Using lasers to mark

Lasers can be used to mark a variety of different types of objects. In essence, laser marking involves either altering the optical appearance of the material that is being marked or ablation of one or more of the materials. This is one of the types of laser material processing methods that is particular to marking.

The use of lasers in marking: applications

Laserbeschriftungssystem has been used for a wide variety of applications over the past couple of decades.

A typical industrial product has many different items that need to be labelled with specific details, such as model and serial numbers, logos, barcodes, and what they should be used for. In addition to these items, there are many other items that need to be labeled, such as machine tools, printed circuit boards (PCBs), integrated circuits, cables, keyboard buttons, credit cards, food packages, and bottles. Often, these labels have different details for each individual part, so a simple stamping is not an option

It is often necessary to add traceable information for quality control purposes. In the case of silicon wafers for photovoltaic cells or electronics, the boule from which they were cut and the position at which they were cut are marked on the wafer. This is a useful way of tracing the origin of potential problems, so they can be identified and solved as quickly as possible.

It is known that laser marking has many advantages over other marking technologies, including ink jet printing and mechanical marking, including very high processing speeds, low operating costs (no consumables etc. ), constant quality and durability of the results, the ability to write very small features, and exceptional automation flexibility. It is worth noting, however, that laser marking machinery can be quite expensive.

The information about the technology is as follows:

There is also the possibility of creating the whole label in one shot, by using a suitable type of mask placed at an appropriate point in the beam path so that the mask features are reflected onto the workpiece. In the case of the latter method, a mask must be manufactured for each piece of the part. As a consequence, the pattern cannot be changed from one piece to the next. Additionally, the masks tend to wear out over time and need to be replaced regularly as a result. If coupled with a powerful laser source and a mask of high strength, it may be possible to produce a entire pattern in a short period of time as an alternative, as long as the mask is also sufficientlyentlyently robust. However, it appears that scanning methods are being used more and more frequently. One of the reasons for this is that they are more flexible.

Laser marking machines are machines that use lasers to mark

Typical laser marking machines consist of a pulsed solid-state laser, a compact beam delivery system, as well as other optional accessories, such as fume extractors. As well as an automated movement and alignment machine, a means of inserting and aligning the pieces that are to be marked is also needed. It is common practice in some industrial settings to mark materials “on the fly” as they are moving along the marking machine. Some marking machines (for marking workpieces) are encapsulated to improve laser safety, and are only able to operate when their front door (for supplying workpieces) is closed.

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