Extrusion & Post
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PET carbonated beverage bottle pressure resistance
Problem Phenomenon
The carbonated bottle bursts in the pressure resistance test, the bottom cracks, and the drop test fails
Cause Analysis
Insufficient IV value makes the bottle body strength inadequate; the bottom design has stress concentration; an improper stretch ratio makes the orientation insufficient, and pressure resistance and drop performance are both impaired; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Verify the raw material IV value according to the carbonated bottle standard; ②optimize the bottom petal structure to disperse stress; ③optimize the stretch ratio and blowing pressure for orientation; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The pressure resistance of a carbonated bottle is a ternary function of IV, structure, and orientation; any shortfall is exposed in the pressure test; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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