Molds & Tooling
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PBT Gas Burning
Problem Phenomenon
Gas burning at the end of the product, discoloration at the corresponding mold position, short-term improvement after vent cleaning
Cause Analysis
During high-speed filling of PBT, the air in the cavity is adiabatically compressed, heats up, and burns; the vents are insufficient or blocked by mold deposit; strengthening the vents and reducing speed are the combined countermeasures; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Strengthen the vent design; ②Reduce the end-stage injection speed; ③Regularly clean the vents to prevent mold deposit blockage; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT gas burning gives priority to venting; PBT's characteristic of heavy mold deposit makes vent cleaning a high-frequency maintenance item; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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