FAQ on Cracking Issues in Clay Fired Brick Production

Q1： Are cracks in green bodies and finished bricks common issues?
Yes, cracks frequently occur during brick production and are one of the major technical challenges affecting product qualification rates. 

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Q2：At which production stages do cracks typically occur? Cracks may appear during the following stages:
1.Raw material preparation
2.Green body forming
3.Drying process
4.Sintering process
5.Cooling after sintering

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Q3：What are the specific types of cracks?
Common types of cracks include:
1.Raw material cracks
2.Forming cracks
3.Drying cracks
4.Sintering cracks
5.Cracks from rapid cooling

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Q4： How to accurately identify at which stage cracks form?
Methods include:
1.Observe patterns: If no cracks after drying but cracks after sintering, the issue likely lies in the firing stage.
2.Sectional inspection: Examine products step by step to locate where cracks first emerge.
3.Comprehensive analysis: Assess moisture, structure, and process parameters as a whole. 

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Q5：Do cracks from different stages share common causes?

Yes, the root cause is stress concentration generated during various processes, which, if not properly managed, eventually leads to cracks. 

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Q6：How to systematically reduce cracks?

Implement full-process control:
1. Optimize raw material formulation
2. Control forming moisture and vacuum levels
3. Design scientific drying curves
4. Regulate heating rates precisely
5. Optimize cooling processes
6. Continuously monitor and adjust production parameters

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Q7：Is there a unified theory to control cracks?
Yes, the essence of crack control is stress management theory, which emphasizes coordinated process control to minimize stress concentration and crack formation. 

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Q8：What are typical misconceptions in handling cracks?
1.Focusing solely on firing, neglecting earlier process stages
2.Chasing output blindly, ignoring structural stress balance
3.Lack of systematic optimization and targeted process adjustments 

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Q9：Summary Recommendations:
1.Strengthen full-process quality awareness
2.Focus on synergy between raw materials, forming, drying, and sintering
3.Identify stress sources scientifically and resolve them precisely
4.Avoid relying on single-stage fixes, promote systematic improvements