Molds & Tooling
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Trapped gas burning of PP products
Fenómeno do problema
Burnt marks appear at the end of the material flow, which are eliminated after venting improvement.
Análise das causas
The venting at the end of the cavity is poor, and the air is adiabatically compressed and burns the melt; high-speed filling makes trapped gas more serious.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solução
①Open vent grooves at the end; ②reduce the injection speed; ③clean the blocked vent grooves; ④optimize the gate position.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Conclusão principal
The location of trapped gas burning is the point to add venting; venting design for thin-wall high-speed parts should be considered in advance.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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