At present, laser composite cleaning is widely used in fields such as ships, auto repairs, rubber molds, high-end machine tools, rails, and environmental protection. It can effectively remove resin, paint, oil, stains, dirt, rust, coatings, plating, and oxide layers on the surface of objects.
For example, in laser cleaning of thicker coating materials, a single laser has a large multi-pulse energy output and high cost. Using pulse laser-semiconductor laser composite cleaning can quickly and effectively improve the cleaning quality without causing damage to the substrate; in aluminum In laser cleaning of highly reflective materials such as alloys, a single laser has problems such as high reflectivity. Pulse laser-semiconductor laser composite cleaning is used. Under the action of semiconductor laser thermal conductivity transmission, the energy absorption rate of the oxide layer on the metal surface is increased, making the pulse laser beam peel off the oxide layer faster, thereby more effectively improving the removal efficiency, especially the paint removal efficiency is increased by more than 2 times.
01 Carbon dioxide laser cleaning - a magic weapon for removing non-metallic materials
Carbon dioxide laser is a gas laser that uses CO2 gas as the working substance. It is filled with CO2 gas and other auxiliary gases (helium and nitrogen and a small amount of hydrogen or xenon). It has good directivity, monochromaticity, and frequency stability. Since discharge tubes are usually made of glass or quartz materials, common CO2 lasers include glass tube CO2 lasers and metal RF tube CO2 lasers.
Based on its unique wavelength, the CO2 laser is the best choice for surface cleaning of non-metallic materials such as glue removal, coating removal, and ink removal. For example, using a CO2 laser to remove the composite paint layer on the surface of an aluminum alloy neither damages the surface of the anodized film nor reduces its thickness. Lianying Laser has a wealth of laser cleaning solutions in the 3C industry PCB ink cleaning, new energy power battery pole piece roller rubber cleaning, and soft package tab sealing, and can provide customers with customized needs.
02 UV laser cleaning - using precision devices
Ultraviolet lasers used for laser micromachining mainly include excimer lasers and all-solid-state lasers. Ultraviolet laser has short wavelengths and high single photon energy. It can directly break the chemical bonds connecting materials. The material is peeled off the surface in the form of gas or particles. The heat-affected zone generated during the processing is small. It has unique advantages in micro-manufacturing, such as Semiconductor materials such as Si and GaN, optical crystals such as quartz and sapphire, and polymer materials such as polyimide (PI) and polycarbonate (PC) can effectively improve manufacturing quality.
Ultraviolet laser is considered to be the best laser cleaning solution in the field of precision electronics. Its most distinctive fine "cold" processing technology can micro-process and treat the surface without changing the physical properties of the object. It can be widely used in communications, optics, military, criminal investigation, medical, and other industries and fields. For example, the 5G era has given rise to market demand for FPC processing. The application of UV laser machines makes precision cold processing of materials such as FPC possible.
03 Continuous fiber laser cleaning - remove floating rust on metal surfaces
The working principle of a continuous fiber laser is that the pump light emitted by the pump source is coupled into the gain medium through a reflecting mirror. Since the gain medium is a fiber doped with rare earth elements, the pump light is absorbed, and the rare earth ions that absorb the photon energy generate energy. stage transition and achieve particle number inversion. The inverted particles pass through the resonant cavity and transition from the excited state back to the ground state, releasing energy and forming a stable laser output. The biggest advantage is that it can continuously emit light.
In actual laser cleaning applications, continuous fiber lasers are rarely used, but there are also a few applications, such as some large steel structures, pipelines, etc. Due to their large size fast heat dissipation, and low requirements on substrate damage, continuous fiber lasers can be selected.
04 Pulse laser cleaning - cleaning with high requirements on the surface
Pulse laser cleaning machines use high-energy, high-frequency pulse laser beams to instantly heat and cool the surface of objects, forming instantaneous temperature gradients and thermal stress, so that contaminants and thin coverings can fall off the surface. The principle is that through short-term, high-energy irradiation of laser pulses, high temperature, and high pressure is instantly generated, which quickly evaporates or crushes pollutants to achieve a cleaning effect.
Pulse laser cleaning machines are widely used in various industries, such as automobile manufacturing, electronic equipment, aerospace, semiconductor processing, etc. It can be used to remove various contaminants such as paint, oxides, welding slag, etc. Because pulse laser cleaning has the characteristics of high energy and short action time, it is suitable for cleaning objects with high surface requirements.