Product warpage

Foam products show bending deformation after demolding. Deformation usually gradually intensifies after demolding, especially in asymmetric structures or parts with large wall thickness differences.

(1) Shrinkage control aspect: uneven foaming density causing different shrinkage rates in various parts; uneven volume shrinkage causes internal stress and dimensional deviation. (2) Shrinkage control aspect: uneven cooling causing anisotropic shrinkage; uneven volume shrinkage causes internal stress and dimensional deviation. (3) Temperature parameter aspect: uneven mold temperature or uneven product temperature at demolding; temperature deviation directly affects the physicochemical state and reaction progress of the material.

(1) Implementation measures: ensure uniform filling and foaming of the foaming material; formulate specific operation plans based on actual production conditions and verify implementation effects. (2) Implementation measures: after demolding, place the product on a setting jig for cooling; formulate specific operation plans based on actual production conditions and verify implementation effects. (3) Process control: control mold temperature uniformity., establish an online monitoring mechanism, set parameter upper and lower limits and implement alarm management. (4) Preventive measures: perform shrinkage and warpage simulation analysis during the product design stage to optimize structure and process plans in advance.

Deformation problems originate from internal stress caused by uneven shrinkage or heating in various parts of the product, and need to be systematically solved from three aspects: structural design, process parameters, and post-treatment.