Rotomolding Products May Undergo Cooling Shrinkage And Deformation And There May Be Certain Errors In Size

1. Optimize cooling methods

Choose appropriate cooling intensity: Try to choose a method with low cooling intensity to avoid uneven shrinkage caused by too fast cooling rate. Although fan cooling is faster than room temperature cooling, it should be used with caution to avoid aggravating shrinkage and deformation.

Uniform cooling: During the cooling process, the rotation of the mold should be maintained to ensure that all parts of the product are cooled evenly. For products with large thickness differences, local air cooling or local reheating can be used to adjust the temperature difference to avoid large deformation.

2. Control the demoulding temperature

Extend the cooling time in the mold: A longer cooling time in the mold can reduce the shrinkage rate.

Control the demoulding temperature: On the premise of ensuring easy demoulding, the lower the demoulding temperature, the better, so as to minimize the risk of shrinkage and deformation.

3. Adjust process parameters

Adjust the rotation speed of the main and auxiliary shafts: Make the rotation speed ratio balanced and the rotation speed uniform, which will help the wall thickness of the molded products to be uniform, thereby reducing shrinkage and deformation.

Improve the heating process: Appropriately increasing the heating temperature can improve the density of the product and help reduce shrinkage and deformation during the cooling process.

4. Optimize mold design

Correct the mold structure: Correct the structures, narrow spaces, sharp angles, etc. in the mold that may cause shrinkage and deformation of the product to reduce the risk of deformation.

Keep the mold vents clear: If necessary, inert gas can be introduced into the mold to improve the temperature distribution and cooling effect inside the product.