In the field of light industrial machinery, such as printing machines, film machines and paper machines, as the equipment becomes larger, the roller is an important structural part. As the roller becomes larger, the material used changes from steel to composite material. In order to reduce the deflection and ensure the quality stability of the product. Because the deflection of the large-size roller becomes larger, it directly affects the stress in the length direction of the product, thereby affecting the stability of the product quality. In other words, the roller made of carbon fiber composite material has light weight, low inertia, high rigidity, high speed and small deflection, and has been widely used in light industrial machinery.
The physical properties of rollers made of different materials (same size) are relatively obvious, and the rollers made from CFRP have the characteristics of light weight and small deflection. As far as carbon fiber is concerned, ultra-high modulus pitch-based carbon fiber is more suitable for making rollers. Because its specific modulus is larger than that of PAN-based carbon fiber, and it is more rigid. Comparison of the performance of asphalt-based CFRP rollers and steel rollers. Obviously, when the length of the two rollers (8m) is the same, the CFRP roller has a small diameter, a thin wall and a weight reduction of about 87%, and the total deflection is still relatively small, which is a typical light weight, high rigidity and low deflection. Roller. If the two rollers are of the same thickness and thickness, the rigidity of CFRP will be greater. Therefore, the ultra-high modulus pitch-based graphite fiber composite is one of the best materials for manufacturing large rollers. The light and rigid large-size roller made of high modulus pitch-based graphite fiber can realize high-speed rotation under the action of low driving force, saving electricity and energy. At the same time, it is light in weight, low inertia, easy to start and brake; high rigidity, low deflection, always maintain high precision during operation, and ensure the stability of product quality.
In the roller of the CFRP embryo, the surface of the roller should be modified by spraying to improve its wear resistance and impact resistance. First, blow a resin that can be cured at room temperature, such as polyurethane, on the embryo body CFRP 5. After that, the rotary table is processed to make the surface roughness Ra of 10-20μm, and then galvanized on 4, the thickness is about 100m, and finally 200m of WC is sprayed to improve the wear resistance of the surface. After multiple spraying, the interface bonding force can reach 55kgf/cm2. Such rollers have been running for one year during papermaking, and no peeling and delamination of the skin layer has been found, and the surface layer wear is extremely small. CFRP rollers have been widely used in practical applications.