Inkjet Printing of UV Curable Character Ink and Control of the Dried Droplets Size

2012 ◽  
Vol 463-464 ◽  
pp. 1368-1372
Author(s):  
Jiang Zhong Hang ◽  
Yin Yin Cheng ◽  
Jie Li ◽  
Li Yi Shi ◽  
Mei Hong Zhang
Keyword(s):  
Surface Tension ◽  
Inkjet Printing ◽  
Printed Circuit Board ◽  
Droplet Diameter ◽  
Acrylic Resin ◽  
Circuit Board ◽  
High Dispersion ◽  
Uv Curable ◽  
Printed Circuit ◽  
And Control

In this paper an UV-curable character ink with high dispersion and stability was prepared based on acrylic resin, acrylic monomer, photo-initiator, pigment and other additives. The viscosity, particle size and surface tension of the ink were 18~22mPas, 310~330 nm and 22~25 mNm-1 at 25oC, respectively. These features showed the possibility to inkjet printing the ink on printed circuit board (PCB). Inkjet printing with high resolution can be achieved by varying the dried droplet diameter. Applied voltage and temperature during the jetting process influenced the diameter of dried droplet.

Numerical simulation of EWOD on a printed circuit board for cleanroom-less digital fluidic manufacturing applications

2019 ◽  
Vol 38 (1) ◽  
pp. 119-137 ◽  
Author(s):  
Reza Hadjiaghaie Vafaie ◽  
Hossein Dehganpour ◽  
Abolfazl Moradpour
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Electric Field ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Angle Distribution ◽  
Content Type ◽  
Electrowetting On Dielectric ◽  
Printed Circuit ◽  
Wide Range

Purpose Digital microfluidic devices have been demonstrated to have great potential for a wide range of applications. These devices need expensive photolithography process and clean room facilities, while printed circuit board (PCB) technology provides high configurability and at low cost. This study aims to investigate the mechanism of electrowetting-on-a-dielectric (EWOD) on PCB by solving the multiphysics interaction between fluid droplet and electric field. The performance of system will be improved by inducing an efficient electric field inside the droplet. Design/methodology/approach To induce an electric field inside the droplet on a PCB and change the initial contact angle, the mechanism of EWOD is studied based on energy minimization method and a set of simulations are carried out by considering multiphysics interaction between the fluid droplet and external electric field. The performance of EWOD on a PCB system is investigated using different electrode structures. Findings Surface tension plays an efficient role in smaller sizes and can be used to move and control a fluid droplet on a surface by changing the interfacial surface tension. EWOD on a PCB system is studied. and it revealed that any change in electric field affects the droplet contact angle and as a result droplet deformation and movement. The electrode pattern is an important parameter which could change the electric potential distribution inside the droplet. Array of electrodes with square, zigzag interdigitated and crescent shapes are studied to enhance the EWOD force on a PCB substrate. Based on the results, the radial shape of the crescent electrodes keeps almost the same actuated contact line, applies uniform force on the droplet periphery and prevents the droplet from large deformation. A droplet velocity of 0.6 mm/s is achieved by exciting the crescent electrodes at 315 V. Furthermore, the behavior of system is characterized for process parameters such as actuation voltage, dielectric constant of insulator layer, fluidic material properties and the resultant velocity and contact angle. The study of contact angle distribution and droplet motion revealed that it is helpful to generate EWOD mechanism on a PCB which does not need more complicated fabrication processes. Originality/value The ability to handle and manipulate the droplets is very important for chemistry on-chip analysis such as immunoassay chips. Furthermore, a PCB-based electrowetting-on-dielectric device is of high interest because it does not need cleanroom facilities and avoids additional high-cost fabrication processes. In the present research, the EWOD mechanism is studied on a PCB by using different electrode patterns.

