Extrusion & Post
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PET stretch rod speed mismatch
Problem Phenomenon
Material accumulation at the bottle bottom or an excessively thin bottom alternately appears; after changing the stretch rod speed curve, the bottom thickness returns to stability.
Cause Analysis
Too fast a stretch rod speed causes the material to accumulate at the bottom before it can flow, and too slow a speed causes the bottom to be stretched thin; mismatch between the speed curve and the blowing timing amplifies bottom thickness fluctuations.
Solution
①Optimize the segmented setting of the stretch rod speed curve; ②match the stretching and blowing timing; ③measure the bottle bottom thickness distribution; ④fix the verified qualified parameter combination.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Stretch rod speed is the main control parameter for bottom material distribution; a segmented speed curve combined with blowing timing can precisely adjust the bottle bottom thickness and uniformity.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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