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Practical answers to common plastic material challenges

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Q

PET edible oil bottle

A

Oil bottle whitening points to local loss of control of crystallization and orientation; the uniformity of the preform temperature field is the prerequisite for transparency; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post PET；oil bottle；whitening；crystallization；stretch orientation

Q

PET carbonated beverage bottle pressure resistance

A

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

Extrusion & Post PET；carbonated bottle；pressure resistance；IV；stretch ratio

Q

PET crystallinity control

A

Preform body crystallization is the great enemy of bottle blowing, and both temperature control and storage must guard against it; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a tr...

Extrusion & Post PETcrystallizationwhite spotsbottle blowing

Q

PET three-roll temperature matching

A

Three-roll temperature-speed matching is the key to sheet flatness; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems

Extrusion & Post PETthree rollsroll stickingflatness

Q

PET sheet roll temperature control

A

Sheet transparency is mainly determined by the roll temperature gradient and uniformity; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent sim...

Extrusion & Post PETsheetroll temperaturetransparency

Q

PET bottle shoulder stretching thin and rupture

A

Shoulder stretching thin is the result of mismatch between temperature and stretch design; concentration at an orientation indicates local heating or mold factors, which should be investigated in a targeted manner.; after confirming effectiveness, solidify the parameters and practices into the wo...

Extrusion & Post PET；bottle shoulder；stretching thin；rupture；stretch ratio；heating

Q

PET bottle bottom material accumulation too thick

A

Bottle bottom material accumulation is a manifestation of material distribution imbalance; stretching depth and blowing timing are the main adjustment means, and an overly thick bottom instead becomes the starting point of brittle cracking.; after confirming effectiveness, solidify the parameters...

Extrusion & Post PET；bottle bottom；material accumulation；thickness；stretching；distribution

Q

PET preform inventory aging and hardening

A

Preforms have a shelf life concept, and aged preforms require process compensation; inventory management and batch traceability are the basic guarantees for stable bottle blowing quality.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent r...

Extrusion & Post PET；preform；aging；inventory；IV；shelf life

Q

PET stretch rod speed mismatch

A

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 ...

Extrusion & Post PET；bottle blowing；stretch rod；speed；bottle bottom；thickness

Q

Abnormal PET polarized light stress lines

A

Polarized light inspection can see through the orientation and stress distribution of the bottle body; after establishing the baseline pattern of qualified products, abnormal stress lines can serve as a directional guide for process adjustment.; after confirming effectiveness, solidify the parame...

Extrusion & Post PET；bottle；polarized light；stress lines；orientation；inspection

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