to improve the bonding strength of PMMA nozzle. The EHD printing experiments demonstrated the practicability of proposed nozzle fabrication method. Keywords Electrohydrodynamic printing · Printing nozzle · PMMA · Laser cutting · PDMS curing bonding
1 Introduction In recent years, electrohydrodynamic (EHD) printing, an emerging direct printing method, has attracted much attention due to its high resolution, low-cost, and simple printing procedures. For traditional inkjet printing, the ink drops are squeezed out by the pressure. The diameter of the printed dot is close to the size of the nozzle [1]. While the droplet during EHD printing is pulled out by an external high electric field. E Cheng and Xue Yang have contributed equally. * Zhifu Yin [email protected] 1
School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
2
School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130012, China
3
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
4
Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi’an 710021, China
When the electrostatic force overcomes the surface tension of the ink, the droplet with smaller diameter could be ejected [2]. It is reported that the diameter of printed dot can be 100 times smaller than the inner-diameter of the EHD nozzle [3]. The resolution of EHD printing can be hundreds of nanometer [4, 5]. For this reason, EHD printing is an ideal method to fabrication of low-cost micro-structu
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