There are multiple ways to perform "marking."
Here we will introduce the two main groups of marking: "contact marking" and "non-contact marking."
Using a pen to write information by hand is the simplest and most inexpensive method. This method is effective when the number of products manufactured is small. However, because people write the information, there is the possibility that they will make mistakes.
Stamping can be divided into two major categories: hand pressing and machine pressing. If too much ink adheres to the surface or if the stamping pressure is too strong, the characters will be smudged. On the other hand, if too little ink adheres to the surface or if the stamping pressure is too weak, the characters will be faint. Consequently, it is difficult to continuously mark clean characters. This method is not suited to marking on curved surfaces or soft objects. The characters are not changed automatically, so work is required when performing calendar or counter marking.
A printer or similar device is used to print the labels before they are affixed to the products, so it is possible to acquire clean marking. However, the more products there are, the greater the cost of the labels for these products. Also, time and effort must be spent to manage the inventory of labels. Different from direct marking on products, the major problem is missing characters due to labels peeling off.
Because the surface of the product is dented, it is possible to mark the product in a way that the information does not fade. On the other hand, it is difficult to change the marked details. Also, because the product is subjected to impacts, this method is not suited to applications in which accuracy is required.
Inkjet printers spray ink to write characters on products without touching them. They can mark curved surfaces, soft objects, and even products moving at high speeds. Inkjet printers are also equipped with useful functions such as updating the date and serial numbers automatically.
Laser markers use XY mirrors to scan a laser beam to form characters, 2D codes, logos, or other information. They have the major advantage of minimal daily maintenance and do not have consumables such as ink. It is also possible to mark characters that will not fade making laser markers the ideal solution for permanent marking.