When manufacturing polyurethane screen mesh, it is important to control the temperature to ensure proper usage, which will improve the quality of the final product.
If the temperature is not controlled properly during manufacturing, it can affect the durability of the product during usage.
The optimal method for cooling polyurethane screen mesh is to remove it from the heating furnace and pre-cool it in the air before placing it in a cooling agent. Quenching in the cooling agent is an effective method to reduce deformation and cracking tendencies in parts.
After placing the mold in the cooling agent, it should be properly rotated and the temperature of the PU screen mesh should be controlled. The direction of rotation should be changed to ensure even cooling rates in all areas, which reduces deformation and prevents cracking.
The heating temperature for quenching polyurethane screen mesh should be confirmed to avoid coarsening of austenite grains, oxidation, decarburization, deformation, and cracking tendencies that result from overheating.
When heating polyurethane screen mesh within a specific temperature range, if the temperature is too low, it can cause shrinkage in inner pores. Thus, it is preferable to use the upper limit of the heating temperature range.
For alloy steel materials, if the temperature is too high during heating, it can cause an expansion in inner pores, resulting in increased pore size. Therefore, it is preferable to use the lower limit of the heating temperature range.
After removing the polyurethane mesh from the cooling agent, do not wait for an extended period of time in the air: it should be quickly placed in a tempering furnace. During tempering, it is important to prevent low-temperature or high-temperature embrittlement.
For high-precision PU screen mesh, multiple tempering treatments can be performed after quenching to reduce stress and minimize deformation.
For polyurethane vibrating screen that requires wire cutting, multi-step quenching and tempering treatments should be applied prior to wire cutting to improve the quenching penetration of the material and ensure even distribution of internal stress, resulting in better performance.
In summary, it is important to control the usage temperature of polyurethane screen mesh during manufacturing to improve its durability and minimize damage in subsequent usage.