Problem & Solution

Practical answers to common plastic material challenges

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Q

PET sheet transverse streaks

A

PET sheet transverse lines point to roll system speed accuracy; upgrading the speed regulation system can cure such periodic defects better than adjusting the process; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post PET;sheet;transverse lines;three rolls;speed regulation accuracy

Q

PET sheet inter-roll bank

A

The inter-roll bank is the compaction guarantee of PET calendering; without a bank, water marks are inevitable; uniform bank rotation is the operator's visual standard; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post PET;sheet;orange peel mark;inter-roll bank;calendering

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 recycled textile

A

rPET spinning requires raw material grading plus process adaptation; 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

Extrusion & Post PETrPETspinningdyeing

Q

PET industrial yarn

A

Tire cord is a dedicated route of high-viscosity chips plus high-ratio drawing; 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

Extrusion & Post PETtire cordhigh viscosityheat setting

Q

PET staple fiber

A

Staple fiber uniformity relies on process stability and online monitoring; 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

Extrusion & Post PETstaple fiberstrengthCV value

Q

PET BOPET film

A

BOPET film breakage relies on cast sheet quality and stretching window control; 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

Extrusion & Post PETBOPETstretchingfilm breakage

Q

PET film biaxial stretching

A

BOPET's stretching window is built on cast sheet quality; uniform crystallization is the prerequisite for high-speed stable stretching; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post PET；BOPET；biaxial stretching；cast sheet；corona

Q

PET wide-mouth bottle preform

A

The bottle finish is the functional vital point of a wide-mouth bottle; dual control of crystallinity and dimensions holds the bottom line of sealing; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post PET；wide-mouth bottle；bottle finish crystallization；sealing；thread

Q

PET cosmetic bottle

A

Pearlescent white haze is a sign of insufficient PET orientation; matching adjustment of temperature and stretching is the key process for the appearance of high-end bottles; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post PET；cosmetic bottle；pearlescence；stress whitening；stretching

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