Injection Molding
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Ejector whitening in demolding of PET injection molded parts
Fenómeno do problema
White spots or cracks appear at ejection positions of PET products, especially obvious in transparent products.
Análise das causas
Ejection force is too large or the ejector pin area is too small, causing excessive local stress; draft angle is insufficient; mold temperature is on the high side and rigidity is insufficient.
Solução
Increase ejector pin area or number to disperse ejection force; increase draft angle to ≥2°; extend cooling time.
Conclusão principal
PET ejector whitening is the result of local stress exceeding material strength.
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