Over the years, the production of rubber rollers has made the mechanization and automation of process equipment difficult due to the instability of products and the diversity of size specifications. So far, most of them are still manual-based discontinuous unit operation production lines. Recently, some large professional manufacturers have begun to realize continuous production from rubber materials to molding and vulcanization processes, which has doubled the production efficiency and greatly improved the working environment and labor intensity.
In recent years, the technology of injection, extrusion and winding has been continuously developed, and the rubber roller molding and vulcanization equipment has made the rubber roller production gradually mechanized and automated. The performance of the rubber roller has a huge impact on the whole machine, and it is extremely strict on the process operation and production quality. Many of its products have been classified as fine products. Among them, the selection of rubber and plastic materials and the control of product dimensional accuracy are the key. The rubber surface of the rubber roller is not allowed to have any impurities, blisters and bubbles, let alone scars, defects, grooves, cracks and local sponges and different soft and hard phenomena. For this reason, the rubber roller must be absolutely clean and meticulous in the entire production process, so as to realize the unified operation and technical standardization. The process of combining rubber plastic and metal core, pasting, injection molding, vulcanization and grinding has therefore become a high-tech process.
Rubber preparation
For rubber rollers, the mixing of rubber is the most critical link. There are more than 10 kinds of rubber materials for rubber rollers ranging from natural rubber and synthetic rubber to special materials. The rubber content is 25%-85%, and the hardness is soil (0-90) degrees, which spans a wide range. Therefore, how to mix these compounds uniformly has become a big problem. The conventional method is to use an open mill for mixing and processing in the form of a variety of master batches. In recent years, companies have increasingly switched to intermeshing internal mixers to prepare rubber compounds by means of segmented mixing.
After the rubber material is uniformly mixed, the rubber should be filtered with a rubber filter to eliminate impurities in the rubber material. Then use a calender, an extruder, and a laminating machine to make a film or strip without bubbles and impurities for the rubber roller forming. Before forming, these films and adhesive strips must be subjected to strict appearance inspections to limit the parking period, maintain a fresh surface and prevent adhesion and extrusion deformation. Because most of the rubber rollers are non-molded products, once there are impurities and bubbles on the surface of the rubber, blisters may appear when the surface is ground after vulcanization, which will cause the entire rubber roller to be repaired or even scrapped.
Post time: Jul-07-2021
