The Carbon Ink PCB is made of carbon paste screen hole filling process. Carbon particles are evenly distributed in thermoplastic resin to make conductive ink, and then covered with soldermask. Its toughness is high, its thickness is thin, its insulation is good, and its price is lower than that of gold plating. It is often used in high voltage, pulse and high frequency circuits.
The most common methods of making circuits on printed circuit boards are subtractive method and additive process method. Additive process uses electroless copper or electroplated copper to generate circuits, and making conductive Carbon Ink PCB is also a kind of additive process. Conductive carbon ink is used to make wires, which are printed on insulators. With this method, it is easy and effective to make conductive Carbon Ink PCB with various shapes for printing.
The production process of Carbon Ink PCB is a combination of subtractive method and additive process's PCB board manufacturing method. At present, conductive Carbon Ink PCB have made breakthrough progress in application fields, especially in electronic products with low electric power. As a permanent conductive coating on conductive Carbon Ink PCB, conductive Carbon Ink PCB have been adopted and popularized by many electronic designers.

With the rapid development of electronic industry, conductive Carbon Ink PCB are gradually adopted in common electrical appliances and instruments, which tend to be multifunctional and miniaturized. Such as television, telephone, electronic organ, game machine and video recorder. Its new technology and new functions are constantly being developed and utilized, and the electronic fields such as computer keyboards, card calculators, mini-recorders, electronic measuring devices and SMT are also beginning to choose conductive carbon Carbon Ink PCB, thus enhancing its reputation and expanding its demand.
The conductive Carbon Ink PCB adopts a simple screen printing process, and one or two layers of conductive carbon ink patterns are added on a single-sided printed circuit board to realize high-density wiring. The printed conductive patterns are used as resistors, key switch contacts and electromagnetic shielding layers, etc., which adapts to the development trend of miniaturization, light weight and multifunction of electronic products.
Conductive ink has a wide range of applications, and is the first choice of most electronic enterprises: conductive carbon paste screen for silica gel keys, conductive Carbon Ink PCB, high-resistance carbon ink oil for potentiometer sliders, low-resistance carbon ink oil for remote controllers, high-resistance carbon ink oil for electronic organ tuning film, low-resistance carbon ink oil for PCB keys, conductive carbon ink for PET film switches, high-resistance carbon paste for electronic drums, antenna Carbon Ink for touch screens, carbon paste for inductive pens for capacitive screens, and conductive circuit boards.
The characteristics of this process have the advantages of previous PTH PCB boards and single-sided PCB, forming a single-sided double-layered PCB board without interconnection holes; Simplifies the production process of PTH PCB boards, which can be realized by steel mesh printing directly, is easy to master, light in weight, and can be thinned, even phenolic cardboard can be used; Parts mounting holes can also be processed; It is suitable for high volume PCB assembly production, shortens the production cycle, reduces the production cost, and has no three wastes pollution--Waste water, waste gas and solid waste.
Carbon Ink PCB can shorten the production cycle of double-sided PCB board by two thirds; The volume of the whole machine is reduced by one quarter to one third; The assembly efficiency of the whole machine is increased by 30%; The production cost is reduced by one-third, so that more double-sided PCB boards or simple multi-layer PCB boards are transformed into conductive carbon Ink PCB. As far as the technical specifications of conductive Carbon Ink PCB are concerned, IEC1249-5-4 contains some technical instructions on conductive coatings; Japan's Hitachi, Toshiba, Panasonic and other famous companies also have some technical specifications for conductive Carbon Ink PCB; Some ink manufacturers, such as Coates, Acheson, Asahi and so on, also have the technical conditions of conductive ink; But these are only some simple explanations and introductions; In 1998 (Shenzhen Sheng Tian Feng Technology Co., Ltd. was established), the standard SJ/T11171-98 "Specification for NPTH Single-sided and Double-sided Conductive Carbon Ink PCB" issued by China's electric industry comprehensively discussed the technical conditions and testing methods of conductive carbon ink PCB boards.

In fact, the process control of Carbon Ink PCB in screen printing room is neither simple nor complex. Let's take a look at the following aspects:
1.Operators must wear gloves to work.
2.During production, the process parameters of each machine and equipment must be carried out according to the relevant operation instructions, and shall not be arbitrarily changed.
3.All machines and equipment must be clean, and there must be no dust, garbage, oil and other sundries on the surface.
4.Screen printing speed and ink returning speed and suction pressure should be controlled in the best range. (Take the printing effect as the inspection basis).
5.Screen, scraper and Carbon Ink shall be selected according to the requirements of engineering MI.
6.The oil must be stirred evenly before use, the viscosity detected by viscometer is within the required range, and the ink should be sealed in time after use.
7.Before printing, the grease, oxide and other pollutants on the board surface must be cleaned, and all carbon-filled Carbon Ink boards must be confirmed by the first board of QA before they can be officially produced.
8.In the process of silk-screen printing, the operator should check at least 2PNL per printing plate, and increase the number of self-checks in special circumstances. 4.9 Drying temperature of Carbon Ink plate is 150℃ for 45 minutes. The drying temperature of the oil-filled hole is 150℃ for 20 minutes, and then
9.For oil resistance measurement, the resistance value of Carbon Ink via hole should be less than 100 ohms, the square resistance of carbon wire should be less than 25Ω/ port (the length of carbon wire ÷ the width of carbon wire× 25 Ω), and more than 2/3 of the oil in the Carbon Ink irrigation hole can be detected according to the drawings of engineering department and the points required by MI.
10.The operator of the baking sheet shall fill in the time when the baking sheet is put into the furnace, the time when the baking sheet is put out of the furnace, the temperature quantity, etc. After being put out of the furnace and cooled, the operator shall inform QA to carry out random inspection of carbon resistance and adhesion test. 11.Each Carbon Ink screen has reached 2,500 prints, so it must be returned to the net room for re-drying the new screen.