PETform


Precision Tools for PET Packaging

TROUBLE SHOOTING BLOWING PROCESS

Problem :
Haze
Possible Causes : IV too low, Preform too hot, Low level crystallinity in preform

Problem : Pearlescence
Possible Causes : Preform too cold, Insufficient soak time, Improper preform design

Problem : Pearlescence in a Particular Section
Possible Cause : Affected section too cool

Problem : Thin Sidewalls
Possible Causes : Preform too hot, IV too low, excessive preform moisture, improper heating profile

Problem : Heavy neck area
Possible Causes : Preform too hot, IV too low, excessive preform moisture, improper heating profile, too much heat in bottom area, pre-blow air starting too early

Problem : Shelf life failure
Possible Causes : Preform too hot, IV too low, Excessive preform moisture, Improper heating profile

Problem : Heavy bottom area
Possible Causes : Preform too hot, IV too low, Excessive preform moisture, Improper heating profile, Too much heat in top area, pre-blow air starting too late

Problem : Drop Test Failure
Possible Causes : Preform too hot, IV too low, Excessive preform moisture, Improper heating profile, Too much heat in top area, Preblow air starting too late, Excessive gate crystallinity in preform

Problem : Top Load Failure
Possible Causes : Preform too hot, IV too low, Excessive preform moisture, Improper heating profile, Too much heat in top area, Preblow air starting too late

Problem : Creep
Possible Causes : Preform too hot, IV too low, Excessive preform moisture.

Problem : Localized Surface Imperfections
Possible Causes : Water in blow air, Contamination, Small un-melts in preforms

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