Shrinkage of molded plastic parts can be as much as 20% by volume when measured at process and room temperature. This volumetric contraction of polymers often results in warpage of parts and dimensional differences. These changes occur between the manufactured parts and the mold.
2.How to calculate the shrinkage rate to ensure the durability of the final product?
It is important to predict shrinkage before production to avoid costly and time-consuming tooling adjustments. All plastics have a minimum and maximum shrinkage percentage, but all other elements that affect shrinkage rate must be considered. The best method for calculating shrinkage rate is to design a prototype tool to simulate the iran number data cooling conditions and gating specifications used in the manufacturing process. Not only will this provide an accurate measurement of shrinkage, but it will also provide the ability to adjust the tooling before the manufacturing process if any defects occur. Determining shrinkage rate in plastic injection molding is vital to maintaining optimized production.
· Length differences caused by thermal expansion and cold contraction in polymers
When an injection mold needs to be made, it is important to melt the raw plastic components. At this stage, the melting process temperature rises to 200-300 degrees, and the raw plastic components heat up and expand. The temperature of the injection mold will decrease as the cooling process progresses, which will lead to a possible reduction in its volume.