1. Overview
In the method of making a printed circuit board, the most common methods are subtractive method and additive method. Addition method uses electroless or electroplated copper to generate the circuit. The method of using conductive ink is a kind of additive method. Conducting ink is used to make wires and printed on insulators. This method is easy and effective. Made into various shapes of printed circuits. The production process of a carbon film printed board is a printed board manufacturing method that combines a subtractive method and an additive method.

Currently, carbon film printed boards have made breakthrough progresses in the field of application, especially in electronic products with low electric power, and have been widely used as permanent conductive coatings on printed circuit boards. It was adopted by many electronic machine designers and promoted.

2. Carbon film printed board production process characteristics
Carbon film printed boards, along with the rapid development of the electronics industry, are increasingly used in the common electrical and instrument industries that tend to be multifunctional and miniaturized. Such as: televisions, telephones, keyboards, game consoles, video recorders, etc. The continuous development of new technologies and new functions has been adopted, and the electronic fields of computer keyboards, card-type computing devices, miniature tape recorders, electronic measuring devices, and SMT have also begun to be used, and their reputation has been improved and their demand has been expanded.

The carbon film printed board adopts a simple screen printing process, and adds one or two layers of conductive patterns on a single-sided printed board to achieve high-density wiring. The printed conductive patterns are used as interconnection wires in addition to the conductive wires. Resistors, key switch contacts, and electromagnetic shielding layers have been adapted to the trend of miniaturization, light weight, and multi-functionality of electronic products.