Internal stress of ultra-thick laminates causes "spontaneous delamination"

Thick boards delaminate internally on their own after several weeks of storage. The interlayer separation phenomenon gradually expands after the product is subjected to force or environmental action, seriously affecting structural integrity.

(1) Process time aspect: Internal stress accumulated during lamination cooling is slowly released over time, Improper time control causes the reaction or cooling process to fail to meet process requirements, affecting the final performance of the product. (2) Process factor: Peeling occurs at a certain weak interlayer, This factor affects the '2079851475616104453 and final quality of the product. (3) Interface aspect: Insufficient interlayer bonding force, inadequate resin impregnation, or the resin has gelled and lost tack. (4) Process aspect: Interlayer contamination or insufficient temperature/pressure causes the interface to not fully fuse. (5) Material aspect: Poor compatibility between the resin and the reinforcement material surface.

(1) Post-treatment: Perform sufficient annealing treatment after lamination to release internal stress, Develop a reasonable post-treatment temperature profile to eliminate internal stress and stabilize product dimensions. (2) Implementation measure: Avoid rapid cooling, Develop a specific operation plan based on actual production conditions, and verify the implementation effect. (3) Implementation measure: Laminate thick boards in stages., Develop a specific operation plan based on actual production conditions, and verify the implementation effect. (4) Preventive measure: Establish interlaminar bond strength inspection standards, regularly sample interlaminar shear strength, and monitor process parameter stability.

The essence of the interlayer separation problem is insufficient interfacial bonding force; it needs to be systematically improved from three aspects: impregnation quality, interlayer cleaning, and process parameters.