Laser engraving, that is a subset of laser marking, is the technique of using lasers to engrave an object. Laser marking, on the contrary, is a broader category of techniques to leave marks on an object, that also includes color change due to chemical/molecular alteration, charring, foaming, melting, ablation, and more. The procedure does not involve using inks, nor does it involve tool bits which contact the engraving surface and wear out, giving it an advantage over alternative engraving or marking technologies where inks or bit heads must be replaced regularly.
The impact of Color Laser Engraving Machine continues to be more pronounced for specially designed “laserable” materials and also for a few paints. Included in this are laser-sensitive polymers and novel metal alloys.
The phrase laser marking is also used as being a generic term covering an extensive spectrum of surfacing techniques including printing, hot-branding and laser bonding. The machines for laser engraving and laser marking are the same, so the two terms are occasionally confused by those without knowledge or expertise in the practice.
A laser engraving machine may be thought of as three main parts: a laser, a controller, along with a surface. The laser is sort of a pencil – the beam emitted from it allows the controller to trace patterns onto the surface. The controller direction, intensity, speed of movement, and spread of the laser beam geared towards the surface. The top is picked to fit exactly what the laser can act on.
You can find three main genres of engraving machines: The most frequent is definitely the X-Y table where, usually, the workpiece (surface) is stationary and the laser optics maneuver around in X and Y directions, directing the laser beam to draw vectors. Sometimes the laser is stationary and the workpiece moves. Sometimes the workpiece moves inside the Y axis as well as the laser inside the X axis. Another genre is perfect for cylindrical workpieces (or flat workpieces mounted around a cylinder) in which the laser effectively traverses a fine helix and also on/off laser pulsing produces the desired image on the raster basis. Within the third method, both the laser and workpiece are stationary and galvo mirrors move the laser beam within the workpiece surface. Laser engravers applying 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 surface should be on the focal plane of the laser’s optical system, and is usually symbolic of its focal point. This aspect is usually small, perhaps under a fraction of a millimeter (depending on the optical wavelength). Just the area inside this center point is quite a bit affected if the laser beam passes over the surface. The energy delivered from the laser changes the top of the material under the point of interest. It may heat the top and subsequently vaporize the fabric, or perhaps the material may fracture (called “glassing” or “glassing up”) and flake from the surface. Cutting from the paint of any metal part is usually how material is Mini Laser Marking Stainless Steel.
In the event the surface material is vaporized during laser engraving, ventilation with the use of blowers or a vacuum pump are almost always required to remove the noxious fumes and smoke as a result of this process, and then for removal of debris on the surface to allow the laser to continue engraving.
A laser can remove material very efficiently since the laser beam could be created to deliver energy towards the surface in a manner which converts a higher amount of the light energy into heat. The beam is extremely focused and collimated – generally 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, because of this efficiency, the machine used in laser engraving may heat quickly. Elaborate cooling systems are required for your laser. Alternatively, the laser beam could be pulsed to decrease the quantity of excessive heating.
Different patterns may be engraved by programming the controller to traverse a particular path for that laser beam over time. The trace in the laser beam is carefully regulated to attain a consistent removal depth of material. For example, criss-crossed paths are avoided to ensure that each etched surface is subjected to the laser just once, therefore the same amount of material is removed. The speed where the beam moves across the material can also be considered in creating engraving patterns. Changing the intensity and spread of the beam allows more flexibility within the design. For instance, by changing the proportion of time (referred to as “duty-cycle”) the laser is excited during each pulse, the power delivered to the engraving surface can be controlled appropriately for that material.
Since the position of the laser is known exactly from the controller, it is not essential to add barriers to the surface to avoid the laser from deviating from your prescribed engraving pattern. As a result, no resistive mask is necessary in laser engraving. This really is primarily why this technique is different from older engraving methods.
A good illustration of where laser engraving technologies have been adopted into 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 may trace out numbers and letters onto the surface being marked. This is particularly helpful for printing dates, expiry codes, and lot numbering of merchandise traveling along a production line. Laser marking allows materials made from plastic and glass to be marked “on the move”. The area where marking happens is named a “marking laser station”, an entity often present in packaging and bottling plants. Older, slower technologies like hot stamping and pad printing have largely been phased out and substituted for laser engraving.
For further precise and visually decorative engravings, a laser table is utilized. A laser table (or “X-Y table”) is actually a sophisticated setup of equipment used to guide the laser beam more precisely. The laser is usually fixed permanently aside in the table and emits light towards a set of movable mirrors so that every point of the table surface could be swept from the laser. At the aim of engraving, the laser beam is focused via a lens in the engraving surface, allowing very precise and intricate patterns pmupgg be traced out.
A typical setup of any laser table necessitates the Handheld Marker Machine parallel to one axis from the table targeted at a mirror mounted on the end of your adjustable rail. The beam reflects off of the mirror angled at 45 degrees so that the laser travels a path exactly along the duration of the rail. This beam will be reflected by another mirror mounted to your movable trolley which directs the beam perpendicular for the original axis. Within this scheme, two degrees of freedom (one vertical, then one horizontal) for etching can 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