Summary of Laser Cleaning System
Everybody is looking for cleaner and non-invasive cleaning methods
There are a variety of cleaning methods in traditional cleaning industry, such as chemical and mechanical methods. Now the environmental protection and safety awareness are increasing drastically, environmental protection laws and regulations become more and more stringent, so available chemicals methods in this field become less. Everybody is looking for cleaner and non-invasive cleaning methods. Nevertheless the laser cleaning is characterized by non-abrasive, non-contact, non-thermal effects and suitable for various material surface cleaning, which is considered to be the most reliable, effective and safety solution.
Laser cleaning equipment is a high-tech and latest product of surface cleaning. It is easy to install, operate and automated. Only turn on the power and then you can start to clean without chemical reagent, medium and water. it is with advantages of manual adjustment of focus, spherical surface cleaning and high cleanliness of cleaning surface. It can remove the resin, oil contamination, stains, dirt, rust, coating, carbon rests, burned rubbe or plastics, plating and paint on the surface of different shape metal objects and it removes perfectly in the stone caving surface.
COVER LAYERS REMOVAL AND DECOATING
Paint - Rust - Graffiti - Grease - Carbonized Material
SURFACE CLEANING and RESTAURATION
Dirt & Contamination Removal
PRE-TREATEMENT OF SURFACE
Before Bonding, coating, painting, Brazing, Welding
Beam intensity
Beam intensity is the crucial parameter in laser cleaning process. If it is not correctly selected, it may damage the substrate. The beam intensity and their effects on the substrate and the product to remove influence a lot the speed of removing and the way of removing.
Wavelength of laser
Beam Area
Beam size is one of the factors that influence cleaning efficiency and time of cleaning.
A smaller beam size is normally good for laser cleaning process, because of the high removal rate and the less cleaning time. However, if the laser beam area is too small, it may damage the surface. Thus the beam size should be selected carefully
Pulse duration
Pulse duration is the time it takes for the laser to emit one pulse
In the case of long-pulse lasers and continuous lasers (CW), the removal of surface material like pâint, dirt, oil, etc.. is done by vaporization.
At the same time, ablation of the material occurs in the case of high power short-pulse lasers, by acoustic shock waves created by the absorption of highintensity laser energy. A higher removal rate can be achieved in the case of short pulses for a fixed amount of laser energy.
If the pulse duration is too short, the cleaning is not efficient, at the same time if pulse duration is too long, substrate is affected by heat. Thus appropriate pulse duration should be selected. Therefor are needed laser sources with fine pulse adjusting.
Pulse repetition rate
Pulse repetition is the number of pulses per second.
If dwell time is too short, the dust from the graffiti, dirt, oil,.. and the laser pulse interfere with each other. Hence the laser pulses do not reach the target. If the pulse repetition rate is too long, the cleaning takes more time. Therefore pulse repetition rate should be selected as appropriate.
Number of pulses
Scanning speed
Angle of incidence of the laser beam
Is laser cleaning good for me?
What is laser cleaning and how does it work?
Laser cleaning system distributes thousands of focused laser pulses per second onto the target surface. These powerful beam pulses are linearly deflected & placed adjacent to each other. Most laser energy is absorbed by the target surface, creating micro-bursts of plasma that decompose the target layer/coating/contaminant through sublimation. Thermal energy is rapidly dispersed as laser vaporized residues are removed from the substrate. Process speed relates to the laser energy absorption properties of the target material & laser power as measured in watts.
Does laser cleaning damage the underling surface?
The substrate material, unlike the target contaminant or coating, normally does not absorb, but rather reflects laser beam energy. Once a reflective substrate material has been reached, the laser ablation process automatically stops. Due to typically high reflection factors, metallic surfaces are especially suitable for laser cleaning. Precise laser beam adjustments enable treatment for many applications without undesirable mechanical or thermal effects to the substrate.
Where does the stuff removed by the laser cleaning go?
An integrated suction system provides continuous vacuum at the laser target interface. This immediately captures ablated contaminants, vaporized coating fumes & particles, which are pulled through a hose to a modular fume extractor with high efficiency particle & carbon filters. Laser cleaning … a dust-free process with nothing to clean-up!
The Laser Cleaning Advantage
| Laser Cleaning | Chemical Products | Sand Blasting | Hand Cleaning | Laser Cleaning |
|---|---|---|---|---|
| Precise/selective cleaning | ✓ | X | ✓ | ✓ |
| No consumables needed | X | X | X | ✓ |
| No collateral waste | X | X | ✓ | ✓ |
| No infiltration | X | X | ✓ | ✓ |
| Can clean sensitive parts | ✓ | X | X | ✓ |
| Low noise operation | ✓ | X | ✓ | ✓ |
| Possibility to clean in motion | X | X | ✓ | ✓ |
| No rinsing/drying | X | ✓ | ✓ | ✓ |
| Possibility to clean hot tools/parts | X | X | X | ✓ |
| No need to dismantle tools/moulds | X | X | ✓ | ✓ |
| Minimal work area required | X | X | ✓ | ✓ |
| Low power consumption | ✓ | X | ✓ | ✓ |
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