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Stiffeners are most commonly manufactured from either FR4 or polyimide.
FR4 is cost effective and typically used to support component areas, due to its higher rigidity than polyimide. Thicknesses vary from 0.008” to 0.059” or greater.
Polyimide is used for increasing the thickness at, and providing support for, ZIF connector contact fingers. It allows for the tight tolerance of the flex thickness and part outline at the contacts as called out by the connector specifications. Typically, at the finger area, flex thickness tolerance is +/- 0.002” and outline width is +/- 0.003”. Polyimide is also used to limit bend capabilities in specific areas to facilitate installation in the final assembly, reinforce mounting hole locations and provide added wear resistance if there is an abrasion concern.
Stiffeners can also be manufactured from aluminum or stainless steel as well as other materials. Aluminum is commonly used for designs that require heat dissipation. Stainless steel is used when the design has space limitations on the stiffener thickness and a higher level of support is required than what an FR4 stiffener of the same thickness can provide. Both materials are added cost factors, can extend delivery times, and may have minimum order quantity requirements.
Materials: Rigid-Flex PCB
Rigid-flex circuit boards utilize the same materials as rigid PCBs
and flex circuits but differ in the type of pre-preg used. The
pre-preg required has a reduced flow capability and is referred to
as either “no-flow” or “low- flow”. It is the same material as
standard full flow pre-preg but is cured to a higher level prior to
use in lamination. This increased cure state prevents the pre-preg
from being extruded out between layers and onto the surface of the
interconnecting flex sections. If allowed to occur, this would
violate IPC-6013 specifications and result in a finished part that
is non-functional or that is easily broken when bent. The necessary
low-flow format of the pre-preg is not available in all types of
rigid materials. It’s reduced flow characteristics also require a
thicker amount to ensure a proper lamination.
YS Rigid Flex PCB manufacturing capabilities overview
Feature | capabilities | |
Layer Count | 2-20L | |
Rigid-Flex Thickness | 0.3mm-5.0mm | |
PCB thickness in flex section | 0.08-0.8mm | |
copper Thickness | 1/4OZ-10OZ | |
Minimum line Width and Space | 0.05mm/0.05mm(2mil/2mil) | |
Stiffeners | Stainless steel,PI, FR4 etc. | |
Material | Polyimide Flex+FR4,RA copper, HTE copper, polyimide, adhesive,Bondply | |
Min mechanical Drilled Size | 0.15mm(6mil) | |
Min laser Holes Size: | 0.075mm(3mil) | |
Surface Finish | Suitable Microwave/RF PCB urface finishes: Electroless Nickel, Immersion Gold, ENEPIG, Lead free HASL,Immersion Silver.etc. | |
Solder Mask | Green, Red, Yellow, Blue, White, Black, Purple, Matte Black, Matte green.etc. | |
Covrelay (Flex Part) | Yellow Coverlay, WhiteCoverlay,Black Coverlay |
layer/m² | S<1㎡ | S<3㎡ | S<6㎡ | S<10㎡ | S<13㎡ | S<16㎡ | S<20㎡ | S<30㎡ | S<40㎡ | S<50㎡ | S<65㎡ | S<85㎡ | S<100㎡ |
1L | 4wds | 6wds | 7wds | 7wds | 9wds | 9wds | 10wds | 10wds | 10wds | 12wds | 14wds | 15wds | 16wds |
2L | 4wds | 6wds | 9wds | 9wds | 11wds | 12wds | 13wds | 13wds | 15wds | 15wds | 15wds | 15wds | 18wds |
4L | 6wds | 8wds | 12wds | 12wds | 14wds | 14wds | 14wds | 14wds | 15wds | 20wds | 25wds | 25wds | 28wds |
6L | 7wds | 9wds | 13wds | 13wds | 17wds | 18wds | 20wds | 22wds | 24wds | 25wds | 26wds | 28wds | 30wds |
8L | 9wds | 12wds | 15wds | 18wds | 20wds | 20wds | 22wds | 24wds | 26wds | 27wds | 28wds | 30wds | 30wds |
10L | 10wds | 13wds | 17wds | 18wds | 20wds | 20wds | 22wds | 24wds | 26wds | 27wds | 28wds | 30wds | 30wds |
12L | 10wds | 15wds | 17wds | 18wds | 20wds | 20wds | 22wds | 24wds | 26wds | 27wds | 28wds | 30wds | 30wds |
14L | 10wds | 16wds | 17wds | 18wds | 20wds | 20wds | 22wds | 24wds | 26wds | 27wds | 28wds | 30wds | 30wds |
16L | 10wds | 16wds | 17wds | 18wds | 20wds | 20wds | 22wds | 24wds | 26wds | 27wds | 28wds | 30wds | 30wds |
FQA
1. What are the minimum and maximum thickness of your adhesive flex
PCBs?
