Problem & Solution

Practical answers to common plastic material challenges

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Q

TPU extrusion melt fracture

A

Melt fracture is a manifestation of shear instability; temperature and gap adjustment can alleviate it; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for simi...

Extrusion & Post TPU；extrusion；melt fracture；sharkskin；die；shear

Q

TPU extrusion surface roughness

A

TPU extrusion surface quality relies on temperature and die condition management; buildup cleaning is a routine maintenance item; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post TPU；extrusion；surface roughness；die；temperature；buildup

Q

Processing differences between TPU and SEBS-based TPE

A

The processing characteristics of TPU and SEBS-based TPE differ significantly; moisture and shear sensitivity are the two starting points of TPU process design; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying TPU；SEBS；processing difference；moisture；shear；process

Q

TPU multi-hardness material switching

A

TPU grade switching requires re-calibration of the process; hardness is the core variable affecting processability; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling TPU；hardness；material change；temperature window；process card；cleaning

Q

TPU recycled material use problems

A

TPU recycled material must be limited in quantity and use; re-drying is a necessary step before use; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Processing Machinery TPU；recycled material；ratio；drying；performance；management

Q

TPU hydrolysis degradation

A

TPU hydrolysis is permanent damage; prevention outweighs remedy, and damp material is not recommended for high-performance products; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying TPU；hydrolysis；degradation；molecular weight；drying；storage

Q

TPU secondary moisture absorption after drying

A

TPU moisture management is a whole-process problem; exposure control after drying is as important as drying itself; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying TPU；secondary moisture absorption；drying；exposure time；closed conveying；hopper

Q

TPU weld line low strength

A

TPU weld lines are difficult to completely eliminate; design avoidance of stressed areas is more reliable than process remedies; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Processing Machinery TPU；weld line；strength；gate；front temperature；overflow well

Q

TPU flow marks

A

TPU flow marks are improved by smooth filling and uniform mold temperature; speed profile optimization is the main means; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling TPU；flow mark；filling；mold temperature；speed；gate

Q

TPU product haze and transparency loss

A

The haze of transparent TPU is sensitive to process fluctuations; temperature and moisture management guarantee transparency; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying TPU；haze；transparent；degradation；additive；cooling

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All Topics 11636 Material Drying 1439 Injection Molding 1506 Molding Process 740 Molds & Tooling 1506 Processing Machinery 2025 Extrusion & Post 2239 Blow Molding 315 Thermoforming 141 Material Analysis 1343 Production & Quality 382