PCB board traceability marking processing, mainly screen printing and laser marking two ways. So, what are the advantages and disadvantages of the two?

Screen printing marking method

Screen printing process is the use of making a good graphics screen, under the pressure of the character ink from the screen through the part of the mesh, and printed on the surface of the circuit board, and the screen on the rest of the mesh will Was blocked, not through the ink, only the surface of the board to form a blank, thus forming a text, logo, pattern.

advantage
Pre-investment costs are relatively low, marking fast

Disadvantages
Easy to fall off: PCB surface of the ink in the process of easy to fall off because of friction, fade, resulting in ambiguous characters.

Easy to remove: through hydrochloric acid or cyclohexanone and other solutions can be directly removed the surface of the PCB board characters, likely to cause information tampering.
Consumables: screen printing need to continue to consume ink and other accessories tools.
Rough information: screen printing can only be marked in the larger format of the PCB board, and the font is not clear rough.

Pollution of the environment: the printing process using organic solvents and heavy metal elements and other chemical raw materials, with a certain degree of toxicity, will cause personal injury to the staff, and the air and the environment pollution.

Laser marking method

Laser marking is the use of high-energy density of the laser board on the local exposure, so that the surface material vaporization or color changes in the chemical reaction, leaving a permanent marking of a marking method. Laser marking can play a variety of words, symbols and patterns, etc., the size of the characters can be from the millimeter to the micron level, which has a special significance of the product security.

advantage
Anti-damage: the use of laser directly in the material surface etching text, symbols, with a permanent, able to damage.
Easy to operate: as long as the design of a good graphics on the computer, you can let the graphics in an instant show.
Mark clear: high precision laser processing, spot fine, to achieve fine marking, clear and beautiful pattern.
Save material: "no contact" processing does not damage the workpiece, do not destroy the material, save material costs.
Safety and environmental protection: only a small amount of gas and through the exhaust, do not need chemical substances to help, as much as possible to protect the operator's safety and working environment.
Low operating costs: laser marking only consume a small amount of electricity, without ink and other accessories.

Disadvantages
Pre-investment costs are relatively high

With the rapid development of electronic products manufacturing technology, portable electronic products increasingly miniaturization, high integration, the direction of light development. Coupled with the development of packaging technology, pad and spacing are getting smaller and smaller, making printing on the bit has become more difficult. The laser marking with its accuracy and flexibility, to overcome the easy printing off the screen printing, processing accuracy is not high and other technical defects, PCB board industry will play a pivotal role!