Material Analysis
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Improper PET raw material IV grade selection
Problem Phenomenon
Carbonated bottles fail drop and internal pressure tests, and pass after switching to a high-IV grade; water bottles, however, show insufficient flowability.
Cause Analysis
Different applications have different IV requirements: carbonated bottles need 0.80~0.85 dl/g to ensure pressure resistance, while water bottles can use 0.70~0.75; selecting the wrong grade unbalances performance and processability.
Solution
①Select a matching IV grade according to product application; ②choose high IV for carbonated bottles and low IV can be chosen for water bottles; ③verify the processing window; ④test incoming material IV for confirmation.
Key Takeaway
IV grade selection is the first step in preform design; balancing application, performance, and processability, incoming material IV testing is a basic quality checkpoint.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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