How to solve the shrinkage and deformation problems of plastic mold during the molding process?
Publish Time: 2025-02-17
During the molding process of plastic mold, due to the combined effect of multiple factors, shrinkage and deformation problems are often encountered. These problems not only affect the appearance quality of the product, but may also reduce the functionality and service life of the product. Therefore, solving the shrinkage and deformation problems during the molding process of plastic mold is of great significance to improving product quality and production efficiency.
First of all, to solve the shrinkage problem, it is necessary to pay attention to the selection and processing of raw materials. The shrinkage rate of raw materials is one of the main factors affecting the shrinkage of products. Therefore, when selecting raw materials, materials with smaller shrinkage rates should be given priority. At the same time, sufficient drying and preheating of the raw materials can reduce their shrinkage rate during the molding process. In addition, reasonable control of molding temperature is also the key to reducing shrinkage. Too high or too low temperature will lead to an increase in shrinkage, so the molding temperature needs to be accurately set according to the characteristics of the raw materials and the design of the mold.
Secondly, mold design is crucial to solving the shrinkage and deformation problems. The gate size, position and number of the mold will directly affect the flow and cooling of the plastic melt. Reasonable gate design can ensure that the plastic melt fills the mold cavity evenly and quickly, reducing shrinkage and deformation caused by flow resistance and uneven cooling. In addition, the cooling system of the mold also needs to be carefully designed to ensure that the plastic can be cooled evenly and quickly during the molding process, thereby reducing the risk of shrinkage and deformation.
In terms of molding process, the control of injection pressure, holding time and cooling time is equally important. Appropriate injection pressure and holding time can ensure that the plastic melt is fully compacted and held in the mold cavity, reducing shrinkage and internal stress. Reasonable cooling time allows the plastic to fully solidify in the mold to avoid deformation caused by the release of internal stress after demolding.
Finally, the demolding process also needs attention. When demolding, it should be ensured that the product has been completely cooled and solidified to avoid deformation caused by external forces during the demolding process. At the same time, the demolding slope of the mold also needs to be reasonably designed to ensure that the product can be smoothly removed from the mold without damage.
In summary, solving the shrinkage and deformation problems of plastic mold during the molding process requires starting from multiple aspects such as raw material selection, mold design, molding process and demolding process. By comprehensively considering these factors and taking corresponding measures, the shrinkage and deformation of the product can be effectively reduced, and the product quality and production efficiency can be improved.
