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Blog | Manufacturing Solutions


Flex Circuit Polyimide Coverlay & Soldermask Considerations

Written by Paul Tome - Product Manager Flex & Rigid Flex
Posted on November 2, 2016 at 3:34 PM

Previously, we gave you the definition for flexible circuit coverlay. Now, we go into greater depth discussing the two primary options for encapsulating the external circuit layers of a flex circuit:  Polyimide Coverlay and Flexible Liquid Photoimageable (LPI) Solder mask. The two materials have very different capabilities and requirements.

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Rigid-Flex PCB Gerber Layout Requirements

Written by Paul Tome - Product Manager Flex & Rigid Flex
Posted on August 16, 2016 at 4:07 PM

Rigid-flex printed circuit boards are unique in terms of integrated construction of both rigid and flex circuit technologies. Unique construction comes with unique requirements that should be reviewed and implemented during the rigid-flex PCB Gerber layout phase of the design process.

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Common Flex & Rigid-Flex PCB Constructions

Written by Paul Tome - Product Manager Flex & Rigid Flex
Posted on May 27, 2016 at 10:30 AM

Flex and rigid-flex PCB constructions have many variations that allow for a wide range of applications and solutions. A significant difference to rigid PCB constructions is that uneven layer counts are allowed and frequently used. The primary reasons being reduced flex thickness, improved flexibility and reduced part cost.

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Flex & Rigid-Flex Bend Capabilities

Written by Paul Tome - Product Manager Flex & Rigid Flex
Posted on February 26, 2016 at 12:12 PM

Essential to any flex or rigid-flex printed circuit board (PCB) contruction is validation that your design will meet your mechanical bend requirements. Minimum flex bend radius requirements were put in place so your design won't exceed the physical capabilities of copper circuitry, which would result in failed parts, long term reliability concerns, and several giant headaches.

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Flex & Rigid-Flex PCB Concept & Mechanical Designs

Written by Paul Tome - Product Manager Flex & Rigid Flex
Posted on November 18, 2015 at 2:30 PM

This blog post is intended to reinforce the design support we offer at Epec for our flex and rigid-flex PCBs. Technical design and engineering is one of our core foundations which allow us to best help our customers meet their product requirements. Within the post, we'll cover design areas that require special consideration.

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Adhesive & Adhesiveless Polyimide Flex Core Material Types

Written by Paul Tome - Product Manager Flex & Rigid Flex
Posted on March 6, 2015 at 1:27 PM

Two distinct types of polyimide flex core material constructions are utilized in today’s flex circuit manufacturing: adhesive based and adhesiveless. The difference, as you can probably tell from the name, is the method used to attach the copper layers to the polyimide core. This creates a unique set of material properties for each of the material types which must be factored into designs to meets all requirements and remain cost effective.

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The Use of Strain Relief with Rigid-Flex Printed Circuit Boards

Written by Chris Perry - Printed Circuit Board Supply Chain Manager
Posted on November 12, 2014 at 10:13 AM

For rigid-flex printed circuit boards (PCBs), the space joining rigid material to flex material (Transition Zone) sometimes contains imperfections that, although acceptable, could impact effectiveness of the final part. Transition zone imperfections can include any of the following:

  • Adhesive squeeze-out
  • Protruding dielectric materials
  • Crazing
  • Haloing
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What Is The Recommended Copper Weight For A Flex PCB?

Written by Paul Tome - Product Manager Flex & Rigid Flex
Posted on July 18, 2014 at 10:05 AM

The copper weight and corresponding thickness used in a flexible circuit board need to be carefully selected in order to meet both the electrical and mechanical bend requirements of specific flex circuit design. Copper weight for a flex PCB is both the stiffest and most critical component.

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What is a Flexible Circuit Coverlay?

Written by Paul Tome - Product Manager Flex & Rigid Flex
Posted on March 14, 2014 at 2:45 PM

In the flexible printed circuit board manufacturing process, a flex circuit coverlay (aka coverfilm) is used to encapsulate and protect the external circuitry of a flexible circuit board.

A flexible circuit coverlay serves the exact same function as solder mask that is used on a rigid printed circuit board. The difference with a flex coverlay is the needed element of flexibility and durability it provides to the flexible circuit board.

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Why You Should Use Flex Circuits in Your Application

Written by Paul Tome - Product Manager Flex & Rigid Flex
Posted on August 13, 2013 at 2:35 PM

Considering using a flexible printed circuit board (flex PCB) in your next project? Flex circuits offer several advantages, whether you plan to use them in a future project or for revamping your existing designs. Here we detail some of the most impactful advantages of flex PCB, including packaging, reliability, capabilities, and cost savings.

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