Problem & Solution

Practical answers to common plastic material challenges

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Q

PET sheet edge cracking

A

PET sheet edges are weak zones of stress and thickness; a three-pronged approach of cooling, tension, and thickness prevents edge cracking and web breaks; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post PET;sheet;edge cracking;internal stress;winding tension

Q

PET sheet uneven thickness

A

Sheet thickness is a comprehensive indicator of extrusion stability; three-ring calibration of pressure, die, and roll system plus online thickness measurement is the standard configuration; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recu...

Thermoforming PET;sheet;thickness;die lip;thickness measurement

Q

PET sheet black specks and impurities

A

PET sheet black specks are a zero-tolerance defect; only the trinity of equipment cleaning, temperature management, and filtration interception can eradicate them; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Processing Machinery PET;sheet;black speck;carbonization;filter screen

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 shear rate and brittleness

A

PET shear embrittlement is a hidden defect; 3-5 second shot time is the empirical upper limit, and impact sampling is the fallback verification; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding PET;shear rate;embrittlement;3-5 seconds;impact

Q

PET pressure-adjusted flow characteristics

A

PET is a pressure-sensitive material; adjusting pressure rather than temperature is the basic logic of '2079851475616104452 operation, and raising temperature to adjust flow is a common misconception; after confirming effectiveness, fix the parameters and practices into the work instruction to pr...

Injection Molding PET;pressure sensitivity;fluidity;injection pressure;misconception

Q

PET vs PP meal box selection

A

Microwave scenarios are PP's territory; PET must be clearly marked as prohibited; 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 fu...

Processing Machinery PETPPmicrowavemeal box

Q

PET vs PC bottle selection

A

Reusable containers require PC-level toughness; PET is positioned for single use; 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 fu...

Processing Machinery PETPCwater barreldrop

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