Problem & Lösung

Praktische Antworten auf häufige Herausforderungen mit Kunststoffmaterialien

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Q

TPU product surface scratch

A

TPU surface scratches are related to the demolding state; the surface is not the smoother the better, and appropriate roughness is actually beneficial to demolding; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling TPU；scratch；demolding；draft；surface；cooling

Q

TPU screw slipping

A

Screw slipping is a physical feeding obstacle; feed zone temperature management is the key to preventing TPU slipping; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Processing Machinery TPU；screw slipping；feeding；bridging；feed zone；temperature

Q

TPU nozzle drool

A

Drooling both wastes raw material and introduces cold material defects; temperature and back pressure adjustment combined with an anti-drooling structure can solve it; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；nozzle；drooling；temperature；back pressure；anti-drooling

Q

TPU under-injection short shot

A

TPU short shot is troubleshooted along the three routes of feeding, temperature, and pressure; high-viscosity grades require higher filling energy; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；short shot；under-injection；melt temperature；injection pressure；feeding

Q

TPU pockmarks and shrinkage wrinkles

A

Pockmarks and shrinkage wrinkles are the appearance of imbalanced feeding compensation and temperature management; troubleshoot in the order of pressure, temperature, feeding, and gate; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；pockmark；shrinkage wrinkle；injection pressure；mold temperature；gate

Q

TPU product dents and sink marks

A

TPU sink marks are adjusted along the two lines of feeding compensation and temperature; structural uniformity is the fundamental solution for thick-walled parts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；dent；sink mark；feeding compensation；injection pressure；venting

Q

TPU burrs and flash

A

TPU low-viscosity melt is sensitive to parting line precision; dual reduction of temperature and pressure usually takes effect quickly; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；burr；flash；injection pressure；clamping force；temperature

Q

TPU product mold sticking

A

Mold sticking is one of the most common TPU problems; TPU itself is highly sticky, and only systematic troubleshooting of the three aspects of pressure, mold temperature, and mold surface can cure it; after confirming effectiveness, fix the parameters and practices into the work instruction to pr...

Injection Molding TPU；mold sticking；demolding；injection pressure；mold temperature；mold surface

Q

TPU reduced toughness and brittleness

A

TPU toughness decline is mostly related to hydrolysis; moisture control is fundamental to maintaining polyurethane performance, and the recycled material ratio must be strictly limited; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying TPU；toughness；hydrolysis；recycled material；molecular weight；strength

Q

TPU scorch marks and burnt

A

For TPU scorch marks, suspect shear overheating first; compared with SEBS-based TPE, TPU is more sensitive to shear, and speed control is the first means of preventing scorching; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding TPU；scorch mark；burnt；shear heat；injection speed；venting

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