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4 reasons for the use of polyurethane coated wheel degumming

4 reasons for the use of polyurethane coated wheel degumming  
  Leading factor one: the choice of adhesive  
  Coordination bonds and van der Waals forces can be formed between the polymer material with high molecular weight and the surface of the metal material, so that the material and the metal can form a tight bond.  
 Causing factor two: iron core processing  
 To produce a good bond between the polyurethane elastomer and the 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.   
Leading factor three: mold design and demoulding requirements  
  When designing and manufacturing molds, it is required to have better sealing properties, easy to close, open and release the film. When designing a mold, the heat balance of polyurethane should also be considered, which is an important factor that is easily overlooked by manufacturers. If the rubber roller 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.   
Leading factor four: the influence of mold and iron core temperature  
In the polyurethane material liquid casting process, the temperature of the iron core and mold is required to be close to the temperature of the polyurethane material liquid. 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.