1. The influence of mold and iron core temperature: In the polyurethane pouring process, the temperature of the iron core and mold is required to be close to the temperature of the polyurethane raw material. When the temperature difference between the two is large, the curing speed of the material will be uneven, and the result will be greater internal stress after the curing of the polyurethane material.

2. Mold design requirements: mold design and manufacturing require good sealing, easy to close, open and demold. When designing molds, the heat balance of polyurethane must be considered, which is easily overlooked by manufacturers. Key factor. If the polyurethane coated wheel is unevenly heated during the high temperature vulcanization process, the polyurethane vulcanization is usually incomplete at the junction of the iron core and the polyurethane, the strength of the elastomer is low, or cracks appear.

3. The choice of adhesive: According to the adhesion theory, a molecular force can be formed between the surface of the polymer material with high molecular weight and the surface of the metal material, thereby forming a tight bond between the material and the metal.

4. Polyurethane formula: The manufacturer of polyurethane rubber-coated wheels should adjust the formula according to the operating conditions, such as load-bearing, rotational speed and use environment, so as to be more suitable for the operating conditions described by the customer.

5. The surface treatment of the iron core: the treatment of the iron core. The treatment of the cast iron roll core is also one of the keys to the core removal of the rubber roller. To produce a good combination of polyurethane elastomer and iron core, it is usually necessary to clean the iron core, such as pickling to remove rust and dirt, so that the surface is clean and free of dirt. Mechanical sandblasting is usually one of the methods for bonding strength.