±10% 0Ω~3MΩ Linearity Tolerance ±1%-±5% 1 Million Cycles FR4 Controller Carbon PCB Board
Carbon ink is printed on PCB surface as a conductor to connect two traces on PCB. For carbon ink PCB, the most important is the quality and resistance of carbon oil, meanwhile, the Immersion silver PCB and Immersion tin PCB cannot be printed carbon oil, because they are Oxidizing.Meanwhile, the minimum line space should be more than 0.2 mm so that it is easier to manufacture and control without the short circuit.
Carbon ink can be used for keyboard contacts, LCD contacts and jumpers. The printing is performed with conductive carbon ink.
- Carbon elements must resist soldering or HAL.
- Insulations or Carbon widths may not reduce below 75 % of the nominal value.
- Sometimes a peel able mask is necessary to protect against used fluxes.
Special Carbon Oil Process
1.The operator must wear gloves
2.The equipment must be clean, the surface shall not have dust, garbage and other debris
3.Silk speed and back to the ink speed suction pressure control in the best range. (Based on the printing effect as a test)
4.Screen stencil, scraper, carbon oil specific requirements in accordance with the requirements of engineering MI
5.Carbon oil must be mixing evenly before use, with a viscometer to detect the viscosity within the required range, the ink need timely closure after finish the use.
6.Before printing,all boards must be cleaned plate grease, oxide and other pollutants, all carbon plate carbon plate must be confirmed by the QA before the official production
7.Carbon board drying temperature 150 ℃ time 45 minutes. Carbon oil hole Drying temperature 150 ℃ Time 20 minutes
8.Carbon oil resistance measurement, resistance value of carbon oil should be less than 100 ohms, carbon line resistance should be less than 25Ω
9.After the release from oven, the operator should inform the QA to check the carbon resistance and do the adhesion test.
10.Each carbon oil screen version use max 2500 prints, must be returned to the network room re-drying the new version when up to 2500 times.