News

Mirror-grade finish: Ra 0.01–0.05 μm. Semi-mirror-grade finish: Ra 0.1–0.2 μm. When surface roughness exceeds these specified limits, the finished product may exhibit surface defects such as bright spots, ripples, or a hazy/matte appearance; polishing is then required to restore the surface to its original specifications.

The purpose of the rough grinding stage is to remove large scratches, oxide layers and other obvious stains on the surface of the industrial chrome plated roller. Use coarser sandpaper (such as 200 mesh or lower) and a polishing machine for preliminary grinding.

The melting point of chromium is 1907°C, which means that the chrome plating can remain solid below this temperature and will not melt. However, in industrial applications, the operating temperature of the roller is usually much lower than this melting point, so the chrome plating rarely faces the risk of melting in actual use.

Industrial chrome roller refers to roller equipment that is plated with a uniform layer of chrome on the surface of the roller body through an electroplating process. The thickness of this chrome coating is generally between a few microns and hundreds of microns, depending on the specific application requirements. Non-chrome rollers are roller equipment that has not been electroplated with chrome.

For chrome plated rollers for general industrial use, the thickness of the chrome plating layer is usually required to be between 20-50 microns. This thickness is sufficient to provide good wear resistance and corrosion resistance and is suitable for most conventional processes.

Compared with other types of rollers, industrial chrome-plated rollers can operate at higher speeds without affecting the matting effect of paper due to their excellent smoothness and wear resistance.

By increasing the current density, the grains of the chrome-plated layer can be made finer, thereby improving the hardness. However, it should be noted that excessively high current density may cause the surface of the coating to be rough or cracked, so fine adjustment is required.

Hydrochloric acid is a strong acid and is highly corrosive. Although the chromium oxide layer can resist the erosion of hydrochloric acid to a certain extent, under conditions of high concentration and high temperature, hydrochloric acid can effectively dissolve the chromium metal and its oxide layer, causing damage to the chrome plating layer.

In theory, the chrome layer will not fade under most working conditions. The stability of chrome metal itself is extremely high, and the chromium oxide layer on its surface can effectively prevent the external environment from corroding the chrome layer. Therefore, the chrome layer can usually maintain its original luster and color for a long time and is not easy to fade.

The hardness of the chrome plating layer of industrial chrome-plated rollers is usually between 800 and 1000 Vickers hardness (HV). This hardness range depends on the specific conditions of the chrome plating process, including current density, temperature, plating solution composition, etc.