Full definition
Belt cement is a specialized adhesive primarily used in the repair and maintenance of conveyor belts, particularly in patching cuts, tears, and gouges, as well as in cold splicing applications. This adhesive plays a crucial role in ensuring the longevity and reliability of conveyor systems, which are essential in various industrial operations. There are two main categories of belt cement: contact cement and rubber solution. Contact cement, often referred to as cold vulcanizing cement, is a single-component, solvent-based adhesive that is applied to both surfaces that require bonding. After application, it is allowed to dry until it becomes tacky, at which point the surfaces are pressed together. The typical cure time for contact cement ranges from 4 to 12 hours, and it can achieve 60-80% of the original belt strength upon curing.
The second category, rubber solution, is used specifically in hot vulcanizing splices, serving as the bonding layer between the splice rubber and the belt carcass. This type of cement is activated by heat and pressure applied during the vulcanizing process, allowing for a more permanent and robust bond. The application procedure for belt cement involves several meticulous steps: first, the repair area must be thoroughly cleaned and buffed to remove damaged rubber down to sound material. Next, a conditioner or primer is applied to enhance adhesion, followed by the application of the cement in thin coats — typically 2 to 3 layers, with drying time allowed between each layer. Once the final layer is applied, repair rubber or patches are placed, and a stitcher is used to roll out any trapped air, ensuring a strong bond. Full cure of the adhesive is necessary to achieve optimal performance.
Leading systems for belt cement include recognized brands such as Rema Tip Top, which utilizes TIP TOP SC 2000 cement combined with CUT TIP hardener, as well as Beltwin, Almex, and Fenner Dunlop. While applying belt cement, it is crucial to adhere to the procedures outlined in ISO 15236, ensuring that the splicing and repair processes meet industry standards. Proper storage is also essential; belt cement should be kept below 25°C and away from heat and flame sources to maintain its effectiveness and safety.