Laser engraving, which is a subset of laser marking, is the practice of using lasers to engrave an object. Laser marking, on the contrary, is actually a broader group of methods to leave marks on an object, which also includes color change because of chemical/molecular alteration, charring, foaming, melting, ablation, and more. The technique does not involve the use of 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 Laser Marking System has become more pronounced for specially engineered “laserable” materials as well as for some paints. Such as laser-sensitive polymers and novel metal alloys.
The term laser marking can also be used as 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, in order that the two terms are sometimes confused by those without knowledge or experience in the practice.
A laser engraving machine may be regarded as three main parts: a laser, a controller, along with a surface. The laser is sort of a pencil – the beam emitted as a result allows the controller to trace patterns to the surface. The controller direction, intensity, speed of motion, and spread in the laser beam targeted at the surface. The top is picked to complement what the laser can act on.
You can find three main genres of engraving machines: The most frequent is the X-Y table where, usually, the workpiece (surface) is stationary and the laser optics move about in X and Y directions, directing the laser beam to draw vectors. Sometimes the laser is stationary and also the workpiece moves. Sometimes the workpiece moves in the Y axis and the laser within the X axis. Another genre is perfect 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 a raster basis. Inside the third method, both laser and workpiece are stationary and galvo mirrors move the laser beam within the workpiece surface. Laser engravers using this technology can work in either raster or vector mode.
The stage where the laser (the terms “laser” and “laser beam” can be utilized interchangeably) touches the surface ought to be on the focal plane of the laser’s optical system, and is usually synonymous with its center point. This time is normally small, perhaps less than a fraction of any millimeter (depending on the optical wavelength). Merely the area inside this focal point is quite a bit affected if the laser beam passes on 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 content, or maybe the material may fracture (known as “glassing” or “glassing up”) and flake off the surface. Cutting with the paint of the metal part is normally how material is Rotary Engraving.
If the surface material is vaporized during laser engraving, ventilation through the use of blowers or perhaps a vacuum pump are typically required to eliminate the noxious fumes and smoke as a result of this method, and for removing of debris on the surface to allow the laser to continue engraving.
A laser can remove material very efficiently as the laser beam can 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 equipment used in laser engraving may heat up rather quickly. Elaborate cooling systems are essential for that laser. Alternatively, the laser beam might be pulsed to decrease the volume of excessive heating.
Different patterns can be engraved by programming the controller to traverse a particular path for that laser beam as time passes. The trace in the laser beam is carefully regulated to accomplish a regular removal depth of material. For instance, criss-crossed paths are avoided to ensure each etched surface is in contact with the laser only once, and so the equivalent amount of material is taken off. The rate in which the beam moves across the material is also considered in creating engraving patterns. Changing the intensity and spread from the beam allows more flexibility within the design. For instance, by changing the proportion of your time (called “duty-cycle”) the laser is switched on during each pulse, the energy delivered to the engraving surface could be controlled appropriately for your material.
Since the positioning of the laser is famous exactly from the controller, it is far from required to add barriers towards the surface to avoid the laser from deviating from your prescribed engraving pattern. Because of this, no resistive mask is required in laser engraving. This is primarily why this procedure is different from older engraving methods.
A great demonstration of where laser engraving technology has been adopted in to the industry norm is 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 really is particularly useful for printing dates, expiry codes, and lot numbering of merchandise traveling along a production line. Laser marking allows materials made of plastic and glass to get marked “on the move”. The location where the marking occurs is named a “marking laser station”, an entity often seen in packaging and bottling plants. Older, slower technologies like hot stamping and pad printing have largely been eliminated and replaced with laser engraving.
For more precise and visually decorative engravings, a laser table is used. A laser table (or “X-Y table”) is really a sophisticated setup of equipment utilized to guide the laser beam more precisely. The laser is normally fixed permanently to the side in the table and emits light towards a pair of movable mirrors so that every point of the table surface could be swept through the laser. At the purpose of engraving, the laser beam is focused through a lens at the engraving surface, allowing very precise and intricate patterns pmupgg be traced out.
An average setup of the laser table requires the Laser Glass Engraving Machine parallel to a single axis in the table aimed at a mirror mounted on the end of an adjustable rail. The beam reflects off of the mirror angled at 45 degrees so the laser travels a path exactly along the length of the rail. This beam will then be reflected by another mirror mounted to some movable trolley which directs the beam perpendicular for the original axis. In this particular scheme, two levels of freedom (one vertical, and 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