Product Cracking/Cracks

Cracks appear inside or on the surface of the product. Cracks may appear on the product surface or inside, and in severe cases penetrate the entire wall thickness, mostly exposed during demolding or post-processing.

(1) In terms of shrinkage control: the internal stress generated by curing shrinkage exceeds the material strength, uneven volume shrinkage leads to internal stress and dimensional deviation. (2) In terms of stress distribution: stress concentration at the transition between thick and thin walls, internal stress concentration causes the product to crack or deform during subsequent use. (3) Process factors: external impact during demolding, this factor affects the product's '2079851475616104453 and final quality. (4) In terms of process speed: the cooling rate is too fast, speed parameters affect the synchronization of material flow state and reaction progress.

(1) Implementation measures: avoid sharp angles and abrupt wall thickness changes in product design, formulate a specific operation plan based on actual production conditions and verify the implementation effect. (2) Process control: control the cooling rate, establish an online monitoring mechanism, set upper and lower parameter limits, and implement alarm management. (3) Formula optimization: add toughening agents or flexible segments, determine the optimal addition amount through small-batch tests and verify its impact on the comprehensive performance of the product. (4) Implementation measures: handle with care during demolding operations., formulate a specific operation plan based on actual production conditions and verify the implementation effect. (5) Preventive measures: establish an internal stress inspection system, perform annealing treatment on key products, and regularly inspect the condition of products in storage.

The essence of cracking is that the internal stress exceeds the material strength limit, and it needs to be addressed from two aspects: reducing stress concentration and improving material toughness.