Uneven density transition between skin and core layer

The density change between the skin and the core layer is too steep, producing a weak interface bonding zone. Density differences are evident between different parts of the product, affecting the overall performance consistency of the product.

(1) Temperature parameter aspect: excessive difference between mold temperature and material temperature; temperature deviation directly affects the physicochemical state and reaction progress of the material. (2) Process factor: foaming reaction front advancing too fast; this factor affects the '2079851475616104453 and final quality of the product. (3) Process aspect: uneven pressure transmission or insufficient holding pressure causing densification differences in various parts. (4) Material aspect: filler settling or component segregation causing local density abnormality. (5) Operation aspect: uneven feeding or improper filling sequence.

(1) Design optimization: optimize mold temperature and reaction speed to make the transition gradient gentle; combine process simulation analysis or mold trial verification to continuously iterate and improve the design plan. (2) Formulation optimization: add components that improve compatibility to the formulation., determine the optimal addition amount through small-batch tests, and verify the impact on the comprehensive performance of the product. (3) Process optimization: increase preforming pressure and maintain sufficient holding time to ensure uniform densification of all parts. (4) Operation improvement: optimize the feeding method to ensure uniform filling, using vibration-assisted feeding when necessary. (5) Preventive measures: establish a raw material batch inspection system, regularly sample product density and mechanical properties, and establish quality trend analysis.

The essence of uneven density is inconsistent distribution or densification of the material during the '2079851475616104453; the feeding method and pressure transmission need to be optimized.