Molds & Tooling
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ABS brittle cracking——improper mold temperature and cooling
Fenómeno do problema
Thick-wall parts or high-melting-point modified ABS crack at weld lines and thick-wall areas, clearly related to the mold temperature setting.
Análise das causas
When the mold temperature is too low, the melt cools quickly after entering the cavity, the weld line fusion is poor, the molecular chains cannot be fully integrated, and the product (especially thick-wall parts and high-melting-point modified ABS) is prone to brittle cracking; when the mold temperature is too high, the cooling is uneven and the ejection stress is large, which also introduces brittleness.
Solução
①Adjust the mold temperature to a reasonable range of 40~80℃ according to the product thickness, appropriately increase for thick-wall parts and appropriately decrease for thin-wall parts; ②optimize the cooling system to ensure uniform cooling and eliminate local hot and cold spots; ③ensure the temperature at the weld line to improve fusion; ④balance cooling and cycle.
Conclusão principal
ABS mold temperature should be set 'differentiated' according to wall thickness: raise the temperature for thick walls to ensure welding, lower the temperature for thin walls to prevent deformation; mold temperature is neither the higher the better nor the lower the better, uniformity and matching are the key.
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