Problem & Solution

Practical answers to common plastic material challenges

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Q

PET sheet gel particles and impurities

A

The root of gel particles lies in the material, not the machine; raw material purity management plus process filtration is the quality bottom line of transparent PET sheet; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying PET;gel particle;regrind;raw material purity;filtration

Q

PET sheet haze and poor transparency

A

PET transparency is the product of multiple factors; any loss of control of the four variables—moisture, degradation, impurities, and crystallization—will cause haze; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying PET;sheet;haze;transparency;crystallization

Q

PET sheet yellowing and degradation

A

PET sheet yellowing has three independent sources: temperature, residence, and regrind; during troubleshooting, verify and locate item by item in this order; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying PET;sheet;yellowing;thermal degradation;regrind

Q

PET sheet bubbles and moisture

A

Ninety percent of PET sheet bubbles can be traced back to moisture; drying, venting, and filtration are three lines of defense, and drying is the first and most important one; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying PET;sheet;bubble;vacuum venting;filtration

Q

PET coffee machine part

A

Hot water parts must be selected with hydrolysis-resistant materials; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future

Material Drying PETcoffee machinehot waterhydrolysis

Q

PET photovoltaic backsheet

A

Photovoltaic backsheets require composite protective structures; bare PET is not weather-resistant; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar ...

Material Drying PETphotovoltaic backsheetyellowingcomposite

Q

PET hydrolysis resistance boundary

A

PET's hydrolysis sensitivity defines the application boundary; in material selection review for hot and humid scenarios it should be vetoed outright, switching to hydrolysis-resistant materials; after confirming effectiveness, solidify the parameters and practices into the work instruction to pre...

Material Drying PET；hydrolysis resistance；hot and humid；cracking；material selection

Q

PET regeneration drying management

A

The molecular sieve is a consumable, and its life is managed by the dew point indicator; 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...

Material Drying PETmolecular sieveregenerationdew point

Q

PET dryer selection

A

PET drying systems must be specially selected according to process parameters; 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

Material Drying PETdryerselectioncrystallization

Q

PET vented extrusion drying

A

Vented extrusion is a supplement, not a replacement, and bottle grade must be pre-dried; 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...

Material Drying PETvented extrusionpre-dryingbottle grade

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