Reducing Material Waste Using Six Sigma in Printed Circuit Board Assembly

2007 ◽  
Author(s):  
Naji E. Gebara ◽  
Badih Jawad
Keyword(s):  
Six Sigma ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Printed Circuit Board Assembly ◽  
Printed Circuit ◽  
Circuit Board Assembly ◽  
Project Controlling ◽  
Key Steps ◽  
The Cost ◽  
And Control

Material waste in the Printed Circuit Board Assembly consist of parts and components that are purchased above and beyond what is required to complete a project. Controlling such material waste identified in this paper as Quantity Variance is in a direct relationship to minimizing the cost of variance that increases the profitability of each job in a low volume high mix production. This Quantity Variance occurs as defects at key steps of the manufacturing process. Six sigma is used to define, measure, analyze and control occurrences resulting in the need to purchase additional components for the completion of the order.

scholarly journals Printed Circuit Board Drilling Machine Using Recyclables

Electronics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 240 ◽  
Author(s):  
Carlos Robles-Algarín ◽  
William Echavez ◽  
Aura Polo
Keyword(s):  
Printed Circuit Board ◽  
Maximum Size ◽  
Transmission Mechanism ◽  
Circuit Board ◽  
Pid Controllers ◽  
Drilling Machine ◽  
Printed Circuit ◽  
Dc Motors ◽  
The Status ◽  
And Control

The implementation of a printed circuit board (PCB) drilling machine using recyclable materials and computer-aided control is presented. A mechanical system using a DC motor for movement on the X and Y axes, and a transmission mechanism by belts, pulleys, and a worm screw was made. For the Z axis, a mechanism based on a worm screw, nuts, and a stepper motor was implemented. The main board has two microcontrollers communicating in a master-slave configuration via a serial protocol. A real-time operating system (OSA) was implemented to optimize the data flow to the computer using the USB protocol, for communication with the slave microcontroller, positioning the Cartesian axes, and control the motors. The slave is responsible for monitoring the status of the encoders and limit switches, as well as the information delivery to the master. A Matlab-based user interface was developed to determine the coordinates of the holes to be drilled by processing a jpg image. This also allows the user to control the DC motors using PWM signals via configurable parameters of PID controllers. The end result is a drilling machine which able to operate both manually and via a computer, for drilling PCBs of a maximum size of 24 × 40 cm.

scholarly journals Current capabilities of prototyping technologies for multilayer printed circuit boards on a 3D printer

2021 ◽  
Vol 9 (4) ◽  
pp. 28-37
Author(s):  
D. S. Vorunichev ◽  
K. Yu. Vorunicheva
Keyword(s):  
3D Printing ◽  
Printed Circuit Boards ◽  
Printed Circuit Board ◽  
Printed Electronics ◽  
Circuit Board ◽  
3D Printer ◽  
Conductive Ink ◽  
Circuit Boards ◽  
Uv Curable ◽  
Printed Circuit

A new direction in 3D printing was investigated – prototyping of single-sided, double-sided and multilayer printed circuit boards. The current capabilities and limitations of 3D printed circuit board printing technology were identified. A comparative analysis of the characteristics of two desktop 3D printers presented in the industry for prototyping radio electronics, as well as the first professional machine DragonFly LDM 2020, which is a mini-factory for prototyping multilayer printed circuit boards, was carried out. The first practical experience of working and printing on DragonFly LDM 2020 supplied to the megalaboratory “3D prototyping and control of multilayer printed circuit boards” of the Institute of Radio Engineering and Telecommunication Systems MIREA – Russian Technological University is presented. The first samples of electronic boards printed on a 3D printer by the method of inkjet printing were obtained. An additive technology for the production of multilayer printed circuit boards is considered: printing with two printheads with conductive and dielectric nano-ink with two curing systems: an infrared sintering system for conductive ink and a UV curing system for dielectric ink. The LDM (Dragonfly Lights-out Digital Manufacturing) production method with the necessary maintenance is presented. The method allows the system to work roundthe-clock with minimal human intervention, significantly increasing the productivity of 3D printing and expanding the possibilities of prototyping. The materials used for 3D printing of multilayer printed circuit boards and their characteristics were investigated: dielectric acrylate nano-ink (Dielectric Ink 1092 – Dielectric UV Curable Acrylates Ink), conducting ink with silver nanoparticles (AgCite™ 90072 Silver Nanoparticle Conductive Ink). The research carried out allows us to compare the technological standards of printed electronics with traditional methods of manufacturing multilayer printed circuit boards for a number of parameters.

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