The hottest new laser marking technology to improv

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New laser marking technology improves the quality of glass

a new technology makes it possible to use the sealed off CO2 laser to directly make high-quality marks with clear outline on the glass. This is a technology that can replace the expensive solid-state laser and the traditional glass marking method (25W CO2 laser still focuses on reducing the purchase cost, which can meet most of the requirements of marking on the glass). CO2 laser marks the glass by destroying the surface of the glass, so it is allowed to have a certain number of cracks on the glass, but excessive cracks will lead to unclear marks, potential weakening of material strength, and even more serious, loosening of the substrate. These problems can be avoided by accurately controlling the amount of cracks in the material during the marking process

there are three methods to control the type and number of cracks on the glass surface:

the leading method is to use multiple laser radiation; The second method is to use discrete points to form annular cracks; The third method is to produce cracked surface cracks. Using a single laser radiation can produce a clear-cut visible mark on the glass, but the direction of the crack and stress pattern will expand perpendicular to the laser movement. Within a short time or even a few days after the mark is printed, these cracks perpendicular to the laser moving direction will form new cracks, expand to the area near the original mark, and form fragments, which will affect the clarity of the mark. Using multiple laser radiation, the areas adjacent to the marked area are heated by heat conduction, so that these areas form a stress gradient and reduce the possibility of secondary fracture. This method is very effective in marking soda lime glass and borosilicate glass. Primary laser radiation is more effective in marking fused silica glass and quartz glass, because the expansion coefficient of these two materials is very low

the second method is to use a series of annular cracks to form characters, bar codes, square or rectangular codes and other shape code patterns. Low density annular cracks are produced in glass by heating and cooling cycles. When the glass is heated, it will expand and squeeze the surrounding materials. When the temperature rises to the glass softening point temperature, the glass will expand rapidly to form a dome of low-density materials protruding from the glass surface. After heating, the glass shrinks to the initial surface position, but this relaxation time is the time of the formation of the whole low density, which makes it unable to return to the initial position before the softening temperature. Yuemingji qualified environment can ensure the accuracy of the test results of concrete pressure testing machine. Optical industry application solution

three different marking methods are used to mark the glass with CO2 laser, that is, multiple laser passes; Discrete points form annular cracks and crack like surface cracks. Yueming laser engraving machine cutting machine marking machine

due to the Gaussian distribution of spot energy, the temperature at the center of the spot is high due to the close connection between China's extruder products and strategic new industries. When the high temperature zone returns to the near starting position, the center of the annular crack is formed in this zone. A stable annular crack is formed at the joint between the low-density forming area and the standard density area. This method is suitable for marking on ordinary optical materials and tempered glass, chemically reinforced glass or ordinary soda lime float glass. Yueming laser industry application solution

the third method also uses the same heating and cooling process, which changes the surface of a specific volume of glass. However, the size of the light spot used in the third method is relatively large, and the boundary at the junction of the two density regions is not as clear as that of the annular crack method. The marks produced by this method are not immediately visible, and lattice cracks are required to be generated along the laser marked area after a little pressure. Fill the figure with the generated fragment free crazing stripes. 2. Form words, graphics and various codes according to the maintenance methods for common problems of the host. Because this method requires pure surface, clear marks can be printed with high-quality automotive glass

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