What is Carbon Printed Circuir Board and What is its capability? | PCBONLINE
Thur, Jan 10, 2019
Carbon PCB Prototype
Carbon printing oil refers to the use of screen printing technology, printed on the PCB board designated position of carbon oil, after the oven curing test OK to form a qualified carbon film with a certain resistance value to replace the original resistance element. The production is similar to the character screen printing, except that the carbon oil has good electrical conductivity, and the character is a semiconductor material, only plays the role of marking and welding
PCB Production Capacity
1, carbon oil clearance because of carbon oil has good conductivity, so the finished product plate has a certain gap of carbon oil required to ensure that do not short circuit, usually require product minimum eight mil clearance gap(HOZ ), 12 mil clearance gap (1-3 oz copper), if the production film can increase the gap, the gap as far as possible to increase the finished product to ensure no short circuit.
2. Minimum alignment tolerance of carbon oil: +/-6mil
3. Size of carbon oil window and the gap with copper PATTERN: considering factors such as alignment tolerance and oil infiltration, carbon oil PAD single side needs 6mil (HOZ base copper) and 8mil (1-3oz base copper) larger than copper PAD to ensure no copper exposure. Correspondingly, the gap between the carbon oil window and the surrounding copper PATTERN also needs to be 6mil (HOZ base copper) and 8mil (1-3oz base copper), so as to avoid the carbon oil covering the surrounding copper PATTERN and thus avoiding short circuit