-
- News
- Books
Featured Books
- pcb007 Magazine
Latest Issues
Current IssueThe Sustainability Issue
Sustainability is one of the most widely used terms in business today, especially for electronics and manufacturing but what does it mean to you? We explore the environmental, business, and economic impacts.
The Fabricator’s Guide to IPC APEX EXPO
This issue previews many of the important events taking place at this year's show and highlights some changes and opportunities. So, buckle up. We are counting down to IPC APEX EXPO 2024.
Getting to Know Your Designer
In this issue, we examine how fabs work with their design customers, educating them on the critical elements of fabrication needed to be successful, as well as the many tradeoffs involved. How well do you really know your customer? What makes for a closer, more synchronized working relationship?
- Articles
- Columns
Search Console
- Links
- Events
||| MENU - pcb007 Magazine
Basic Principles of Polymer Thick Film Flexible Circuits
August 7, 2014 | Joe Fjelstad, Verdant ElectronicsEstimated reading time: 1 minute
Polymer thick film (PTF) technologies have been used to manufacture printed circuits for decades. In fact, some of the very first circuits ever produced in volume were made by printing conductive inks patterned on an insulating substrate using a stencil. While the versatile nature of the materials used and the simplicity of the manufacturing process have made possible its continued use for more than six decades. In more recent decades, the technology has seen extensive use in the manufacture of inexpensive, polyester film-based membrane switches for electronic devices of every imaginable type, from hand-held calculators and computer keyboards to household appliances including microwave ovens and washers and dryers and beyond.
Polymer thick film circuits are similar in many ways to their rigid and flexible counterparts; however, because of the materials and processes, they have their own very specific design rules. Because most PTF processing is most commonly based on screen printing technology, the limits of design are intrinsically linked to the printed ink’s processing considerations and limitations. For example, there are the unique processing properties for conductive and resistive as well as insulating inks in terms of their thixotropy, which influence their printability. There is also the important consideration of the final values for the conductivity and/or resistivity of the ink used when cured. In addition, there are also the limits of the screen printing materials and the processes used.
Traditional screen printing methods are typically limited to the production of relatively course features (e.g., 250 µm). However, very fine-featured screen printed circuit technology has been reported down to ranges closer to 125 µm. For the foreseeable future, screen printing will remain an important technology for the manufacture of PTF circuits, both rigid and flexible. That said, inkjet printing is well positioned to augment time honored screen print methods. It also opens the door to realizing the possibility of producing circuits economically at a run unit of one, which has been one of the ideals of manufacturing.
Read the full article here.
Editor's Note: This article originally appeared in the June 2014 issue of The PCB Magazine.
Suggested Items
Accenture Invests in Sanctuary AI to Bring AI-Powered, Humanoid Robotics to Work Alongside Humans
03/27/2024 | BUSINESS WIREAccenture has made a strategic investment, through Accenture Ventures, in Sanctuary AI, a developer of humanoid general-purpose robots that are powered by AI and can perform a wide variety of work tasks quickly, safely and effectively.
AT&S Well Prepared to Benefit from AI Boom
03/26/2024 | AT&SThe rapid progress in the development of artificial intelligence promises to revolutionize all areas of daily life in the coming years. In order to operate such AI systems, an enormous amount of computing power is required, which is provided by a vast network of data centres.
The IMAPS Show: A Conversation with John Andresakis
03/26/2024 | Marcy LaRont, PCB007 MagazineOn the last day of the IMAPS Device Packaging Conference, Marcy LaRont sat down with industry veteran John Andresakis of Quantic Ohmega, who attended the conference this week. Not his first time at this event, he talked about the conference, advanced technology, and trying to get the word out about the advanced packaging substrates solution Quantic is offering.
ACDi Takes Milestone Delivery of the 23,000th Koh Young Machine
03/26/2024 | ACDiAccording to ACDi (American Computer Development, Inc.), “Flexible, reliable, and equipped to keep your project on schedule, is what you need as an electronics manufacturing services partner.”
Insulectro’s Technology Village to Feature 35 Powerchats at IPC APEX EXPO
03/25/2024 | InsulectroInsulectro, the largest distributor of materials for use in the manufacture of PCBs and printed electronics, will present its popular and successful 13.5-minute PowerChats™ during this year’s IPC APEX EXPO at the Anaheim Convention Center, April 9-11, 2024.