PCB –Printed Circuit Board made of carbon, is utilized for mechanically supporting and electrically connecting the electronic parts utilizing conductive pathways, signal traces or tracks etched via copper sheets that were laminated on an insulating substrate.
Carbon ink PCB mainly refers to use of silkscreen technology, carbon ink is printed in the designated location, after the oven curing test to form qualified carbon film with a certain resistance value to replace the original resistive element.
Carbon coated board ( Carbon PCB) is mainly used in TV remote control circuit board, telephone circuit board, children's toy circuit board, computer carbon ink board. Carbon ink printing process is an environmental protection process, which will not pollute the air, water, and soil.
If copper traces are the functional units of the carbon PCB – the carbon ink PCB, that acts as a basic structure, then the parts are integral organs. Each element has a different role to play. These components making the PCB give some specific qualities that make it appropriate for the specified purpose. Depending on the type of item or device the Printed Circuit Board is designed for, other components are required for these carbon circuits. The elements might constitute of several electronic parts. Some of the essential carbon components include:
The resistors are responsible for controlling the electric current and providing resistance to the carbon ink PCB when it passes through them. Specific color codes are present that determine the value of the resistors.
The simplest types of PCB, like Carbon Ink PCB in PCB fabrication, consist of one layer and single-sided carbon boards. However, copper or gold traces might also be present on all board sides that creates a double-sided Printed Circuit Board. These get even more complicated as there is an addition of additional layers to the already current design.
The new layers have all formations of traces on the Carbon Ink PCB. The copper or gold ink ages are not able to cross each other unless there is some compromise made on the electrical charge. As a result, multi-layered PCB becomes mandatory for electronics on advanced levels. However, one side is reversed in the single-sided boards for tracing, while the other side contains all the components.
A solder mask and silkscreen is supported on the layer. The solder mask has a function to make the carbon PCBs more prominent with a green color. It is used for the insulation of copper from any of the metal parts that may come in contact with the mask in manufacturing.
On the other hand, some parts of the metal stay exposed for joining purposes. A silkscreen is present over the top of the solder mask having different letters, and specific numbers etched on it. This makes the assembling of the PCBs much convenient for the engineer in the service.
These are only the basic features and functions of the carbon ink PCB described in short, and it gets more complicated with the addition of advanced electronics provided by the supplier of the company. However, the basic principle is universal for all carbon PCBs, even if the manufacturer through the use of technology went for 16 layers on the boards of the PCB.
1.PCBONLINE have two automatic single panel production lines, which are all completed by the machine from the beginning of material opening to the completion of silkscreen printing, without personnel intervention.
3.f it is the high resistance carbon ink board, PCBONLINE will use the carbon ink resistance calculation formula: R=ρL/WT X 1.2 (ρ: carbon ink square resistance, L: carbon ink length, W: carbon ink width T: carbon ink thickness) to calculate the corresponding resistance value, then choose the relative carbon ink material when we printed carbon PCB, for example:
A.All the board with single side carbon ink, resistance≥250Ω,PCBONLINE will use CCI-301D
B.All the board with double side carbon ink, resistance≥250Ω,PCBONLINE will use T-30PL-30
C.All the boards with carbon ink, resistance＜250Ω, PCBONLINE will use CCI-301F
4.PCBONLINE has very strict control in carbon ink process, such as immersion silver or immersion boards can not be produced with carbon ink, because if you print carbon ink after immersion silver or immersion tin, it will contaminate the surface of PADs. if you print the carbon ink first and then immersion silver or immersion tin, the silver and tin will adhere to the surface of the carbon ink. So engineers in PCBONLINE will review the Gerber after receiving the order from customers, if there is a carbon ink + immersion silver or tin, we will suggest the customer change to carbon ink+ immersion gold.