Needle marking
Needle marking is a marking process from the group of embossing processes according to DIN 8583 , which corresponds to graining .
With needle marking , permanent marking is achieved on almost all materials using a pneumatically or electrically driven, oscillating hard metal needle . A carbide needle is moved by two stepper motors in the x and y directions and pushed into the material by an up and down movement. Depending on the density of the dots, this creates lettering that can lead to a closed line at a high needle frequency. This makes it possible to mark any characters, logos or 2D codes, such as a data matrix code. A typical application is the labeling of nameplates .
Due to the marking by individual, continuously lying points, the force on the material is very low. This means that pressure-sensitive, thin-walled, coated, hollow or slightly curved finished products can easily be permanently labeled.
In addition to marking with an oscillating marking needle, it is also possible to provide workpieces with dot-matrix writing. In a given grid, for example 5 × 7 or 9 × 13, individual points are pushed into the workpiece electromagnetically. Here, too, the marking is carried out with a hard metal needle, which, depending on the application, is ground at a certain angle at the needle tip. This can create deeper or wider points. Since each point can be precisely defined in its up and down movement, this type of marking is ideally suited for marking 2D codes, such as a data matrix code. But fonts or logos are also conceivable. The advantage of this marking is the displacement of the material and very little material abrasion.