The reason why stone is loved by people, in addition to the charming natural color and hard texture, crystal clear luster is always the people’s favorite. People always pursue the high luster of stone, because the higher stone luster will show the nobleness and grandeur of the stone. However, the understanding and evaluation of the luster of the stone is relative.
The same kind of stone, grinding and polishing equipment and materials, the gloss is not the same; the same equipment and materials, will also get different luster in different stone varieties; in addition, the gloss of the stone and processing The environment and skills have a big relationship. Therefore, how to improve the polishing technology and effect of stone has been a subject of constant efforts in the industry.
The links and processes related to stone grinding and polishing can be divided into factory grinding and polishing and maintenance grinding, or large grinding and small grinding. Of course, due to some factors, some small equipment and tools are used in the factory to polish and polish the stone. We call it a small polishing.
For example, repair of broken sheets, processing of irregular shapes, processing of lines, and the like. Maintenance of grinding and polishing refers to reprocessing the stone gloss during the installation and application of the stone.
First, the significance of improving the gloss effect of stone reprocessing
In the different stages of stone application, there will be requirements for small polishing or re-polishing of the stone part or whole according to the needs. For example, in the case of grinding and polishing a small area of stone, like in the case of repairing the board, the sheet is trimmed. In the case of the restoration of the surface gloss of the stone, as in the case of refurbishing the surface of the stone.
In these cases, the grinding and polishing of the stone is difficult to obtain a gloss which is consistent with or higher than that of the large plate or the original surface due to the restriction of equipment and materials.
Stone application is a systematic project, we emphasize the consistency of stone gloss.
Due to individual sheet or partial treatment, these individual local gloss drops can affect the coordination and consistency of the overall effect.
The overall grinding and refurbishment of the floor may also be less than the original effect. The marble countertops will also have the requirement to restore gloss due to local wear or acid corrosion. Although these conditions are a very small part of the overall application of stone, the effect will be very high attention, and these are also places that reflect details and meticulousness, and are also prone to disputes. Therefore, the restoration of the local luster of the stone and the improvement of the regrind and polishing are very important for the overall improvement of the effect of the stone.
Second, the current market situation of small grinding materials and technology
For the local grinding and polishing of stone, these small grinding and polishing processes, the existing equipment and materials are still relatively old, or extend the angle grinder, polishing pad and wax. It is difficult to obtain a good gloss effect by using these tools and materials, and the trace of luster is obvious, and the effect is not durable. These treated parts and parts tend to attract people’s attention and have a greater impact on the evaluation of effects.
As for the overall grinding and refurbishment of the stone floor, due to the increase in business volume in recent years, people have made great changes in equipment renewal and material investment. The refurbishment equipment has greatly improved in terms of power, gravity and speed. The matching grinding and polishing materials have also undergone major changes in types and performance, and are also more specialized and serialized.
For the gloss treatment of the profile and the line, although the existing equipment will give it a better luster, the seams and the like are still handled manually by people. Although there are some products such as hand-powder on the market, they are rarely used for reasons of efficiency and efficiency. So we still often see that wax is still a frequent choice for people under these conditions.
Third, stone polishing method
Polishing principle of stone products: The beauty of decorative stone, in addition to the color of the product, is mainly reflected in the gloss of the product, so the polishing of the product is an important and key link. How to polish the product to achieve the best effect, first of all, to understand the polishing Materials, methods, principles.
The polishing materials are mainly chromium oxide (Cr2O3), white corundum, alumina (Al2O3, 0.3um, VK-L30F), oxalic acid (COOH2).
There are two types of polishing stones: resin polishing blocks; resin polishing disks.
Polishing of the product: placing the polishing stone on the processed product, using the mechanical equipment to run quickly and dry polishing, wet polishing to achieve the polishing effect, the surface of the product will have a strong reflected light, which is commonly known as gloss .
The principle of polishing is mainly reflected in two aspects: the principle of particle grinding; the principle of physical chemistry.
1. Microparticle grinding: When the abrasive particles are coarsely ground to finely ground and polished, the traces of the abrasive on the surface of the stone are traced from coarse to fine to no visible to the naked eye, and the surface is smooth, smooth and delicate. When it reaches 110 microns, the surface of the processed surface has a specular gloss, which is radiant and bright.
Particle grinding consists of the following processes:
1 Rough grinding: requires the grinding tool to have a deep knife, high grinding efficiency, rough grinding, and rough surface. It mainly removes the traces of the saw blade left in the previous process and flatten the product. , the molding surface is ground in place;
2 semi-fine grinding: the coarse grinding marks are removed to form a new thinner grain, and the processing surface of the product is smooth and smooth;
3 fine grinding: the finely ground product pattern, granules and color have been clearly displayed, the surface is fine and smooth, and begins to have a weak gloss;
4 Fine grinding: After processing, there is no trace of the naked eye. The surface is getting smoother and the gloss is about 40~50 degrees;
5 Polishing: This step is the most important place for light extraction. Generally, it needs to be processed with alumina mirror polishing powder (VK-L30F) of about 0.3um. The surface of the treated stone is bright as a mirror and has a certain specular gloss. 85 degrees or more).
2, physical and chemical principles: polishing process has two, namely “dry and wet polishing”, polishing stone between “dry and wet” when the physical and chemical effects of stone products, dry polishing is the temperature of the stone surface Evaporation of water leads to an increase in the concentration of the polishing grindstone, thereby achieving a strengthening effect, and the gloss of the product begins to meet the desired requirements, and the gloss is above 85 degrees or higher.
The polishing stone is polished on the processed product. After the polished product is hot, add water to the surface to reduce the temperature. It is not allowed to add water or add a large amount of water. Otherwise, the lubrication of the water will make the polishing less than Ideally, dry polishing cannot be used all at all. Excessive temperatures can burn the surface and crack the surface.
Generally speaking, after the product is finely ground, the gloss of the product is about 40~50, and some stones can not reach the above gloss after fine grinding, such as Shanxi black, black gold sand, Jining black, etc. The gloss is only between 20 and 30 degrees. It is explained by the principle of particle grinding in the front. This product is dry and wet, the temperature rises, the temperature is lowered, the polishing process is strengthened, and the physical and chemical reaction occurs. After dry polishing and wet polishing, the gloss is gradually increased, and the gloss is more than 85 degrees.