Major marking methods are as follows:
- - Laser marking
- Irradiate a laser beam on a material to change and color it. Marking contents can be easily changed using a software. Clear fine marking even on tiny parts is possible.
- - Inkjet printing
- Shoots a jet of micro-particles of ink to mark with dots. An inkjet printer used with a personal computer, and a printer for industrial-use to mark best-before-date on laminated film are the major applications.
- - Ink stamping
- Presses ink-supplied relief or intaglio onto an object to mark. This is the most popular method from the past. Though the equipment is less expensive, production routine cost is relatively high; additionally, it requires to control ink.
- - Punching
- Presses a numbering head, on which desired marks such as letter, character are engraved, onto an object. This is widely accepted for marking on metal. While the mark is very reliable and ever-lasting, this method is less productive and needs much time to change the head.