Laser engraving, which is a subset of laser marking, is the technique of using lasers to engrave an object. Laser marking, on the other hand, is actually a broader group of techniques to leave marks on an object, that also includes color change as a result of chemical/molecular alteration, charring, foaming, melting, ablation, and much more. The procedure does not involve the usage of inks, nor will it involve tool bits which contact the engraving surface and wear out, giving it an edge over alternative engraving or marking technologies where inks or bit heads have to be replaced regularly.
The impact of Laser Cleaning has been more pronounced for specifically created “laserable” materials as well as for a few paints. These include laser-sensitive polymers and novel metal alloys.
The term laser marking is also used being a generic term covering a wide spectrum of surfacing techniques including printing, hot-branding and laser bonding. The machines for laser engraving and laser marking are similar, in order that the two terms are often confused by those without knowledge or experience in the practice.
A laser engraving machine can be thought of as three main parts: a laser, a controller, and a surface. The laser is sort of a pencil – the beam emitted from it allows the controller to trace patterns to the surface. The controller direction, intensity, speed of movement, and spread in the laser beam aimed at the outer lining. The top is picked to fit what the laser can act on.
You can find three main genres of engraving machines: The most typical is the X-Y table where, usually, the workpiece (surface) is stationary and also the laser optics maneuver around in X and Y directions, directing the laser beam to attract vectors. Sometimes the laser is stationary and the workpiece moves. Sometimes the workpiece moves inside the Y axis and the laser within the X axis. A second genre is for cylindrical workpieces (or flat workpieces mounted around a cylinder) where laser effectively traverses an excellent helix as well as on/off laser pulsing produces the required image on the raster basis. In the third method, the laser and workpiece are stationary and galvo mirrors move the laser beam within the workpiece surface. Laser engravers by using this technology can work in either raster or vector mode.
The stage where the laser (the terms “laser” and “laser beam” may be used interchangeably) touches the top needs to be on the focal plane from the laser’s optical system, and is usually synonymous with its focal point. This time is usually small, perhaps under a fraction of any millimeter (depending on the optical wavelength). Only the area inside this focal point is significantly affected once the laser beam passes over the surface. The energy delivered through the laser changes the surface of the material under the point of interest. It could heat up the top and subsequently vaporize the material, or maybe the material may fracture (called “glassing” or “glassing up”) and flake from the surface. Cutting from the paint of the metal part is generally how material is Carbon Fiber Laser Cutting Machine.
When the surface material is vaporized during laser engraving, ventilation by using blowers or even a vacuum pump are more often than not necessary to eliminate the noxious fumes and smoke as a result of this process, as well as for removal of debris on the surface to enable the laser to continue engraving.
A laser can remove material very efficiently since the laser beam may be made to deliver energy for the surface in a manner which converts a very high amount of the sunshine energy into heat. The beam is highly focused and collimated – in most non-reflective materials like wood, plastics and enamel surfaces, the conversion of light energy to heat is much more than x% efficient. However, due to this efficiency, the gear used in laser engraving may heat quickly. Elaborate cooling systems are essential for the laser. Alternatively, the laser beam could be pulsed to lower the quantity of excessive heating.
Different patterns could be engraved by programming the controller to traverse a certain path for your laser beam over time. The trace from the laser beam is carefully regulated to accomplish a regular removal depth of material. For instance, criss-crossed paths are avoided to ensure that each etched surface is exposed to the laser just once, so the same amount of material is taken off. The pace at which the beam moves over the material is also considered in creating engraving patterns. Changing the intensity and spread from the beam allows more flexibility in the design. For instance, by changing the proportion of your time (called “duty-cycle”) the laser is switched on during each pulse, the power delivered to the engraving surface could be controlled appropriately for the material.
Since the position of the laser is famous exactly through the controller, it is really not required to add barriers to the surface to stop the laser from deviating from the prescribed engraving pattern. Because of this, no resistive mask is required in laser engraving. This can be primarily why this technique differs from older engraving methods.
An excellent example of where laser engraving technology has been adopted to the industry norm will be the production line. In this particular setup, the laser beam is directed towards a rotating or vibrating mirror. The mirror moves in a manner which might trace out numbers and letters onto the surface being marked. This can be particularly helpful for printing dates, expiry codes, and lot numbering of items traveling along a production line. Laser marking allows materials made of plastic and glass to become marked “on the move”. The location where the marking occurs is known as “marking laser station”, an entity often present in packaging and bottling plants. Older, slower technologies including hot stamping and pad printing have largely been eliminated and substituted with laser engraving.
For more precise and visually decorative engravings, a laser table is utilized. A laser table (or “X-Y table”) is actually a sophisticated setup of equipment employed to guide the laser beam more precisely. The laser is generally fixed permanently to the side from the table and emits light towards a set of movable mirrors to ensure that every point of the table surface could be swept from the laser. At the point of engraving, the laser beam is focused by way of a lens in the engraving surface, allowing very precise and intricate patterns pmupgg be traced out.
A typical setup of any laser table requires the Co2 Cutter parallel to one axis from the table aimed at a mirror mounted on the end of an adjustable rail. The beam reflects from the mirror angled at 45 degrees so that the laser travels a path exactly along the duration of the rail. This beam will then be reflected by another mirror mounted to your movable trolley which directs the beam perpendicular to the original axis. In this scheme, two levels of freedom (one vertical, and something horizontal) for etching could be represented.
Jinan MORN Technology Co., Ltd. (MORN GROUP) is a leading laser machine manufacturers and exporter in China. We are specialized in fiber laser cutting machine and fiber laser marking machine with 10 years experience.
Jinan MORN Technology CO., Ltd.
Address:13F, Building 5, Qisheng Mansion,Xinluo Street,High-Tech Zone, Jinan, China, 250101
Tel: (+86) 531-5557-2337