Stone carvings, stone carvings and other ancient high-grade stone artworks have become the earliest application field of laser cleaning because of their fine and vulnerable surface structure. It is found that using laser to remove the dirt on the surface of stone cultural relics has unique advantages. It can very accurately control the beam to move on the complex surface and remove the dirt without damaging the stone relics. The application of laser cleaning machine in stone industry is introduced below.
Application of laser cleaning machine in stone industry.
The binding force between dirt and stone surface is mainly physical force and weak chemical force. Weak chemical forces include the bond energy formed by hydrogen bonds and charge transfer, and physical forces include van der Waals forces (including electrostatic, induced and dispersive effects) and capillary forces. The reason why stone is more difficult to clean than other hard surface materials is that there are a large number of micro pores in natural stone. The capillary force of micro pores not only enhances the binding force between dirt and stone, but also makes it difficult for various external forces to play a role. Wuhan Ruifeng photoelectric laser equipment is cost-effective. With many years of laser R & D experience, the product technology is mature and the product performance is safe and stable. Ruifeng photoelectric laser power always adheres to the attitude of "quality first, service second and price third" to provide customers with the best quality products and services.
One is to make use of the difference in the absorption coefficient of a certain wavelength of laser energy between the base material and the dirt attached to the surface, so that the laser energy can be fully absorbed by the attached dirt, so as to expand or vaporize by heating, and be driven away from the base material by the vapor flow formed by vaporization to achieve the purpose of cleaning. The requirement is that the absorption coefficient of the matrix material to the laser energy should be small, so that the matrix material will not be damaged. Therefore, the key to safe and efficient cleaning is to select the appropriate laser wavelength and control the energy density.
The other is for cleaning when the absorption coefficient of the laser beam by the base material and the surface attachment is not very different, or toxic substances will be generated after the surface attachment is heated. Usually, pulse laser with higher frequency and power is used to impact the cleaned surface to convert part of the beam into sound waves, which return after impacting the hard surface of the middle and lower layers, The returned part interferes with the incident sound wave generated by the laser, resulting in high-energy resonance wave, which makes the scale layer burst slightly, resulting in crushing and easy to separate from the surface of the matrix material.
The above is the application of laser cleaning machine in stone industry. Laser cleaning technology mainly uses laser beam to remove the attachments on the surface of the object to be cleaned at high speed and effectively. It saves time, labor and water, is safe and reliable, has a wide range of applications and is easy to control automatically. Especially for the fine structure of stone surface such as stone carvings, stone carvings and various corners, as well as the cleaning of high-grade stones such as ancient stone cultural relics, the advantages of laser cleaning technology are unmatched by many traditional cleaning processes.