Minimum thickness is 2 µm and the maximum is 200 µm.
We ensure high chemical durability and processing compatibility for
flexible printed circuits and do not sacrifice its original
electrical property, heat-resistant property, and mechanical
property.
2. Which IPC standards do you follow?
IPC Standards for Rigid and Flexible PCBs
The list of IPC standards below applies to rigid PCBs and flex
circuits. Take note that this list is not exhaustive, and
additional IPC standards may need to be considered.
You should consult the ipc.org website for a full list of available
IPC standards.
IPC-2221A, Generic Standard on Printed Board Design
IPC-2223, Sectional Design Standard for Flexible Printed Boards
IPC-4101, Specification for Base Materials for Rigid and Multilayer
Printed Boards
IPC-4202, Flexible Base Dielectrics for Use in Flexible Printed
Circuitry
IPC-4203, Adhesive Coated Dielectric Films for Use as Cover Sheets
for Flexible Printed Circuitry and Flexible Adhesive Bonding Films
IPC-4204, Flexible Metal-Clad Dielectrics for Use in Fabrication of
Flexible Printed CircuitryIPC-6013, Qualification and Performance
Specification for Flexible Printed Wiring
3. What is the function of the flexible circuit board?
The functions of flexible circuit boards can be divided into four
types: Lead Line, Printed Circuit, Connector, and Integration of
Function.
The use covers computers and computer peripherals—auxiliary
systems, consumer electrical appliances, automobiles, etc.
After the circuit is completed with single-sided PI copper-clad
material, it is covered with a protective film to form a flexible
circuit board with only a single-layer conductor.
4. Rigid-flex PCB vs. rigid PCBs and flexible PCB, What are the
differences?
As the name suggests, rigid-flex PCB is a mixture of rigid and
flexible PCBs.
Rigid-flex PCBs combine the excellent qualities of both while
eliminating many of their limitations.
Rigid-flex PCBs combine flex circuit design with rigid materials.
By layering the flexible PCB board inside the rigid printed circuit
board material, the versatility of the flexible printed circuit is
finally combined with the stability, strength, and circuit wiring
density of the rigid printed circuit board.
This mixing opens possibilities for more complex and mechanically
challenging rigid-flex PCB designs.
Rigid-flex PCB simplifies the electronic design by eliminating
flexible cables, connectors, and discrete wiring.
Its electrical performance has been enhanced compared to its
counterparts because the circuit is an integral part of the overall
structure.
All electrical and mechanical connections are contained in the
rigid-flex PCB, providing electronic designers with greatly
improved service reliability and electrical performance.
Although the cost of rigid-flex PCBs is usually higher than
flexible PCBs and rigid PCBs.
However, rigid-flex PCBs’ reliability, weight reduction, strength,
and space-saving advantages are generally ideal in specific
applications and are superior to any other electronic packaging
technology.
Ultimately, rigid-flex PCB provides the best benefits of rigid PCBs
and flexible PCBs in one solution.
5. How you work with YScircuit?
Step 1: Place your order and our enginner will review the Gerber
and comforming you with the EQ, and then, the production will
start.
Step 2: Quality check and arrange the shipping by courier.