Carbon film printed boards are inexpensive and of stable quality, especially suitable for electronic products with button functions. Carbon film printed boards are a type of conductive offset printed boards that originated in Japan and developed into Western Europe, Taiwan, and Hong Kong in the 1970s. They were introduced to mainland China in the mid-1980s. Carbon film printed board is a printed board that uses carbon conductive printing material coated on the substrate and solidified to form carbon conductive patterns, abbreviated as carbon film board. Carbon conductive printing material, also known as carbon paste, is a liquid paste, one component thermal curing type printing material. It is mainly composed of a mixture of selected carbon powder and high-quality conductive fillers such as graphite, epoxy resin, curing agent, additives, and solvents. In addition to the good printing suitability of typical printing materials, it also has fast conductivity and is a functional printing material.
As a high-quality circuit board manufacturer, in the fierce market competition, we adhere to the concept of service first, fully implement the seven culture of the enterprise, respect customers as heaven, and do our best to create value for customers. Therefore, we have gained a place in the PK of circuit board manufacturers. We can support the manufacturing of through-hole boards, flexible circuit boards, HDI, and various multi-level complex circuit boards. Many domestic and foreign customers have established long-term cooperative relationships with us, and more and more customers have recognized us and adopted our circuit board production services, which is also a huge driving force for us to quickly take off and achieve enterprise growth. The survival of circuit board manufacturers has long been in the red sea, and why we can stand out largely depends on our philosophy of serving customers. In fact, there is not much difference in equipment capabilities among factories at the same level, and the difference in quality mainly depends on people. This includes basic human literacy, especially management literacy, personnel training, equipment maintenance, operating standards, quality testing procedures, etc. When problems arise, our first reaction is to help customers solve them, at all costs, quickly save their market reputation, and win their continued support through practical actions, rather than shirking responsibility or simply relying on verbal apologies. Many circuit board manufacturers' development lags behind, and the reason is attributed to fierce competition in the industry. In fact, due to the stable industry profit margin level, many circuit board manufacturers with mixed qualities will be shuffled. Only enterprises with standardized market concepts and operational capabilities can continue to grow and search for blue oceans in the red ocean.
The production process of carbon film PCB is a combination of subtractive and additive methods for PCB manufacturing.
At present, carbon film printed boards have made breakthrough progress in the field of application, especially in electronic products with low electrical power. As a permanent conductive coating on printed boards, it has been adopted and promoted by many electronic machine designers.
With the rapid development of the electronic industry, carbon film PCBs are gradually being adopted in daily appliances and instruments, which tend to be multifunctional and miniaturized. For example: television, telephone, electronic organ, game console, video recorder, etc. Its new technologies and functions have been continuously developed and utilized, and the electronic fields of computer keyboards, card computing machines, micro recorders, electronic measuring devices, and SMTs have also begun to use carbon film printed boards, thereby increasing its reputation and expanding demand.
Carbon film PCB uses a simple screen printing process to add one or two layers of conductive graphics on a single sided printed board to achieve high-density wiring. The printed conductive graphics not only serve as interconnecting wires, but also as resistors, button switch contacts, and electromagnetic shielding layers.
The characteristic of this process is that it has the advantages of both empty metallized printed boards and single sided printed boards, forming a single sided double-layer printed board without interconnection holes; Simplify the production process of perforated metal printed boards, which can be directly printed through screen printing and is easy to master; Lightweight and able to achieve thinness, even phenolic cardboard can be used; Parts installation holes can also be punched and processed; Adapted to mass production, shortened production cycle, production cost, and no three waste pollution.
Carbon film PCB can shorten the production cycle of double-sided boards by two-thirds; Reduce the overall volume by a quarter to a third; 30% improvement in overall assembly efficiency; The production cost has decreased by one-third, leading to the conversion of more double-sided perforated boards or simple multi-layer boards towards carbon film PCB production.
In terms of the technical specifications for carbon film printed boards, some technical descriptions related to conductive coatings in IEC1249-5-4; Famous companies such as Hitachi, Toshiba, and Panasonic in Japan have also developed some technical specifications for carbon film PCBs; Some ink manufacturers. Technologies such as Takashi, Tamura, Acheson, and Asahi also have the technical conditions for conductive ink; But these are only some simple explanations and introductions; The standard SJ/T11171-98 "Specification for Non Metallized Single and Double sided Carbon Film Printed Boards" issued by China's electronics industry in 1998 comprehensively discusses the technical conditions and testing methods of carbon film boards.
